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49 results on '"L. S. Moreira"'

1. Material and geometric nonlinear analysis of reinforced concrete frames

Author: E. Parente Jr, G. V. Nogueira, M. Meireles Neto, and L. S. Moreira
Subjects: concrete structures, nonlinear analysis, plane frames, finite element method, Building construction, TH1-9745
Abstract: The analysis of reinforced concrete structures until failure requires the consideration of geometric and material nonlinearities. However, nonlinear analysis is much more complex and costly than linear analysis. In order to obtain a computationally efficient approach to nonlinear analysis of reinforced concrete structures, this work presents the formulation of a nonlinear plane frame element. Geometric nonlinearity is considered using the co-rotational approach and material nonlinearity is included using appropriate constitutive relations for concrete and steel. The integration of stress resultants and tangent constitutive matrix is carried out by the automatic subdivision of the cross-section and the application of the Gauss quadrature in each subdivision. The formulation and computational implementation are validated using experimental results available in the literature. Excellent results were obtained.
Published: 2014

2. Material and geometric nonlinear analysis of reinforced concrete frames

Author: E. Parente Jr, G. V. Nogueira, M. Meireles Neto, and L. S. Moreira
Subjects: concrete structures, nonlinear analysis, plane frames, finite element method, Building construction, TH1-9745
Abstract: The analysis of reinforced concrete structures until failure requires the consideration of geometric and material nonlinearities. However, nonlinear analysis is much more complex and costly than linear analysis. In order to obtain a computationally efficient approach to nonlinear analysis of reinforced concrete structures, this work presents the formulation of a nonlinear plane frame element. Geometric nonlinearity is considered using the co-rotational approach and material nonlinearity is included using appropriate constitutive relations for concrete and steel. The integration of stress resultants and tangent constitutive matrix is carried out by the automatic subdivision of the cross-section and the application of the Gauss quadrature in each subdivision. The formulation and computational implementation are validated using experimental results available in the literature. Excellent results were obtained.
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3. On the Transient Atomic/Heat Diffusion in Cylinders and Spheres with Phase Change: A Method to Derive Closed-Form Solutions

Author: I. L. Ferreira, A. Garcia, and A. L. S. Moreira
Subjects: Mathematics, QA1-939
Abstract: Analytical solutions for the transient single-phase and two-phase inward solid-state diffusion and solidification applied to the radial cylindrical and spherical geometries are proposed. Both solutions are developed from the differential equation that treats these phenomena in Cartesian coordinates, which are modified by geometric correlations and suitable changes of variables to achieve closed-form solutions. The modified differential equations are solved by using two well-known closed-form solutions based on the error function, and then equations are obtained to analyze the diffusion interface position as a function of time and position in cylinders and spheres. These exact correlations are inserted into the closed-form solutions for the slab and are used to update the roots for each radial position of the moving boundary interface. The predictions provided by the proposed analytical solutions are validated against the results of a numerical approach. Finally, a comparative study of diffusion in slabs, cylinders, and spheres is also presented for single-phase and two-phase solid-state diffusion and solidification, which shows the importance of the effects imposed by the radial cylindrical and spherical curvatures with respect to the Cartesian coordinate system in the process kinetics. The analytical model is proved to be general, as far as, a semi-infinite solution for diffusion problems with phase change exists in the form of the error function, which enables exact closed-form analytical solutions to be derived, by updating the root at each radial position the moving boundary interface.
Published: 2021
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4. On the Continuous Mechanics First and Second-Order Formulations for Nonequilibrium Nucleation: Derivation and Applications

Author: I. L. Ferreira and A. L. S. Moreira
Subjects: Condensed Matter Physics
Abstract: Nucleation and growth are phenomena that can be applied to several fields of science and technology. On the other hand, nucleation depends on the cooling rate, dislocating the equilibrium, as surface energy depends on the created and deformed surface area. The crystalline/glassy transition limit dependence on the thermal gradient is also analyzed. In this paper, under the continuum mechanics, first- and second-order non-equilibrium nucleation formulation models are derived, and a phase-change moving interface is considering the thermal field. Nucleation important variables will be plotted against the cooling rate for several nucleation angles. It will be coupled with a theoretical model for the molar-specific heat capacity of solids to analyze its dependence on nucleation kinetics.
Published: 2023

5. Closed-form solution for the inward unsteady-state solidification of cylinders and spheres: pure metals and eutectics

Author: I. L. Ferreira, A. Garcia, and A. L. S. Moreira
Subjects: Physical and Theoretical Chemistry, Condensed Matter Physics
Published: 2022

6. On the Multiscale Formulation and the Derivation of Phase-Change Moving Interfaces

Author: I. L. Ferreira, A. Garcia, and A. L. S. Moreira
Subjects: Condensed Matter Physics
Published: 2022

7. Implementação de um sistema para auxílio na coleta dos resíduos sólidos urbanos

Author: Igor de A. Lima, Lucas H. F. Pavão, Lilian B. B. Gomes, Mateus H. S. Ferraz, Aldo T. M. Sales, Anderson L. S. Moreira, and Marco A. O. Domingues
Abstract: O crescimento significativo do número de sistemas embarcados– principalmente inseridos em um ambiente contextualizado pelo paradigma tecnológico da Internet das Coisas (IoT) – tem sido responsável por uma geração massiva de dados detentores de uma capacidade intrínseca de produção de valor. A atualização crescente destes sistemas tem sido utilizada nas mais diversas áreas do conhecimento, entre elas a de gestão ambiental. O presente artigo mostra a implementação um sistema de coleta de resíduos urbano, denominado SiCOL (Sistema de Coleta de Lixo Inteligente), que foi desenvolvido e aprimorado no IFPE/Campus Recife em parceria com a UFPE, nos conceitos da IoT, para melhoria do sistema de coleta sanitária do lixo urbano nos campi citados.
Published: 2022

8. Uso de IoT para auxiliar na coleta de lixo urbano

Author: Igor de A. Lima, Aldo T. Sales, Marco A. O. Domingues, and Anderson L. S. Moreira
Abstract: O crescimento significativo do número de sistemas embarcados principalmente inseridos em um ambiente contextualizado pelo paradigma tecnológico da Internet das Coisas (IoT) – tem sido responsável por uma geração massiva de dados detentores de uma capacidade intrínseca de produção de valor. A atualização crescente destes sistemas tem sido utilizada nas mais diversas áreas do conhecimento, entre elas a de gestão ambiental. O presente artigo mostra a implementação um sistema de coleta de resíduos urbano, denominado SiCOL (Sistema de Coleta de Lixo Inteligente), que foi desenvolvido e aprimorado no IFPE/Campus Recife em parceria com a UFPE, nos conceitos da IoT, para melhoria do sistema de coleta sanitária do lixo urbano nos campi citados.
Published: 2022

9. A Cassação da Inscrição Estadual do Contribuinte de ICMS: aspectos constitucionais e legislação do Estado de São Paulo

Author: C. L. S. MOREIRA
Published: 2022

10. Dust arriving in the Amazon basin over the past 7,500 years came from diverse sources

Author: Cybelli G. G. Barbosa, Juliana Silva Nogueira, M. H. Shimizu, Gabriel Martins, Renato Campello Cordeiro, Abdelfettah Sifeddine, Gilberto da Silva Vaz, Ricardo H. M. Godoi, Heitor Evangelista, Carla Cristine Aguiar Neto, L. S. Moreira, Bruno Turcq, Keila Aniceto, Claudio de Morisson Valeriano, Artur Cezar Bastos Neto, State University of Rio de Janeiro, Variabilité à long terme du climat de l'océan (VALCO), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU), Fluminense Federal University [Niterói], Federal University of Amazonas, Universidade La Salle [Canoas, Brasil], Federal University of Paraná, Center for Weather Forecasting and Climate Studies [São Paulo] (CPTEC), Instituto Nacional de Pesquisas Espaciais (INPE), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Subjects: 010504 meteorology & atmospheric sciences, Amazon rainforest, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], Rainforest, 15. Life on land, Mineral dust, Before Present, 010502 geochemistry & geophysics, 01 natural sciences, Arid, Geography, 13. Climate action, [SDU]Sciences of the Universe [physics], Period (geology), General Earth and Planetary Sciences, Satellite imagery, Physical geography, Holocene, 0105 earth and related environmental sciences, General Environmental Science
Abstract: A large amount of dust from the Sahara reaches the Amazon Basin, as observed with satellite imagery. This dust is thought to carry micronutrients that could help fertilize the rainforest. However, considering different atmospheric transport conditions, different aridity levels in South America and Africa and active volcanism, it is not clear if the same pathways for dust have occurred throughout the Holocene. Here we present analyses of Sr-Nd isotopic ratios of a lacustrine sediment core from remote Lake Pata in the Amazon region that encompasses the past 7,500 years before present, and compare these ratios to dust signatures from a variety of sources. We find that dust reaching the western Amazon region during the study period had diverse origins, including the Andean region and northern and southern Africa. We suggest that the Sahara Desert was not the dominant source of dust throughout the vast Amazon basin over the past 7,500 years. Mineral dust deposited over the western Amazon region through the Holocene is not limited to a Saharan source and instead has diverse origins, according to geochemical fingerprinting of dust from lacustrine deposits.
Published: 2021

11. Bulk, isotopic, petrographic organic matter and mineral distribution as proxies of environmental process in Guanabara Bay, SE, Brazil

Author: Renato Campello Cordeiro, Wilson Machado, M. F. G. Meniconi, D. D. dos Santos, Alex Figueiredo, Ricardo Erthal Santelli, and L. S. Moreira
Subjects: chemistry.chemical_classification, Total organic carbon, geography, geography.geographical_feature_category, δ13C, Drainage basin, Estuary, Environmental Science (miscellaneous), Geotechnical Engineering and Engineering Geology, Oceanography, Productivity (ecology), chemistry, Environmental chemistry, Earth and Planetary Sciences (miscellaneous), Organic matter, Mangrove, Bay, Geology
Abstract: Guanabara Bay is an estuarine environment of great socio-economic importance, where around 12 million people live in its drainage basin. We aim to characterize the sedimentary matter of Guanabara Bay, two mangrove systems therein (Surui and Piedade mangroves), and the rivers, Sao Joao do Meriti, Iguacu, Sarapui, Surui, and Guapimirim, by performing sedimentological, mineralogical, elemental/isotopic organic matter composition (total organic carbon and total nitrogen, 13C and 15 N) and organic matter petrography. Samples from the entrance of the bay present high values of quartz, low values of C/N ratio, and high percentages of diffuse amorphous organic matter indicating marine influence, whereas samples from rivers mouths present high percentages of translucent lignocellulosic, opaque lignocellulosic, gelified organic matter, and high C/N ratio probably due to the influence of terrestrial organic matter that comes from the drainage basin and the mangroves areas. Stations of the central sector of the bay were characterized by high percentages of TOC, intermediated values of δ13C, low C/N ratio, and also high diffuse amorphous organic matter indicating a predominant influence of organic matter from algae origin. High values of δ15N indicate large assimilation of nitrate or a high denitrification process in the highest productivity areas. In the river mouth regions, it is mainly influenced by terrestrial organic matter; however, in the northwestern and western sectors, organic matter is influenced both by terrestrial and domestic sewage influences which promote anaerobic decomposition of organic matter.
Published: 2021

12. Limnological response to climatic changes in western Amazonia over the last millennium

Author: Gabriel Martins, L. S. Moreira, Renato Campello Cordeiro, Grace Peters-Schulze, Majoi de Novaes Nascimento, Mark B. Bush, and Bruno Turcq
Subjects: Global and Planetary Change, geography.geographical_feature_category, Ecology, biology, Amazon rainforest, Amazonian, Glacier, Vegetation, biology.organism_classification, Geography, Diatom, Organic geochemistry, Sedimentary rock, Precipitation, Physical geography, Ecology, Evolution, Behavior and Systematics
Abstract: The Little Ice Age (LIA - A.D. 1400 to 1820, 550 to 130 cal yr BP) was a significant worldwide climatic fluctuation, yet little is known about its impact on the ecology of Amazonia or its human inhabitants. Using organic geochemistry and diatoms, we investigate the limnological impact of this event in an Amazonian record spanning the last 760 years. The sedimentary record is from Lake Pata (Lagoa da Pata), which lies on the Hill of Six Lakes (Morro dos Seis Lagos), in the wettest section of the western Brazilian Amazonia. We found that many of the diatom taxa recovered from this remote site are either morphotypes of known species or species new to science. Eunotia and Frustulia dominated our fossil diatom assemblage over time, indicating oligotrophic waters of low pH. The limnological characteristics of this pristine system changed very little over the last millennium, except for a slight intensification of precipitation indicated by the increase in Aulacoseira granulata abundances, in C/N ratios, and in sedimentation rates. This phase lasted from 1190 to 1400 A.D. (760 to 550 cal yr BP). Although occurring before the onset of LIA, the observed change matched increases in precipitation observed in Venezuelan glaciers and Peruvian speleothems. We conclude that although the changes in precipitation detected in our lake match the timing of precipitation increase in some South American records, the event was shorter and its effects in this region of Amazonia were mild compared with other regional records. Our paleolimnological data provide additional insights into the interpretation of a remarkably stable fossil pollen record, in that the highest variance in vegetation occurred over the last millennium. Because Lake Pata has no human influence, part of its value is in providing a reference, with which variability in other settings that do have a human history, can be compared.
Published: 2021

13. Vegetation response to climatic changes in western Amazonia over the last 7,600 years

Author: Renato Campello Cordeiro, Gabriel Martins, L. S. Moreira, Mark B. Bush, Majoi de Novaes Nascimento, Bruno Turcq, Florida Institute of Technology [Melbourne], Fluminense Federal University [Niterói], Variabilité à long terme du climat de l'océan (VALCO), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
Subjects: 010506 paleontology, 010504 meteorology & atmospheric sciences, mid-Holocene dry event, Climate change, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], drought, medicine.disease_cause, 01 natural sciences, Pollen, medicine, Resilience (network), resilience, ComputingMilieux_MISCELLANEOUS, Ecology, Evolution, Behavior and Systematics, geochemistry, 0105 earth and related environmental sciences, Ecology, Amazon rainforest, Palaeoecology, 15. Life on land, Vegetation response, climate change, 13. Climate action, pollen, Paleoecology, Environmental science
Abstract: International audience
Published: 2019

14. Climate and hydrologic controls on late Holocene sediment supply to an Amazon floodplain lake

Author: Anna Paula Soares Cruz, Keila Aniceto, Manuel Moreira-Ramírez, Bruno Turcq, L. S. Moreira, Renato Campello Cordeiro, Patricia Moreira-Turcq, Vanessa Cunha Silva, Sandrine Caquineau, Departamento de Geoquimica (DEPARTAMENTO DE GEOQUIMICA), Universidade Federal do Rio de Janeiro (UFRJ), Géosciences Environnement Toulouse (GET), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Variabilité à long terme du climat de l'océan (VALCO), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Universidade Federal do Amazonas, California State University [Bakersfield] (CSUB), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)
Subjects: 0106 biological sciences, Total organic carbon, chemistry.chemical_classification, Hydrology, 010506 paleontology, geography, geography.geographical_feature_category, Floodplain, 010604 marine biology & hydrobiology, Sediment, Fluvial, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], 15. Life on land, Aquatic Science, 01 natural sciences, chemistry, 13. Climate action, Environmental science, Organic matter, Levee, Channel (geography), Holocene, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, Earth-Surface Processes
Abstract: Organic and inorganic geochemical analyses on sediments from Preto Lake, a central Amazon basin floodplain water body, were used to document hydrological changes of the Solimoes River during the late Holocene. Between 3600 and 400 cal yr BP, Preto Lake received smectite-rich sediment from the Solimoes River, with high concentrations of Al (~ 53 × 103 ppm) and Si (~ 210 × 103 ppm). The high detrital input suggests there was a direct connection between Preto Lake and the main river channel. High river inflow maintained lake stage and was responsible for the contribution to sediments of phytoplankton-derived organic matter. Low sediment organic carbon concentrations characterized this period (mean ~ 3.8 wt%), probably because of dilution by river-borne lithogenic matter. Although the river inputs remained high, abrupt increases in TOC content around 1800 and 1200 cal yr BP suggest brief increases in fluvial nutrient supply to Preto Lake. During the last 400 cal yr, substantial declines in smectite (mean 40%), Al (~ 29 × 103 ppm) and Si (138 × 103 ppm) suggest the establishment of a semi-isolated lake, with reduced river inflow. A large proportion of C3-plant-derived organic matter, supplied by runoff from the kaolinite-rich watershed, was observed during this period, and was accompanied by high autochthonous primary production, driven by development of an aquatic macrophyte community. This change in sediment organic matter source accounted for the greater TOC content (~ 20%) of sediments deposited during this period. Although Holocene climate change was an important control on fluvial sediment supply to upper and lower Amazon Basin floodplain lakes, sedimentation processes in Preto Lake can also be linked to changes in the river’s course. The transition to a semi-isolated lake could have been a consequence of lateral and vertical sediment accretion, which formed a natural levee that blocked fluvial input to Preto Lake.
Published: 2020

15. Environmental and anthropic variabilities at Guanabara Bay (Brazil): A comparative perspective of metal depositions in different time scales during the last 5,500 yrs

Author: L.C. Anjos, Edison Dausacker Bidone, L. S. Moreira, Renato Campello Cordeiro, Ricardo Erthal Santelli, R.S. Pereira, M. F. G. Meniconi, Fabio F. Monteiro, and Alex Figueiredo
Subjects: Geologic Sediments, Environmental Engineering, Health, Toxicology and Mutagenesis, 0208 environmental biotechnology, Drainage basin, Weathering, 02 engineering and technology, 010501 environmental sciences, 01 natural sciences, Metals, Heavy, Environmental Chemistry, Humans, Holocene, 0105 earth and related environmental sciences, geography, geography.geographical_feature_category, Public Health, Environmental and Occupational Health, Sediment, General Medicine, General Chemistry, Pollution, 020801 environmental engineering, Bays, Environmental chemistry, Period (geology), Environmental science, Bay, Brazil, Water Pollutants, Chemical, Marine transgression, Chronology, Environmental Monitoring
Abstract: The determination of age-dated metal sediment accumulation rates in a representative South American bay is able to portray the dimension of human impacts during the colonial occupation and industrial periods. Many studies have assessed metal distribution and chronology at Guanabara Bay, in Brazil. However, understanding natural variabilities associated to paleoclimatic changes and comparing these natural variabilities to anthropogenic processes are not well established to date. Accurate geochronological control integrating ages determined by 210Pb and 14C chronologies through an exponential spline fit model allowed for a precise definition of changes associated to the holocene marine transgression, as well as the colonial period, leading to intense land use changes, and the industrial period. The reference values of the system were defined based on their concentrations and the accumulation rates of ecotoxicologically important metals. Al, Ba, Fe, Cd, Cu, Cr, Li, Ni, Mn, Pb, Si, Ti, V, and Zn distributions were determined in a Guanabara Bay core (BG-28) by the EPA 3051 method. Elemental distribution profile assessment allowed for the identification of variabilities associated to weathering processes, predominantly of lithogenic origin, mainly for Al, Ba, Fe, Li, Si, and V. Weathering processes occurred simultaneously to land use changes in the drainage basin since the colonial period, at 400 cal yr BP, and during the industrial period, mainly after the 1960s, denoted by Cd, Cr, Cu, Mn, Pb and Zn increases. The highest average metal enrichment values metals associated to industrial processes reached 5.95, with 119.1-fold higher accumulation rates than the background accumulation values observed between 4200 and 500 cal yr BP.
Published: 2020

16. Hydrocarbon sedimentary organic matter composition from different water-type floodplain lakes in the Brazilian Amazon

Author: Renato Campello Cordeiro, Gabriela Vanini, L. S. Moreira, Humberto Marotta, Vinícius B. Pereira, Alexander A. Lopes, Leonardo Amora-Nogueira, and Débora A. Azevedo
Subjects: geography, geography.geographical_feature_category, Floodplain, Productivity (ecology), δ13C, Geochemistry and Petrology, Terrigenous sediment, Environmental chemistry, Sedimentary organic matter, Environmental science, Sedimentary rock, Sedimentation, Anoxic waters
Abstract: Amazon rivers and flooded areas can be categorized into three types of water: white, black, and clear. These categories present unique physical–chemical characteristics that influence the characteristics and distribution of sedimentary organic matter (SOM). A geochemical assessment of the short sedimentary cores of four floodplain lakes within the Brazilian Amazon basin was performed. Two black, one white, and one clear-water floodplain lakes were selected to evaluate the variability of OM composition based on aliphatic biomarker and carbon isotopic ratios, as proxies for an enhanced methane cycle, anoxia, and to determine the origin of predominant aliphatic biomass. Gas chromatography was coupled to flame ionization detection (GC–FID), mass spectrometry (GC–MS) and combustion-isotope ratio mass spectrometry (GC–C–IRMS). These were used to determine aliphatic biomarker ratios, for quantification, and to measure carbon isotopic compositions. The TOC content was inversely proportional to the expected OM productivity; one black water (low OM productivity) presented the highest TOC content, and white water (high productivity) presented the lowest. Also, clear water lake (intermediate productivity) presented TOC content between the other lakes. Based on n-alkane proxies and profiles, as well as bacterial and plant-derivative terpene distribution, we observed a mostly terrigenous contribution for the black and clear water lakes (allochthonous SOM), as well as a prevalence of aquatic organisms in white water lake (autochthonous SOM). Only in the most superficial section of the white water lake, was intense OM degradation substantiated with n-alkanes showing an even-short-chain predominance, indicative of OM cycling. Also, for one black water lake, we detected depleted n-alkane and diploptene δ13C values (–42‰) associated with methanotrophic archaea and higher relative concentrations of des-A-triterpenes commonly associated with anoxic sedimentation. Based on these data, the influence of water-type on the SOM composition was verified. The approach helps to understand the application of n-alkane proxies to differentiate Amazonian environments.
Published: 2021

17. New bacterial and archaeal lineages discovered in organic rich sediments of a large tropical Bay

Author: Cristiane C. Thompson, Koko Otsuki, Renato Campello Cordeiro, L. S. Moreira, Diogo A. Tschoeke, Larissa Borges Nascimento, Carlos Eduardo de Rezende, Gizele D. Garcia, Felipe H. Coutinho, Luciana Leomil, Leandro Candeia dos Anjos, Giselle S. Cavalcanti, Bruno S. Silva, and Fabiano L. Thompson
Subjects: 0106 biological sciences, Geologic Sediments, Aquatic Science, Desulfurococcales, Mbsf, 010603 evolutionary biology, 01 natural sciences, 03 medical and health sciences, Sulfurimonas, Botany, Genetics, Phylogeny, 030304 developmental biology, 0303 health sciences, Bacteria, biology, Microbiota, biology.organism_classification, Archaea, Bays, Metagenomics, Anaerobic oxidation of methane, Methanosarcinales, Metagenome, Methanomicrobiales, Brazil, Acidobacteria
Abstract: The nutrient and oxygen gradient present in marine sediments promotes high levels of microbial diversity. We applied metagenomics and biogeochemical tools to analyze microbial communities in different sediment depths (0–4 m below sea floor, mbsf) from Guanabara Bay, Brazil, a brackish tropical ecosystem with a history of massive anthropogenic impacts, and a largely unknown sediment microbial diversity. Methanogens (e.g. Methanosarcinales, Methanomicrobiales) were more abundant at 1 mbsf, while sulphate-reducing microbes (Desulfurococcales, Thermoprotales, and Sulfolobales) were more abundant at deeper layers (4 mbsf; corresponding to 3 K Radiocarbon years before present, Holocene Epoch). Taxonomic analyzes and functional gene identification associated with anaerobic methane oxidation (e.g. monomethylamine methyltransferase (mtmB), trimethylamine methyltransferase (mttB) and CO dehydrogenase/acetyl-CoA synthase delta subunit) and sulfate reduction indicated the dominance of Campylobacteria (Sulfurimonas) at deeper sediment layers. Gene sequences related to assimilation of inorganic sulfur increased with depth, while organic sulfur related sequences decrease, accompanying the clear reduction in the concentration of sulfur, organic carbon and chla torwards deeper layers. Analyzes of metagenome assembled genomes also led to the discovery of a novel order within the phylum Acidobacteriota, named Guanabacteria. This novel order had several in silico phenotyping features that differentiate it from closely related phylogenetic neighbors (e.g. Acidobacteria, Aminicenantes, and Thermoanaerobaculum), including several genes (carbon monoxide dehydrogenase, CO dehydrogenase/CO-methylating acetyl-CoA synthase complex subunit beta, heterodisulfide reductase, sulfite exporter TauE/SafE family protein, sulfurtransferase) that relevant for the S and C cycles. Furthermore, the recovered Bathyarchaeota genome SS9 illustrates the methanogenic potential in deeper sediment layer.
Published: 2020

18. Heteronuclear molecules from matrix isolation sublimation and atomic diffusion

Author: C. Lenz Cesar, R. L. Sacramento, Wania Wolff, L. S. Moreira, A. N. Oliveira, and L. O. A. Azevedo
Subjects: Laser ablation, Matrix isolation, General Physics and Astronomy, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Molecular physics, Atomic diffusion, Heteronuclear molecule, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Sublimation (phase transition), Physical and Theoretical Chemistry, 010306 general physics, 0210 nano-technology, Spectroscopy, Molecular beam, Electron ionization
Abstract: We demonstrate the production of cryogenic beams of heteronuclear molecules from the matrix isolation sublimation (MISu) technique. A sapphire mirror serves as a substrate whereupon a solid Ne matrix is grown. Atoms of Li, H, Ca, and C are implanted into the matrix via subsequent laser ablation of different solid precursors such as Ca, Li, LiH, and graphite. The matrix is sublimated into vacuum generating a cryogenic beam of Ne carrying the previously isolated neutral atomic and molecular species. A compact and low energy electron source and time-of-flight mass spectrometer was designed to fit this system at low temperature. With electron ionization time-of-flight mass spectrometry, we analyze the species coming from MISu and demonstrate the formation of heteronuclear molecules in the matrix. In this first study, we produced LiCa from the sequential implantation of Li and Ca into the matrix and some clusters of CnLim after Li and C ablation. Also from ablation of a single LiH pellet, we observed clusters of LinHm. This novel technique opens up the opportunity to generate cryogenic beams of different molecules for precision physics and chemistry studies. Laser or microwave high resolution spectroscopy of a molecular beam benefits from low translational and rovibrational temperatures and forward velocities, such as the ones produced in this technique. Toward the prospect of enhancing the molecular formation, we introduce a new method to study the atomic diffusion of Li and Ca in the Ne matrix via laser spectroscopy during sublimation. We estimate a small diffusion coefficient at 7 K, but a surprisingly linear atomic dispersion during sublimation. The method is extensive to other species and matrices.
Published: 2018

19. Dynamics of floodplain lakes in the Upper Amazon Basin during the late Holocene

Author: Bruno Turcq, Alain Crave, Renato Campello Cordeiro, Pascal Fraizy, Isabel Quintana-Cobo, L. S. Moreira, María A. Duarte, Patricia Moreira, Keila Aniceto, Géosciences Environnement Toulouse (GET), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), Departamento de Geoquímica, Universidade Federal Fluminense [Rio de Janeiro] (UFF), Géosciences Rennes (GR), Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), IRD Lima, Biogéochimie-Traceurs-Paléoclimat (BTP), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), SO-Hybam Research Program IRD Federal Fluminense University (UFF), Brazil., INSU Paleo2–PASCAL project (Past Climate Change Impacts on Carbon Accumulation in Amazonia Floodplain Lakes (2010–2012)), CAPES, Brazil, Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636))
Subjects: floodplain, bulk density, 010504 meteorology & atmospheric sciences, Floodplain, Maranon River, 010502 geochemistry & geophysics, 01 natural sciences, Abrupt accumulation events, Deposition (geology), Lake sedimentation, Sedimentary depositional environment, Peru, [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology, Holocene, 0105 earth and related environmental sciences, Amazon Basin, depositional environment, grain size, Global and Planetary Change, geography, geography.geographical_feature_category, lake dynamics, purl.org/pe-repo/ocde/ford#1.05.00 [https], Ucayali River, Sediment, 15. Life on land, Upper Amazon Basin, Late Holocene, sediment core, 13. Climate action, Moringa, Meander, General Earth and Planetary Sciences, Physical geography, sedimentation, total organic carbon, Levee, Geology, Channel (geography)
Abstract: International audience; To better understand the impact of channel migration processes and climate change on the depositional dynamics of floodplain lakes of the upper Amazon Basin during the late Holocene, we collected three sediment cores from floodplain lakes of the Ucayali River and one from the Marañón River. The cores were dated with 14C, radiographed and described. Bulk density, grain size analysis and total organic carbon (TOC) were determined. The results show that sedimentation in Ucayali floodplain lakes was marked by variations during the late Holocene, with periods of intense hydrodynamic energy and abrupt accumulations, a gap in the record between about 2870 and 690 cal yr BP, and periods of more lacustrine conditions. These changes in sedimentation were associated with variations in the river's influence related to changes in its meandering course (2870 cal yr BP) and a period of severe flooding between 3550 and 3000 cal yr BP. Lake Lagarto on the Marañón River floodplain exhibits a different sedimentary environment of low hydrodynamics with palm trees and macrophytes. Apparently, the lake has not experienced intense migration processes during the last 600 cal yr BP (base of the core). Nevertheless, the river sediment flux to the lake was important from 600 to 500 cal yr BP, although it decreased thereafter until the present. This decrease in the mineral accumulation rate indicates a decrease in river discharge since 500 cal yr BP, which coincides with precipitation records from the central Andes. In the upper part of the three Ucayali floodplain cores, a 30- to 250-cm-thick layer of reworked sediments has been deposited since 1950 AD (post-bomb). In Lake Carmen, this layer is associated with invasion of the lake by the levee of a migrating meander of the Ucayali. In Lakes Hubos and La Moringa, however, the river is still far away and the deposition must be interpreted as the result of extreme flooding. The beginning of the Ucayali meander migration is dated back to 2000 AD, suggesting that these extreme floods could be very recent and linked to hydrologic extremes registered instrumentally in the Amazon Basin.
Published: 2018

20. Forest stability during the early and late Holocene in the igapó floodplains of the Rio Negro, northwestern Brazil

Author: Hermann Behling, Paula A. Rodríguez-Zorro, L. S. Moreira, Bruno Turcq, Crystal N. H. McMichael, Renato Campello Cordeiro, Renata Lima Costa, and Ecosystem and Landscape Dynamics (IBED, FNWI)
Subjects: Water resources, Myrsine, paleoenvironment, 010504 meteorology & atmospheric sciences, Myrtaceae, Igapó forest, 01 natural sciences, paleoecology, taxonomy, Convergence of numerical methods, purl.org/pe-repo/ocde/ford#1.05.03 [https], Human disturbances, Holocene, geography.geographical_feature_category, biology, Amazon rainforest, Forestry, Vegetation, Fire, Astrocaryum, Charcoal, Eschweilera, Pioneer species, Stability, Geology, Brazil, forest fire, 010506 paleontology, Floodplain, Hedyosmum, purl.org/pe-repo/ocde/ford#1.05.08 [https], Fires, Arts and Humanities (miscellaneous), Black-water river, Rivers, Black water, Vismia, Amazon, vegetation history, 0105 earth and related environmental sciences, Earth-Surface Processes, Amazon Basin, Macrolobium, geography, Holocenes, Swartzia, Igapo forest, Forest stability, human activity, 15. Life on land, biology.organism_classification, Cecropia, Floods, Lakes, General Earth and Planetary Sciences, Physical geography, Rio Negro [South America]
Abstract: Located at the northwestern part of the Amazon basin, Rio Negro is the largest black-water river in the world and is one of the poorest studied regions of the Amazon lowlands. In the middle-upper part of the Rio Negro were retrieved sediment cores form Lake Acarabixi, which were analyzed using pollen, spores, charcoal, and geochemistry. The aim of this study was to detect the influences from humans and river dynamics on the vegetation history in the region. Two main periods of vegetation and river dynamics were detected. From 10,840 to 8240 cal yr BP, the river had a direct influence into the lake. The lake had a regional input of charcoal particles, which reflected the effect of the dry Holocene period in the basin. Furthermore, highland taxa such asHedyosmumandMyrsinewere found at that time along with igapó forest species that are characteristic to tolerate extended flooding likeEschweilera,Macrolobium, Myrtaceae,Swartzia, andAstrocaryum. During the late Holocene (1600 to 650 cal yr BP), more lacustrine phases were observed. There were no drastic changes in vegetation but the presence of pioneer species likeVismiaandCecropia, along with the signal of fires, which pointed to human disturbances.
Published: 2018

21. VARIABILIDADE DE FORÇA E RELAÇÃO FORÇA/EMG DE MÚSCULOS MASTIGATÓRIOS NA TAREFA DE MORDIDA INCISIVA

Author: E. T. Palomari, L. A. Elias, L. S. Moreira, and C. M. Germer
Published: 2018

22. Implementing IoT for Development of a Low-Cost Environmental Monitoring System

Author: Anderson L. S. Moreira, Michel H. S. Nascimento, Marco A. O. Domingues, Arthur L. Castro, and Denis L. Moura
Subjects: World Wide Web, Development (topology), Computer science, business.industry, Web page, Environmental monitoring, The Internet, Technological advance, business, Internet of Things, Graphical user interface
Abstract: This paper presents a proposal for the development of a web system based on the Internet of Things (IoT) concepts, focused on the environmental monitoring and low cost. The need to carry out such a study is solidified by accelerated technological advancement and widespread concern with the alarming environmental conditions that the world presents today. In this system, groups of sensors are responsible for, through embedded systems, send the data to a server that stores them and also provides graphical interface models on a web page. The implementation of such a procedure allows for a better understanding of relevant environmental characteristics of certain locations, as well as the research for better solutions to environmental issues.
Published: 2017

23. The optical properties of river and floodplain waters in the Amazon River Basin: Implications for satellite-based measurements of suspended particulate matter

Author: Elisa Armijos, L. S. Moreira, Jean-Michel Martinez, and Raúl Espinoza-Villar
Subjects: Hydrology, geography, geography.geographical_feature_category, Mineralogy, Sediment, Particulates, Colored dissolved organic matter, Geophysics, Downwelling, Granulometry, Tributary, Environmental science, Saturation (chemistry), Absorption (electromagnetic radiation), Earth-Surface Processes
Abstract: Satellite images can now be used to assess river sediment discharge, and systematic studies over rivers and lakes are required to support such applications and document the variability of inland water optical properties at the watershed scale. The optical properties of the Amazon Basin waters were analyzed from in situ measurements of the remote sensing reflectance (Rrs) at 279 stations and downwelling diffuse attenuation coefficients (Kd) at 133 stations. Measurements of the apparent optical properties, suspended particulate matter (SPM) contents, and characteristics and colored dissolved organic matter (CDOM) absorption spectra were performed during 16 cruises along the main Amazonian Rivers draining the Andes and for some tributaries. Surface-suspended sediment granulometry and mineralogy showed a stable distribution at the catchment scale, even over large distances and between tributaries. The particle number-size distribution was best described using a segmented distribution with a slope of 2.2 for the fine range (1–15 µm), and the CDOM absorption coefficient at 440 nm varied from 1.8 to 7.9 m−1. Overall, both Rrs and Kd were strongly correlated with SPM, although strong CDOM absorption limited the use of the blue spectrum. Reflectance saturation from blue to red was observed at approximately 100 g m−3, whereas the near-infrared (NIR) wavelength enabled the monitoring of the full SPM range (5–620 g m−3). In contrast, Kd showed no saturation for SPM from green to NIR, and a linear model was calculated. The use of the reflectance ratio was investigated and shown to improve the suspended sediment concentration retrieval performance.
Published: 2015

24. Paleoenvironmental dynamics in South Amazonia, Brazil, during the last 35,000 years inferred from pollen and geochemical records of Lago do Saci

Author: L. S. Moreira, Gabriel Martins, Renato de Aragão Ribeiro Rodrigues, Renato Campello Cordeiro, Hermann Behling, A. Sifeddine, José Carlos Sícoli Seoane, D. Fontes, Bruno Turcq, Universidade Federal Fluminense [Rio de Janeiro] (UFF), LMI 'PALEOTRACES', IRD-UFF- Univ. of Antofagasta Chile, Palynology and Climate Dynamics, Albrecht-von-Haller-Institute for Plant Sciences, Biogéochimie-Traceurs-Paléoclimat (BTP), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Universidade Federal do Rio de Janeiro (UFRJ), Empresa Brasileira de Pesquisa Agropecuária (Embrapa), Ministério da Agricultura, Pecuária e Abastecimento [Brasil] (MAPA), Governo do Brasil-Governo do Brasil, LMI PALAEOTRACE and CNPq-IRD project PRI, Belmont Forum and JPI Climate ANR PACMEDY project, ANR-10-BLAN-0608,ELPASO,El-Niño : leçons du passé à partir de simulations et d'observations(2010), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636))
Subjects: 010506 paleontology, Archeology, Podocarpus, 010504 meteorology & atmospheric sciences, Mauritia, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], Rainforest, 01 natural sciences, Celtis, Ecology, Evolution, Behavior and Systematics, Holocene, 0105 earth and related environmental sciences, Palynology, Global and Planetary Change, biology, Amazon rainforest, Ecology, Last glacial maximum, Geology, Last Glacial Maximum, 15. Life on land, biology.organism_classification, Paleoenvironment, Geochemical proxies, 13. Climate action, Pollen, South Amazonia
Abstract: International audience; Paleoenvironmental changes for the last 35,000 years were reconstructed from palynological, sedimentological and organic geochemical evidence from a well-dated sediment core from Lago do Saci (South Amazonia). Dry climatic conditions occurred between 35,000 and 18,200 cal yr BP as recorded by high frequencies of open savanna taxa and low lake level indicated by Sagittaria and low Total Organic Carbon content. Cold temperatures are indicated by the presence of Podocarpus and Ilex. A sedimentation hiatus observed between 18,200 and 9200 cal yr BP was likely related to dry conditions. The beginning of the Holocene was marked by rainforest expansion and an increase in carbon content that represented high lake levels and warmer and wetter climate conditions. Between 7500 and 5000 cal yr BP, the expansion of open savanna, seasonal forest elements and abundant black carbon suggests a dry phase. After 5000 cal yr BP, rainforest expansion and higher lake levels indicate a return to wetter conditions. A reduction of flooding taxa (Celtis and Mauritia) between 1800 and 1300 cal yr BP, high lake level conditions and maintenance of a forest physiognomy, suggests a decrease of regional precipitation and subsequent reduction of the flooded areas in a still humid climate regime.
Published: 2017

25. Biogeochemical factors controlling arsenic distribution in a densely populated tropical estuary (Guanabara Bay, RJ, Brazil)

Author: Ricardo Erthal Santelli, Aline Soares Freire, L. S. Moreira, Renato Campello Cordeiro, Wilson Machado, Bernardo Ferreira Braz, M. F. G. Meniconi, N. Rizzini-Ansari, and Edison Dausacker Bidone
Subjects: Pollution, Biogeochemical cycle, 010504 meteorology & atmospheric sciences, media_common.quotation_subject, Soil Science, chemistry.chemical_element, 010501 environmental sciences, 01 natural sciences, Environmental Chemistry, Organic matter, Arsenic, 0105 earth and related environmental sciences, Earth-Surface Processes, Water Science and Technology, media_common, chemistry.chemical_classification, Global and Planetary Change, geography, geography.geographical_feature_category, Sediment, Geology, Estuary, Deposition (aerosol physics), chemistry, Environmental chemistry, Bay
Abstract: The preferential arsenic (As) accumulation in the central sector of the Guanabara Bay (a heavily impacted coastal system located in SE Brazil) is different from most metal contaminants, which present higher concentrations at harbour areas and the rivers mouths that drain large areas with highly deficient pollution control. The estuary is characterised by organic contents and minerals gradients, which induce different redox conditions and different biogeochemical process. Elemental and isotopic analyses on bulk organic matter, mineralogical and textural analyses of sediments were conjugated with a three-step sequential extraction procedure, based on the BCR method (Community Bureau of Reference). This approach was used to evaluate the potential of arsenic mobility. The distribution of the sum of arsenic in the three fractions presented a significant positive correlation with manganese mainly in the oxidised fraction (F2), which corresponded to the most representative fraction conditioned by physicochemical processes. In the exchangeable fraction (F1), which represents the most reactive arsenic phase, this element seems to be associated with the labile organic matter. The high productivity in the central sector might result in a greater deposition of arsenic in the sediment through co-precipitation with manganese deposition in an oxidising environment. Organic matter and sulphide in reducing environments were also found to be important factors controlling the distribution and speciation of arsenic, as indicated by the oxidizable fraction (F3) data.
Published: 2017

26. Cryogenic mount for mirror and piezoelectric actuator for an optical cavity

Author: Wania Wolff, L. S. Moreira, A. N. Oliveira, V. B. Brasil, R. L. Sacramento, L. Kosulic, and C. L. Cesar
Subjects: Materials science, business.industry, media_common.quotation_subject, Emphasis (telecommunications), Inertia, 01 natural sciences, Heat capacity, Computer Science::Other, law.invention, Computer Science::Robotics, 010309 optics, law, Derating, Optical cavity, 0103 physical sciences, Thermal, Optoelectronics, 010306 general physics, business, Spectroscopy, Antihydrogen, Instrumentation, media_common
Abstract: We present the development of a mount that accommodates a mirror and a piezoelectric actuator with emphasis on physical needs for low temperature operation. The design uses a monolithic construction with flexure features that allow it to steadily hold the mirror and the piezoelectric actuator without glue and accommodate differential thermal contraction. The mount is small and lightweight, adding little heat capacity and inertia. It provides a pre-loading of the piezoelectric actuator as well as a good thermal connection to the mirror and a thermal short across the piezoelectric actuator. The performance of the assemblies has been tested by thermally cycling from room temperature down to 3 K more than a dozen times and over one hundred times to 77 K, without showing any derating. Such mounts are proposed for the cryogenic optical enhancement cavities of the ALPHA experiment at CERN for laser spectroscopy of antihydrogen and for hydrogen spectroscopy in our laboratory at UFRJ.
Published: 2017

27. Compliance trabalhista = Labor compliance

Author: Innocenti, Ricardo, Camilis, Vivian Cavalcanti Oliveira de, Martinez, Ricardo da Silva, Oliveira, Libia Alvarenga de, and Diniz, Samanta L. S. Moreira Leite
Abstract: Submitted by Tiago Carvalho (tiagosc@stj.jus.br) on 2017-05-25T14:11:05Z No. of bitstreams: 2 compliance_trabalhista_innocenti.pdf: 1503182 bytes, checksum: 86fbdb5afc619d331f580b73e2618ca1 (MD5) license.txt: 1239 bytes, checksum: c9b4c351324448672315a00808efb725 (MD5) Approved for entry into archive by Roberta Marins (rmarins@stj.jus.br) on 2017-05-25T19:35:15Z (GMT) No. of bitstreams: 2 license.txt: 1239 bytes, checksum: c9b4c351324448672315a00808efb725 (MD5) compliance_trabalhista_innocenti.pdf: 1503182 bytes, checksum: 86fbdb5afc619d331f580b73e2618ca1 (MD5) Made available in DSpace on 2017-05-25T19:35:15Z (GMT). No. of bitstreams: 2 license.txt: 1239 bytes, checksum: c9b4c351324448672315a00808efb725 (MD5) compliance_trabalhista_innocenti.pdf: 1503182 bytes, checksum: 86fbdb5afc619d331f580b73e2618ca1 (MD5) Previous issue date: 2017
Published: 2017

28. Nerolidol-loaded nanospheres prevent behavioral impairment via ameliorating Na

Author: Matheus D, Baldissera, Carine F, Souza, Thirssa H, Grando, Karen L S, Moreira, Andressa S, Schafer, Luciana F, Cossetin, Ana P T, da Silva, Marcelo L, da Veiga, Maria Izabel U M, da Rocha, Lenita M, Stefani, Aleksandro S, da Silva, and Silvia G, Monteiro
Subjects: Trypanosoma, Central Nervous System Protozoal Infections, Motor Activity, GPI-Linked Proteins, Thiobarbituric Acid Reactive Substances, Antioxidants, Mice, Memory, Trypanosomiasis, Avoidance Learning, Reaction Time, Animals, Nootropic Agents, Memory Disorders, Behavior, Animal, Superoxide Dismutase, Brain, Catalase, Disease Models, Animal, Oxidative Stress, Acetylcholinesterase, Female, Cholinesterase Inhibitors, Sodium-Potassium-Exchanging ATPase, Cognition Disorders, Reactive Oxygen Species, Sesquiterpenes, Nanospheres
Abstract: The aim of this study was to investigate the effect of nerolidol-loaded nanospheres (N-NS) on the treatment of memory impairment caused by Trypanosoma evansi in mice, as well as oxidative stress, and Na
Published: 2016

29. Reconstituição paleoambiental do Lago Santa Ninha, Várzea do Lago Grande de Curuai, Pará, Brasil

Author: Renato Campello Cordeiro, L. S. Moreira, Patricia Moreira-Turcq, and Bruno Turcq
Subjects: Total organic carbon, Amazon rainforest, Lacustrine deposits, General Agricultural and Biological Sciences, Geomorphology, Geology
Abstract: Este estudo teve por objetivo reconstituir as mudanças paleoambientais e paleohidrológicas no baixo Amazonas. Um testemunho de sedimento foi coletado no Lago Santa Ninha, na várzea do Lago Grande de Curuai, localizada na margem direita do Rio Amazonas a aproximadamente 850 km da foz. O teor de água, a granulometria, as datações com carbono 14, os conteúdos de carbono orgânico e nitrogênio total e o isótopo estável do carbono (δ13C) foram utilizados para determinar os processos sedimentares a que o meio esteve submetido. O testemunho estudado possui 270 cm de comprimento que corresponde a um período de 5600 anos cal AP. Este estudo colocou em evidência diferentes ambientes sedimentares: na base do testemunho até 4900 anos cal AP há uma vegetação inundada que foi gradualmente substituida por bancos de gramíneas e por uma planicie com secas sazonais em 4000 anos cal AP até alcançar, desde 600 anos AP as condições atuais deste lago. Estas alterações podem ter ocorrido em decorrência de mudanças no ciclo hidrológico do Rio Amazonas que, por sua vez, também são reflexos de alterações climáticas.
Published: 2009

30. ACUMULAÇÃO DE CARBONO EM LAGOS AMAZÔNICOS COMO INDICADOR DE EVENTOS PALEOCLIMÁTICOS E ANTRÓPICOS

Author: L. S. Moreira, A. Sifeddine, Rodrigo de Caravalho Rodrigues, Renato Campello Cordeiro, Bruno Turcq, Francisco Fernando Lamego Simões Filho, Renata Lima Costa, and Patricia Florio Moreira Turcq
Subjects: geography, geography.geographical_feature_category, Ecology, Amazon rainforest, Aquatic ecosystem, Atmospheric carbon cycle, Environmental science, Biota, Carbon sequestration, Sink (geography)
Abstract: CARBON ACUMULATION IN AMAZON LAKES AS INDICATORS OF ANTROPIC AND PALEOCLIMATIC EVENTS. Land biota is regarded as a natural sink for atmospheric carbon. Tropical forests have an important role in this assimilation, but little is known about the role of continental aquatic systems in the process of carbon sequestration and its relationship with paleoclimatic changes. The objective of the present article is to bring together the main studies with Amazon lakes in order to highlight the participation of aquatic systems in the local accumulation of carbon and the participation of human-made and paleoclimatic changes in the Amazon in different time scales. Three different lake systems were analysed: the lowland lakes of Santa Ninha and Acarabixi, which are respectively directly infl uenced by the hydrological cycles of Amazon and Negro rivers, and some lakes that are isolated from the effects of the dynamics of Amazon rivers (which
Published: 2008

31. Respiratory viruses in children younger than five years old with acute respiratory disease from 2001 to 2004 in Uberlândia, MG, Brazil

Author: L S Moreira, Livia Maria Gonçalves Rossi, Jonny Yokosawa, Lourenço Faria Costa, Lysa Luiz Nepomuceno, Orlando Cesar Mantese, Divina Aparecida Oliveira Queiróz, G Dyonisio, Hélio Lopes da Silveira, R. C. Oliveira, L Z G Ribeiro, and Thelma Fátima Mattos Oliveira
Subjects: Male, Microbiology (medical), lcsh:Arctic medicine. Tropical medicine, lcsh:RC955-962, viruses, lcsh:QR1-502, medicine.disease_cause, lcsh:Microbiology, Virus, children, Human metapneumovirus, respiratory viruses, Nasopharynx, medicine, Humans, immunofluorescence assay, Influenzavirus, Respiratory Tract Infections, Coronavirus, reverse transcription of polymerase chain reaction, biology, Respiratory tract infections, Incidence (epidemiology), Respiratory disease, Infant, virus diseases, biology.organism_classification, medicine.disease, respiratory disease, Virology, Child, Preschool, Acute Disease, Female, Rhinovirus, Brazil
Abstract: The main viruses involved in acute respiratory diseases among children are: respiratory syncytial virus (RSV), influenzavirus (FLU), parainfluenzavirus (PIV), adenovirus (AdV), human rhinovirus (HRV), and the human metapneumovirus (hMPV). The purpose of the present study was to identify respiratory viruses that affected children younger than five years old in Uberlândia, Midwestern Brazil. Nasopharyngeal aspirates from 379 children attended at Hospital de Clínicas (HC/UFU), from 2001 to 2004, with acute respiratory disease, were collected and tested by immunofluorescence assay (IFA) to detect RSV, FLU A and B, PIV 1, 2, and 3 and AdV, and RT-PCR to detect HRV. RSV was detected in 26.4% (100/379) of samples, FLU A and B in 9.5% (36/379), PIV 1, 2 and 3 in 6.3% (24/379) and AdV in 3.7% (14/379). HRV were detected in 29.6% (112/379) of the negative and indeterminate samples tested by IFI. RSV, particularly among children less than six months of life, and HRV cases showed highest incidence. Negative samples by both IFA and RT-PCR might reflect the presence of other pathogens, such as hMPV, coronavirus, and bacteria. Laboratorial diagnosis constituted an essential instrument to determine the incidence of the most common viruses in respiratory infections among children in this region.
Published: 2006

32. A 2700 calyr BP extreme flood event revealed by sediment accumulation in Amazon floodplains

Author: Jean-Loup Guyot, L. S. Moreira, Renato Campello Cordeiro, Bruno Turcq, Marcelo Amorim, Patricia Moreira-Turcq, Biogéochimie-Traceurs-Paléoclimat (BTP), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636))
Subjects: geography, geography.geographical_feature_category, 010504 meteorology & atmospheric sciences, Floodplain, Flood myth, Amazon rainforest, Intertropical Convergence Zone, Paleontology, Sediment, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], Sediment stratigraphy, 010502 geochemistry & geophysics, Oceanography, Solar irradiance, 01 natural sciences, 13. Climate action, Ecology, Evolution, Behavior and Systematics, Holocene, Geology, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, Earth-Surface Processes
Abstract: Climatic conditions are one of the most important factors affecting hydrological processes in fluvial systems. Higher discharges are responsible for higher erosion, greater transport, and also higher deposition. Consequently, sediment accumulation in Amazonia floodplain river-connected lakes can be directly related to hydrological patterns of the Amazon River mainstream. In this context, we analyzed five sediment cores taken in two floodplain systems situated in the lower Amazon River, to investigate sediment accumulation patterns during the Holocene. Our records show abrupt fluctuations in sedimentation rates in lakes that can reach more than 2 cm/yr during some periods. We find that in all cores, sediment stratigraphy is characterized by packages of sediments of uniform age, which are typically 10–80 cm thick and present a variegated color. The 14 C age of the upper package is about 2700 cal yr BP. During this abrupt event, sediment accumulation rates in floodplain lakes can be at least 200 times higher than those of “normal” periods. This sedimentation event is interpreted as being the consequence of one or several successive extreme floods. The 2700 cal yr BP event has been also observed in other sites in South America and other regions in the world, although different impacts can be observed in each system. This event probably corresponds to a conjunction of favorable conditions for extreme Amazon discharge associated with the Middle to Late Holocene increase of austral summer insolation and shifts of the Intertropical Convergence Zone (ITCZ) from northern to southern positions. In this context, a marked negative peak in solar irradiance at 2700 cal yrs BP seems to have provoked cooling on the continents and a southward shift of the ITCZ associated with a probable reduction in the Atlantic Meridian Overturning Circulation.
Published: 2014

33. Automotive Gasoline Quality Analysis by Gas Chromatography: Study of Adulteration

Author: Luiz Antonio d'Avila, Débora A. Azevedo, and L. S. Moreira
Subjects: Standard sample, Chromatography, Chemistry, Organic solvent, Organic Chemistry, Clinical Biochemistry, Gas chromatography, Gasoline, Mass spectrometry, Automotive gasoline, Biochemistry, Analytical Chemistry
Abstract: The addition of organic solvents (light aliphatic, heavy aliphatic and aromatic hydrocarbons) in Brazilian gasoline is unfortunately very frequent, and this illicit practice impares gasoline quality. Gas chromatography (GC) and gas chromatography coupled to mass spectrometry (GC-MS) analyses can be used as a procedure to improve the detection of adulterated gasoline. The results showed that adulterated samples and also the type of organic solvent used in adulteration can be detected by comparison of chromatographic profiles (standard samples versus adulterated samples). However, a single GC analysis can detect an adulterated gasoline, and so decrease the number of adulterated samples approved as presenting good quality.
Published: 2003

34. Continental and coastal marine records of centennial to millennial changes in South American climate since the last glacial maximum

Author: L. S. Moreira, J.S. Sinninghe Damsté, Renato Campello Cordeiro, J. H. Kim, Patricia Moreira-Turcq, Bruno Turcq, M. Mandengo-Yogo, Sandrine Caquineau, Biogéochimie-Traceurs-Paléoclimat (BTP), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Royal Netherlands Institute for Sea Research (NIOZ), Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Sifeddine, Abdelfettah (ed.), Meyers, P.A. (ed.), Valdés, J. (ed.), and Leite Días da Silva, P. (ed.)
Subjects: Floodplain, Fluvial, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], Glycerol dialkyl glycerol tetraethers, Oceanography, Sedimentary organic matter, Organic matter, ComputingMilieux_MISCELLANEOUS, Ecology, Evolution, Behavior and Systematics, Holocene, Earth-Surface Processes, Hydrology, Total organic carbon, chemistry.chemical_classification, geography, geography.geographical_feature_category, Amazon rainforest, Paleontology, Sediment, 15. Life on land, Amazonian floodplain lakes, chemistry, 13. Climate action, Geology
Abstract: A synthesis of the impacts of the Amazon River hydrological changes on the sedimentation process of organic matter (OM) in three different floodplain lakes (Santa Ninha, Maraca, and Comprido lakes) is presented in this study. Today the Santa Ninha and Maraca lakes are directly and permanently connected with the main channel of the Amazon River, in contrast to Comprido Lake, which is indirectly and periodically influenced by the Amazon River due to its greater distance from the main channel. All three lake sediment records showed a reduced river inflow due to thy climatic conditions during the early and middle Holocene followed by an increased fluvial input during the wetter late Holocene. In Santa Ninha and Maraca Lakes, the reduced river inflow period was recorded by sediments with a low abundance of smectite (on average similar to 20 wt.%), a clay mineral mainly transported by the fluvial system, high total organic carbon (TOC) contents (on average similar to 8.2 wt.%), and a predominantly acidic soil OM input evidenced by high concentrations (on average 180 mu g g(TOC)(-1)) of branched glycerol dialkyl glycerol tetraethers (GDGT). During the late Holocene, a higher smectite abundance (on average similar to 43 wt.%) and a lower TOC content (on average similar to 1.4 wt.%) pointed to greater dilution by riverine lithogenic matter. This change was accompanied by a proportional increase in the aquatically produced crenarchaeol, suggesting a higher lake water level. In Comprido Lake, a sedimentation gap occurred during the early and middle Holocene. The wetter late Holocene, since 3000 cal years BP, was characterized by high TOC values (on average similar to 9 wt.%) and a sharp increase in soil OM input as recorded by an increase in branched GDGT concentrations (on average similar to 81 mu g g(TOC)(-1)), but the smectite content was low (on average similar to 14%). This combination suggests that the soil OM input to Comprido Lake from the local catchment area became dominant during the wet-climate late Holocene due to the large distance of the lake from the Amazon River main channel. Consequently, our study shows that the sedimentation processes of OM in Amazonian floodplain lakes were strongly influenced by variations in the hydrodynamic regime of the Amazon River during the Holocene. However, the impacts of the variations on the three floodplain lakes were different depending on the distance of each lake from the main channel of the Amazon River.
Published: 2014

35. A late Holocene paleoclimate reconstruction from Boqueirão Lake sediments, northeastern Brazil

Author: Bruno Turcq, Abdelfettah Sifeddine, L. S. Moreira, Renato Campello Cordeiro, João Cláudio Cerqueira Viana, Ana Luiza Spadano Albuquerque, Doriedson Ferreira Gomes, Departamento de Geoquimica, Universidade Federal Fluminense [Rio de Janeiro] (UFF), Biogéochimie-Traceurs-Paléoclimat (BTP), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD [France-Nord]), Departamento de Botânica, Universidade Federal da Bahia (UFBA), ANR-10-BLAN-0608,ELPASO,El-Niño : leçons du passé à partir de simulations et d'observations(2010), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636))
Subjects: Atmospheric circulation, Diatom-based transfer function, Intertropical Convergence Zone, [SDE.MCG]Environmental Sciences/Global Changes, MCA, Northern Hemisphere, Paleontology, Oceanography, Convergence zone, Monsoon, ATLANTIQUE, BRESIL, 13. Climate action, Anticyclone, Paleoclimatology, Lake level, Ecology, Evolution, Behavior and Systematics, Holocene, Geology, Earth-Surface Processes, ITCZ, LIA
Abstract: Texto completo: acesso restrito. p.117–126 Submitted by Edileide Reis (leyde-landy@hotmail.com) on 2015-03-24T13:12:06Z No. of bitstreams: 1 João Cláudio Cerqueira Viana.pdf: 1213757 bytes, checksum: 9d96af306e113f5477a5f9eda05605f2 (MD5) Approved for entry into archive by Alda Lima da Silva (sivalda@ufba.br) on 2015-03-27T20:16:54Z (GMT) No. of bitstreams: 1 João Cláudio Cerqueira Viana.pdf: 1213757 bytes, checksum: 9d96af306e113f5477a5f9eda05605f2 (MD5) Made available in DSpace on 2015-03-27T20:16:54Z (GMT). No. of bitstreams: 1 João Cláudio Cerqueira Viana.pdf: 1213757 bytes, checksum: 9d96af306e113f5477a5f9eda05605f2 (MD5) Previous issue date: 2014 Lake level fluctuations and environmental changes during the late Holocene were inferred from changes in sedimentology, bulk and isotope organic geochemistry, and a diatom based transfer function in a sediment core from Boqueirão Lake, northeast Brazil. The age-depth model was established using fifteen AMS 14C dates. Lake water level began increasing about AD 400, and reached its maximum during the Medieval Climate Anomaly (MCA), AD ~ 900–1100. Low lake water level was recorded during the Little Ice Age (LIA), AD ~ 1400–1820, which allowed macrophyte development in the littoral zone that was recorded by high Corg/Ntotal ratios. Considerable lake level variability was evident during the Current Warm Period (CWP). Humid/dry conditions in northeast Brazil during MCA/LIA, respectively, are related to the southward shift of Inter-Tropical Convergence Zone (ITCZ) during austral summer and fall. Those conditions contrast with records of a decrease/increase in the South American Summer Monsoon (SASM) during these periods. This observation also contrasts with paleoclimate inferences from the circum-Caribbean region indicating a northward shift of the ITCZ northern hemisphere summer position during the MCA and a southward shift during the LIA. We suggest that these shifts in ITCZ seasonality were higher during the MCA and smaller during the LIA. Our aim was to answer whether the zonal atmospheric circulation cell between the Amazon and northeast Brazil was responsible for antiphasing with the SASM. A strong monsoon over South America during the LIA reinforced convection upon Amazon, increasing the northeast low in the upper troposphere and large-scale subsidence over northeast Brazil and the Atlantic Ocean leading to a northward repositioning of the South Atlantic Subtropical Anticyclone. These factors in combination may have limited the southward seasonal shift of ITCZ, and they must have been responsible for drier conditions in northeast Brazil during the LIA.
Published: 2014
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36. Evidence for the control of the geochemistry of Amazonian floodplain sediments by stratification of suspended sediments in the Amazon

Author: Francis Sondag, Jérôme Viers, Martin Roddaz, L. S. Moreira, Jean-Loup Guyot, Patricia Moreira-Turcq, and Camille Blondel
Subjects: Provenance, geography, geography.geographical_feature_category, Floodplain, Amazon rainforest, Amazonian, Trace element, Geochemistry, Amazon River, Core sample, Sediment, Major and trace elements, Geology, Nd-Sr isotopes, Geochemistry and Petrology, Floodplain sediments, Holocene, Brazil
Abstract: Holocene and historical Amazonian floodplain deposits collected from two cores of the "Varzea do Curuai" flooded area (Brazil) were analysed for major and trace element geochemistry as well as Nd-Sr isotopic compositions (21 samples). The TA11 and TA14 cores (110 cm and 270 cm in depth, respectively) were collected at different locations in the Varzea, near a channel inlet connecting the Amazon River to the Varzea and at the centre of the Varzea, respectively. The two cores represent records of sedimentation on different time-scales, with TA11 covering the last 100 years and TA14 extending back to 5600 years cal BP. Although the sediments are generally coarser in TA11 than in TA14, the major and trace element concentrations, Cr/Th and Th/Sc and Eu anomalies and Nd-Sr isotopic compositions in both cores fail to show any clear variations with depth. However, there are chemical differences between the two analysed cores. The TA14 sediments have higher Al/Si and Chemical Index of Alteration (CIA) values than those of TA11. The TA14 sediments are enriched in Th, U, Y, Nb, REE, Cs, Rb, V and Ni but show slightly depleted MgO, CaO and Sr and more strongly depleted Na2O, Zr and Hf compared to TA11. In addition, the Nd-Sr isotopic compositions of the TA11 sediment core are on the whole similar to the Solimoes suspended particulate matter (SPM), whereas TA14 has a similar Nd-Sr isotopic composition compared with the SPM of the Amazon River at Obidos. These differences are best explained by chemical stratification of the SPM of the Amazon River. During flooding of the Amazon River, coarser grained particulates supplied by the Solimoes River are deposited in the deepest environments near the channel inlet, as recorded in the TA11 sediment core. By contrast, finer grained suspended sediments derived from the Madeira River are transported into the shallower environments of the Varzea system and deposited as a result of flow expansion and loss of carrying power, as recorded in the TA14 sediment core. Using the Nd isotopic compositions and concentrations of each sediment core, we calculate between similar to 20 and similar to 85% of the sediment input to the TA14 core site is derived from the Madeira River, while between 52% and 100% of the sediment input to the TA11 core sample is supplied by the Solimoes River. Similar calculation using the Sr isotopic compositions and concentrations of TA11 and TA14 sediments gave similar results with between similar to 32% and similar to 49% of TA14 sediments deriving from the Solimoes River while between similar to 70% and similar to 100% of TA11 sediments originate from the Solimoes River. Finally, our findings lead us to question whether particular Amazon deposits that do not integrate the entire range of SPM present in the river are representative of the overall sediment load provided today and in the past by global rivers.
Published: 2014

37. Bioinspired seeding of biomaterials using three dimensional microtissues induces chondrogenic stem cell differentiation and cartilage formation under growth factor free conditions

Author: Leijten, J., primary, Teixeira, L. S. Moreira, additional, Bolander, J., additional, Ji, W., additional, Vanspauwen, B., additional, Lammertyn, J., additional, Schrooten, J., additional, and Luyten, F. P., additional
Published: 2016
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38. Holocene paleoenvironmental reconstruction in the Eastern Amazonian Basin: Comprido Lake

Author: L. S. Moreira, Renato Campello Cordeiro, Sandrine Caquineau, Patricia Moreira-Turcq, Bruno Turcq, João Cláudio Cerqueira Viana, Nilva Brandini, Laboratoire des Mécanismes et Transfert en Géologie (LMTG), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Paléoclimats, proxies, processus (PALEOPROXUS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636))
Subjects: 010506 paleontology, 010504 meteorology & atmospheric sciences, Floodplain, Water flow, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Amazonian, [SDE.MCG]Environmental Sciences/Global Changes, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], Structural basin, SEDIMENT, ANALYSE MINERALOGIQUE, 01 natural sciences, AZOTE, NIVEAU DE L'EAU, HOLOCENE, Holocene, 0105 earth and related environmental sciences, Earth-Surface Processes, Total organic carbon, Hydrology, LAC, geography, geography.geographical_feature_category, ANALYSE CHIMIQUE, MATIERE ORGANIQUE, DIATOMEE, Sediment, Geology, PALEOLIMNOLOGIE, 15. Life on land, CHLOROPHYLLE, CARBONE ORGANIQUE, PALEOCLIMAT, 13. Climate action, CHANGEMENT CLIMATIQUE, Sedimentary rock, Physical geography
Abstract: International audience; Two sediment cores were studied from Comprido Lake, a black water floodplain lake located near Monte Alegre City, Eastern Amazonian Basin. The total organic carbon (TOC), nitrogen content (TN), δ13CTOC, sedimentary chlorophyll, diatom record and mineralogical composition revealed different hydrological and climatic regimes during the Holocene. Between 10,300 and 7800 cal yr BP, a dry climate was suggested by low values of TOC and chlorophyll derivatives concentrations that are related to the development of a C4 grasses on unflooded mud banks. A gap in sedimentation due to a complete dryness of the lake occurred between 7800 and 3000 cal years BP corresponding to the Middle Holocene dry phase. From 3000 cal years BP onwards a gradual increase of the TOC, chlorophyll derivatives and Aulacoseira sp. suggest an increase in the productivity and in water lake level due to the high water flow of the Amazon River and the catchment area as well. The Comprido Lake record indicates that the Late Holocene in this region was characterized by a wetter climate, as also observed in other records of the Amazonian Basin.
Published: 2013

39. Palaeohydrological controls on sedimentary organic matter in an Amazon floodplain lake, Lake Maraca (Brazil) during the late Holocene

Author: J. H. Kim, Sandrine Caquineau, Magloire Mandeng-Yogo, L. S. Moreira, Kita Macario, Jaap S. Sinninghe Damsté, Patricia Moreira-Turcq, Bruno Turcq, Renato Campello Cordeiro, Instituto de Quimica (Departamento de Geoquímica), Universidade Federal Fluminense [Rio de Janeiro] (UFF), Géosciences Environnement Toulouse (GET), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), Paléoclimats, proxies, processus (PALEOPROXUS), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD [France-Nord]), Royal Netherlands Institute for Sea Research (NIOZ), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636))
Subjects: Archeology, 010504 meteorology & atmospheric sciences, Floodplain, EROSION, Amazonian, [SDE.MCG]Environmental Sciences/Global Changes, Geochemistry, SOL ACIDE, AMAZONIE, 010502 geochemistry & geophysics, SEDIMENT, 01 natural sciences, RUISSELLEMENT, PLAINE INONDABLE, DATATION, COMPOSITION MINERALOGIQUE, Sedimentary depositional environment, AZOTE, HOLOCENE, Sedimentary organic matter, Holocene, 0105 earth and related environmental sciences, Earth-Surface Processes, Total organic carbon, Hydrology, Global and Planetary Change, geography, LAC, geography.geographical_feature_category, Ecology, LAC MACARA, MATIERE ORGANIQUE, Paleontology, Sediment, 15. Life on land, SPECTROMETRIE, CARBONE ORGANIQUE, BRESIL, COURS D'EAU, AMAZONE BASSIN VERSANT, 13. Climate action, GEOCHIMIE, CHANGEMENT CLIMATIQUE, HYDRODYNAMIQUE, ISOTOPE, Sedimentary rock, ROCHE SEDIMENTAIRE, PALEOHYDROLOGIE, Geology
Abstract: International audience; In order to understand the impact of hydrological changes of the Amazon River on sedimentary organic matter (OM) composition in Amazonian floodplain lakes, three sediment cores were collected from Lake Maraca (eastern Amazonia) along a transect from the Amazon River main channel to inland. The cores were dated with 14C accelerator mass spectrometry (AMS) and studied by x-ray, mineralogical composition, total organic carbon (TOC) and total nitrogen (TN) contents, stable isotopic composition of TOC and TN (δ13COC) and δ15N) and glycerol dialkyl glycerol tetraether (GDGT) distributions. Two distinctive sedimentary depositional phases were identified based on the mineralogical composition and the geochemical characteristics of sedimentary OM. During the early-mid Holocene (similar to 13,000-3200 cal. yr BP), low values of TOC followed by a break in sedimentation suggest a complete drying of the lake caused by drier climatic conditions. Between 3600 and 3200 cal. yr BP, this lake received a reduced influence of the Amazon River main stem. This induced a predominant deposition of C3-plant-derived OM supplied by surface erosion and runoff of acidic soil. A distinct connection of Lake Maraca to the Amazon River began after 3200 cal. yr BP and became permanently established, with its modern characteristics, at 1880 cal. yr BP. This change provoked an increased contribution of phytoplankton and semi-aquatic C4 macrophytes as well as C3 plant derived more alkaline soil OM to the sedimentary OM pool. Consequently, our study demonstrates that the source of sedimentary OM in the Amazon floodplain lakes was strongly linked to the Amazon River hydrodynamics during the late Holocene. (Abstract author)
Published: 2013

40. Paleohydrological changes in an Amazonian floodplain lake: Santa Ninha Lake

Author: L. S. Moreira, Bruno Turcq, Patricia Moreira-Turcq, Sandrine Caquineau, Renato Campello Cordeiro, Paléoclimats, proxies, processus (PALEOPROXUS), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD [France-Nord]), Instituto de Quimica (Departamento de Geoquímica), Universidade Federal Fluminense [Rio de Janeiro] (UFF), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636))
Subjects: 010506 paleontology, 010504 meteorology & atmospheric sciences, Floodplain, Amazonian, [SDE.MCG]Environmental Sciences/Global Changes, Aquatic Science, 01 natural sciences, Paleoclimatology, Sedimentology, Holocene, 0105 earth and related environmental sciences, Earth-Surface Processes, Amazon Basin, Hydrology, Total organic carbon, geography, geography.geographical_feature_category, Amazon rainforest, Paleohydrology, 15. Life on land, Paleoenvironment, 13. Climate action, Sedimentary rock, Organic matter, Floodplain lakes, Geology
Abstract: International audience; Holocene environments have been reconstructed by sedimentological, mineralogical and organic geochemical analysis of a 270-cm core from Santa Ninha Lake, a floodplain lake in lower Amazonia. Dated by fourteen AMS-radiocarbon dates, the sediment core has a basal age of 5,600 cal years BP and different sedimentary units were identified. These units document various hydrologic phases in the evolution of this lake. Reduced Amazon River influence, with reduced high-water levels of the river, characterized the period between 5,600 and 5,100 cal years BP. Comparison with other Amazonian and Andean paleoclimate studies point to a dryer climate during this phase. After 5,100 cal years BP coarse sediments and quartz increase which suggest a higher inflow of the Amazon River. Between 5,000 and 2,300 cal years BP the coarse sediments and quartz remain high but the organic carbon showed the lowest values. The riverine inflow caused dilution of the organic material produced in the lake and consequently low rates of carbon flux in these phases were recorded. These results show that the hydrodynamics of the Amazon River strongly influence the behavior, productivity and consequently the sedimentation process in the floodplain lakes.
Published: 2012

41. Identificação molecular de bactérias láticas com potencial probiótico isoladas de suínos

Author: L B Alvim, D L Santos, J L S Moreira, J R Nicoli, and A C Nunes
Published: 2010
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42. Omeprazole, clarithromycin and furazolidone for the eradication of Helicobacter pylori in patients with duodenal ulcer

Author: R, Dani, D M, Queiroz, M G, Dias, J M, Franco, L C, Magalhães, G S, Mendes, L S, Moreira, L P, De Castro, N H, Toppa, G A, Rocha, M M, Cabral, and P G, Salles
Subjects: Adult, Male, Time Factors, Adolescent, Helicobacter pylori, Furazolidone, Endoscopy, Middle Aged, Anti-Ulcer Agents, Anti-Bacterial Agents, Helicobacter Infections, Random Allocation, Clarithromycin, Duodenal Ulcer, Humans, Drug Therapy, Combination, Female, Brazil, Omeprazole
Abstract: To evaluate the efficacy of omeprazole plus clarithromycin and furazolidone in Helicobacter pylori eradication and duodenal ulcer healing in Brazilian patients.Forty H. pylori-positive patients with duodenal ulcer were randomized to receive 20 mg omeprazole o.m. or b.d. for 1 month plus 500 mg clarithromycin (b.d. ) and 200 mg furazolidone (b.d.) for 1 week.Three months after the end of the treatment the eradication rates were 90% by intention-to-treat analysis, and 97% by per protocol analysis. Mild side-effects were observed in 25 patients, none of whom abandoned the protocol. No difference was observed between the 20 mg and 40 mg omeprazole daily doses. Cure or significant improvement of the symptoms and of the histological alterations were observed after H. pylori eradication.Our results demonstrate that clarithromycin and furazolidone in combination with omeprazole are a good alternative for H. pylori eradication in Brazilian patients with duodenal ulcer.
Published: 1999

43. The use of ethanol injection under endoscopic control to palliate dysphagia caused by esophagogastric cancer

Author: R. C. L. Coelho, L. S. Moreira, R. Dani, and R. U. Sadala
Subjects: Adult, Male, medicine.medical_specialty, Esophageal Neoplasms, medicine.medical_treatment, Adenocarcinoma, Injections, Intralesional, otorhinolaryngologic diseases, medicine, Humans, Esophagus, Aged, Aged, 80 and over, Chemotherapy, medicine.diagnostic_test, Ethanol, Esophageal disease, business.industry, Stomach, Palliative Care, Gastroenterology, Middle Aged, medicine.disease, Dysphagia, Surgery, Endoscopy, medicine.anatomical_structure, Carcinoma, Squamous Cell, Female, Esophagoscopy, medicine.symptom, business, Complication, Deglutition Disorders
Abstract: Nine patients with dysphagia caused by unresectable tumors of the esophagus and cardia (eight with squamous-cell carcinomas and one with adenocarcinoma) were treated with absolute (95 g/l) alcohol mixed with 0.5% methylene blue. Total volumes ranging from 16 to 41 ml were injected endoscopically during sessions separated at 5-day intervals. The results were evaluated by endoscopic and radiological follow-up, as well as clinically, according to Bown's dysphagia score. Treatment had to be stopped in one patient with a preexisting esophagobronchial fistula. In the remaining eight patients, the mean dysphagia score decreased from 3.4 before treatment to 1.2 after treatment. After treatment, all patients were able to swallow a solid or semisolid diet. Treatment was repeated when dysphagia recurred, with a mean interval of 31.5 days between treatments. No complications were encountered. In our view, the preliminary results using this simple and inexpensive technique warrant comparative trials with other methods of palliation.
Published: 1994

44. Management of cysts and pseudocysts complicating chronic pancreatitis. A retrospective study of 143 patients

Author: M, Barthet, M, Bugallo, L S, Moreira, C, Bastid, B, Sastre, and J, Sahel
Subjects: Male, Postoperative Complications, Pancreatitis, Chronic Disease, Pancreatic Pseudocyst, Drainage, Humans, Female, Endoscopy, Digestive System, Punctures, Middle Aged, Pancreatic Cyst, Retrospective Studies
Abstract: One hundred and forty-three patients presenting with 170 cysts and pseudocysts complicating chronic pancreatitis were followed between 1980 and 1990. Thirteen patients were managed conservatively and pseudocysts spontaneously disappeared in 11 patients. Cysts were small (average 28 mm), often communicating with the ductal system without dilatation of the main pancreatic duct. Percutaneous puncture was performed in 47 patients with a low morbidity rate (5%) but a high rate of recurrence (57%). Thirteen of 39 patients (33%) who underwent percutaneous puncture as initial treatment did not require further therapy. Communication of pancreatic cysts with the ductal system was associated with poorer results after percutaneous puncture. Percutaneous drainage was performed in 9 patients with a low morbidity rate (12%). The mean duration of drainage was 10.4 days. Five patients were definitively cured. Seventy-eight endoscopic cystoenterostomies were performed in 71 patients. Complications occurred in 12 patients (15.3%) and one patient died (1.3%). Endoscopic cystoenterostomy was effective in 39 of 54 patients initially treated with this technique (72.2%). Sixty-three patients underwent surgical management, principally internal drainage (83%), with a morbidity rate of 13.2% and a mortality rate of 1.3%. Twenty-one of the 29 patients (72%) who underwent surgery as initial treatment did not require further therapy. Endoscopic cystoenterostomy is an efficient treatment of cysts and pseudocysts complicating CP when anatomical conditions are favorable. Percutaneous drainage also appears to be a satisfactory treatment modality. Surgery should be considered in cases of failure or technical impossibility of endoscopic or percutaneous approaches.
Published: 1993

45. Treatment of granular cell tumor of the esophagus by endoscopic injection of dehydrated alcohol

Author: L S, Moreira and R, Dani
Subjects: Esophageal Neoplasms, Ethanol, Granular Cell Tumor, Humans, Female, Esophagoscopy, Middle Aged
Abstract: Granular cell tumor of the esophagus (GCTE) is a rare and mostly benign neoplasm. Its etiology is unknown and its histogenesis is uncertain. It is usually an incidental finding, detected during esophagogastroduodenoscopy. In symptomatic cases, or when the lesions are more than 1 cm in diameter, the treatment of choice has been local resection. Asymptomatic patients or tumors smaller than 1 cm are followed endoscopically. We describe a case of GCTE successfully treated by endoscopic injection of dehydrated ethyl alcohol. To our knowledge, it is the first time that such a tumor was treated by this accessible and low-cost technique.
Published: 1992

46. [Treatment of pseudocysts in acute pancreatitis. Retrospective study of 45 patients]

Author: M, Barthet, M, Bugallo, L S, Moreira, C, Bastid, B, Sastre, and J, Sahel
Subjects: Adult, Male, Punctures, Middle Aged, Cystostomy, Pancreatectomy, Pancreatitis, Acute Disease, Pancreatic Pseudocyst, Drainage, Humans, Female, Endoscopy, Digestive System, Aged, Retrospective Studies
Abstract: A total of 55 pancreatic pseudocysts in 45 patients with acute pancreatitis were managed between 1980 and 1990. Six patients were managed conservatively with resolution of pseudocysts in 5 patients. All pancreatic pseudocysts that disappeared were smaller than 35 mm. CT or ultrasound-guided aspiration were performed in 26 patients with a morbidity rate of 5%. Nine among 21 patients (42%) who were initially treated by percutaneous puncture were definitively cured: all pseudocysts were smaller than 55 mm. Nine patients were managed by long-term percutaneous drainage: 3 minor complications occurred and in 7 patients, no other treatment was necessary even for large pseudocysts. Endoscopic cystoenterostomy was performed in 12 patients. Only 15 pseudocysts (27%) bulged into the digestive wall, mainly of the stomach. Three complications (following 2 cystogastrostomies) occurred and one patient died after endoscopic cystogastrostomy. In 7 patients (58%), no other treatment was necessary even for large pancreatic pseudocysts. Surgery was required in 13 patients but only 4 patients underwent surgery as primary treatment. One major complication occurred and one patient died. Percutaneous drainage and endoscopic cystoenterostomy when technically feasible, are effective treatments of pancreatic pseudocysts complicating acute pancreatitis.
Published: 1992

47. Macromolecular Crowding Drives Cartilage Formation in Chondrogenic Stem Cell Microtissues

Author: Leijten, J., Teixeira, L. S. Moreira, Bolander, J., Smeets, B., Ji, W., Odenthal, T., Lambrechts, D., Hans Van Oosterwyck, and Luyten, F.

48. Enhanced Metabolism & Osteochondrogenic Differentiation of Human Periosteal-derived Cells upon Microaggregation: A Biomimetic Approach towards Tissue Engineered Constructs

Author: Wei Ji, Bolander, J., Leijten, J., Teixeira, L. S. Moreira, Schrooten, J., and Luyten, F. P.

49. Enzymatically-crosslinked injectable hydrogels based on biomimetic dextran-hyaluronic acid conjugates for cartilage tissue engineering.

Author: Jin R, Teixeira LS, Dijkstra PJ, van Blitterswijk CA, Karperien M, and Feijen J
Subjects: Animals, Biocompatible Materials chemistry, Carbohydrate Conformation, Carbohydrate Sequence, Cartilage pathology, Cattle, Cell Proliferation, Cells, Cultured, Chondrocytes chemistry, Chondrocytes cytology, Cross-Linking Reagents chemistry, Extracellular Matrix chemistry, Extracellular Matrix metabolism, Injections, Materials Testing, Models, Molecular, Molecular Sequence Data, Sympathomimetics chemistry, Tissue Scaffolds chemistry, Tyramine chemistry, Biomimetics, Cartilage chemistry, Dextrans chemistry, Hyaluronic Acid chemistry, Hydrogels chemistry, Tissue Engineering instrumentation, Tissue Engineering methods
Abstract: Polysaccharide hybrids consisting of hyaluronic acid (HA) grafted with a dextran-tyramine conjugate (Dex-TA) were synthesized and investigated as injectable biomimetic hydrogels for cartilage tissue engineering. The design of these hybrids (denoted as HA-g-Dex-TA) is based on the molecular structure of proteoglycans present in the extracellular matrix of native cartilage. Hydrogels of HA-g-Dex-TA were rapidly formed within 2 min via enzymatic crosslinking of the tyramine residues in the presence of horseradish peroxidase and hydrogen peroxide. The gelation time, equilibrium swelling and storage modulus could be adjusted by varying the degree of substitution of tyramine residues and polymer concentration. Bovine chondrocytes incorporated in the HA-g-Dex-TA hydrogels remained viable, as shown by the Live-dead assay. Moreover, enhanced chondrocyte proliferation and matrix production were observed in the HA-g-Dex-TA hydrogels compared to Dex-TA hydrogels. These results suggest that HA-g-Dex-TA hydrogels have a high potential as injectable scaffolds for cartilage tissue engineering., (Copyright 2010 Elsevier Ltd. All rights reserved.)
Published: 2010
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