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Volume 74,
Issue 1,
1973
Volume 74, Issue 1, 1973
- Short Communication
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- Taxonomy
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Carbon Source Utilization Tests as an Aid to the Classification of Non-fermenting Gram-negative Bacteria
More LessSUMMARY: Some factors which affect the results of carbon source utilization (CSU) tests were investigated with 187 strains of Gram-negative bacteria, chiefly non-fermentative. There was little difference between the results at 37 and 30°C. Repetition of tests showed that 5% of the results were non-reproducible. The variability was most pronounced with acetate, maleate and sucrose amongst the substrates and Loefflerella mallei amongst the bacteria. Prior induction of the bacterial enzymes before testing did not reduce variability nor show any other advantage. Analysis of the results by numerical taxonomic methods revealed differences in the groups of bacteria derived from the results of CSU tests compared with those derived from conventional biochemical test results. CSU tests readily provide a large number of taxonomic features with the advantage of a simple standardized testing procedure.
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Numerical Taxonomic Analysis of Some Slowly Growing Mycobacteria Using Hypothetical Median Strain Patterns
More LessSUMMARY: The reactions of 1498 isolates of slowly growing mycobacteria in 50 character states have been compared to those of 17 hypothetical median strain patterns. The establishment of intra- and intertaxon matching values for clusters so generated, allowed certain aggregates of taxa to be recognized for which a conventional n × n matching matrix might provide more clear cut taxonomic definition of species. Those species which are clearly distinct from the others include Mycobacterium tuberculosis, M. bovis, M. kansasii, M. flavescens, M. xenopi and M. gastri. Problems still exist regarding the precise separation of taxa within Runyon Groups II (M. scrofulaceum, M. gordonae and IIIB) and Group III (M. avium—M. intracellulare and M. terrae—M. nonchromogenicum—M. novum—M. triviale). These latter are discussed.
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Numerical Taxonomy of Selected Slowly Growing Mycobacteria
More LessSUMMARY: A total of 190 strains of slowly growing scotochromogenic and non-photo-chromogenic mycobacteria, randomly selected from a larger group of 1498 strains, has been analysed using a weighted pair-group method. Dendrograms were constructed from the correlation coefficient data. Mycobacterium flavescens was clearly distinguished from all other scotochromogens. Although not precisely defined, one cluster of pigmented organisms, currently identified only as Group IIIB, appears to compromise a taxon intermediate between M. scrofulaceum and M. gordonae. Among the non-photochromogens M. triviale is clearly distinct from the others, while the M. avium—M. intracellulare aggregate would appear to represent only host-adapted variants of the taxon M. avium. Mycobacterium terrae and M. novum appear to be very closely related, and only slightly different from M. nonchromogenicum. The possibility that these last three represent distinct taxa is considered.
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