1887

Abstract

Three strains, designated VS-751, VS-511 and VS-732, of a strictly anaerobic, moderately halophilic, Gram-negative, rod-shaped bacterium were isolated from a highly saline (15-20%) brine from an oil reservoir in central Oklahoma, USA. The optimal concentration of NaCI for growth of these three strains was 2 M (12%), and the strains also grew in the presence of an additional 1 M MgCl. The strains were mesophilic and grew at a pH range of 6–8. Carbohydrates used by all three strains included glucose, fructose, arabinose, galactose, maltose, mannose, cellobiose, sucrose and inulin. Glucose fermentation products included ethanol, acetate, H and CO, with formate produced by two of the three strains. Differences were noted among strains in the optimal temperature and pH for growth, the maximum and minimum NaCl concentration that supported growth, substrate utilization and cellular fatty acid composition. Despite the phenotypic differences among the three strains, analysis of the 16S rRNA gene sequences and DNA-DNA hybridizations showed that these three strains were members of the same genospecies which belonged to the genus . The phenotypic and genotypic characteristics of strains VS-751, VS-511 and VS-732 are different from those of previously described species of . It is proposed that strain VS-751 (ATCC 7001031) be established as the type strain of a new species, .

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1999-07-01
2023-01-31
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