12 results on '"Márquez, N."'
Search Results
2. Phase behavior of fatty acid/oil/water systems: Effect of the alkyl length chain acid
- Author
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Bravo, B., primary, Márquez, N., additional, Ysambertt, F., additional, Chávez, G., additional, Cáceres, A., additional, Bauza, R., additional, Graciaa, A., additional, Lachaise, J., additional, and Salager, J. L., additional
- Published
- 2006
- Full Text
- View/download PDF
3. Acoustic levitation as a tool for cell-driven self-organization of human cell spheroids during long-term 3D culture.
- Author
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Rabiet L, Arakelian L, Jeger-Madiot N, García DR, Larghero J, and Aider JL
- Subjects
- Humans, Endothelial Cells, Acoustics, Extracellular Matrix, Spheroids, Cellular, Mesenchymal Stem Cells
- Abstract
Acoustic levitation, which allows contactless manipulation of micro-objects with ultrasounds, is a promising technique for spheroids formation and culture. This acoustofluidic technique favors cell-cell interactions, away from the walls of the chip, which leads to the spontaneous self-organization of cells. Using this approach, we generated spheroids of mesenchymal stromal cells, hepatic and endothelial cells, and showed that long-term culture of cells in acoustic levitation is feasible. We also demonstrated that this self-organization and its dynamics depended weakly on the acoustic parameters but were strongly dependent on the levitated cell type. Moreover, spheroid organization was modified by actin cytoskeleton inhibitors or calcium-mediated interaction inhibitors. Our results confirmed that acoustic levitation is a rising technique for fundamental research and biotechnological industrial application in the rapidly growing field of microphysiological systems. It allowed easily obtaining spheroids of specific and predictable shape and size, which could be cultivated over several days, without requiring hydrogels or extracellular matrix., (© 2024 The Authors. Biotechnology and Bioengineering published by Wiley Periodicals LLC.)
- Published
- 2024
- Full Text
- View/download PDF
4. Is it raining PFAS in France? An analysis of 52 PFAS at nanogram per liter levels in French rainwaters during autumn season.
- Author
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Berthou M, Gérard V, Pélingre M, Bagard A, Batteux TL, and Losfeld G
- Subjects
- Humans, Tandem Mass Spectrometry methods, Seasons, Chromatography, Liquid methods, France, Fluorocarbons analysis, Water Pollutants, Chemical analysis
- Abstract
Per- and polyfluoroalkyl substances (PFAS) are of increasing concern due to their pervasive nature, high persistence, and their impacts on human health and the environment. Many studies have attempted to assess the presence of PFAS along the water cycle, but few have analyzed rainwater PFAS content and its contribution to water contamination. The present study aims to improve knowledge by providing the first analysis of PFAS rainwater samples from France. A total of 52 PFAS were analyzed at nanogram per liter levels in rainwater samples collected in 14 locations in France using a cutting-edge liquid chromatography-tandem mass spectrometry (LC/MS/MS) method for multiresidue determination. Depending on the quantity of rainwater collected, the PFAS concentrations were analyzed either by direct injection or after solid-phase extraction (SPE), allowing to quantify 20 PFAS with a limit of quantification (LOQ) ≤ 100 ng/L and 52 PFAS with a LOQ ≤ 1 ng/L, respectively. For the five locations for which the collected samples were analyzed by direct injection, no PFAS could be detected (i.e., their concentrations in the samples were below the LOQs of the method). The samples from four locations out of the nine analyzed by SPE-LC/MS/MS show results above the method's LOQs for up to 10 PFAS. Among the quantified PFAS, three compounds (perfluorononanoic acid, perfluoroundecanoic acid, and perfluorohexanoic acid) have been found to be of most significance. These results bring out the presence of PFAS in rainwater samples in France, highlighting the need for PFAS environmental surveillance and risk assessment and the necessity of continuous improvement of existing analysis methods., (© 2023 Eurofins Hydrologie Est. Journal of Environmental Quality © 2023 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.)
- Published
- 2024
- Full Text
- View/download PDF
5. Germination, viability and dormancy of 47 species from threatened tropical montane grassland in southeast Brazil: Implications for ex situ conservation.
- Author
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de Andrade LG, Sánchez-Tapia A, and de Andrade ACS
- Subjects
- Brazil, Ecosystem, Grassland, Seeds, Temperature, Germination, Plant Dormancy
- Abstract
To mitigate anthropogenic impacts on plant diversity in tropical montane grasslands, one of the most threatened ecosystems in Brazil, it will be essential to develop ex situ conservation strategies to preserve wild species. The lack of basic research on the seed storage behaviour of grassland species may, however, limit their use for reintroduction and restoration projects. We investigated seed storage behaviour at the community level by comparing the effects of cold-low RH (10 °C; 10% RH) and freezing-low RH (20 °C; 10% RH) conditions on seed viability, germination and dormancy of 47 species. Fresh seeds of 43% of the species showed primary dormancy. More than half of the species showed high seed survival responses (viability >60%) under both storage temperatures. Despite a variety of dormancy responses among the different species, the low RH storage conditions tested released dormancy for most species during 12- and 30-month storage times. Multivariate analysis of the best (freezing-low RH, 30 months) storage condition evidenced the formation of five distinct groups, three with species having high conservation potential in seed banks. Although further studies are needed to test dormancy-breaking treatments and improve seed conservation practices, this first approach to assessing seed banking techniques could contribute to demand for locally adapted seeds for ecological restoration projects in tropical montane grasslands., (© 2021 German Society for Plant Sciences and The Royal Botanical Society of the Netherlands.)
- Published
- 2021
- Full Text
- View/download PDF
6. Multiphase Catalytic Reactors : Theory, Design, Manufacturing, and Applications
- Author
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Zeynep Ilsen Önsan, Ahmet Kerim Avci, Zeynep Ilsen Önsan, and Ahmet Kerim Avci
- Subjects
- Phase-transfer catalysis, Chemical reactors
- Abstract
Provides a holistic approach to multiphase catalytic reactors from their modeling and design to their applications in industrial manufacturing of chemicals Covers theoretical aspects and examples of fixed-bed, fluidized-bed, trickle-bed, slurry, monolith and microchannel reactors Includes chapters covering experimental techniques and practical guidelines for lab-scale testing of multiphase reactors Includes mathematical content focused on design equations and empirical relationships characterizing different multiphase reactor types together with an assortment of computational tools Involves detailed coverage of multiphase reactor applications such as Fischer-Tropsch synthesis, fuel processing for fuel cells, hydrotreating of oil fractions and biofuels processing
- Published
- 2016
7. DNA in Supramolecular Chemistry and Nanotechnology
- Author
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Eugen Stulz, Guido H. Clever, Eugen Stulz, and Guido H. Clever
- Subjects
- Supramolecular chemistry, DNA, Nanotechnology
- Abstract
This book covers the emerging topic of DNA nanotechnology and DNA supramolecular chemistry in its broader sense. By taking DNA out of its biological role, this biomolecule has become a very versatile building block in materials chemistry, supramolecular chemistry and bio-nanotechnology. Many novel structures have been realized in the past decade, which are now being used to create molecular machines, drug delivery systems, diagnosis platforms or potential electronic devices. The book combines many aspects of DNA nanotechnology, including formation of functional structures based on covalent and non-covalent systems, DNA origami, DNA based switches, DNA machines, and alternative structures and templates. This broad coverage is very appealing since it combines both the synthesis of modified DNA as well as designer concepts to successfully plan and make DNA nanostructures. Contributing authors have provided first a general introduction for the non-specialist reader, followed by a more in-depth analysis and presentation of their topic. In this way the book is attractive and useful for both the non-specialist who would like to have an overview of the topic, as well as the specialist reader who requires more information and inspiration to foster their own research.
- Published
- 2015
8. Introduction to Chemicals From Biomass
- Author
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James H. Clark, Fabien Deswarte, James H. Clark, and Fabien Deswarte
- Subjects
- Biomass chemicals, Organic compounds
- Abstract
Introduction to Chemicals from Biomass, Second Edition presents an overview of the use of biorenewable resources in the 21st century for the manufacture of chemical products, materials and energy. The book demonstrates that biomass is essentially a rich mixture of chemicals and materials and, as such, has a tremendous potential as feedstock for making a wide range of chemicals and materials with applications in industries from pharmaceuticals to furniture. Completely revised and updated to reflect recent developments, this new edition begins with an introduction to the biorefinery concept, followed by chapters addressing the various types of available biomass feedstocks, including waste, and the different pre-treatment and processing technologies being developed to turn these feedstocks into platform chemicals, polymers, materials and energy. The book concludes with a discussion on the policies and strategies being put in place for delivering the so-called Bioeconomy. Introduction to Chemicals from Biomass is a valuable resource for academics, industrial scientists and policy-makers working in the areas of industrial biotechnology, biorenewables, chemical engineering, fine and bulk chemical production, agriculture technologies, plant science, and energy and power generation. We need to reduce our dependence on fossil resources and increasingly derive all the chemicals we take for granted and use in our daily life from biomass – and we must make sure that we do this using green chemistry and sustainable technologies! For more information on the Wiley Series in Renewable Resources, visit www.wiley.com/go/rrs Topics covered include: • The biorefinery concept • Biomass feedstocks • Pre-treatment technologies • Platform molecules from renewable resources • Polymers from bio-based monomers • Biomaterials • Bio-based energy production Praise for the 1st edition: “Drawing on the expertise of the authors the book involves a degree of plant biology and chemical engineering, which illustrates the multidisciplinary nature of the topic beautifully” - Chemistry World
- Published
- 2015
9. Oil Spill Remediation : Colloid Chemistry-Based Principles and Solutions
- Author
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Ponisseril Somasundaran, Partha Patra, Raymond S. Farinato, Kyriakos Papadopoulos, Ponisseril Somasundaran, Partha Patra, Raymond S. Farinato, and Kyriakos Papadopoulos
- Subjects
- Oil pollution of the sea, Oil spills--Cleanup, Oil pollution of water, Emulsions
- Abstract
This book provides a comprehensive overview of oil spill remediation from the perspectives of policy makers, scientists, and engineers, generally focusing on colloid chemistry phenomena and solutions involved in oil spills and their cleanup. • First book to address oil spill remediation from the perspective of physicochemical and colloidal science • Discusses current and emerging detergents used in clean-ups • Includes chapters from leading scientists, researchers, engineers, and policy makers • Presents new insights into the possible impact of oil spills on ecosystems as well as preventive measures
- Published
- 2014
10. Natural and Artificial Photosynthesis : Solar Power As an Energy Source
- Author
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Reza Razeghifard and Reza Razeghifard
- Subjects
- Photosynthesis--Industrial applications, Renewable energy sources
- Abstract
This technical book explores current and future applications of solar power as an unlimited source of energy that earth receives every day. Photosynthetic organisms have learned to utilize this abundant source of energy by converting it into high-energy biochemical compounds. Inspired by the efficient conversion of solar energy into an electron flow, attempts have been made to construct artificial photosynthetic systems capable of establishing a charge separation state for generating electricity or driving chemical reactions. Another important aspect of photosynthesis is the CO2 fixation and the production of high energy compounds. Photosynthesis can produce biomass using solar energy while reducing the CO2 level in air. Biomass can be converted into biofuels such as biodiesel and bioethanol. Under certain conditions, photosynthetic organisms can also produce hydrogen gas which is one of the cleanest sources of energy.
- Published
- 2013
11. Stereoselective Synthesis of Drugs and Natural Products
- Author
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Vasyl Andrushko, Natalia Andrushko, Vasyl Andrushko, and Natalia Andrushko
- Subjects
- Molecular pharmacology, Stereoisomers, Chiral drugs, Drug development
- Abstract
Brings together the best tested and proven stereoselective synthetic methods Both the chemical and pharmaceutical industries are increasingly dependent on stereoselective synthetic methods and strategies for the generation of new chiral drugs and natural products that offer specific 3-D structures. With the publication of Stereoselective Synthesis of Drugs and Natural Products, researchers can turn to this comprehensive two-volume work to guide them through all the core methods for the synthesis of chiral drugs and natural products. Stereoselective Synthesis of Drugs and Natural Products features contributions from an international team of synthetic chemists and pharmaceutical and natural product researchers. These authors have reviewed the tremendous body of literature in the field in order to compile a set of reliable, tested, and proven methods alongside step-by-step guidance. This practical resource not only explores synthetic methodology, but also reaction mechanisms and applications in medicinal chemistry and drug discovery. The publication begins with an introductory chapter covering general principles and methodologies, nomenclature, and strategies of stereoselective synthesis. Next, it is divided into three parts: Part One: General Methods and Strategies Part Two: Stereoselective Synthesis by Bond Formation including C-C bond formation C-H bond formation C-O bond formation C-N bond formation Other C-heteroatom formation and other bond formation Part Three: Methods of Analysis and Chiral Separation References in every chapter serve as a gateway to the literature in the field. With this publication as their guide, chemists involved in the stereoselective synthesis of drugs and natural products now have a single, expertly edited source for all the methods they need.
- Published
- 2013
12. Functionalization of 3-Iridacyclopentenes
- Author
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Universidad de Sevilla. Departamento de Química Inorgánica, Ministerio de Economía y Competitividad (MINECO). España, Junta de Andalucía, Gómez González, Margarita, Rendón Márquez, Nuria, Álvarez González, Eleuterio, Mereiter, Kurt, López Poveda, Manuel, Paneque Sosa, Margarita, Wolffrearrangement, Universidad de Sevilla. Departamento de Química Inorgánica, Ministerio de Economía y Competitividad (MINECO). España, Junta de Andalucía, Gómez González, Margarita, Rendón Márquez, Nuria, Álvarez González, Eleuterio, Mereiter, Kurt, López Poveda, Manuel, Paneque Sosa, Margarita, and Wolffrearrangement
- Abstract
Members of a series of iridacyclopentenes of composition [TpMe2Ir(k2-C,C-CH2CR′=CRCH2)(CO)] (TpMe2=hydrotris(3,5-dimethylpyrazolyl)borate; R=R′=H, 1; R=Me, R′=H, 2; R=R′=Me, 3) have been subjected to common organic chemistry procedures for hydrogenation, cyclopropanation, epoxidation, water addition through hydroboration, cis-dihydroxylation, and ozonolysis. The stability of metallacycles 1–3, imparted by the presence of the co-ligands TpMe2 and CO, directs the reactivity towards the C=C double bonds, and furthermore the stereochemistry of the products formed is strongly dictated by the steric demands of the TpMe2 ligand. While the products obtained in some of the above-mentioned reactions are the expected ones from an organic chemistry point of view, in other cases the results differ from the outcomes of similar reactions carried out with the all-carbon counterparts.
- Published
- 2017
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