Key Processes and Prokaryotes in the Sulfur Cycle Process Organisms Sulfide/sulfur oxidation(H2S→s0→So,2) Aerobic Sulfur chemolithotrophs硫的氧化 (Thiobacillus,Beggiatoa,many others) Anaerobic Purple and green phototrophic bacteria,some chemolithotrophs Sulfate reduction (anaerobic)(SO2--H2S) 硫的还原 Desulfovibrio,Desulfobact Archaeoglobus (Archaea) 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(CHgSH-CO2+H2S) (DMSO→DMS, Many organisms can do this Desulfurylation (organic-S-H2S) Many organisms can do this 脱硫硫的还原 硫的氧化 硫的歧化反应 脱硫 Thiosulfate