A previously undescribed denitrifying bacterium was isolated from soil. The cells are small, gram negative, slightly curved rods, asporogenous, and nonmotile. Motile clones, however, have been isolated from the nonmotile parent: these cells possess a single polar flagellum. The organism shows no fermenting activity and grows only in the presence of one of the following electron acceptors: NO3-, NO2-, N2O, S4O6 and O2. It gives a positive oxidase test and has a cytochrome c and catalase. It requires no growth factors, is a chemoorganotroph, and uses only some alcohols and organic acids as carbon and energy supply. Poly-β-hydroxybutyrate is synthesized. The deoxyribonucleic acid base composition is 62.2 mol% guanine plus cytosine. The bacterium bears greatest resemblance to .


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