Affichage des résultats 701 à 720 sur 1246 au total
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The early developmental period of an organism is a sensitive period where organisational and activational effects occur and thus, small disturbances have important and long-lasting consequences. Parents can modify, to some extent, the abiotic and biotic conditions experienced by their offspring, during both the prenatal and postnatal stages through differential behavioural and/or physiological input. In this seminar, I will focus on prenatal effects, such as litter-sex composition and maternal programming for the future environment in yellow-bellied marmots (Marmota flaviventris), a ground-dwelling sciurid rodent.
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Sexual intimidation is frequent in humans, but its evolutionary origin remain speculative because few animal studies have investigated comparable, long-term forms of sexual violence. In our study, we focused on a population of wild chacma baboons and showed that males intimidate females to mate with them, and that sexual violence is the main source of injuries for females. Aggression and matings were found to be decoupled temporally, which may explain why some forms of sexual violence have been largely overlooked in well-studied animal populations. This study suggests that long-term sexual coercion may be widespread across mammalian societies, with important implications for understanding the evolution of mate choice and sexual conflict in mammals, as well as the origins of human sexual violence.
These de Janice Kielbassa - mardi 12 octobre 2010 - Amphi Ampère
Merci de me confirmer votre présence par mail à mariethe.chaumeil@chu-lyon.fr
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Thèse de Micheline Guisérix - Mercredi 1er juillet 2009 à 14h00 - Amphi du CNRS
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Population-level effects of chemicals, for example pesticides, depend not only on exposure and toxicity but also on ecological factors. It is impossible to fully address these factors empirically. Mechanistic effect models, for example ecological models, can solve this problem. They can be used to extrapolate results from single species tests and higher tier tests to the population level and larger scales. Currently, however, there is no common framework that would allow developing such models and assessing their quality in a coherent way. The EU-funded project CREAM ("Mechanistic Effect Models for Ecological Risk Assessments of Chemicals") aims at developing and establishing such a framework. CREAM will not only focus on what Good Modelling Practice is but also on how it can be developed and established. CREAM's central approach will be to use a common framework for documenting the modelling process, dubbed TRACE (Transparent Comprehensive Modelling) documentation. TRACE provides a common structure for organizing and, at the same time, documenting the modelling process on a day-to-day basis. I will demonstrate the use of TRACE using example models. Finally, I will discuss a main further challeng of ecological modelling for chemical risk assessment: the agreement on practical but meaningful population-level endpoints.See the two regional speakers on the SEMOVI web page : http://www.cgmc.univ-lyon1.fr/Semovi/
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Habilitation à diriger des recherches de Marie Hélène Metzger - Jeudi 10 mai 2012 - 14h00 - Rockefeller
Thèse de Yoann Blangero le 13 septembre 2019 à 14 h, salle des thèses Rockefeller
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We study a poorly characterized bacterial gender of the Planctomycetes phylum, Gemmata obscuriglobus. Planctomycetes are major players in the global nitrogen and carbon cycles and are uniquely capable of anaerobic ammonium oxidation (a globally important nitrogen transformation). Within that phylum, the bacteria of the gender Gemmata are particularly interesting due to their complex intracellular membranous organization that is sustained by proteins showing similarity to the eukaryotic equivalent ones and their capability to internalize fully folded proteins in a process reminiscent of eukaryotic endocytosis (Lohnienne et al., 2010).We use a combination of computational, molecular biology, and electron-microscopy to first, decipher the peculiar biology of the Planctomycetes and second, to understand their contribution to eukaryotic origin. Computationally, we use structure to push the limits of sequence homology detection. Amongst other tools, we use protein architecture correlation to detect potential relationship between distantly related proteins (Santarella-Mellwig et al. PLoS Biol. 2010).
Thèse de Susan Higashi le mercredi 26 novembre 2014 à 14 h 30 - amphithéâtre bâtiment Paul Dirac (Doua)