1887

Abstract

Two moderately halophilic, mesophilic, sulfate-reducing bacteria were isolated from production-water samples from Emeraude Oilfield, Congo. Motile, vibrioid cells of SRL4225 grew optimally at a concentration of 4 % NaCl, at pH 5·8–6·2, with a minimal pH for growth of 5·2, showing that it is a moderately acidophilic bacterium. Cells of SRL6146 were motile, curved or vibrioid, long and thin rods. Optimal growth was obtained at a concentration of 5–6 % NaCl, at pH 6·8–7·2. The nutritional requirements showed that many of the characteristics of these strains overlap with those of known species. On the basis of 16S rRNA gene sequence analysis and DNA–DNA hybridization studies, both strains are members of the genus . However, they are not closely related to any species of the genus that have validly published names. It is therefore proposed that the two strains are members of two novel species of the genus with the names sp. nov. (type strain SRL4225=DSM 16055=ATCC BAA-903) and sp. nov. (type strain SRL6146=DSM 16080=ATCC BAA-904).

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2004-09-01
2019-12-14
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