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Results concerning the ruminal fluid growth requirement of the ruminal acetogen, Syntrophococcus sucromutans, indicate that octadecenoic acid isomers satisfy this essential requirement. Complex lipids, such as triglycerides and phospholipids, can also support growth. The cellular fatty acid and aldehyde composition closely reflects that of the lipid supplement provided to the cells. Up to 98% of the fatty acids and 80% of the fatty aldehydes are identical in chain length and degree of unsaturation to the octadecenoic acid supplement provided in the medium. S. sucromutans shows a tendency to have a greater proportion of the aldehyde form among its 18 carbon chains than it does with the shorter-chain simple lipids, which may be interpreted as a strategy to maintain membrane fluidity. 14C labeling showed that most of the oleic acid taken up from the medium was incorporated into the membrane fraction of the cells.

Lipid growth requirement and influence of lipid supplement on fatty acid and aldehyde composition of Syntrophococcus sucromutans