Fig. 1: The biogeochemical sulfur cycle.

A simplified diagram showing key transformations in the cycling of inorganic and organic sulfur. A selection of diverse, metabolically and environmentally important organosulfur compounds produced intracellularly is shown. DMS, dimethylsulfide; DMSO, dimethylsulfoxide; DMSP, dimethylsulfoniopropionate; Me, methyl group.