Outlines of Dairy Bacteriology, 8th editionA Concise Manual for the Use of Students in Dairying

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Author: H.L. Russell
Published: 1905
Language: English
Wordcount: 53,968 / 179 pg
Flesch-Kincaid Reading Ease: 52.2
LoC Category: LT
Downloads: 510
Added to site: 2009.01.12
mnybks.net#: 23112
Genre: Instructional

Knowledge in dairying, like all other technical industries, has grown mainly out of experience. Many facts have been learned by observation, but the why of each is frequently shrouded in mystery.Modern dairying is attempting to build its more accurate knowledge upon a broader and surer foundation, and in doing this is seeking to ascertain the cause of well-established processes. In this, bacteriology is playing an important rôle. Indeed, it may be safely predicted that future progress in dairying will, to a large extent, depend upon bacteriological research.

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ces of a detrimental character are constantly at work on bacteria, tending to repress their development or destroy them. These act much more readily on the vegetating cell than on the more resistant spore. A thorough knowledge of the effect of these antagonistic forces is essential, for it is often by their means that undesirable bacteria may be killed out.

~Effect of cold.~ While it is true that chilling largely prevents fermentative action, and actual freezing stops all growth processes, still it does not follow that exposure to low temperatures will effectually destroy the vitality of bacteria, even in the vegetative condition. Numerous non-spore-bearing species remain alive in ice for a prolonged period, and recent experiments with liquid air show that even a temperature of -310° F. for hours does not effectually kill all exposed cells.

~Effect of heat.~ High temperatures, on the other hand, will destroy any form of life, whether in the vegetative or latent stage. The temperature at whic

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