Lineages Evolution Analysis of Sulfate-reducing Bacteria in the Corrosion Biofilm

Abstract:

A new thermophilic, acidityphilic, sulfate-reducing heterotrophic bacteria, strain CW-04, was isolated from biofilm dirtiness in pipeline wall after press pump of affusion system in oilfield. The bacterium is an concurrently anaerobic, non-motile, Gram-positive, pole flagellum, spore-forming curved rod growing within a pH range of 3.7~10(optimal growth at pH 6~6.5) and temperature range of 20℃~63℃(optimal growth at 47℃), then, growth curve was studied to efficiently prevent corrosion. The optimum NaCl concentration for growth is 0.7%. A limited number of compounds are utilized as electron donors, including H2+acetate, formate, acetate, lactate, propionate, pyruvate and ethanol. Sulfate, sulfite and thiosulfate, but not sulfer or nitrate, can be used as electron acceptors. Strain CW-04 is able to utilize glucose, fructose and simple aminophenol as sources of carbon. Analysis of the 16S rDNA sequence allowed strain CW-04(accession numbers: AY703033) to be classified as a representative of a new strain of the genus Desulfotomaculum, Desulfotomaculum aeronauticumd (Bacteria, Firmicutes, Clostridia, Clostridiales, Pep-tococcaceae) whose similarity is 99%.