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L'entrée monumentale de Jastres-Nord : Nouvelles perspectives sur la "clavicula" et le système de fermeture
No full textNational audienceNous présentons ici les résultats de nouvelles recherches conduites sur la porte principale des fortifications du site de Jastres-Nord (Lussas, Ardèche) construites au Ier siècle av. n. è. Les fouilles menées dans les années 1970-1990 ont mis en évidence un plan en chicane, généralement interprété comme une "clavicula", et un ensemble exceptionnel de ferrures provenant pour l’essentiel de l’incendie du système de fermeture interne. Nous proposons un réexamen des vestiges architecturaux ainsi que de nouvelles données sur la porte en bois interne du dispositif : son apparence, ses dimensions, sa structure et ses matériaux
Evolution of a trait distributed over a large fragmented population: Propagation of chaos meets adaptive dynamics
No full textWe consider a metapopulation made up of demes, each containing individuals bearing a heritable quantitative trait. Demes are connected by migration and undergo independent Moran processes with mutation and selection based on trait values. Mutation and migration rates are tuned so that each deme receives a migrant or a mutant in the same slow timescale and is thus essentially monomorphic at all times for the trait (adaptive dynamics). In the timescale of mutation/migration, the metapopulation can then be seen as a giant spatial Moran model with size that we characterize. As and physical space becomes continuous, the empirical distribution of the trait (over the physical and trait spaces) evolves deterministically according to an integro-differential evolution equation. In this limit, the trait of every migrant is drawn from this global distribution, so that conditional on its initial state, traits from finitely many demes evolve independently (propagation of chaos). Under mean-field dispersal, the value of the trait at time and at any given location has a law denoted and a jump kernel with two terms: a mutation-fixation term and a migration-fixation term involving (McKean-Vlasov equation).In the limit where mutations have small effects and migration is further slowed down accordingly, we obtain the convergence of , in the new migration timescale, to the solution of a stochastic differential equation which can be referred to as a new canonical equation of adaptive dynamics. This equation includes an advection term representing selection, a diffusive term due to genetic drift, and a jump term, representing the effect of migration, to a state distributed according to its own law
Studying the growth and morphology of metal microstructures in sodium metal batteries with ionic liquid electrolytes by operando 23Na NMR spectroscopy
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Multicenter inter‐laboratory quality control of monocyte HLA‐DR expression by flow cytometry
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Conservation of symbiotic signaling since the most recent common ancestor of land plants
No full textInternational audiencePlants have colonized lands 450 million years ago. This terrestrialization was facilitated by developmental and functional innovations. Recent evo-devo approaches have demonstrated that one of these innovations was the mutualistic arbuscular mycorrhizal symbiosis (AMS). The genetic pathways that have been involved in the establishment and functioning of AMS since its evolution remain poorly described. Here, we found that intracellular colonization by AM fungi induces a transcriptional reporter of the common symbiosis pathway, well-described in angiosperms, in the liverwort Marchantia paleacea . Mutants of either of the three main genes of this pathway, SYMRK , CCaMK, and CYCLOPS, disrupt the ability of M. paleacea to associate with AM fungi. Finally, overexpressing gain-of-function CCaMK or CYCLOPS leads to convergent transcriptomic signatures that partially overlap with AMS. Altogether, our data indicate that plants have maintained three genes of the common symbiotic pathway to support symbiotic interactions since their most recent common ancestor
Les Mères du désert à l’âge classique : une renaissance ? Angélique de Saint-Jean et la seconde génération de Port-Royal
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