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Sulfur-reducing bacteria specialize in producing energy by reducing elemental sulfur to hydrogen sulfide with hydrogen or organic compounds. These include several types of bacteria and many non-methanogenic archaea. These bacteria are highly needed in order to keep the level of sulfur low.
Sulfur-reducers utilize the fermentation products in anaerobic respiration and unitizing the sulfate to produce hydrogen sulphide gas.
Examples of this type of metabolism are green sulfur bacteria and purple sulfur bacteria.
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