1887

Abstract

An obligately thermophilic, chemolithotrophic, microaerophilic bacterium, designated strain GBS1, was isolated from the water column of Great Boiling Spring, Nevada, USA. Thiosulfate was required for growth. Although capable of autotrophy, growth of GBS1 was enhanced in the presence of acetate, peptone or Casamino acids. Growth occurred at 70–85 °C with an optimum at 80 °C, at pH 6.50–7.75 with an optimum at pH 7.25, with 0.5–8 % oxygen with an optimum at 1–2 % and with ≤ 200 mM NaCl. The doubling time under optimal growth conditions was 1.3 h, with a final mean cell density of 6.2 ± 0.5 × 10 cells ml. Non-motile, rod-shaped cells 1.4–2.4 × 0.4–0.6 μm in size occurred singly or in pairs. The major cellular fatty acids (>5 % of the total) were Cω9, C, C and C. Phylogenetic analysis of the GBS1 16S rRNA gene sequence indicated an affiliation with and other species of the genus , but determination of 16S rRNA gene sequence similarity ( ≤ 97.10 %) and estimated DNA–DNA hybridization values ( ≤ 18.4 %) with the type strains of recognized species indicate that the novel strain is distinct from described species. Based on phenotypic, genotypic and phylogenetic characteristics, a novel species, sp. nov., is proposed, with GBS1 ( = JCM 19133 = DSM 27162) as the type strain.

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2015-12-01
2024-03-28
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