Abstract
Rho.do' bi.um . Gr. n. rhodon the rose; Gr. n. bios life; M.L. n. Rhodobium red life. Proteobacteria / Alphaproteobacteria / Rhizobiales / Rhodobiaceae / Rhodobium Cells are ovoid to rod shaped , motile by means of polar, subpolar or randomly distributed flagella; and cells multiply by budding and asymmetric cell division. Rosette formation is rare. Gram negative and belong to the Alphaproteobacteria . Phototrophically grown cells contain internal photosynthetic membranes as lamellar stacks parallel to the cytoplasmic membrane . Photosynthetic pigments are bacteriochlorophyll a and carotenoids of the spirilloxanthin series. Straight‐chain saturated and monounsaturated C 18 : 1 and C 18: 0 are the major components of cellular fatty acids, with the former being predominant . Ubiquinones and menaquinones with 10 isoprene units ( Q‐10 and MK‐10 ) are present as major quinones . The mol % G + C of the DNA is : 61.5–65.7. Type species : Rhodobium orientis Hiraishi, Urata and Satoh 1995d, 230.
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