[Music] thank you sulfur cycle sulfur is an essential element for the macro molecules of living organisms as part of the amino acids sustain and methionine it is involved in the formation of proteins sulfates are taken up by plants and microbes when organisms die some sulfur is released by decomposition other natural sources of sulfur include volcanic eruptions mineral pyrite and weathering of crust steps in Sulfur cycle decomposition of organic compounds during decomposition though dead organisms bacteria and fungi remove sulfur groups from amino acids producing hydrogen sulfide oxidation of hydrogen sulfide to Elemental sulfur hydrogen sulfide is oxidized to Elemental sulfur by bacteria photolithic riffs and aerobic purple sulfur bacteria chromosome green sulfur bacteria chlorobium enzyme membrane-bound Quin one oxino reductase oxidation of Elemental sulfur into sulfates Elemental sulfur present in the soil cannot be utilized directly by plants it is converted into sulfates chemo liquor autotrophs aerobic Theo bacillus enzyme membrane-bound sulfide oxino reductase reduction of sulfates sulfates are reduced to hydrogen sulfide bisulfate reducing bacteria chemolithiin orotrophs disulfo vibrio desulfuromas desulfidomiculum desulfobacter enzyme membrane bound sulfide reductase bacteria involved in Sulfur cycle [Music]