- Volume 112, Issue 1, 1979
Volume 112, Issue 1, 1979
- Short Communication
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Glucan-binding Proteins of Streptococcus mutans Serotype c
More LessThree glucan-binding proteins have been isolated from the extracellular fluid of cultures of Streptococcus mutans serotype c. These proteins were adsorbed to glucans containing 1,3-α or 1,6-α bonds and linked to various chromatographic supports: they were eluted from columns by a dextran solution. Glucosyltransferase activity was associated with two of the glucan-binding proteins.
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High and Low Toxin Production by a Non-toxigenic Strain of Clostridium botulinum Type C Following Infection with Type C Phages of Different Passage History
More LessToxin production in Clostridium botulinum types C and D is governed by specific bacterio-phages. Prior passages of a phage controlling type C toxin production caused subsequently lysogenized bacteria to become variably toxigenic. This appears to be one of the causes of the decrease in toxigenicity which is common in some type C and D strains. The morphology of bacteria was also changed from rod-shaped to filamentous by infection with a successively propagated phage.
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- Taxonomy
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Numerical Taxonomy of Actinomadura and Related Actinomycetes
More LessOne hundred and fifty-six Actinomadurastrains, marker strains of related taxa, and related isolates from bagasse and fodder were the subject of numerical phenetic analyses using 90 unit characters. The data were examined using the simple matching (S SM ), Jaccard (S j ) and pattern (D P ) coefficients and clustering was achieved using both single and average linkage algorithms. Cluster composition was not markedly affected either by the coefficient or clustering algorithms used or by test error, estimated at 4·5 %. Actinomadura dassonvillei, Actinomadura madurae and Streptomyces somaliensis formed good taxospecies, but the separation of Actinomadura pelletieri strains into two clusters by S j and S sm analysis requires further study. The single representatives of Actinomadura helvata, Actinomadura pusilla, Actinomadura roseoviolacea, Actinomadura spadix and Actinomadura verrucosospora seemed to form new centres of variation while Actinomadura citrea and Actinomadura malachitica showed much similarity with Actinomadura madurae. Most of the isolates from bagasse and fodder were recovered in two well-defined phena, provisionally labelled clusters ‘A’ and ‘B’which showed little similarity to either Actinomadura or Nocardia strains. The effect of the different coefficients on the aggregation of clusters is discussed.
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