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PubMed2001

Helical growth and the curved shape of Vibrio cholerae.

The curved, comma, or bent shape of Vibrio cholerae is attributed to, and explained by, the normal helical growth of the cell. The comma-like shape of V. cholerae is not due to an asymmetrical positioning of peptidoglycan such that some chains of peptidoglycan are placed so they are more spread out on one side of the cell and squeezed together on the other side.

Escherichia coli↗
PubMed1968

A simple procedure for detecting the presence of cyclopropane fatty acids in bacterial lipids.

Four gram-negative bacterial species, including Escherichia coli strain B, Serratia marcescens, Pseudomonas fluorescens, and Vibrio cholerae (comma) strain NIH 41, were investigated for fatty acid content by gas-liquid chromatography involving a preparatory technique which facilitated detection of cyclopropane fatty acids. Methyl esters of fatty acids were subjected to mild catalytic hydrogenation to eliminate unsaturates. Hydrogenation was followed by bromination which removed cyclopropane acids from chromatographic profile patterns. Lactobacillic acid (cis-11,12-methyleneoctanoate) and cis-9,10-methylenehexadecanoate, previously reported in lipids of E. coli and S. marcescens, were found in small amounts in P. fluorescens but were not detected in V. cholerae.

Chromatography, Gas↗