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Summary

In order to validate unusual fatty acids as biomarkers for sulphate-reducing bacteria, selective conditions were arranged for the enrichment of a marine glutamate-fermenting bacterium which made hydrogen and acetate available for oxidation via the respiration of sulphate. Under these conditions the complete oxidation of glutamate via sulphate reduction accounted for 84% of the available electron equivalents. Fatty acid biomarkers for hydrogen-oxidizing Desulfovibrio sp. (iso 17:1w7c and branched monoenoics) and for acetate-oxidizing Desulfobacter (10 methyl 16:0) were detected in the enrichment. These biomarkers were demonstrated in pure cultures of Desulfovibrio sp. and Desulfobacter sp. obtained from the enrichment. The predominant glutamate-fermenting bacterium isolated from the consortium contained no branched ester-linked phospholipid fatty acids, and produced acetate and hydrogen. With energy limitation the enriched consortium produced increased amounts of extracellular polysaccharide and the endogenous storage lipid poly-beta-hydroxybutyrate as detected with Fourier transform/infra-red (FT-IR) spectroscopy.

Sulphate-reducing bacteria, Infra-red, Fatty acids, Biomarkers

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© 1988 Federation of European Microbiological Societies
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