Open AccessIsotope effects associated with the anaerobic oxidation of sulfide by the purple photosynthetic bacterium, Chromatium vinosum
Author(s) -
Howard Gest Brian Fry.,
Hayes J.M.
Publication year - 1984
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.1984.tb00742.x
Subject(s) - chromatium , sulfur , sulfide , chemistry , isotope fractionation , environmental chemistry , isotope , photosynthesis , fractionation , inorganic chemistry , biochemistry , organic chemistry , physics , quantum mechanics
Small inverse isotope effects of 1–3‰ were consistently observed for the oxidation of sulfide to elemental sulfur during anaerobic photometabolism by Chromatium vinosum . The inverse fractionation can be accounted for by an equilibrium isotope effect between H 2 S and HS − , and may indicate that C. vinosum (and other photosynthetic bacteria) utilizes H 2 S rather than HS − as the substrate during sulfide oxidation.