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Title: The structure and mode of growth of bacterial colonies
Author: Bisset, K. A.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1939
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(1) The structure of e morphologically "rough" colony of e bacillus or vibrio is essentially similar to that of trie "Medusa head" colony of the anthrax bacillus. The bacteria are closely attached end to end in the form of threads. (2) The bacteria composing a smooth colony tend to be separate from one another and show no characteristic arrangement. (3) Between these extremes are e number of intermediate forms. (4) These variations are paralleled by similar forms found among the streptococci and pneumococci. (5) The structure of e colony depends ultimately upon physical factors and varies mainly with the degree of attachment of the component organisms. (6) The division of the filamentous forms composing rough colonies is much less regular in occurrence and position than is that of the individual bacteria composing smooth colonies. (7) The usually described S -» R variation appears to consist of two separate changes, one affecting the morphology of the organism, the other connected solely with the nature of its capsular material or other antigenic constituents, These may occur separately, though a considerable degree of relationship appears to exist. (8) The biological significance of the morphological variations are discussed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available