Key Processes and Prokaryotes in the Sulfur Cycle Process Organisms Sulfide/sulfur oxidation (H2S→S0→SO,2） Sulfur chemolithotrophs 硫的氧化 Aerobic (Thiobacillus,Beggiatoa,many others) Anaerobic Purple and green phototrophic bacteria,some chemolithotrophs Sulfate reduction (anaerobic)(SO2-->H2S) 硫的还原 Desulfovibrio,Desulfobacter, Sulfur reduction(anaerobic)(S-H2S) Desulfuromonas,many hyperthermophilic Archaea Sulfur disproportionation(S2O32→H2S+SO42)硫的歧化反应 Thiosulfate Desulfovibrio,and others Organic sulfur compound oxidation or reduction(CHSH-CO2+H2S) (DMSO→DMS) Desulfurylation (organic-S->H2S) 脱硫 Many organisms can do this硫的氧化 硫的还原 硫的歧化反应 Thiosulfate 脱硫