88 research outputs found
Considérations sur quelques syndromes hémorragiques des bovidés
Guilhon Jean, Julou L. Considérations sur quelques syndromes hémorragiques des Bovidés. In: Bulletin de l'Académie Vétérinaire de France tome 103 n°4, 1950. pp. 185-196
Identité du syndrome hémorragique des bovidés bretons et de la Bracken-poisoning
Guilhon Jean, Julou L. Identité du syndrome hémorragique des Bovidés bretons et de la Braken-poisoning. In: Bulletin de l'Académie Vétérinaire de France tome 104 n°6, 1951. pp. 319-320
Etude histologique des lésions du syndrome hémorragique des bovidés bretons
Guilhon Jean, Drieux Henri, Gasse H., Perdrix Jean, Julou L. Ătude histologique des lĂ©sions du syndrome hĂ©morragique des BovidĂ©s bretons. In: Bulletin de l'AcadĂ©mie VĂ©tĂ©rinaire de France tome 103 n°4, 1950. pp. 181-184
Influence Ă©ventuelle de la Chlortetracycline, mĂ©langĂ©e Ă la nourriture du poulet comme adjuvant dâalimentation, sur la teneur en cholestĂ©rol des principaux organes et sur lâapparition dâathĂ©rosclĂ©rose
Dubost P., Ganter P., Julou L., Pascal S., Bressou C. Influence de la chlortĂ©-tracycline, mĂ©langĂ©e Ă la nourriture du poulet comme adjuvant dâalimentation sur la teneur en cholestĂ©rol des principaux organes et sur lâapparition dâathĂ©rosclĂ©rose. In: Bulletin de l'AcadĂ©mie VĂ©tĂ©rinaire de France tome 113 n°7, 1960. pp. 399-410
Eco-evolutionary feedbacks can rescue cooperation in microbial populations
Bacterial populations whose growth depends on the cooperative production of public goods are usually threatened by the rise of cheaters that do not contribute but just consume the common resource. Minimizing cheater invasions appears then as a necessary mechanism to maintain these populations. However, that invasions result instead in the persistence of cooperation is a prospect that has yet remained largely unexplored. Here, we show that the demographic collapse induced by cheaters in the population can actually contribute to the rescue of cooperation, in a clear illustration of how ecology and evolution can influence each other. The effect is made possible by the interplay between spatial constraints and the essentiality of the shared resource. We validate this result by carefully combining theory and experiments, with the engineering of a synthetic bacterial community in which the public compound allows survival to a lethal stress. The characterization of the experimental system identifies additional factors that can matter, like the impact of the lag phase on the tolerance to stress, or the appearance of spontaneous mutants. Our work explains the unanticipated dynamics that eco-evolutionary feedbacks can generate in microbial communities, feedbacks that reveal fundamental for the adaptive change of ecosystems at all scales
L'image sanguine dans le syndrome hémorragique observé en Bretagne, sur les jeunes bovins
Guilhon Jean, Julou L. L'image sanguine dans le syndrome hémorragique observé en Bretagne, sur les jeunes bovins. In: Bulletin de l'Académie Vétérinaire de France tome 102 n°10, 1949. pp. 407-415
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