- Volume 95, Issue 2, 1976
Volume 95, Issue 2, 1976
- Taxonomy
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An Approach to Numerical Identification of Bacterial Species
More LessSUMMARY: The distribution of matching coefficients (M values) for strains of a species to their own hypothetical mean organism (HMO) or to HMO patterns of other organisms was studied in 754 strains of 19 mycobacterial species, testing for 91 discriminating characters. The M values of strains of a species to the HMO of other species usually showed a normal distribution, and M values to their own HMO showed either a normal distribution or a binomial distribution, depending on the mean of M values. If the number of test characters was large, the binomial distribution usually resembled the normal distribution.
After preparation of the HMO for every species and estimation of the mean of the M values (M) and the standard deviation (s), numerical identification could be carried out: if a test strain had an M value to the HMO of species x that only fell within the range (M ±2s) for species x, the strain would be identified as a member of that species.
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Numerical Taxonomy of Aquatic Acinetobacter Isolates
More LessSUMMARY: Two hundred and seventy Gram-negative strains, representing aquatic members of the genus Acinetobacter, were isolated and compared with 48 related clinical isolates and reference strains from a variety of genera. For each isolate, a total of 96 coded characters derived from 89 characteristics was determined using morphological, physiological, nutritional and biochemical features, in addition to sensitivities to several antibiotics and inhibitory agents. The data were analysed by computer to obtain a simple matching coefficient for each pair of strains. Clustering was performed by the unweighted pair-group method of association.
Two major phenons were formed which excluded the oxidase-positive, motile or facultatively anaerobic strains. Within each phenon, three ‘subphenons’ were delimited. The two phenons, comprising 291 isolates, were tentatively differentiated at the species level, while their shared characteristics indicated that both phenons should be included in the genus Acinetobacter. Phenon 2 contained most of the clinical isolates and corresponded to the type species Aci. calcoaceticus as described originally by Baumann, Doudoroff & Stanier (1968). Phenon 1 was composed almost entirely of aquatic isolates and may prove to represent a second species of a less biochemically-active nature.
Distinguishing characters have been suggested as diagnostic criteria for the differentiation of these two phenons.
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