Etude du % GC dans un groupe d'entérobactéries H2S−, apparentées au genre Citrobacter

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Abstract
The DNA of 106 strains of Enterobacteria was analyzed for the guanine + cytosine (GC) content. These strains, whose origin and principal characters are described in the text, belong to the genera Citrobacter (C. freundii H2S-) and Levinea (L. malonatica and L. amalonatica). Four other groups or classes named C, D, E and F could not be classified on the basis of the usual phenotypic criteria. DNA from the strains of Levinea has a GC % of 50.3-53.3, while DNA from the strains of C. freundii H2S- has a GC % of 48.6-51.7. The representative values from the new classes are C, 50.9%; D, 54%; E, 52.7%; F, 49.5%. For the latter a genomic heterogeneity was shown, expressing itself as 2 subpopulations whose average GC% are 51.7 and 48.6, respectively. Statistical analysis of the averages give a significant individuality to these new classes.