This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 Excerpt: ...the general tissues of the vstem, as in plants, are to a greater or less extent concerned in performing the same function. It may, in fact, be said that the cells of all living tissues, whether of plants or animals, in the exercise of their vital activities elaborate zymases as required in the complex metabolism of the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 Excerpt: ...the general tissues of the vstem, as in plants, are to a greater or less extent concerned in performing the same function. It may, in fact, be said that the cells of all living tissues, whether of plants or animals, in the exercise of their vital activities elaborate zymases as required in the complex metabolism of the processes of nutrition. Scbutzenberger on Fermentation, p. 273. The first step in the fermentation of starch and cane sugar, -which is the work of a soluble ferment (zymase), seems to be identical with the first step, of the germination of seeds, of the transformation of the reserve materials in the growth of the seed stalk in tuberous roots, and of animal digestion. In these nutritive processes of plants and animals, heat is liberated as one of the constant results of the metabolism of the cells in the exercise of their vital activities. The heat developed by plants, as an incident of their nutritive processes, is not noticeable under ordinary conditions, as it is obscured by the constant loss of heat from evaporation. Under special conditions, where the loss from evaporation is reduced to a minimum, and the plants are massed in an atmosphere saturated with moisture, the heat evolved becomes sensible and is readily detected. Under the old physiological theories many of the changes taking place in the tissues, or nutritive materials, were erroneously attributed to a process of oxidation. For example, respiration was assumed to be a combustlve process of oxidation, in which the carbonic acid exhaled was formed by the direct union of carbon with the inhaled oxygen. It is now known that the carbonic acid of respiration is formed in the destructive metamorphoses of the tissues, and not by the direct combination of oxygen with carbon, as in ordinar..
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