01699naa a2200145 a 450000100080000000500110000800800410001910000150006024501610007526000090023652012020024565000120144770000200145977300740147916499582023-04-25       1978    bl uuuu     u00u1 u    #d1 aKHAN, A. W  aEffect of sulfur-containing compounds on anaerobic degradation of cellulose to methane by mixed cultures obtained from sewage sludge.h[electronic resource]  c1978  aTests were made to determine the effects on inorganic and organic sulfur sources on the degradation of cellulose to methane in an chemically defined medium with sulfur-poor inoculum prepared for sewage sludge. The results show that a sulfur source of about a 0.85 mM concetration is essential for the degradation of cellulose to CH4. Howewer, the production of CH4 from CO2 and H2 provided in the headspace ocurred with 0.1 mM sulfate or sulfide. At a 9 mM concetration, all inorganic sulfur compounds other than sulfate inhibited both cellulose degradation and methane formation, and this inhibition incresead in the order thiosulfate &ltsulfite &ltsulfide &ltH2S. It appears that the degradation of cellulose to CH4 in a sulfate-free medium by inoculum maintained in a low-sulfur medium is inhibited because of the lack of a availability of sulfur for growth of bacteria and synthesis of cell materials and sulfur-containing cofactors involved in cellulose degradation and methanogenesis. The reduction of methanogenesis. The reduction of methanogenesis by higher levels of sulfate probably occurs as a result of stimulation of reactions converting acetate and H2 to end products other than CH4.  aEnxofre1 aTROTTIER, T. M.  tApplied and Environmental Microbiologygv.35, n.6, p.1027-1034, 1978.