- Volume 17, Issue 1, 1957
Volume 17, Issue 1, 1957
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The Application of Computers to Taxonomy
More LessSUMMARY: A method is described for handling large quantities of taxonomic data by an electronic computer so as to yield the outline of a classification based on equally weighted features. This enables Similarity to be expressed numerically, and would allow taxonomic rank to be measured in terms of it. An example in bacteria is given, and the results compared with the conventional classification. The method is to count the number of similar and of dissimilar features between strains and to sort the strains into groups whose members have a high percentage of similarities.
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The Surface Structure and Serological Typing of Bacillus megaterium
More LessSUMMARY: The surface structures and serological typing of 54 strains of Bacillus megaterium were examined and compared with strain M. Morphologically the strains could be divided into 2 groups on the basis of cell size, fat content and susceptibility to enzymes. Forty homologous immune sera were prepared in rabbits. On the basis of the capsular and cell-wall reactions, 38 distinct serological types were found. The arrangement of the polysaccharide and polypeptide material in the capsules is described. Agglutination reactions confirmed the heterogeneity of the polysaccharides in the cell wall and capsules of B. megaterium and demonstrated a further relationship between 3 of the strains, probably due to the flagellar antigen. Precipitin reactions carried out with the supernatant fluid from broth cultures or with cell-wall extracts showed a much broader specificity.
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