Five new strains of yellow-pigmented, gram-negative, motile, hydrogen-oxidizing bacteria were isolated; each served as a host for simultaneously isolated bacteriophages. These isolates and two additional strains were compared with other gram-negative, hydrogen-oxidizing bacteria with respect to morphology; nutritional and biochemical properties; growth parameters; cytochrome content; pigment production; susceptibility to bacteriophages, bacteriostatic agents, and antibiotics; deoxyribonucleic acid base composition; and deoxyribonucleic acid-deoxyribonucleic acid homology. Six of the strains were characterized by a high degree of interstrain similarity and were found to be related to However, due to basic differences between these strains and , the former are regarded as comprising a new species for which, because of its moderate relationship to , the name is proposed. The type strain of , GA3, has been deposited with the Deutsche Sammlung von Mikroorganismen in Göttingen under the number DSM 1034.


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