In the past workers have isolated several pseudomonad strains which have been used for studies of anaerobic aromatic metabolism. The best studied of these strains are strains KB 740(T = type strain) and K172. The taxonomic positions of these two organisms were determined by classical methods, including experiments to determine substrate spectrum, quinone type, and total fatty acid composition. Our results clearly excluded these strains from the authentic genus , which belongs to the gamma subclass of the . Instead, the properties of these organisms indicated that they belong to the beta subclass of the . The sequences of the 16S ribosomal DNA genes confirmed this conclusion and indicated that strain K 172represents a new species of the genus , and that strain KB 740represents a new species of the genus .


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