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Journal of Dairy Science Vol. 38 No. 7 743-750
© 1955 by American Dairy Science Association ®
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The Influence of Certain Factors on the Bacterial Counts and Proteolytic Activities of Several Psychrophilic Organisms1

W. C. Van Der Zant and A. V. Moore

Dairy Husbandry Department, Texas Agricultural Experiment Station, College Station

ABSTRACT

A plate incubation for 3 days at 25° C. is recommended for the enumeration of bacteria growing in refrigerated milk and related products. Three of the four psychrophiles studied were able to grow over a wide range of temperatures. With the exception of one, all organisms had a short lag phase even at the lower holding temperatures. No relation was evident between level of population and proteolytic activity. There appeared to be some relationship between the values for the production of soluble nitrogen and tyrosine and tryptophan.

FOOTNOTES

1 Journal Paper No. 2074 of the Texas Agricultural Experiment Station, College Station. Project No. B-J 924.






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Copyright © 1955 by the American Dairy Science Association ®.