1.大腸菌之懸游液對若干硫化物有脫硫化氫之現象,對於Cystcnie之脫硫化氫最為強盛。其次為Na-thiosulfatc, Pcptone及Na-sulphite等化合物之脫硫化氫均經試驗。2. 大腸菌脫硫化氫酵素之賦活劑及抑制劑亦曾研究。大腸菌TP-004之賦活劑為pyridoxal phosphatc, adcnosinc-5-phosphatc, biotin, glutamic acid, serinc, aspartic acid, pyruvic acid及glucosc;抑制劑為,a-ketoglutaric acid, alanine, EDT A, glycine, scmicarbazide, fructose, glyccrol及penicillin.