Bacteria, Especially As They Are Related to the Economy of Nature, to Industrial Processes, And to the Public Health
The book Bacteria, Especially As They Are Related to the Economy of Nature, to Industrial Processes, And to the Public Health was written by author Sir George Newman Here you can read free online of Bacteria, Especially As They Are Related to the Economy of Nature, to Industrial Processes, And to the Public Health book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Bacteria, Especially As They Are Related to the Economy of Nature, to Industrial Processes, And to the Public Health a good or bad book?
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The process of fermentation may be set up by a " high " or a "low" yeast These terms apply to the temperature at which the process commences. " High " yeasts rise to the surface as the action proceeds, accomplish their work rapidly, and at a comparatively high temperature, say about 16** C; " low " yeasts, on the contrary, sink in the fermenting fluid, act slowly, and only at the low temperature of 4** or 5** C. This is maintainable by floating ice in the fluid. Formerly all beer was made by th...e " high " mode, but on the continent of Europe "low" yeast is mostly used, whilst the "high" is in vogue in England. This latter method is more conducive to the development of extraneous organisms, and therefore risky in all but well - ordered brewing establishments. Whether high and low yeasts consist of one or several species is not known. Before proceeding to mention shortly some of the com- moner forms of yeast we must again emphasize Hansen's method of analysis in separating a species. The shape, size, and appearance of cells are not sufficient for differgntiation, because it is found that the same species when exposed to different external conditions can occur in very different forms.
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