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, b) Effets sur les activités enzymatiques .. c) Effets sur les acides nucléiques 2.4.3. Mécanismes de résistance au cadmium ... a) Les exopolymères protègent les bactéries vis à vis des métaux b) Ltaccommodation c) La synthèse de métallothionéines ou pièges à cadmium, Mécanismes de toxicité du cadmium chez les bactéries a) Effets sur les membranes d) Formation de complexes du cadmium insolubles ... e) Certaines bactéries résistent aux métaux parce qutelles accumulent moins f) Certaines bactéries volatilisent le cadmium en méthyle de cadmium

M. Et-methodes,

, Souches bactériennes et milieux de culture 3.2. Courbes de croissance

. Microscopie-Électronique,

. Respirométrie,

. Dosage-des-hexosamines,

, Dosage des exopolysaccharides

, Blocage des groupements carboxyles

N. ,

, 10

, Dosages du cadmium 3.12

, RESULTATS

, Cinétiques d'accumulation du cadmium par P. fïuorescens

, Effets du cadmium sur la croissance de P. fluorescens en milieu liquide

, Recherche drun P. fluorescens, vol.47, p.48

, Effet de la température ... b) Influence des inhibiteurs métaboliques ... c) Complexation du cadmium par les inhibiteurs méta- boliques d) Détermination de I'influence des éléments nutritifs sur lraccumulation du cadmium par les

, Rôle des exopolysaccharides dans I'accumulation et la toxicité du cadmium chez K

, Rôle des enveloppes bactériennes dans I'accumulation et la toxicité du cadmium chez P. fLuorescens et A

, Rôle des groupemeÀts carboxyles dans lraccumulation et la toxicité du cadmium chez P

, Y-a-ttil un processus actif draccumulation du cadmium chez les bactéries ?

-. .. , Où s'exprime la toxicité du cadmium

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