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The Method of Division of the Rough and Smooth Type of Colonies among Bacilli of the Salmonella Group

Published online by Cambridge University Press:  15 May 2009

Muriel M. Nutt
Muriel M. Nutt
Affiliation:
(From the Department of Bacteriology and Preventive Medicine, University of Manchester.)
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In 1921 Arkwright described two distinct types of colonies which appeared when cultures of Bacillus dysenteriae Shiga were plated on agar. One which he called the “rough” type had a coarsely granular surface rather like morocco leather, and an irregular margin. The other which he called the “smooth” type had a regular edge and a smooth surface. He found the same differentiation into rough and smooth colonies occurred among other member of the group, in B. typhosus, in B. paratyphosus B, and in B. enteritidis Gaertner. Since then these two types of colonies have been described in many other organisms; in streptococci by Cowan, in pneumococci by Griffith and by Reimann, in pasteurella by de Kruif, in meningococcu and gonococcus by Atkin, in the cholera vibrio by Shousha.

Type
Research Article
Information
Journal of Hygiene , Volume 26 , Issue 1 , March 1927 , pp. 44 - 48
Copyright
Copyright © Cambridge University Press 1927

References

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