The isoprenoid quinone composition of 51 Gram-negative, aerobic, marine bacteria representing the genera and was examined using high-performance liquid chromatography. and strains contained ubiquinone with eight isoprene units as their most abundant component, whilst ubiquinones with nine isoprene units predominated in and marine strains. Members of the genus contained both ubiquinones and menaquinones. The presence of two types of isoprenoid quinones in is thought to be unique amongst Gram-negative, aerobic bacteria. In addition, methylmenaquinones were also found in strains. The results demonstrate that the analysis of isoprenoid quinones offers a rapid and effective method of differentiating between some marine bacteria.


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