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Influence of Sublethal Treatment with Heat or Chlorine on the Growth of Psychrophilic Bacteria¹

Dairy Industry Section, Iowa Agricultural Experiment Station, Ames

ABSTRACT

Conclusions:

1. When a culture was partially killed by heat, the survivors had a greatly increased lag phase when holding was at 5° or 10° C. A slightly increased lag phase was noted when holding was at 25° C.
   
2. Immediately after heating, larger numbers of survivors of sublethal doses of heat were enumerated on Plate Count agar than on TGE agar, but by 24 hours this difference had largely disappeared.
   
3. The growth curves of organisms surviving treatment with chlorine were not altered to any great extent.
   

¹ Journal Paper No. J-2617 of the Iowa Agricultural Experiment Station, Ames. Project No. 1050 and 1232.

² Present address: Quality Control Committee, St. Paul, Minn.

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