American journal of physiology (1898) (14596540879)

Identifier: americanjourna04ameruoft (find matches)

Title: American journal of physiology

Year: 1898 (1890s)

Authors: American Physiological Society (1887- ) American Physiological Society (1887- ). Abstracts of papers presented at the fall meeting American Physiological Society (1887- ). Proceedings

Subjects: Physiology Physiology

Publisher: (Bethesda, Md., etc.) American Physiological Society (etc.)

Contributing Library: Gerstein - University of Toronto

Digitizing Sponsor: University of Toronto

Text Appearing Before Image:

n which the extra protein was simply added to thediet, the rate of excretion did not fall back to that of the first daysbut continued sensibly higher throughout the remainder of theexperiment. Taking into account this increase, which is discussedbeyond in connection with the nitrogen balance, it appears that theimmediate effect of the protein ingested had disappeared at the endof 39 hours. Graffenberger (/(?c. ^zV.), adding to an otherwise uniform diet enoughfibrin to supply 5 grams of nitrogen, found the maximum increase inthe third and fourth hours, after which the excretion declinedsteadily but did not reach the normal until after about 2/j hours. Inall about one-half the added nitrogen was recovered by Graffenbergerin the urine, whereas in the experiments here reported about four-fifths of the added nitrogen was thus recovered. That a longer timewas required both to reach the maximum and to regain the normalin Elimination of Nitrogen, Sulphates, and Phosphates, 43 240- 20 21 23 24

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Fig. 2. The curves here shown represent the relative fluctuations in the average rates ofexcretion of nitrogen and vSOg. The values on the left represent percentages of anassumed standard rate of excretion for each of these constituents. The use of solid andbroken lines and the representation of periods of time are the same as in Fig. i. Itwill be seen that in general the excretion of sulphates ran quite closely parallel to thatof nitrogen. The divergences which occur are discussed in the text. our experiments is probably due to the much larger amount ofnitrogen metabolized. Sulphates. — In general the excretion of sulphates ran closelyparallel to that of nitrogen both on the normal days and on thoseaffected by the extra ingestion of protein. On close examination,however, it appears that the relative increase of SO3 as comparedwith that of nitrogen is somewhat less in the first period following theingestion and a little greater in the third. After reaching the maxi-mum the rate of e

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1898

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