Sulphate- and sulphur-reducing Proteobacteria
Some 20 genera of anaerobic δ-Proteobacteria reduce either elemental sulphur or oxi-dised forms of sulphur such as sulphate to hydrogen sulphide. Organic compounds such as pyruvate, lactate or certain fatty acids act as electron donors:
Sulphate- and sulphur-reducers are found in anaerobic muds and play an important role in the global sulphur cycle.
Representative genera: Desulfovibrio (sulphate), Desulfuromonas (sulphur)
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