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484. Studies in the bacteriology of milk: IV. The Gram-negative rods of milk

Published online by Cambridge University Press:  01 June 2009

Y. Abd-El-Malek  and
T. Gibson
Y. Abd-El-Malek
Affiliation:
Bacteriology Department, College of Agriculture, Edinburgh
T. Gibson
Affiliation:
Bacteriology Department, College of Agriculture, Edinburgh
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Extract

Using non-selective methods of isolation, the species that was detected with greatest frequency in raw milks of varying purity is Alcaligenes viscosus. The majority of the cultures do not produce a ropy condition in milk or other media. In some strains the oxidation of citrate, and hence the production of alkalinity in milk, is slow and erratic, being dependent on the occurrence of a mutation. The only Gram-negative rod detected in laboratory-pasteurized milk was A. tolerans n.sp., a description of which is given. That species is similar in general character to A. viscosus but differs principally in its greater resistance to heat, its inability to attack fats, and its erratic and usually poor growth on laboratory media. Greatly improved growth on nutrient agar is obtained by the addition of lactate and relatively high concentrations of ferrous or ferric salts.

Type
Original Articles
Information
Journal of Dairy Research , Volume 19 , Issue 3 , October 1952 , pp. 294 - 301
Copyright
Copyright © Proprietors of Journal of Dairy Research 1952

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References

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