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Some bacteria – such as Proteus, Campylobacter, Pseudomonas and Salmonella – have the ability to reduce sulfur, but can also use oxygen and other terminal electron acceptors. Others, such as Desulfuromonas, use only sulfur.
These bacteria can be used in industrial processes to generate hydrogen sulfide for the precipitation of metals.
Some bacteria can use both elemental sulfur and sulfate as electron acceptors. See sulfate-reducing bacteria.