A new member of the genus , which utilizes thiosulfate as the electron donor and CO as the carbon source, was isolated from a sediment sample dominated by the filamentous sulfur bacterium . Although the physiological properties investigated are nearly identical to other described species of the genus, it is proposed that strain Ch-1is a member of new species, sp. nov., on the basis of differences in genotypic characteristics (16S rRNA sequence, DNA homology, G+C content). Strain Ch-1was highly motile with a slight tendency to form aggregates in the stationary growth phase. The organism was obligately autotrophic and strictly aerobic. Nitrate was not used as an electron acceptor. Chemolithoautotrophic growth was observed with thiosulfate, tetrathionate, sulfur and sulfide. The isolate was not able to grow heterotrophically. Growth of strain Ch-1was observed between pH 5·3 and 8·5 with an optimum at pH 7·0. The temperature range for growth was between 3·5 and 42 °C; the optimal growth temperature was between 32 and 37°C. The mean maximum growth rate on thiosulfate was 0·4 h. This is the second species described that has a rodshaped morphology; therefore discrimination between vibrio-shaped and is no longer valid.


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