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Two novel bacterial strains, designated Kc1T and Kc5T, were isolated from soil in Japan. Cells of the novel strains were Gram-reaction-positive, aerobic or facultatively anaerobic, motile rods. Phylogenetic analyses based on 16S rRNA gene sequences indicated that both strains belonged to the genus Cellulomonas . The 16S rRNA gene sequences of strains Kc1T and Kc5T showed closest similarity to that of Cellulomonas terrae DB5T (98.1 % and 98.4 % similarity, respectively), and the 16S rRNA gene similarity between the two novel strains was 97.8 %. In both strains, the major menaquinone was MK-9(H4), the predominant polar lipids were diphosphatidylglycerol and phosphatidylinositol mannosides, and the peptidoglycan contained ornithine and glutamic acid. Cell-wall sugars were identified as rhamnose, galactose and mannose in strain Kc1T and rhamnose and glucose in strain Kc5T. The DNA G+C contents of strains Kc1T and Kc5T were 73.6 mol% and 75.8 mol%, respectively. Based on the chemotaxonomic and physiological data and the results of DNA–DNA hybridizations, the two strains represent two novel species within the genus Cellulomonas , for which the names Cellulomonas soli sp. nov. (type strain Kc1T = DSM 24484T = JCM 17535T) and Cellulomonas oligotrophica sp. nov. (type strain Kc5T = DSM 24482T = JCM 17534T) are proposed.
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