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1Laboratoire d'Océanographie Biologique, Université de Bordeaux I, 33120 Arcachon, France
2Sanofi Recherche, Centre de Labège, F-31676 Labège, France
3Laboratoire de Biologie Cellulaire et Moléculaire, Institut National de Recherche Agronomique and Université de Bordeaux II, 33883 Villenave d'Ornon Cedex, France
5IFREMER, Centre de Brest, 29280 Plouzané, France
6Laboratoire de Microbiologie, Université des Sciences et Techniques de Saint Jéròme, F-13397 Marseille cedex 20, France
4Faculty of Science and Technology, Griffith University, Nathan, Brisbane, Australia 4111
* Corresponding author. Mailing address: Laboratoire d'Océanographie Biologique, Université de Bordeaux I, 2 rue du Pr. Jolyet, 33120 Arcachon, France. Phone: (33).56.22.39.01. Fax: (33).56.83.51.04.
ABSTRACT
Two moderately halophilic sulfate-reducing bacteria were isolated from an African oil pipeline and designated strains SEBR 3640 and SEBR 2840T (T = type strain). Both of these strains possessed traits that define the genus Desulfovibrio. The cells of both isolates were motile curved rods that had a single polar flagellum and contained desulfoviridin, and both isolates utilized lactate, pyruvate, malate, fumarate, succinate, and ethanol in the presence of sulfate. Sulfite, thiosulfate, and elemental sulfur were also used as electron acceptors in the presence of lactate. However, both strains tolerated higher concentrations of NaCI (up to 17%) than all other Desulfovibrio species except Desulfovibrio halophilus, which tolerated a similar level of NaCI. The results of a 16S rRNA gene sequence analysis also placed the designated type strain, strain SEBR 2840, in the genus Desulfovibrio but revealed that this organism was significantly different from D. halophilus and all other validly described Desulfovibrio species. On the basis of our results, we propose that strain SEBR 2840T is a member of a new species of the genus Desulfovibrio, Desulfovibrio gabonensis. The type strain of D. gabonensis is strain SEBR 2840 (= DSM 10636).
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