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© Institut Pasteur/Antoinette Ryter
Salmonella spp. Bactéries à Gram négatif, aérobies ou anaérobies facultatifs à transmission orofécale. Les salmonelles majeures (sérotype typhi et sérotype paratyphi) sont responsables des fièvres typhoïde et paratyphoïde chez l'homme uniquement ; les salmonelles mineures (sérotype typhimurium et sérotype enteritidis) sont impliquées dans 30 à 60 % des gastroentérites et toxiinfections d'origine alimentaire. Image colorisée.
Publication : Applied and environmental microbiology

Isolation and genetic analysis of Chlamydomonas reinhardtii strains resistant to cadmium.

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Applied and environmental microbiology - 01 Jul 1990

Collard JM, Matagne RF

Link to Pubmed [PMID] – 2389932

Appl Environ Microbiol 1990 Jul; 56(7): 2051-5

In Chlamydomonas reinhardtii, cadmium induces reduction of growth, reduction of chlorophyll content, and lethality. The toxicity was higher in a cell wall-deficient strain than in the wild type. By growing the cells on agar medium containing cadmium at concentrations inducing high lethality, stable resistant clones were isolated. The resistance was due to a nuclear mutation (cadAR) which probably preexisted in the wild-type cell population, as suggested by the fluctuation test. A double mutant (cadAR cadBR) was selected on media containing higher concentrations of cadmium. The cadBR mutation, which is unlinked to cadAR, determines a resistance intermediate between the CadAR mutant and the wild-type strain. Both cadAR and cadBR mutations are partially dominant.