A text-book of physiological chemistry / Authorized translation from the second Swedish edition and from the author's enlarged and revised German edition by John A. Mandel.

  • Olof Hammarsten
Date:
1893
Catalogue details

Licence: Public Domain Mark

Credit: A text-book of physiological chemistry / Authorized translation from the second Swedish edition and from the author's enlarged and revised German edition by John A. Mandel. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    the cause of coagulation has been just as little proved as the asser- tion that the coagulation of milk in the preparation of cheese is produced by the calcium phosphate becoming insoluble without the action of the rennet ferment on the casein. The untenability of Feeund's theory has been shown by Latschenbergee. According to Dogiel and Holzman]S, the coagulation of the fibrin is an oxidation of the fibrinogen. The relation of oxygen to the coagulation is not quite clear; a certain influence, however, on the coagulation cannot be denied. But as the coagulation may take place also in the absence of free oxygen, the above statement seems not to be well grounded. The very dark and complicated process of the intravascular coagulation and the relationship of the so-called tissue fibrinogen (Wooldeidge) to the same have been so insufficiently studied that we cannot enter here into a discussion of this interesting question. IV. The Gases of the Blood. Since the pioneer investigations of Magnus and Lothar Metee the gases of the blood have been subjects for repeated, care- ful investigations by prominent experimenters, among whom we must mention first C. Ludwig and his pupils and E. Pflugee and his school. By these investigations not only has science been enriched by a mass of facts, but also the methods themselves have been made more perfect and accurate. In regard to these methods, as also in regard to the laws of the absorption of gases by liquids, dissociation, and other questions belonging here, the reader is referred to complete text-books on physiology, on physics, aud on gasometric analysis. The gases occurring in blood under physiological conditions are oxygen, carlon dioxide, and nitrogen. The last-mentioned gas is only found in very small amounts, on an average of 1.8 vol. per cent. The amount is here, as in all following experiments, calculated for 0° C. and 760 mm. pressure. The nitrogen seems to be simply ab- sorbed into the blood, at least in great part. It appears to play no part in the processes of life, and its amount varies but slightly in the blood of different blood-vessels. The oxygen and carbon dioxide behave otherwise, as their
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