Abstract
A slightly curved rod strictly anaerobic, thermophilic bacterium was isolated from Dagang oil field, China. Its fundamental physiology and bio-corrosion characteristic were characterized. The growth of strain CF1 occurred at 45 to 78°C (optimum 60°C), pH 5.0 to 9.5 (optimum 7.1). The doubling time under optimal conditions was 45 min. Substrates that could be used included D-cellobiose, fructose, glucose, maltose, mannose,trehalose, melezitose, raffinose, ribose, sucrose, xylose and starch. 16S rRNA gene sequence analysis indicated that the isolate was most closely related toThermoanaerobacter uzonensis (99.2%). The G+C content of the genomic DNA of strain CF1 was 33.5 mol%. The major cellular fatty acid contents were 14 : 0 (2.5%), 15 : 0 (65.8%), 16 : 0 (8.6%), 15-methyl 17:0 (8.1%), 14-methyl 17:0 (7.4%), 18 : 1v9c (1.7%) and 18 : 0 (4.8%). The strain reduced up to 1 M thiosulfate to elemental sulfur without sulfide formation. In the presence of thiosulfate, electrochemical method, weight loss and surface analysis showed the corrosion behavior of the isolate. A slight change of corrosion current was detected through electrochemical method. Elemental sulfur was found on the surface of the carbon steel, with less weight loss in the cultivation system. Key words: Thiosulfate reduction, element sulfur, bio-corrosion, carbon steel.
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