Sulfur isotope fractionation during SO3(2-) reduction by different clostridial species.

Sulfur isotope composition patterns for sulfide evolved from cultures supplemented with 1 mM Na2SO3, suggested that an inducible dissimilatory type SO3(2-) reduction pathway, as previously found in C. pasteurianum, probably exists in many clostridial species. Data are presented for five additional species which include pathogens and nonpathogens.