Practical physiological chemistry; a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . acid (as KSCN) 0-15 Indican Ammonia 1 Sodium chloride i Phosphoric acid 2-5 0-15 Total sulphuric acid^ 2-5 1 Silicic acid Potassium (K2O) 2-5 i 1 Sodium (NajO) 5-0 0-3 Calcium (CaO) 0-015 Iron • o. 005 o. 0004 1 For data as to partition of sulphur and nitrogen, see Chapter XXVII on Metabolism. 372 PHYSIOLOGICAL CHEMISTRY NHoUREA, C = 0. NHo Urea is the principal end-product of the metaboHsm of p
Practical physiological chemistry; a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . acid (as KSCN) 0-15 Indican Ammonia 1 Sodium chloride i Phosphoric acid 2-5 0-15 Total sulphuric acid^ 2-5 1 Silicic acid Potassium (K2O) 2-5 i 1 Sodium (NajO) 5-0 0-3 Calcium (CaO) 0-015 Iron • o. 005 o. 0004 1 For data as to partition of sulphur and nitrogen, see Chapter XXVII on Metabolism. 372 PHYSIOLOGICAL CHEMISTRY NHoUREA, C = 0. NHo Urea is the principal end-product of the metaboHsm of proteinsubstances. It was formerly believed that about 90 per cent of thetotal nitrogen of the urine was present as urea. Folin, however, hasshown that the distribution of the nitrogen of the urine amongurea and the other nitrogen-containing bodies present depends entirelyupon the absolute amount of the total nitrogen excreted. He foundthat a decrease in the total nitrogen excretion was always accom-panied by a decrease in the percentage of the total nitrogen excretedas urea, and that after so regulating the diet of a normal person as to^. Fig. 118.—Urea. cause the excretion of total nitrogen to be reduced to 3-4 grams in 24hours, only about 60 per cent of this nitrogen appeared in the urine as experiments also seem to show urea to be the only one of the nitro-genous excretions which is relatively as well as absolutely decreased as aresult of decreasing the amount of protein metabolized. This sameinvestigator reports a hospital case in which only per cent of thetotal nitrogen was present as urea and about 40 per cent was present asammonia. Morner had previously reported a case in which but cent of the total nitrogen of the urine was present as urea, and cent was present as ammonia. Urea occurs most abundantly in the urine of man and carnivoraand in somewhat smaller amount in the urine of herbivora; the urineof fishes, amphibians, and certain bird
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiochem, bookyear1916
