Variations of the Moles Percent Guanine plus Cytosine Within a Group of Enterobacteriaceae Belonging or Related to the Genus Enterobacter

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Abstract
This study is a measurement of the moles percent guanine plus cytosine of 34 strains of bacteria belonging or related to the genus Enterobacter. All of the strains included in the sampling have been previously studied by numerical taxonomy, which has shown four new classes: H1, H2, H3, and d. The average guanine-plus-cytosine contents for the defined species and of the new classes are: Enterobacter cloacae (10 strains), 54.5 mol% (standard deviation, 1.32); Hafnia alvei (5 strains), 48.1 mol% (standard deviation, 1.0); Enterobacter agglomerans (syn. Erwinia herbicola) (1 strain), 52.4 mol% (standard deviation, 0.41); Serratia liquefaciens (1 strain), 50.9 mol% (standard deviation, 1.22); Enterobacter aerogenes (1 strain), 53.5 mol% (standard deviation, 0.29); class H1 (5 strains), 52.2 mol% (standard deviation, 1.3); class H2 (5 strains), 53.4 mol% (standard deviation, 1.9); class H3 (5 strains), 54.2 mol% (standard deviation, 0.1); class d (1 strain), 52.6 mol% (standard deviation, 1.45). The importance of the guanine-plus-cytosine contents for discriminating defined species and new classes is discussed.