Metabolism of low molecular weight organic compounds and hydrogen by sulfate reducing bacteria in a delaware salt marsh
Newark, Del., Univ. of Delaware, Diss., 1983
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| Sprache: | eng |
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Tag hinzufügen | Zusammenfassung: | Newark, Del., Univ. of Delaware, Diss., 1983 The role of sulfate-reducing bacteria (SRB) in the metabolism of organic compounds and H(,2) was studied in ditch bottom sediments from the Canary Creek marsh in Lewes, Delaware. With the exception of lactate and formate, all organic acids tested resulted in no stimulation of sulfate reduction activity (SRA) whereas straight chain alcohols (C(,1)-C(,4)) gave significant increases in SRA. In addition, glucose, cellobiose and H(,2) resulted in a 2-fold or greater increase in SRA. Molybdate, an inhibitor of SRB, caused a total inhibition in SRA. Oxidation of acetate, ethanol, lactate and pyruvate to CO(,2) was rapid with significant inhibition of oxidation rate in the presence of molybdate (60-90% decrease in oxidation). 2-Bromoethanesulfonic acid (BES), an inhibitor of methanogenic bacteria, generally had no effect on oxidation rate. Further studies with lactate and ethanol showed acetate to be the only organic end product in the oxidation of these substrates. Studies with H(,2) indicate that SRB play important roles as H(,2)-scavengers in the sediment and that large amounts of H(,2) are produced during the anaerobic fermentation of glucose. Competition studies with lactate, acetate and ethanol indicate that the preferred order of utilization is lactate > acetate > ethanol. The turnover times of these three compounds is rapid (10-13 hours) with the turnover time increasing 2-3 fold in the presence of molybdate. These studies strongly suggest that SRB play a major role in the metabolism of low molecular weight organic compounds and H(,2) in marsh sediments. |
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| Beschreibung: | 199 S. |