Manual of Clinical Chemistry

9781154991802: Manual of Clinical Chemistry

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 edition. Excerpt: ...hours. As soon as the process is complete, the precipitate rapidly settles, and it is best to draw off a drop or two from this clear supernatant liquid and test it carefully again. We may also check our work by running in another drop of the silver solution, to see if it produces a cloud, or to see if the precipitation be complete. As there is no excess of silver in the hot liquid at any time, there can be no reduction of silver. If, after the titration is complete, the solution be cooled, it will usually be found that it will require from I to 3 c.c. of the silver solution to again produce the end reaction, because of the precipitation of the xanthin bases as silver compounds. The formula of the xanthin-silver compound is Ag2O.C5H4N402. The factor for the N--AgN03 solution is 0.0015--that is, if we calculate them all as xanthin, each c.c. of silver solution used in the cold solution, more than is required by the hot solution, corresponds to the above amount of xanthin bases. By making two titrations, the one in the hot and the other in the cold urine, we may estimate both the uric acid and the xanthin bases, the latter by the difference in the results of the two titrations. ABNORMAL CONSTITUENTS OF URINE. These are albumin, globulin, albumose, peptone, glucose, acetone, diacetic acid, bile-coloring matters, biliary acids, blood, blood-coloring matters, pus, chyle, and abnormal sediments, such as tube-casts, excessive amount of epithelium cells, mucus, etc. Albumin.--Albumin is found in the urine, at times, without apparent disturbance of health. Usually, however, it is regarded as pathological, and is so often associated with various inflammatory diseases of the kidney that its presence is often taken as evidence of some one of these...

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