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Updated: June 3, 2025
This statement, with all due deference to the opinion of our illustrious critic, is by no means correct. Yeast has no action on malate of lime, or on other calcareous salts formed by vegetable acids. Liebig had previously, much to his own satisfaction, brought forward urea as being capable of transformation into carbonate of ammonia during alcoholic fermentation in contact with yeast.
If now two or three marks have been made upon the tube, B, indicating the height of the mercury when solutions containing known per cents. of urea are used, an accurate opinion can be at once formed as to the condition of the urine as regards urea.
If one is in a weakened condition, the uric acid may fail to be oxidized to urea, as occurs normally, or to be thrown off as uric acid. In this case it accumulates in the body, causing rheumatism and related diseases. It thus happens that while some people may use tea and coffee without detriment, others are injured by them.
These compounds are carried by the blood to the organs of excretion, where they are removed from the body. The water leaves the body chiefly as a liquid, the urea as a solid dissolved in water, and the carbon dioxide as a gas. The passage of carbon dioxide through the blood requires special consideration. Each moves from a place of relatively high to a place of relatively low pressure.
Nay, they would not even be in the least painfully affected at witnessing the generation of animals of complex organization by the skilful artificial arrangement of natural forces, and the production, in the future, of a fish by means analogous to those by which we now produce urea.
In the muscular tissue, and in the other tissues as well, the proteids are reduced to a lower order of compounds, such as the compounds of ammonia, which pass into the blood and are then taken up by the liver. By the action of the liver cells these are converted into urea and this is turned back into the blood. From the blood the urea is separated by the secreting cells of the kidneys.
Now if we omit an estimate of the undigestible remains of the food, we find that the main bulk of what daily leaves the body consists of water, carbon dioxid, and certain solid matters contained in solution in the renal secretion and the sweat. The chief of these solid matters is urea, a complex product made up of four elements, carbon, hydrogen, oxygen, and nitrogen.
They are a part of the equipment which enables us to adjust our selves to our environment. The secretions and excretions are perspiration and sebum. These contain water, carbonic acid, urea, buturic acid, formic acid, acetic acid, salts, the chief being sodium chloride, and many other substances.
Augmentation of assimilation. 2. Reduced disassimilation. In the former, he insists water must be interdicted, while in the latter it may be allowed ad libitum. Again, in order to recognize the exact variety of obesity, he divides his patients into three classes, each recognizable by the volume of urea excreted.
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