McCready R G, Laishley E J, Krouse H R
Arch Microbiol. 1976 Sep 1;109(3):315-7. doi: 10.1007/BF00446644.
An unique isotope labelling experiment was conducted whereby mixtures of sulfate and sulfite of different isotopic compositions were metabolized by Clostridium pasteurianum. The results showed during reduction of 1 mM SO3= plus 1 mM SO4=, essentially all evolved H2S arose from the sulfite whereas in the case of cellular sulfur, 85% was derived from sulfite and the remainder from sulfate.
