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287 results on '"Universidad Autonoma Metropolitana - Iztapalapa"'

1. Biogeochemical typology and temporal variability of lagoon waters in a coral reef ecosystem subject to terrigeneous and anthropogenic inputs (New Caledonia)

Author

Philippe Gérard, Renaud Fichez, F. Gutierrez, Sylvain Ouillon, Aymeric Jouon, Sandrine Chifflet, Christian Grenz, Pascal Douillet, Grenz, Christian (ed.), Le Borgne, Robert (ed.), Caractérisation et modélisation des échanges dans des lagons soumis aux influences terrigènes et anthropiques (CAMELIA), Institut de Recherche pour le Développement (IRD [Nouvelle-Calédonie])-Institut de Recherche pour le Développement (IRD [Guyane]), Centre d'océanologie de Marseille (COM), Université de la Méditerranée - Aix-Marseille 2-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), IRD, Universidad Autonoma Metropolitana Iztapalapa (IRD), Universidad Autonoma Metropolitana - Iztapalapa, OPLC, Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD [Nouvelle-Calédonie]), Universidad Autonoma Metropolitana Iztapalapa (DCBS), DCBS, Echanges Côte-Large (ECOLA), Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-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)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), 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 Physique et Biogéochimique (LOPB), Caractérisation et modélisation des échanges dans des lagons soumis aux influences terrigènes et anthropiques ( CAMELIA ), Institut de Recherche pour le Développement ( IRD [Nouvelle-Calédonie] ) -Institut de Recherche pour le Développement ( IRD [Guyanne] ), Centre d'océanologie de Marseille ( COM ), Centre National de la Recherche Scientifique ( CNRS ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Université de la Méditerranée - Aix-Marseille 2, IRD, Universidad Autonoma Metropolitana Iztapalapa ( IRD ), Institut méditerranéen d'océanologie ( MIO ), Centre National de la Recherche Scientifique ( CNRS ) -Université de Toulon ( UTLN ) -Aix Marseille Université ( AMU ) -Institut de Recherche pour le Développement ( IRD ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Toulon ( UTLN ) -Aix Marseille Université ( AMU ) -Institut de Recherche pour le Développement ( IRD ), Institut de Recherche pour le Développement ( IRD [Nouvelle-Calédonie] ), Universidad Autonoma Metropolitana Iztapalapa ( DCBS ), ECOLA LEGOS, Laboratoire d'études en Géophysique et océanographie spatiales ( LEGOS ), Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National d'Etudes Spatiales ( CNES ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Observatoire Midi-Pyrénées ( OMP ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National d'Etudes Spatiales ( CNES ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Observatoire Midi-Pyrénées ( OMP ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire d'Océanographie Physique et Biologique ( LOPB ), Université de la Méditerranée - Aix-Marseille 2-Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ), 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)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), and 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)

Subjects
Chlorophyll, 0106 biological sciences, SALINITE, Time Factors, 010504 meteorology & atmospheric sciences, SEL NUTRITIF, Oceanography, 01 natural sciences, Trophic status, CYCLE BIOGEOCHIMIQUE, VARIATION TEMPORELLE, LAGON, Cluster Analysis, Water pollution, TEMPERATURE, Trophic level, geography.geographical_feature_category, [ SDU.STU.OC ] Sciences of the Universe [physics]/Earth Sciences/Oceanography, Ecology, IMPACT DE L'ENVIRONNEMENT, NIVEAU TROPHIQUE, Coral reef, Anthozoa, Pollution, Seasons, Environmental Monitoring, Biogeochemical cycle, Aquatic Science, Coral reef lagoon, New Caledonia, Animals, Seawater, Ecosystem, 14. Life underwater, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography, 0105 earth and related environmental sciences, geography, Chlorophyll A, 010604 marine biology & hydrobiology, Biogeochemistry, Temporal variability, Nutrients, 15. Life on land, RECIF CORALLIEN, Typology, 13. Climate action, Environmental science, Spatial variability, Hydrology, Eutrophication, Water Pollutants, Chemical
Abstract

International audience; Considering the growing concern about the impact of anthropogenic inputs on coral reefs and coral reef lagoons, surprisingly little attention has been given to the relationship between those inputs and the trophic status of lagoon waters. The present paper describes the distribution of biogeochemical parameters in the coral reef lagoon of New Caledonia where environmental conditions allegedly range from pristine oligotrophic to anthropogenically influenced. The study objectives were to: (i) identify terrigeneous and anthropogenic inputs and propose a typology of lagoon waters, (ii) determine temporal variability of water biogeochemical parameters at time-scales ranging from hours to seasons. Combined ACP-cluster analyses revealed that over the 2000 km2 lagoon area around the city of Nouméa, "natural" terrigeneous versus oceanic influences affecting all stations only accounted for less than 20% of the spatial variability whereas 60% of that spatial variability could be attributed to significant eutrophication of a limited number of inshore stations. ACP analysis allowed to unambiguously discriminating between the natural trophic enrichment along the offshore-inshore gradient and anthropogenically induced eutrophication. High temporal variability in dissolved inorganic nutrients concentrations strongly hindered their use as indicators of environmental status. Due to longer turn over time, particulate organic material and more specifically chlorophyll a appeared as more reliable nonconservative tracer of trophic status. Results further provided evidence that ENSO occurrences might temporarily lower the trophic status of the New Caledonia lagoon. It is concluded that, due to such high frequency temporal variability, the use of biogeochemical parameters in environmental surveys require adapted sampling strategies, data management and environmental alert methods.

Published
2010
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2. Momentum transport in the free fluid-porous medium transition layer: the one-domain approach

Author

Benoit Goyeau, Philippe Angot, Roel Hernandez-Rodriguez, J. Alberto Ochoa-Tapia, Universidad Autonoma Metropolitana - Iztapalapa, Institut de Mathématiques de Marseille (I2M), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Aix-Marseille Université - Faculté des Sciences (AMU SCI), Aix Marseille Université (AMU), Laboratoire d'Énergétique Moléculaire et Macroscopique, Combustion (EM2C), and CentraleSupélec-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
One-domain approach, Work (thermodynamics), Local closure problem, General Chemical Engineering, Context (language use), 010103 numerical & computational mathematics, 01 natural sciences, Industrial and Manufacturing Engineering, 010305 fluids & plasmas, Momentum, [CHIM.GENI]Chemical Sciences/Chemical engineering, 0103 physical sciences, Momentum transport, Tensor, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], 0101 mathematics, Physics, Applied Mathematics, Free flow/porous medium inter-region, General Chemistry, Mechanics, [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, Permeability (earth sciences), Compressibility, Closure problem, Porous medium
Abstract

International audience; In this work, we consider the momentum transport of a incompressible fluid in a like Beavers and Joseph (1967) system. For this purpose, in the context of the volume averaging method, we use a one-domain approach (ODA). Thus, the momentum generalized transport equations (GTE), which are written in terms of position-dependent effective medium coefficients, are valid everywhere in the system and contains two Brinkman corrections in addition to a Darcy’s term. The ODA predictions are tested against the results obtained from averaging the local profiles resulting from pore-scale simulations. One of the key points for solving the ODA remains on the prediction of the permeability, which in this work is obtained either by solving the associated local closure problem or from pore-scale profiles. Our analysis shows that the GTE for momentum transport accurately predicts the average velocity profiles everywhere in the system. To this end, the first and the second Brinkman’s corrections, as well as a position-dependent intrinsic permeability tensor in Darcy’s term must be included.

Published
2022
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3. Possible Adverse Effects of Food Additive E171 (Titanium Dioxide) Related to Particle Specific Human Toxicity, Including the Immune System

Author

Antoon Opperhuizen, Morten Poulsen, Dick T. H. M. Sijm, Hubert Dirven, Gerhard Rogler, Eric Houdeau, Nicolaj S Bischoff, Simone G. J. van Breda, David Michael Gott, Jacqueline Castenmiller, Theo M. de Kok, Henk Van Loveren, Jacco J. Briedé, Yolanda I. Chirino, Agnes G. Oomen, University of Zurich, Bischoff, Nicolaj S, School for Oncology and Developmental Biology [Maastricht] (GROW), Maastricht University [Maastricht]-Maastricht University Medical Centre (MUMC), Maastricht University [Maastricht], Netherlands Food and Consumer Product Safety Authority (NVWA), Universidad Autonoma Metropolitana - Iztapalapa, Norwegian Institute of Public Health [Oslo] (NIPH), FOOD STANDARDS AGENCY LONDON GBR, Partenaires IRSTEA, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), ToxAlim (ToxAlim), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), National Institute for Public Health and the Environment [Bilthoven] (RIVM), Technical University of Denmark [Lyngby] (DTU), University hospital of Zurich [Zurich], and Office of Risk Assessment and Research of Netherlands Food and Consumer Product Safety Authority (NVWA)

Subjects
0301 basic medicine, 3 NANOSCALE, tio2 nanoparticles, 1607 Spectroscopy, 010501 environmental sciences, 01 natural sciences, in-vivo, INTESTINAL EPITHELIUM, Dietary Exposure, lcsh:Chemistry, Adverse health effect, Adverse Outcome Pathway, Medicine, Ingestion, TiO2, Coloring Agents, lcsh:QH301-705.5, Spectroscopy, Titanium, dna-damage, General Medicine, 3. Good health, Computer Science Applications, food safety, 10219 Clinic for Gastroenterology and Hepatology, [SDV.TOX]Life Sciences [q-bio]/Toxicology, nanomaterial, 1606 Physical and Theoretical Chemistry, Risk assessment, TiO 2, food.ingredient, PIGMENT-GRADE, 1503 Catalysis, review, 610 Medicine & health, Catalysis, Inorganic Chemistry, 03 medical and health sciences, food, Immune system, mode of action, Environmental health, Toxicity Tests, 1312 Molecular Biology, 1706 Computer Science Applications, Animals, Humans, EXPOSURE, Physical and Theoretical Chemistry, Adverse effect, Molecular Biology, E171, 0105 earth and related environmental sciences, food additive, 1604 Inorganic Chemistry, business.industry, titanium dioxide, Food additive, Organic Chemistry, adverse health effects, technology, industry, and agriculture, risk-assessment, toxicity, Food safety, sprague-dawley, 030104 developmental biology, oral toxicity, lcsh:Biology (General), lcsh:QD1-999, Nanoparticles, nano size, business, oral exposure, 1605 Organic Chemistry
Abstract

Titanium dioxide (TiO2) is used as a food additive (E171) and can be found in sauces, icings, and chewing gums, as well as in personal care products such as toothpaste and pharmaceutical tablets. Along with the ubiquitous presence of TiO2 and recent insights into its potentially hazardous properties, there are concerns about its application in commercially available products. Especially the nano-sized particle fraction (2 warrants a more detailed evaluation of potential adverse health effects after ingestion. A workshop organized by the Dutch Office for Risk Assessment and Research (BuRO) identified uncertainties and knowledge gaps regarding the gastrointestinal absorption of TiO2, its distribution, the potential for accumulation, and induction of adverse health effects such as inflammation, DNA damage, and tumor promotion. This review aims to identify and evaluate recent toxicological studies on food-grade TiO2 and nano-sized TiO2 in ex-vivo, in-vitro, and in-vivo experiments along the gastrointestinal route, and to postulate an Adverse Outcome Pathway (AOP) following ingestion. Additionally, this review summarizes recommendations and outcomes of the expert meeting held by the BuRO in 2018, in order to contribute to the hazard identification and risk assessment process of ingested TiO2.

Published
2021
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4. Evolution of Physico-Chemical and Microbiological Parameters During Large-Scale Coffee-Pulp Silage

Author

Quentin Carboué, Jean-Philippe Carralot, Eduardo Aranda-Delgado, Gerardo Saucedo-Castañeda, Isabelle Perraud-Gaime, Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE), Avignon Université (AU)-Aix Marseille Université (AMU)-Institut de recherche pour le développement [IRD] : UMR237-Centre National de la Recherche Scientifique (CNRS), Terranova Lombricultores, Universidad Autonoma Metropolitana - Iztapalapa, and Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UMR237-Aix Marseille Université (AMU)-Avignon Université (AU)

Subjects
0106 biological sciences, Environmental Engineering, [SDV.BIO]Life Sciences [q-bio]/Biotechnology, Silage, 020209 energy, Population, Food spoilage, 02 engineering and technology, engineering.material, 01 natural sciences, Butyric acid, chemistry.chemical_compound, 010608 biotechnology, 0202 electrical engineering, electronic engineering, information engineering, Ethanol fuel, Dry matter, Food science, education, Waste Management and Disposal, ComputingMilieux_MISCELLANEOUS, 2. Zero hunger, education.field_of_study, Renewable Energy, Sustainability and the Environment, Pulp (paper), 15. Life on land, Lactic acid, chemistry, engineering
Abstract

Coffee-pulp (CP) is an agricultural by-product produced in tropical regions. The high moisture and high carbohydrates content promote rapid spoilage by microorganisms together with detrimental consequences for the environment. Proper conservation of this biomass could be useful as a substrate for other processes. The feasibility of CP silage without any additive was studied at a large scale. Four silages were carried out each one containing 4.5 t of CP. Coffee-pulp silage was monitored during three months and samples were collected at regular intervals of time. Samples were used to determine microbiological parameters (lactic acid bacteria and yeasts population) and physicochemical variables like dry matter, pH, water-soluble carbohydrates, organic acids and ethanol. In all the 4 silages carried out, a high level of lactic acid was rapidly reached, decreasing the pH. Additionally, acetic and propionic acids were produced inducing an antifungal effect. Limited ethanol production was observed in the first days of silage due to the yeast´s activity. The internal temperature of silos rose indicating residual aerobic activity. Stable silage conditions in terms of high lactic acid concentration (> 8% DM), low pH (3.9) and no butyric acid production, were established during the first 72 h. These CP silage variables were kept constant after 30 days and until 90 days. Coffee-pulp is a suitable agricultural by-product for in situ conservation at large-scale silage process without addition of inoculum.

Published
2021
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5. Macroscopic model for flow in exuding porous media

Author

Lasseux, Didier, Valdés-Parada, Francisco, Mourzenko, Valeri, Thovert, Jean-François, Institut de Mécanique et d'Ingénierie (I2M), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Universidad Autonoma Metropolitana - Iztapalapa, Departamento de Ingeniería de Procesos e Hidráulica, Département Fluides, Thermique et Combustion (FTC), Institut Pprime (PPRIME), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS), Combustion Hétérogène et milieu poreux (CH ), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Institut Pprime (PPRIME), and Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics::Fluid Dynamics, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Porous media, general fluid mechanics, Physics::Geophysics, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]
Abstract

International audience; Single-phase macroscopic flow in a rigid porous medium is traditionally described by classical Darcy's law which can be formally derived by upscaling the pore-scale flow equation in the creeping incompressible flow regime and the no-slip condition at the solid-fluid interfaces. However, there are many situations for which fluid release from the surface into the pores or, conversely, absorption from the pores into the solid through the interfaces may occur. To cite some but a few, this case is encountered in drying (Vu & Tsotsas, 2018) and pyrolysis (Mahmoudi et al., 2014) of porous materials, vapor bubble migration in ice due to temperature gradient (Shreve, 1967) or processes for which a chemical reaction in a porous material leads to a net production of fluid from the surface into the pores or, conversely, absorption from the pores into the solid through the interfaces. This translates into a local normal flux at the solid fluid-interface, featuring a generic problem which may be referred to as flow in exuding porous media. Although classical Darcy's law has been widely heuristically employed to describe this type of flow, the question remains on the physical relevance of such an assumption.

Published
2021

6. The Consumption of Cholesterol-Enriched Diets Conditions the Development of a Subtype of HCC with High Aggressiveness and Poor Prognosis

Author

Lisette Chávez-Rodríguez, María Concepción Gutiérrez-Ruiz, Verónica Souza, Jens U. Marquardt, Luis Enrique Gómez-Quiroz, Arturo Simoni-Nieves, Cédric Coulouarn, Alejandro Escobedo-Calvario, Matthis Desoteux, Soraya Salas-Silva, Roxana U. Miranda-Labra, Leticia Bucio, Linda E. Muñoz-Espinosa, Universidad Autonoma Metropolitana, Unidad Iztapalapa (UAM), Chemistry, Oncogenesis, Stress and Signaling (COSS), Université de Rennes (UR)-CRLCC Eugène Marquis (CRLCC)-Institut National de la Santé et de la Recherche Médicale (INSERM), CRLCC Eugène Marquis (CRLCC), Universidad Autonoma de Nuevo Leon [Mexique] (UANL), University Medical Center of Schleswig–Holstein = Universitätsklinikum Schleswig-Holstein (UKSH), Kiel University, Consejo Nacional de Ciencia y Tecnologia (CONACYT): Fronteras de la Ciencia Consejo Nacional de Ciencia y Tecnologia (CONACyT) [1320, CB-252942], German Research Foundation German Research Foundation (DFG) [MA 4443/2-2, SFB1292], Volkswagen Foundation (Lichtenberg program), Wilhelm-Sander Foundation [2017.007.1], Universidad Autonoma Metropolitana Iztapalapa, ConacytConsejo Nacional de Ciencia y Tecnologia (CONACyT), Jonchère, Laurent, Université de Rennes 1 (UR1), and Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-CRLCC Eugène Marquis (CRLCC)-Institut National de la Santé et de la Recherche Médicale (INSERM)

Subjects
0301 basic medicine, Cancer Research, Physiology, [SDV.CAN]Life Sciences [q-bio]/Cancer, Disease, lcsh:RC254-282, High cholesterol, Article, 03 medical and health sciences, chemistry.chemical_compound, 0302 clinical medicine, [SDV.CAN] Life Sciences [q-bio]/Cancer, NAFLD, medicine, HCC, Western diet, Cholesterol, business.industry, Fatty liver, NASH, cholesterol, lcsh:Neoplasms. Tumors. Oncology. Including cancer and carcinogens, medicine.disease, Phenotype, digestive system diseases, 3. Good health, 030104 developmental biology, Oncology, chemistry, 030220 oncology & carcinogenesis, Hepatocellular carcinoma, Steatohepatitis, Liver cancer, business
Abstract

Non-alcoholic fatty liver disease (NAFLD) and progression to non-alcoholic steatohepatitis (NASH) result as a consequence of diverse conditions, mainly unbalanced diets. Particularly, high-fat and cholesterol content, as well as carbohydrates, such as those commonly ingested in Western countries, frequently drive adverse metabolic alterations in the liver and promote NAFLD development. Lipid liver overload is also one of the main risk factors for initiation and progression of hepatocellular carcinoma (HCC), but detailed knowledge on the relevance of high nutritional cholesterol remains elusive. We were aimed to characterize HCC development in mice fed with a Western diet (high in lipids and cholesterol) and to identify molecular alterations that define a subtype of liver cancer induced by lipid overload. Mice under western or high cholesterol diets more frequently developed tumors with a more aggressive phenotype than animals fed with a chow diet. Associated changes involved macrophage infiltration, angiogenesis, and stemness features. RNA-seq revealed a specific gene expression signature (Slc41a, Fabp5, Igdcc4 and Mthfd1l) resembling the adverse phenotypic features and poor clinical outcomes seen in patients with HCC. In conclusion, consumption of lipid enriched diets, particularly cholesterol, could accelerate HCC development with an aggressive phenotype and poor prognosis

Published
2021
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7. The variety, roasting, processing, and type of cultivation determine the low OTA levels of commercialized coffee in Chiapas State, Mexico

Author

Gabriela Rodríguez-Serrano, Noël Durand, Maria Eugenia Aguilar-Alvarez, Isabelle Perraud-Gaime, Gerardo Saucedo-Castañeda, Rosa Obdulia González-Robles, Universidad Autonoma Metropolitana - Iztapalapa, Démarche intégrée pour l'obtention d'aliments de qualité (UMR QualiSud), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Avignon Université (AU)-Université de La Réunion (UR)-Université de Montpellier (UM)-Institut Agro - Montpellier SupAgro, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Département Performances des systèmes de production et de transformation tropicaux (Cirad-PERSYST), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE), Avignon Université (AU)-Aix Marseille Université (AMU)-Institut de recherche pour le développement [IRD] : UMR237-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD), Departamento de Matemáticas, FONCICYT 273656, ANR-15-CE21-0018,ANGELICA,Utilisation des bactéries lactiques pour le contrôle du niveau d'ochratoxine A sur les grains de café.(2015), and Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Avignon Université (AU)-Université de La Réunion (UR)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)

Subjects
Ochratoxin A, Arabica coffee, Biology, 01 natural sciences, Toxicology, chemistry.chemical_compound, Health problems, 0404 agricultural biotechnology, Q02 - Traitement et conservation des produits alimentaires, Traitement des aliments, [SDV.IDA]Life Sciences [q-bio]/Food engineering, Statistical analysis, Ochratoxine, sécurité des aliments, Roasting, 2. Zero hunger, Torréfaction, 010401 analytical chemistry, Coffea arabica, 04 agricultural and veterinary sciences, Mexican coffee, Sécurité sanitaire des aliments, 040401 food science, 0104 chemical sciences, chemistry, Grillage, Q03 - Contamination et toxicologie alimentaires, ochratoxin A, Chiapas, Food Science, Biotechnology
Abstract

International audience; Ochratoxin A (OTA) in coffee is associated with serious health problems and significant economic loss. The state of Chiapas is the top coffee producer in Mexico, accounting for 41.3% of the national production, and the second largest organic coffee-producing area worldwide. Due to the lack of information about the OTA content in Chiapas coffee, 100 coffee samples from Chiapas were collected and classified according to their variety, type (roasted or nonroasted), processing and cultivation, in the 2017/2018 cycle. The average OTA concentration in 97 of the analyzed samples was 0.41 μg/kg. OTA was not detected in 52% of the samples; in 45% of the samples, the concentration ranged between 0.05 and 3.4 μg/kg, below the limit of European regulations (

Published
2021
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8. Synthesis and optical properties of 1-ethyl-indol-3-yl-substituted aza-BODIPY dyes at the 1,7-positions

Author

Luis Loaeza, Valérie Maraval, Norberto Farfán, Geraldyne Castro, Ricardo Corona-Sánchez, Rosa Santillan, Margarita Romero-Ávila, Remi Chauvin, Facultad de Quimica, Universidad Nacional Autonoma de Mexico, Laboratoire de chimie de coordination (LCC), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Departemento de Quimica, Universidad Autonoma Metropolitana-Iztapalapa, Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV), CONACYT grant (576732), CONACYT, PAIP, PAPIIT (IN 222819), French-Mexican International Laboratory (LIA-LCMMC-CONACYT) programs, Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Indol-3-yl substituents, Chloroform, Absorption spectroscopy, 010405 organic chemistry, Band gap, Organic Chemistry, Aza-BODIPY, 010402 general chemistry, Photochemistry, 01 natural sciences, Biochemistry, 0104 chemical sciences, Organic semiconductor, chemistry.chemical_compound, Near-infrared, chemistry, Extinction (optical mineralogy), Drug Discovery, Bathochromic shift, Aza-bodipy, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Absorption (chemistry)
Abstract

International audience; New aza-BODIPYs with significant bathochromic shifts in their UV–vis absorption spectrum were synthesized by the installation of 1-ethyl-indol-3-yl moieties at the 1,7-positions of the aza-BODIPY core bearing 4-substituted phenyl or thien-2-yl groups at the 3,5-positions. The compounds described herein show strong NIR absorptions up to 779 nm, and emissions up to 805 nm in chloroform solution, and present large molar extinction coefficients. The absorption and emission bands of aza–BODIPYs were significantly red-shifted, by ca 100 nm, relative to the 3,5-dianisyl-1,7-diphenyl aza-BODIPY. TD-DFT calculations indicate an effective electronic conjugation between the aza-BODIPY core and the substituents. Absorption of the studied aza-BODIPY derivatives corresponds to a charge transfer from donor substituents toward the boron-centered core. Moreover, computational results show that all the compounds present HOMO–LUMO band gap values that are in the organic semiconductor range.

Published
2021
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21. Exuding porous media: deviations from Darcy's law

Author

Francisco J. Valdés-Parada, Didier Lasseux, V. V. Mourzenko, Jean-François Thovert, Institut de Mécanique et d'Ingénierie (I2M), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Universidad Autonoma Metropolitana - Iztapalapa, Departamento de Ingeniería de Procesos e Hidráulica, Combustion Hétérogène et milieu poreux (CH ), Département Fluides, Thermique et Combustion (FTC), Institut Pprime (PPRIME), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Institut Pprime (PPRIME), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS), and Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS)

Subjects
upscaling, Mass flux, 010504 meteorology & atmospheric sciences, 01 natural sciences, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], Physics::Geophysics, 010305 fluids & plasmas, Physics::Fluid Dynamics, exuding porous media, porous media, 0103 physical sciences, Newtonian fluid, 0105 earth and related environmental sciences, Physics, Darcy's law, Internal flow, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Mechanical Engineering, Mechanics, Condensed Matter Physics, momentum transport, Mechanics of Materials, Drag, Compressibility, general fluid mechanics, Closure problem, Transport phenomena
Abstract

International audience; This work addresses the question of a pertinent macroscale model describing creeping, incompressible and single-phase flow of a Newtonian fluid in an exuding, rigid and homogeneous porous medium. The macroscopic model is derived by upscaling the pore-scale Stokes equations considering a normal mass flux at the solid–fluid interface. The upscaled mass equation shows that the average velocity is non-solenoidal. In addition, the macroscopic momentum equation involves a Darcy term with the classical permeability tensor accounting for macroscopic drag and a correction velocity vector which is a signature of the local fluid displacements induced by the exuding phenomenon. This correction is the sum of a term accounting for the local exuding effect and a compensation term associated with the assumption of spatial periodicity. Both the first term and the permeability tensor are obtained from the solution of the same unique and intrinsic closure problem, which corresponds to that involved in the classical Darcy’s law. The upscaled model is validated by comparisons with pore-scale numerical simulations in several illustrative examples. The different configurations evidence the richness of the problem, despite the apparent simplicity of its formulation. The results of this work motivate further investigation about the influence of internal flow sources in transport phenomena in porous media.

Published
2021
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22. Upscaled model for unsteady slip flow in porous media

Author

Francisco J. Valdés-Parada, Alessandro Bottaro, Didier Lasseux, Institut de Mécanique et d'Ingénierie (I2M), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Universidad Autonoma Metropolitana - Iztapalapa, and Universita degli studi di Genova

Subjects
Physics, Mechanical Engineering, 010102 general mathematics, [PHYS.MPHY]Physics [physics]/Mathematical Physics [math-ph], Mechanics, Slip (materials science), Stokesian dynamics, Condensed Matter Physics, 01 natural sciences, 010305 fluids & plasmas, Physics::Fluid Dynamics, porous media, Flow velocity, Mechanics of Materials, Macroscopic scale, General fluid mechanics, 0103 physical sciences, Newtonian fluid, Initial value problem, Closure problem, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], 0101 mathematics, Slip flow regime, Porous medium, Pressure gradient
Abstract

International audience; This work reports on modelling unsteady gas flow in porous media at the macroscopic scale in the slip regime, a topic of interest in a wide range of applications. The slip effect is modelled by means of a Navier-type boundary condition. A macroscopic model is derived from the initial-boundary-value problem governing unsteady, single-phase flow of a Newtonian fluid through homogeneous porous media in the creeping, isothermal and slightly compressible slip regime. For momentum transport, the macroscopic model involves two terms. The first consists of a convolution product between the macroscopic pressure gradient and the temporal derivative of an apparent dynamic permeability tensor; the second accounts for the memory of the initial condition. Both contributions are predicted from the solution of a unique closure problem that is independent of the initial flow configuration and of the macroscopic pressure gradient. The accuracy of the model is assessed by comparisons with direct numerical simulations performed at the pore-scale, which find excellent agreement. The simulations also show that a classical heuristic model, which is the consequence of assuming a separation of time scales between the pore-scale and the macroscale, is inadequate, in general, to correctly predict the macroscopic velocity. Results from this work provide a formal clear insight about unsteady flow in porous media in the slip regime, motivating further theoretical and experimental work.

Published
2021
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23. Macroscopic Model for Passive Mass Dispersion in Porous Media Including Knudsen and Diffusive Slip Effects

Author

Francisco J. Valdés-Parada, Didier Lasseux, Departamento de Ingeniería de Procesos e Hidráulica, Universidad Autonoma Metropolitana - Iztapalapa, Institut de Mécanique et d'Ingénierie (I2M), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Arts et Métiers Sciences et Technologies, and HESAM Université (HESAM)-HESAM Université (HESAM)

Subjects
diffusive slip, Materials science, Knudsen slip, Slip (materials science), Péclet number, 01 natural sciences, Environmental technology. Sanitary engineering, 010305 fluids & plasmas, Physics::Geophysics, volume averaging, Physics::Fluid Dynamics, symbols.namesake, 0103 physical sciences, Newtonian fluid, Boundary value problem, [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph], 010306 general physics, TD1-1066, Darcy's law, General Medicine, Mechanics, Fick's laws of diffusion, symbols, Knudsen number, Porous medium, dispersion in porous media
Abstract

International audience; In this work, a macroscopic model for incompressible and Newtonian gas flow coupled to Fickian and advective transport of a passive solute in rigid and homogeneous porous media is derived. At the pore-scale, both momentum and mass transport phenomena are coupled, not only by the convective mechanism in the mass transport equation, but also in the solid-fluid interfacial boundary condition. This boundary condition is a generalization of the Kramers-Kistemaker slip condition that includes the Knudsen effects. The resulting upscaled model, applicable in the bulk of the porous medium, corresponds to: 1) A Darcy-type model that involves an apparent permeability tensor, complemented by a dispersive term and 2) A macroscopic convection-dispersion equation for the solute, in which both the macroscopic velocity and the total dispersion tensor are influenced by the slip effects taking place at the pore-scale. The use of the model is restricted by the starting assumptions imposed in the governing equations at the pore scale and by the (spatial and temporal) constraints involved in the upscaling process. The different regimes of application of the model, in terms of the Péclet number values, are discussed as well as its extents and limitations. This new model generalizes previous attempts that only include either Knudsen or diffusive slip effects in porous media.

Published
2021
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24. QM/MM with Auxiliary DFT

Author

Samaniego-Rojas, Juan, Hernández-Segura, Luis-Ignacio, López-Sosa, Luis, Delgado-Venegas, Rogelio, Gomez, Badhin, Lambry, Jean-Christophe, de la Lande, Aurelien, Mineva, Tzonka, Alejandre, José, Zúñiga-Gutiérrez, Bernardo, Flores-Moreno, Roberto, Calaminici, Patrizia, Geudtner, Gerald, Köster, Andreas, Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV), University of Calgary, Universidad Católica de Santa María, Laboratoire d'Optique et Biosciences (LOB), École polytechnique (X)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie Physique (ICP), Institut de Chimie du CNRS (INC)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Departamento di Quimica, Universidad Autonoma Metropolitana - Iztapalapa, Universidad de Guadalajara, Dennis R. Salahub, Dongqing Wei, and Mineva, Tzonka

Subjects
deMon2k, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, [CHIM.THEO] Chemical Sciences/Theoretical and/or physical chemistry, ADFT, QM/MM
Abstract

International audience; This chapter describes the theoretical background of the quantum mechanical/molecular mechanical (QM/MM) implementation in deMon2k within the framework of auxiliary density functional theory (ADFT). It aims to give the reader an overview of the current state of the art of this QM/MM implementation and perspectives for its future development. To this end, we first derive the ADFT working equations for the QM and QM/MM energy and gradient expressions. Based on the joint QM/MM gradient expression, we present algorithms for QM/MM structure optimizations, transition-state searches and molecular dynamics simulations. The use of auxiliary density perturbation theory (ADPT) in the framework of QM/MM is discussed using illustrative implementations including analytic second-order ADFT energy derivatives, nuclear magnetic resonance chemical shift calculations and excited state calculations using time-dependent ADFT. The chapter closes with the description of a transformation program used to generate deMon2k QM/MM inputs.

Published
2021
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25. La conducta prosocial en niños y niñas de escuelas primarias

Author

Duarte Cruz, José, Voces de la educación, Voces de la educación, and Universidad Autonoma Metropolitana - Iztapalapa

Subjects
peaceful coexistence, coexistencia pacífica, bullying, prosociability, educación para la paz, acoso escolar, [SHS] Humanities and Social Sciences, education for peace, prosociabilidad, [SHS]Humanities and Social Sciences
Abstract

Summary: This research implemented a multicomponent model to promote prosocial skills and prevent school violence. It was developed in eleven marginalized elementary schools in Sonora and Chiapas. A mixed protocol was used, the quantitative phase was carried out by means of a quasi-experiment; the qualitative one resorted to participatory action research. Some results show an increase in the practice of prosocial competences in the participants; the index of student prosociability increased in both cities, and there was a reduction in school violence. The strategies affected the maintenance of cordial school climates, greater participation and cohesion, the development of empathy, assertiveness, better management of emotions and the peaceful resolution of conflicts, which in sum contributed to the improvement of educational achievement and the increase of friendship networks., Resumen: Esta investigación implementó un modelo multicomponente para promover competencias prosociales y prevenir la violencia escolar. Se desarrolló en once escuelas primarias marginadas en Sonora y Chiapas. Se utilizó un protocolo mixto, la fase cuantitativa se efectuó mediante un cuasiexperimento; la cualitativa recurrió a la investigación-acción participativa. Algunos resultados muestran un aumento en la práctica de competencias prosociales en los participantes; el índice de prosociabilidad estudiantil aumentó en ambas ciudades, y hubo una reducción en la violencia escolar. Las estrategias incidieron en el mantenimiento de climas escolares de cordialidad, mayor participación y cohesión, desarrollo de la empatía, asertividad, mejor manejo de emociones y de resolución pacífica de conflictos, lo que en suma coadyuvó a la mejora del aprovechamiento educativo y al aumento de redes de amistad.

Published
2021

30. High and energy-efficient reversible SO2 uptake by a robust Sc(<scp>iii</scp>)-based MOF

Author

J. Antonio Zárate, Eduardo González-Zamora, J. Balmaseda, Vladimir Martis, Ilich A. Ibarra, Guillaume Maurin, Daryl R. Williams, Elí Sánchez-González, Ana Martínez, Universidad Nacional Autónoma de México (UNAM), Laboratorio de Fisicoquímica y Reactividad de Superficies (LaFReS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Department of Chemical Engineering [London], Imperial College London, Departamento de Química [Mexico], Universidad Autonoma Metropolitana - Iztapalapa, Universidad Autonoma Metropolitana, Unidad Iztapalapa (UAM), and European Synchrotron Radiation Facility (ESRF)

Subjects
Ethanol, Renewable Energy, Sustainability and the Environment, Chemistry, education, fungi, 02 engineering and technology, General Chemistry, 021001 nanoscience & nanotechnology, complex mixtures, 7. Clean energy, respiratory tract diseases, High uptake, chemistry.chemical_compound, Adsorption, Chemical engineering, [CHIM]Chemical Sciences, General Materials Science, 0210 nano-technology
Abstract

International audience; The MOF-type MFM-300(Sc) is demonstrated to be an optimal adsorbent for SO2 capture combining high uptake, good stability and excellent cyclability involving a remarkable facile regeneration at room temperature. Interestingly, this MOF shows a drastic enhancement on its SO2 uptake by 40% when a small amount of ethanol is preliminary adsorbed.

Published
2019
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31. Partially Reversible H 2 S Adsorption by MFM-300(Sc): Formation of Polysulfides

Author

Gregorio Guzmán-González, J Antonio Zárate-Colín, Elí Sánchez-González, Hugo A. Lara-García, Maria Cristina Zorrilla, Vojtech Jancik, Ilich A. Ibarra, Eduardo González-Zamora, Ignacio González, Jorge Ramírez, Guillaume Maurin, Julia Aguilar-Pliego, Aída Gutiérrez-Alejandre, Jorge R Valenzuela, J. Gabriel Flores, Laboratorio de Fisicoquímica y Reactividad de Superficies (LaFReS), Universidad Nacional Autónoma de México (UNAM), Institut de Ecologia, inecol, Departamento de Ingenieria Quimica, Facultad de Quimica (UNICAT), UNAM, Departamento de Química Aplicada, Universidad Autónoma Metropolitana Azcapotzalco, Instituto de Física, Departamento de Química, Universidad Autonoma Metropolitana - Iztapalapa, CNRS, Toulouse, France, Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), and Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)

Subjects
Materials science, Hydrogen sulfide, Inorganic chemistry, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Sulfur, 0104 chemical sciences, chemistry.chemical_compound, Adsorption, Physisorption, chemistry, Chemisorption, [CHIM]Chemical Sciences, General Materials Science, Metal-organic framework, Isostructural, 0210 nano-technology, Polysulfide
Abstract

The metal-organic framework (MOF)-type MFM-300(Sc) exhibits a combined physisorption and chemisorption capture of H2S, leading to a high uptake (16.55 mmol g-1) associated with high structural stability. The irreversible chemisorbed sulfur species were identified as low-order polysulfide (n = 2) species. The isostructural MFM-300(In) was demonstrated to promote the formation of different polysulfide species, paving the way toward a new methodology to incorporate polysulfides within MOFs for the generation of novel MOF-lithium/sulfur batteries.

Published
2020
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32. Water adsorption properties of Fe(pz)[Pt(CN)4] and the Capture of CO2 and CO

Author

Eduardo González-Zamora, Juan H. González-Estefan, Brenda Alcántar-Vázquez, Daniel Alvarado-Alvarado, Hugo A. Lara-García, J. Gabriel Flores, Mathieu Gonidec, Julia Aguilar-Pliego, J. Raziel Álvarez, Ilich A. Ibarra, Alejandro Islas-Jácome, Guillaume Chastanet, Laboratorio de Fisicoquimica y Reactividad de Superficies, Universidad Nacional Autónoma de México (UNAM), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Departamento de Química Aplicada, Universidad Autónoma Metropolitana Azcapotzalco, Departamento de Química, Universidad Autonoma Metropolitana - Iztapalapa, Instituto de Física, Instituto de Ingeniería, The authors thank Dr. A. Tejeda-Cruz (powder X-ray, and IIM-UNAM) and A. Gómez-Cortés (DRIFT, IF-UNAM). CONACyT (1789) and PAPIIT UNAM (IN101517), México, are acknowledged for financial support. A.I.-J. acknowledges PRODEP-SEP (511-6/18-8354) and CONACyT-SEP CB-2017-2018 (A1-S-32582) for financial support. M.G. acknowledges (ARN-10-IDEX-03-02). E.G.-Z. thanks CONACyT (236879) for financial support. D.A.-A. thanks CONACyT for providing a scholarship (C.V. 733615). J.H.G.-E. thanks CONACyT (073096).

Subjects
Cyclohexane, 010405 organic chemistry, Coordination polymer, Organic Chemistry, Microporous material, [CHIM.MATE]Chemical Sciences/Material chemistry, 010402 general chemistry, 01 natural sciences, 0104 chemical sciences, Inorganic Chemistry, chemistry.chemical_compound, Crystallinity, Adsorption, chemistry, Chemical engineering, Physical and Theoretical Chemistry
Abstract

International audience; H2O and cyclohexane adsorption properties and the CO2 and CO capture capability of the microporous material Fe(pz)[Pt(CN)4] were examined. This 3D coordination polymer retained its crystallinity and structural stability after all adsorption–desorption experiments (demonstrated by PXRD and BET surface area). Thus, the total water uptake was equal to 14.6 wt % (8.12 mmol g–1) at 90% P/P0, and in comparison to the adsorption of cyclohexane, Fe(pz)[Pt(CN)4] demonstrated a relatively high degree of hydrophilicity. The total cyclohexane uptake of 0.28 mmol g–1, which in comparison to the total water uptake value of 8.12 mmol g–1, corroborated such hydrophilic behavior. Additionally, the CO2 capture was equal to 9.3 wt % for activated Fe(pz)[Pt(CN)4], a higher value in comparison to other lead MOFs such as NOTT-400 (4.4 wt %), despite the fact that the latter exhibits a larger BET surface area (1356 m2 g–1) than Fe(pz)[Pt(CN)4] (BET = 431 m2 g–1). When the CO2 capture capability was measured on a partially water saturated Fe(pz)[Pt(CN)4] sample, we observed a weight gain from 11.7 wt % (only water uptake) to 14.1 wt % (water + CO2). This weight increment (2.4 wt %) was attributed to the oversolubility of CO2. The CO capture on Fe(pz)[Pt(CN)4] showed a total uptake of 4.7 mmol/g after only 20 min, a result comparable to those for MOFs with much higher BET surface areas, such as MOF-74(Mg) (BET = 1957 m2 g–1; 4.4 mmol g–1). Finally, in situ DRIFT experiments exhibited the coordination of CO with open Pt(II) metal sites.

Published
2020
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45. Anomalies and gravity

Author

Mielke, Eckehard [Universidad Autonoma Metropolitana-Iztapalapa, Apartado Postal 55-534, C.P. 09340, Mexico, D.F. (Mexico)]

Published
2006
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47. Multiple dynamical resonances in a discrete neuronal model

Author

Yu, Jiang [Departamento de Fisica, Universidad Autonoma Metropolitana-Iztapalapa, Apartado Postal 55-534, 09340 Mexico, Distrito Federal (Mexico) and Programa de Ingenieria Molecular, Instituto Mexicano del Petroleo, Lazaro Cardenas 152 07730 Mexico, Distrito Federal (Mexico)]

Published
2005
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