排序方式: 共有25条查询结果,搜索用时 15 毫秒
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Olivier Maurin Artemis Anest Sidonie Bellot Edward Biffin Grace Brewer Tristan Charles-Dominique Robyn S. Cowan Steven Dodsworth Niroshini Epitawalage Berta Gallego Augusto Giaretta Renato Goldenberg Deise J.P. Gonçalves Shirley Graham Peter Hoch Fiorella Mazine Yee Wen Low Catherine McGinnie Fabián A. Michelangeli Sarah Morris Darin S. Penneys Oscar Alejandro Pérez Escobar Yohan Pillon Lisa Pokorny Gustavo Shimizu Vanessa G. Staggemeier Andrew H. Thornhill Kyle W. Tomlinson Ian M. Turner Thais Vasconcelos Peter G. Wilson Alexandre R. Zuntini William J. Baker Félix Forest Eve Lucas 《American journal of botany》2021,108(7):1087-1111
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Impact of Prunus serotina invasion on understory functional diversity in a European temperate forest
Olivier Chabrerie Jérôme Loinard Sidonie Perrin Robert Saguez Guillaume Decocq 《Biological invasions》2010,12(6):1891-1907
We investigated the relationships between the overstory dominance of Prunus serotina, and the functional diversity of the understory plant communities, in a managed European forest. Vegetation, habitat characteristics and disturbance history were surveyed in 32 invaded stands vs. 32 paired uninvaded stands, after a random stratification. Community specialization and functional diversity indices were compared and a RLQ analysis was run to link species traits to environmental variables. The herb layer of invaded stands exhibited significantly more specialist species and a lower trait diversity compared to uninvaded stands, with respect of species richness and vegetation cover. Light arrival to the forest floor and soil properties explained most of the variation in the RLQ analysis, but 20% of the variation strongly correlated with P. serotina dominance and associated disturbances. Traits characterizing shade-tolerant, short-living ruderals and shade-avoiders (vernal geophytes) were significantly associated to invaded stands, while those associated to light-demanding graminoids characterized uninvaded stands. The establishment of functionally close species (seedlings and saplings of native woody species) tended to be lower in invaded stands. We concluded that the invader was becoming the new ecosystem engineer, first by inducing trait convergence and community specialization, thus promoting traits that enable species to capture resources in the new environment it was creating, and second by reducing the grain of local heterogeneities. 相似文献
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Abstract The kinetic analysis of citrate uptake in growing cells of Lactococcus lactis subsp. lactis biovar. diacetylactis identified a proton-dependent transport and suggested the divalent anionic species as the form of citrate transported across cell membranes. The reaction followed Michaelis-Menten kinetics for a two-substrate reaction. The limiting steps were the formation of the ternary complex and the rate of transport. Temperature modified the activity of the permease, increasing the uptake rate. 相似文献
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Anokwuru Chinedu P. Makolo Felix L. Sandasi Maxleene Tankeu Sidonie Y. Elisha Ishaku L. Agoni Clement Combrinck Sandra Viljoen Alvaro 《Phytochemistry Reviews》2022,21(5):1523-1547
Phytochemistry Reviews - Cannabigerol (CBG) is one of the major phytocannabinoids present in Cannabis sativa L. but is presumed to be an artefact or degradation product of cannabigerolic acid... 相似文献
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Sidonie Broch Hélène Hénon Anne-Laure Debaud Marie-Laure Fogeron Nathalie Bonnefoy-Bérard Fabrice Anizon Pascale Moreau 《Bioorganic & medicinal chemistry》2010,18(19):7132-7143
The synthesis of non-peptidic helix mimetics based on a trimeric quinoline scaffold is described. The ability of these new compounds, as well as their synthetic dimeric intermediates, to bind to various members of the Bcl-2 protein anti-apoptotic group is also evaluated. The most interesting derivative of this new series (compound A) inhibited Bcl-xL/Bak, Bcl-xL/Bax and Bcl-xL/Bid interactions with IC50 values around 25 μM. 相似文献
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Elsheikh A Lavergne SN Castrejon JL Farrell J Wang H Sathish J Pichler WJ Park BK Naisbitt DJ 《Journal of immunology (Baltimore, Md. : 1950)》2010,185(11):6448-6460
Recognition of drugs by immune cells is usually explained by the hapten model, which states that endogenous metabolites bind irreversibly to protein to stimulate immune cells. Synthetic metabolites interact directly with protein-generating antigenic determinants for T cells; however, experimental evidence relating intracellular metabolism in immune cells and the generation of physiologically relevant Ags to functional immune responses is lacking. The aim of this study was to develop an integrated approach using animal and human experimental systems to characterize sulfamethoxazole (SMX) metabolism-derived antigenic protein adduct formation in immune cells and define the relationship among adduct formation, cell death, costimulatory signaling, and stimulation of a T cell response. Formation of SMX-derived adducts in APCs was dose and time dependent, detectable at nontoxic concentrations, and dependent on drug-metabolizing enzyme activity. Adduct formation above a threshold induced necrotic cell death, dendritic cell costimulatory molecule expression, and cytokine secretion. APCs cultured with SMX for 16 h, the time needed for drug metabolism, stimulated T cells from sensitized mice and lymphocytes and T cell clones from allergic patients. Enzyme inhibition decreased SMX-derived protein adduct formation and the T cell response. Dendritic cells cultured with SMX and adoptively transferred to recipient mice initiated an immune response; however, T cells were stimulated with adducts derived from SMX metabolism in APCs, not the parent drug. This study shows that APCs metabolize SMX; subsequent protein binding generates a functional T cell Ag. Adduct formation above a threshold stimulates cell death, which provides a maturation signal for dendritic cells. 相似文献
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Genetic ablation of polysialic acid causes severe neurodevelopmental defects rescued by deletion of the neural cell adhesion molecule 总被引:2,自引:0,他引:2
Weinhold B Seidenfaden R Röckle I Mühlenhoff M Schertzinger F Conzelmann S Marth JD Gerardy-Schahn R Hildebrandt H 《The Journal of biological chemistry》2005,280(52):42971-42977
Poly-alpha2,8-sialic acid (polySia) is a unique modification of the neural cell adhesion molecule, NCAM, tightly associated with neural development and plasticity. However, the vital role attributed to this carbohydrate polymer has been challenged by the mild phenotype of mice lacking polySia due to NCAM-deficiency. To dissect polySia and NCAM functions, we generated polySia-negative but NCAM-positive mice by simultaneous deletion of the two polysialyltransferase genes, St8sia-II and St8sia-IV. Beyond features shared with NCAM-null animals, a severe phenotype with specific brain wiring defects, progressive hydrocephalus, postnatal growth retardation, and precocious death was observed. These drastic defects were selectively rescued by additional deletion of NCAM, demonstrating that they originate from a gain of NCAM functions because of polySia deficiency. The data presented in this study reveal that the essential role of polySia resides in the control and coordination of NCAM interactions during mouse brain development. Moreover, this first demonstration in vivo that a highly specific glycan structure is more important than the glycoconjugate as a whole provides a novel view on the relevance of protein glycosylation for the complex process of building the vertebrate brain. 相似文献
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Expression of olfactory receptors in the cribriform mesenchyme during prenatal development 总被引:1,自引:0,他引:1
Schwarzenbacher K Fleischer J Breer H Conzelmann S 《Gene expression patterns : GEP》2004,4(5):543-552
Olfactory receptors (ORs) are expressed in sensory neurons of the nasal epithelium, where they are supposed to be involved in the recognition of suitable odorous compounds and in the guidance of outgrowing axons towards the appropriate glomeruli in the olfactory bulb. During development, some olfactory receptor subtypes have also been found in non-sensory tissues, including the cribriform mesenchyme between the prospective olfactory epithelium and the developing telencephalon, but it is elusive if this is a typical phenomenon for ORs. Monitoring the onset and time course of expression for several receptor subtypes revealed that 'extraepithelial' expression of ORs occurs very early and transiently, in particular between embryonic stages E10.25 and E14.0. In later stages, a progressive loss of receptor expressing cells was observed. Molecular phenotyping demonstrated that the receptor expressing cells in the cribriform mesenchyme co-express key elements, including Galpha(olf), ACIII and OMP, characteristic for olfactory neurons in the nasal epithelium. Studies on transgenic OMP/GFP-mice showed that 'extraepithelial' OMP/GFP-positive cells are located in close vicinity to axon bundles projecting from the nasal epithelium to the presumptive olfactory bulb. Moreover, these cells are primarily located where axons fasciculate and change direction towards the anterior part of the forebrain. 相似文献
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Oscar Alejandro Pérez-Escobar Steven Dodsworth Diego Bogarín Sidonie Bellot Juan A. Balbuena Rowan J. Schley Izai A. Kikuchi Sarah K. Morris Niroshini Epitawalage Robyn Cowan Olivier Maurin Alexandre Zuntini Tatiana Arias Alejandra Serna-Sánchez Barbara Gravendeel Maria Fernanda Torres Jimenez Katharina Nargar Guillaume Chomicki Mark W. Chase Ilia J. Leitch Félix Forest William J. Baker 《American journal of botany》2021,108(7):1166-1180