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International Journal of Systematic and Evolutionary Microbiology, Vol 50, 735-742, Copyright © 2000 by Society for General Microbiology
ARTICLES |
C Moreira, FA Rainey, MF Nobre, MT da Silva and MS da Costa
Centro de Neurociencias e Biologia Celular, Departamento de Zoologia, Universidade de Coimbra, 3004-517 Coimbra, Portugal
A bacterial isolate with an optimum growth temperature of about 55 degrees C was recovered on a medium composed of one part Kligler's iron agar and four parts of Thermus Agar from the hot spring at Sao Pedro do Sul in central Portugal. Phylogenetic analyses using the 16S rRNA gene sequence of strain SPS-1037(T) indicated that the new organism represented a new genus and species of beta-Proteobacteria. The major fatty acids of strain SPS-1037(T) are C16:0 and C17:0. Ubiquinone 8 is the major respiratory quinone, and the major polar lipids are phosphatidylethanolamine and phosphatidylglycerol. The new isolate is aerobic and chemolithoheterotrophic. Thiosulfate and tetrathionate were oxidized to sulfate. The growth yield of the organism was improved by the addition of thiosulfate to media containing organic carbon sources, but the organism did not grow autotrophically under the conditions examined. Heterotrophic growth of strain SPS-1037(T) occurs on amino acids and organic acids, but this organism does not assimilate carbohydrates. On the basis of the phylogenetic analyses, and physiological and biochemical characteristics, it is proposed that strain SPS-1037(T) represents a new genus and a new species for which the name Tepidimonas ignava is proposed.
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