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<p>and sulfur compounds can be used as oxidants or reductants in microbial respiration. The global <a href="page.php?w=sulfur">sulfur</a> cycle involves the transformations of sulfur species through different oxidation states, which play an important role in both geological and biological processes. Steps of the sulfur cycle are:<br/>
* Mineralization of <a href="page.php?w=Organosulfur_compounds">organic sulfur</a> into inorganic forms, such as <a href="page.php?w=hydrogen_sulfide">hydrogen sulfide</a> (H<sub>2</sub>S), elemental sulfur, as well</p><p>
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