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Clonal relationships among naturally occurring nicotinamide-requiring Salmonella typhimurium

Published online by Cambridge University Press:  14 April 2009

Ruth M. Barker  and
A. A. Yousuf
Ruth M. Barker
Affiliation:
Department of Medical Microbiology, University of Dundee Medical School, Ninewells Hospital, Dundee DD1 9SY, Scotland
A. A. Yousuf
Affiliation:
Department of Medical Microbiology, University of Dundee Medical School, Ninewells Hospital, Dundee DD1 9SY, Scotland
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Summary

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Salmonella typhimurium strains of biotype 25x have been shown in transductional cross experiments to be clonal in the Nad character. The ancestral bacterium, probably of biotype 25a, mutated to a requirement for nicotinamide and subsequently diversified in phage type and secondary biotype characters. Such a sequence of events indicates interconversion among phage types 6, 16, 46, 49, 73, 76 and 135. Strains in biotypes 1x, 9ix, 17x, 17dx, 19dx and 25hix yielded Nad+ recombinants in interbiotype crosses, suggesting that each originated as an independent mutant line.

Information

Type
Research Article
Information
Genetics Research , Volume 46 , Issue 3 , December 1985 , pp. 241 - 250
Copyright
Copyright © Cambridge University Press 1985

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