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''Cupriavidus metallidurans'' strain CH34, (renamed from ''Ralstonia metallidurans''〔 〕 and previously known as ''Ralstonia eutropha'' and ''Alcaligenes eutrophus''〔 〕) is a nonspore-forming, Gram-negative bacterium which is adapted to survive several forms of heavy metal stress.〔 〕〔 〕 Therefore, it is an ideal subject to study heavy metal disturbance of cellular processes. This bacterium shows a unique combination of advantages not present in this form in other bacteria. * Its genome has been fully sequenced (preliminary, unnotated sequence data were obtained from the DOE Joint Genome Institute) * It is not pathogenic, therefore, models of the cell can also be tested in artificial environments similar to its natural habitats. * It is related to the plant pathogen ''Ralstonia solanacearum''. * It is of ecological importance since related bacteria are predominant in mesophilic heavy metal-contaminated environments.〔〔 〕 * It is of industrial importance and used for heavy metal remediation and sensing.〔 * It is an aerobic chemolithoautotroph, facultatively able to grow in a mineral salts medium in the presence of H2, O2, and CO2 without an organic carbon source.〔 〕 The energy-providing subsystem of the cell under these conditions is composed only of the hydrogenase, the respiratory chain, and the F1F0-ATPase. This keeps this subsystem simple and clearly separated from the anabolic subsystems that starts with the Calvin cycle for CO2-fixation. * It is able to degrade xenobiotics even in the presence of high heavy metal concentrations.〔 〕 * Finally, strain CH34 is adapted to the outlined harsh conditions by a multitude of heavy-metal resistance systems that are encoded by the two indigenous megaplasmids pMOL28 and pMOL30 on the bacterial chromosome(s).〔〔〔 〕 Also it plays a vital role, together with the species ''Delftia acidovorans'', in the formation of gold nuggets, by precipitating metallic gold from a solution of gold (III) chloride, a compound highly toxic to most other microorganisms.〔 〕 〔 (Superman-Strength Bacteria Produce 24-Karat Gold ) 〕 〔 (The bacteria that turns toxic chemicals into pure gold ) 〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cupriavidus metallidurans」の詳細全文を読む スポンサード リンク
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