Fractionation of sulfur isotopes by the yeast Saccharomyces cerevisiae

Details Fractionation of sulfur isotopes by the yeast Saccharomyces cerevisiae Fractionation of sulfur isotopes by the yeast Saccharomyces cerevisiae

Aug 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974gecoa..38.1239m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 38, Issue 8, pp.1239-1253

Physics

1

Scientific paper

Growing and resting cell suspensions of Baker's yeast ( Saccharomyces cerevisiae ) were permitted to metabolize sulfite and sulfate under a variety of environmental conditions. Enrichment of S 32 in the H 2 S released during reduction of sulfate under growing conditions was consistently lower ( S 34 < -25%.) than enrichment during reduction of sulfite under similar conditions ( S 34 ~ -30 to -50%.). Yeast cells harvested from a sulfite medium released small quantities of H 2 S when suspended in glucose-sulfate solution; cells from a sulfate growth medium did not. The enrichment of H 2 S in S 32 by sulfite-grown resting cells suspended in either SO 2- 4 or SO 2- 3 solutions was about 10%.in less than the maximum obtained during growth on sulfite. Isotopic fractionation was always significantly less in assimilated, than in dissimilated sulfur.

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