Summary: The fatty acid profiles of sp. grown on acetate and sp. grown on propionate, lactate and H/CO were analysed. sp. grown on acetate and sp. grown on H/CO gave mainly even numbered straight chain acids but odd numbered acids predominated in sp. grown on propionate, reflecting the use of the growth substrates provided as chain initiators for fatty acid biosynthesis. The cellular fatty acids of sp. grown on lactate were distributed approximately evenly between even and odd straight chain acids. In contrast those of Desulfovibrio desulfuricans, were dominated by branched chain iso and anteiso fatty acids, when grown on either lactate or H/CO. On the basis of the fatty acid biosynthetic pathways these sulphate-reducing bacteria could be separated into two groups, one comprising sp. and sp. and the other more primitive .


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