Figure 1.

Detailed structures of relevant sulfur compounds and reactions proposed for sulfur globules production. (A) Enzymatically catalyzed reactions. TD, thiosulfate dehydrogenase; TTH, tetrathionate hydrolase. (B) Anoxygenic condensation of disulfane monosulfonic acid that leads to polythionates generation. (C) Successive condensation reactions of sulfane monosulfonic acids that leads to elemental sulfur production. TS, thiosulfate; TT, tetrathionate; DSMSA, disulfane monosulfonic acid; SO₄, sulfate; SO₃, sulfite; PT, pentathionate; TSMSA, tetrasulfane monosulfonic acid; OSMSA, octosulfane monosulfonic acid; S₈, elemental sulfur. Reactions according to Steudel et al. (1987).