SUMMARY: Hybrids were prepared between C-labelled rRNA from each of nine species of Gram-negative bacteria and the DNA of . Two parameters were determined for each hybrid — the , which is the temperature at which 50% of the hybrid was denatured, and the percentage of rRNA bound under defined stringent conditions. The former gives a measure of the stability of the duplex once formed and the latter probably reflects the amount of the genome involved in the coding of rRNA. These parameters were used as a measure of the relatedness of to each of the other nine species. The results suggest that is more closely related to than to any other species tested. The taxonomic relationship of to other Gram-negative bacteria was assessed by incorporating the results into a database already published by De Ley (1978), and the use of principal components analysis was explored as an alternative way of presenting such data. This analysis confirmed the isolated position of but, until further isolates are studied, it seems best to retain the species in the genus .


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