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Desulfovibrio A genus of bacteria which is not assigned to a taxonomic family. The cells are Gram-negative, rod-shaped, curved, and motile with flagella at one end. They are chemo-organotrophic or mixotrophic and can grow only in the absence of air. Energy is obtained by the oxidation of inorganic compounds with the concomitant reduction of sulphate (and other inorganic sulphur compounds) to sulphide. Desulfovibrio species are found in aquatic environments, waterlogged soils, etc.; they produce hydrogen sulphide (which smells like rotten eggs), which is responsible for the blackening of mud (owing to the formation of black metal sulphides) in such habitats.

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