. Fundamentals of botany. Botany. FERMENTATION 95 fundamental processes of plant physiology. Fermen- tation is most commonly associated in our minds with yeast. 92. Yeast.âPractically everyone is acquainted with yeast, which was the earliest recognized agent of fermen- tation. We are now most familiar with it in the form of small cakes, purchased at the grocer's for use in making bread and other "raised" dough. Our grandparents bought it in Uquid form from the local baker; and in brew- eries and large bakeries it is used in the liquid form in mak- ing beer and bread. If a small piece
. Fundamentals of botany. Botany. FERMENTATION 95 fundamental processes of plant physiology. Fermen- tation is most commonly associated in our minds with yeast. 92. Yeast.âPractically everyone is acquainted with yeast, which was the earliest recognized agent of fermen- tation. We are now most familiar with it in the form of small cakes, purchased at the grocer's for use in making bread and other "raised" dough. Our grandparents bought it in Uquid form from the local baker; and in brew- eries and large bakeries it is used in the liquid form in mak- ing beer and bread. If a small piece of a "compressed yeast" cake, about the size of a pea seed, is placed with a little sugar and water in a fermenta- ^ ,, ^ ..â .. ° Fig. 66.â-Fermentation-tube. tion-tube (Fig. 66), and set in l, level of fermenting liquid; â .c(7ârrr. nlnrp tVip miVtnrp will ^' ^P^" ^^^ ^* ^as (CO2) a warm place tne mixture wm given off by fermentation. soon begin to "work," and tiny bubbles of gas will be seen rising in increasing numbers to the top of the tube. The process which gives rise to these bubbles is alcoholic fermentation. 93. Conditions Necessary for Alcoholic Fermentation.â If two other tubes are prepared precisely Kke the first one, except that ice-water is used in one and boiling water in the other, and are set, the first in a cold place {, the refrigerator), and the second in a very warm place, fer- mentation will occur either very tardily or not at all. If a third fermentation-tube is set up with sugar but no. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gager, C. Stuart (Charles Stuart), 1872-1943. Philadelphia, P. Blakiston's son & co.
Size: 1268px × 1970px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorgag, bookcentury1900, bookdecade1910, booksubjectbotany
