Guillaume Prévost

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Aquatic ecosystems are natural complex systems. They are the site of a great number of phenomena. Thus, many studies model each of these phenomena, using law-based approach (most of the time differential equations ) or rulebased approach (individual-based models in particular). Owing to their complex nature, aquatic ecosystems are hard to study and resist a(More)
Suitability ofDrosophila melanogaster larvae to their endoparasiteLeptopilina boulardi (Nordlander, 1980) shows wide genetic and epigenetic variation. Experiments were done onDrosophila isofemale lines. When reared in optimal laboratory conditions only 50 % of parasitizedDrosophila larvae gave rise to an adult wasp, and significant variation was observed(More)
In view of the variety of 3D representation techniques, a clinical study was carried out in order to evaluate their respective usefulness. It appears that a single technique cannot be claimed to be valid for all clinical situations and that a combination of representations brings more relevant information. Among the different techniques a clear delineation(More)
We propose some ways computer science can be used to help modeling in general and ecological modeling in particular, beyond numerical solving of mathematical models. More precisely we present a summary analysis of ecological modeling following two pairs of criteria (Rules vs. laws and State variables vs IBM), upon which we built an ontological computer(More)
In this paper, we present a methodology for aquatic ecosystem modeling. We based our model on the holarchic (non directional hierarchic) nature of the ecosystems. Aquatic ecosystems are crossed by structuring fluxes (light radiation, mass transport, etc.) which confer multi-level of emergent organizations. Elsewhere, a part of aquatic ecosystems are species(More)
Un homme, âgé de 53ans, était hospitalisé pour un érythème ouloureux périnéal évoluant depuis cinq jours. Ses antécédents taient principalement marqués par un diabète non insulinodéendant, une cardiopathie hypertensive et un éthylisme chronique. l’admission, l’examen clinique retrouvait une hyperthermie à 8,5◦ C, une cellulite touchant le scrotum et les(More)