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Rhodocyclaceae
The ''Rhodocyclaceae'' are a family of gram-negative bacteria.〔Garrity, George M.; Brenner, Don J.; Krieg, Noel R.; Staley, James T. (eds.) (2005). Bergey's Manual of Systematic Bacteriology, Volume Two: The Proteobacteria, Part C: The Alpha-, Beta-, Delta-, and Epsilonproteobacteria. New York, New York: Springer. ISBN 978-0-387-24145-6.〕 They are given their own order in the beta subgroup of Proteobacteria, and include many genera previously assigned to the family ''Pseudomonadaceae''.
The family contains mainly aerobic or denitrifying rod-shaped bacteria
,〔 which exhibit very versatile metabolic capabilities. Most species live in aquatic habitats and prefer oligotrophic conditions. Many, for example species of ''Zoogloea'' and ''Azoarcus'', occur in waste water and play an important role in biological remediation in waste water treatment.〔〔Martin Dworkin, Stanley Falkow, Eugene Rosenberg, Karl-Heinz Schleifer, Erko Stackebrandt: The Prokaryotes, A Handbook of the Biology of Bacteria''. Volume 5: Proteobacteria: Alpha and Beta Subclasses'' ISBN 978-0-387-25495-1〕 The name-giving genus ''Rhodocyclus'' is rather atypical for the group, being the only phototroph among them. ''Rhodocyclus'' sp. are performing anoxygenic photosynthesis under anoxic conditions in a similar way as other bacterial genera among the alpha-Proteobacteria.〔 The species ''Rhodocyclus purpureus'' also deviates from the other known members of the family (including other ''Rhodocyclus'' species) in its ring-shaped cell form, which brings the two cell poles close to each other and has inspired the genus name.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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