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3 results on '"The World Academy of Sciences"'

1. A new class of DyIII-SIMs associated with a guanidine-based ligand

Author

Jinkui Tang, Frédéric Gendron, Xiao-Lei Li, Basharat Ali, Boris Le Guennic, Chinese Academy of Sciences [Changchun Branch] (CAS), Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), 21871247, National Natural Science Foundation of China, ZDBS-LY-SLH023, Key Research Program of Frontier Science, Chinese Academy of Sciences, NA160075, Royal Society, The World Academy of Sciences, Chinese Academy of Sciences, Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)

Subjects
Field (physics), 010405 organic chemistry, Ligand, Intermolecular force, 010402 general chemistry, 01 natural sciences, 0104 chemical sciences, Inorganic Chemistry, Solvent, chemistry.chemical_compound, Dodecahedron, Crystallography, Pentagonal bipyramidal molecular geometry, chemistry, Molecule, [CHIM.COOR]Chemical Sciences/Coordination chemistry, Guanidine
Abstract

International audience; A family of four mononuclear DyIII complexes of the guanidine-based ligand L [L = tris(2-hydroxybenzylidene)triaminoguanidine] with formulas [DyLCl2(DMF)2]·DMF·CH3OH (1), [DyL2(CH3OH)2]Br·H2O·3CH3OH (2), [DyL2(H2O)2]SCN·3H2O·CH3OH (3) and [DyL2(CH3OH)2]SCN·CH3CN·CH3OH (4) were successfully prepared by varying reaction conditions. Complex 1 is seven-coordinate, with three N2O from ligand L along with two equatorially trapped DMF molecules and two axial Cl- anions, adopting pentagonal bipyramidal D5h symmetry. Complexes 2-4 have somewhat similar structures with six donor N4O2 sites from two ligands and two O from corresponding solvent molecules, featuring a N4O4 octa-coordinate environment with triangular dodecahedron D2d symmetry. Magnetic investigations indicated that complex 1 did not demonstrate single-molecule magnetic behavior, while complexes 2-4 were single-ion magnets (SIMs) under zero applied DC field with the effective energy barriers (Ueff) of 207.3 (2), 222.5 (3) and 311.7 K (4), respectively. The different types of coordinated solvent molecules and counter anions caused changes in intermolecular interactions and coordination geometries that severely affected their magnetic dynamics. The magnetic behaviors of these complexes were investigated through complete-active space self-consistent field (CASSCF) calculations with the inclusion of spin-orbit effects. Calculations revealed that the measured differences in magnetic behaviors originated mainly from intermolecular and crystal-packing effects as isolated complexes 1-4 have almost identical electronic and magnetic properties.

Published
2021
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2. Symptom evolution following the emergence of maize streak virus

Author

Anders Kvarnheden, Rémy Froissart, Shane L. Murray, Arvind Varsani, Daphné Linderme, Elham Yazdkhasti, Penelope Hartnady, Lara Donaldson, Darren P. Martin, Edward P. Rybicki, Betty E. Owor, Marc A. Suchard, Adérito Luis Monjane, Philippe Roumagnac, Philippe Lemey, Gordon William Harkins, Simon Dellicour, Kehinde A. Oyeniran, Pierre Lefeuvre, Rizwan A Syed, Marion Bezuidenhout, Dionne N. Shepherd, Norwegian Veterinary Institute [Oslo], Department of Plant Biology, Swedish University of Agricultural Sciences (SLU), Catholic University Leuven, Université libre de Bruxelles (ULB), University of Cape Town, Makerere University [Kampala, Ouganda] (MAK), Peuplements végétaux et bioagresseurs en milieu tropical (UMR PVBMT), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Université de La Réunion (UR), Du gène à l'écosystème (MIVEGEC-GeneSys), Pathogènes, Environnement, Santé Humaine (EPATH), Maladies infectieuses et vecteurs : écologie, génétique, évolution et contrôle (MIVEGEC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Maladies infectieuses et vecteurs : écologie, génétique, évolution et contrôle (MIVEGEC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud]), Biologie et Génétique des Interactions Plante-Parasite (UMR BGPI), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-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), University of the Western Cape (UWC), University of California [Los Angeles] (UCLA), University of California (UC), The Biodesign Center for Fundamental and Applied Microbiomics, Center for Evolution and Medicine, School of Life Sciences, Arizona State University [Tempe] (ASU), Svenska Institutet : 00448/2014, Fonds de la Recherche Scientifique - FNRS, FWO, National Research Foundation - South Africa, World Academy of Sciences, European Union (EU), Conseil Regional de La Reunion, Centre de Cooperation Internationale en Recherche Agronomique pour le Developpement, National Research Foundation - South Africa : TTK1207122745, European Union (EU) : PIOF-GA-2013-622571, European Research Council (ERC) : 725422, FWO : G066215N G0D5117N G0B9317N, Research Council of Norway : 267978/E40, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut national d’études supérieures agronomiques de Montpellier (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)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), University of the Western Cape, and University of California

Subjects
0106 biological sciences, 0301 basic medicine, Évolution maligne, Résistance génétique, viruses, virus de la striure du maïs, maize, 01 natural sciences, F30 - Génétique et amélioration des plantes, Immunologie, Genotype, Maize streak virus, 2.2 Factors relating to the physical environment, pathogenicity, evolutionary trade-off, Aetiology, Biology (General), Pathogen, 2. Zero hunger, Genetics, biology, Phylogenetic tree, Transmission (medicine), General Neuroscience, Microbiology and Parasitology, General Medicine, Sciences bio-médicales et agricoles, Microbiologie et Parasitologie, Virus, Infectious Diseases, [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology, Host-Pathogen Interactions, Plant Necrosis and Chlorosis, Medicine, Infection, Research Article, Evolution, QH301-705.5, Pouvoir pathogène, Science, chlorosis, Virulence, Relation hôte pathogène, virus, 010603 evolutionary biology, Zea mays, General Biochemistry, Genetics and Molecular Biology, Evolution, Molecular, 03 medical and health sciences, Transmission des maladies, H20 - Maladies des plantes, Plant Diseases, Evolutionary Biology, Géminivirus striure du maïs, General Immunology and Microbiology, Host (biology), Chlorose, evolutionary biology, Neurosciences cognitives, Molecular, biology.organism_classification, Maize, virulence, 030104 developmental biology, Biochemistry and Cell Biology, Microbiologie et protistologie [bacteriol.virolog.mycolog.]
Abstract

For pathogens infecting single host species evolutionary trade-offs have previously been demonstrated between pathogen-induced mortality rates and transmission rates. It remains unclear, however, how such trade-offs impact sub-lethal pathogen-inflicted damage, and whether these trade-offs even occur in broad host-range pathogens. Here, we examine changes over the past 110 years in symptoms induced in maize by the broad host-range pathogen, maize streak virus (MSV). Specifically, we use the quantified symptom intensities of cloned MSV isolates in differentially resistant maize genotypes to phylogenetically infer ancestral symptom intensities and check for phylogenetic signal associated with these symptom intensities. We show that whereas symptoms reflecting harm to the host have remained constant or decreased, there has been an increase in how extensively MSV colonizes the cells upon which transmission vectors feed. This demonstrates an evolutionary trade-off between amounts of pathogen-inflicted harm and how effectively viruses position themselves within plants to enable onward transmission., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2020
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3. Organic carbon transfers in the subtropical Red River system (Viet Nam): insights on CO2 sources and sinks

Author

Gilles Billen, Sylvain Huon, Josette Garnier, Thi Phuong Quynh Le, Huong Thi Mai Nguyen, Quoc Long Pham, Emma Rochelle-Newall, Vietnam Academy of Science and Technology (VAST), Institut d'écologie et des sciences de l'environnement de Paris (iEES Paris), Institut National de la Recherche Agronomique (INRA)-Sorbonne Université (SU)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Milieux Environnementaux, Transferts et Interactions dans les hydrosystèmes et les Sols (METIS), École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), NAFOSTED-Vietnam [105.09-2012.10], Asian Pacific Network [ARCP2014_03CMY_Quynh], UMR METIS, UMR iEES-Paris, World Academy of Sciences [16-096 RG/CHE/AS_ I], French Research Institute for Development (IRD), Institut d'écologie et des sciences de l'environnement de Paris (IEES (UMR_7618 / UMR_D_242 / UMR_A_1392 / UM_113) ), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Sorbonne Université (SU)-Institut National de la Recherche Agronomique (INRA), Institute of Natural Product Chemistry, Vietnam Academy of Science and Technology, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and École pratique des hautes études (EPHE)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Watershed, 010504 meteorology & atmospheric sciences, [SDV]Life Sciences [q-bio], Population, Drainage basin, 010501 environmental sciences, 01 natural sciences, C metabolism, Dissolved organic carbon, Environmental Chemistry, Point and diffuse sources, education, Organic carbon, 0105 earth and related environmental sciences, Earth-Surface Processes, Water Science and Technology, Total organic carbon, Hydrology, education.field_of_study, geography, geography.geographical_feature_category, Sub-tropical watershed modeling, Primary production, 15. Life on land, 6. Clean water, Leaching model, 13. Climate action, [SDE]Environmental Sciences, Environmental science, Surface runoff
Abstract

International audience; The Red River, draining a 169,000 km(2) watershed, is the second largest river in Viet Nam and constitutes the main source of water for a large percentage of the population of North Viet Nam. Here we present the results of an investigation into the spatial distribution and temporal dynamics of particulate and dissolved organic carbon (POC and DOC, respectively) in the Red River Basin. POC concentrations ranged from 0.24 to 5.80 mg C L-1 and DOC concentrations ranged from 0.26 to 5.39 mg C L-1. The application of the Seneque/Riverstrahler model to monthly POC and DOC measurements showed that, in general, the model simulations of the temporal variations and spatial distribution of organic carbon (OC) concentration followed the observed trends. They also show the impact of high population densities (up to 994 inhab km(-2) in the delta area) on OC inputs in surface runoff from the different land use classes and from urban point sources. A budget of the main fluxes of OC in the whole river network, including diffuse inputs from soil leaching and runoff and point sources from urban centers, as well as algal net primary production and heterotrophic respiration was established using the model results. It shows the predominantly heterotrophic character of the river system and provides an estimate of CO2 emissions from the river of 330 Gg C year(-1). This value is in reasonable agreement with the few available direct measurements of CO2 fluxes in the downstream part of the river network.

Published
2018
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