Vive les SVT ! Les sciences de la vie et de la Terre au collège et au lycée - Cours de SVT en ligne

Time 2021-06-17 09:26:40

Web Name: Vive les SVT ! Les sciences de la vie et de la Terre au collège et au lycée - Cours de SVT en ligne

WebSite: http://www.vivelessvt.com

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La coexistence entre phages et bactéries Une étude montre que la répartition du microbiote intestinal est à l’origine d’un équilibre biologique. La communauté bactérienne qui tapisse nos intestins fait l’objet de nombreuses recherches. Une étude de l’institut Pasteur précise la répartition des bactéries intestinales et de leurs prédateurs : les bactériophages. « Ces données nouvelles confortent un modèle écologique appelé “source-puits” dans lequel le mucus constitue En savoir plus La population d’oiseaux diminue en France Retour sur les deux études scientifiques récentes montrant la baisse significative du nombre d’oiseaux. Menées par le Muséum national d’histoire naturelle et le CNRS, ces études locales et nationales dressent un bilan sans appel : « En 17 ans, un tiers des oiseaux ont disparu des campagnes françaises ». Les causes évoquées sont l’agriculture intensive avec l’utilisation de pesticides. Le En savoir plus Des abeilles bientôt vaccinées ? Deux chercheurs de l’université de Helsinki ont mis au point une sorte de vaccin pour insecte contre une bactérie. Contre le pathogène Paenibacillus larvae qui provoque le décès de nombreuses colonies d’abeilles, deux chercheurs finlandais testent un vaccin. Les insectes ne possédant pas d’anticorps, le principe de cette vaccination consiste à faire ingérer des spores de la bactérie dans le En savoir plus Obésité infantile : les effets de la sédentarité Quelles sont les conséquences du temps passé devant les écrans sur la masse grasse corporelle ? Une étude menée par l Inserm montre un risque plus important de développement de masse grasse chez les enfants de moins de 2 ans qui passent plus de temps devant les écrans et moins de temps à jouer en plein air. La méthodologie suivie par En savoir plusLes Sciences de la Vie et de la Terre au collège et au lycée. Découverte, actualité, cours, aide et soutien en ligne. 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