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239. Examples of variation within pure cultures of Streptococcus cremoris

Published online by Cambridge University Press:  01 June 2009

G. J. E. Hunter
G. J. E. Hunter
Affiliation:
From the Dairy Research Institute (D.S.I.R.), Palmerston North, New Zealand
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Extract

Indications of variability within pure strains of Str. cremoris have been studied.

In one strain changes in acid-producing power were made evident by changes in colony form. A variant which failed to ferment lactose but was still susceptible to the specific race of bacteriophage and exhibited the same morphology (after treatment at 37° C.) as the parent culture is described.

It was found that variation was well marked within some strains, especially in regard to acid production (or vitality), response to high temperature conditions, power to produce ropiness in milk, and degree of resistance to phage attack.

Type
Original Articles
Information
Journal of Dairy Research , Volume 10 , Issue 3 , September 1939 , pp. 464 - 470
Copyright
Copyright © Proprietors of Journal of Dairy Research 1939

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References

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