Influence of sulfide compounds on the metabolism of Methanobacterium strain AZ.

Various organic sulfides and inorganic sulfide were studied in respect to their effect on growth and methane production of Methanobacterium strain AZ. In mineral, sulfide-free medium, cysteine regulated the specific rate of methane production (optimum concentration = 5-10(-4) mole/1). A supplement of sulfide (10(-4) mole/1) caused an additional stimulation.