Principles and practice of operative dentistry . esence of their ownexcretory or waste products; for instance, the yeast plant ceases to growafter fourteen per cent, of alcohol has been formed. The ammoniac fermentation of urine ceases when the ammonium car-bonate reaches thirteen per cent. (Fliigge.) In lactic acid fermentation the process ceases when the acidity hasreached to per cent., and the micro-organism is often destroyedby the action of the acid which has been produced. Lactic acid fermentation of the carbohydrates takes place spontaneouslyin milk, in the juice of the sugar-
Principles and practice of operative dentistry . esence of their ownexcretory or waste products; for instance, the yeast plant ceases to growafter fourteen per cent, of alcohol has been formed. The ammoniac fermentation of urine ceases when the ammonium car-bonate reaches thirteen per cent. (Fliigge.) In lactic acid fermentation the process ceases when the acidity hasreached to per cent., and the micro-organism is often destroyedby the action of the acid which has been produced. Lactic acid fermentation of the carbohydrates takes place spontaneouslyin milk, in the juice of the sugar-beet, in the accumulations in the oralcavity, etc., and may be artificially induced by a large number of differentbacteria in saccharine solutions. (Miller.) Acids and alkalies possess a certain amount of controlling influence inthe growth of bacteria, especially the former. Acids in very dilute solu-tion retard the development of bacteria. There are, however, importantexceptions to this rule, as, for instance, the Mycoderma aceti—acetic acid. Fig. 238.—FI age I lilted spirilhi- ainl vibrio. ,•; 2100. «.Vot A--1 •• -\ Vat*-- Al-? O-s:- V -tmS%S^ ^%. ^^. Fig. 239.—Bacillus of hog cholera. (V. A. Latham.) X 1000. \ ^ « •*? % ^ ;. :, Fig. 240.—Staphylococcus p\ ogenes. (V. A. Latham.) xiooo.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdentist, bookyear1920
