34 research outputs found

    Ca and Sr sorption on Ca-illite experimental study and modelling

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    International audienceTo ensure the environmental monitoring of nuclear sites, sorption models enabling the prediction of contaminant migration (such as 90Sr) in soils, sediments and aquifers needs to be developed. Recently, a multi-site ion exchanger model has been applied with success to the sorption of a contaminant on a natural soil under static and dynamic conditions. To use this sorption model for natural environments, sorption data concerning Sr and Ca on the natural clay mineral illite are necessary. Batchs experiments performed in this study enabled to collect sorption data of Ca and Sr on Ca-illite. These sorption data were modeled successfully with a multi-site ion exchanger formalism by using four sorption site concentrations. Obtained selectivity coefficients could be thereafter introduced in the multi-site ion exchanger model to describe the Sr sorption in natural environments

    Modelling of Sr reactive transport in a clayey sandstone at different scales

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    International audienceIn this study, this sorption model is coupled to the advection-dispersion equation to describe Sr reactive transport in a clayey sandstone at two different scale

    Flirts : silhouettes de jeunes filles étrangères / A. Monnier-Wissocq

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    Contient une table des matièresAvec mode text

    Microsatellite variation between an African and five European taurine breeds results in a geographical phylogenetic tree with a bison outgroup

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    The genetic relationship between five Belgian breeds (Belgian Blue, Black Pied, Red Pied, White and Red of East Flanders, Red of West Flanders), an African taurine N'Dama breed and a captive American bison herd was studied by means of 31 microsatellite loci. On the basis of the allele frequencies of the 31 scored loci, Nei's modified genetic distance was calculated between the populations. The neighbour joining clustering algorithm was used to construct a possible phylogenetic tree. Herein American bison served as an outgrouThe dendrogram displays a geographical topology with three major lineages as expected, but is unclear in clustering the local breeds
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