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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free.This is an OCR edition with typos.Excerpt from book:CHAPTER VI. PROTEIN REQUIREMENTS. A QUESTION which must now be considered is that of the minimum amount of protein required daily by the body. The subject is one not merely of scientific but also of economic importance.The Protein Minimum.The term protein minimum may be used in two senses either with reference to the lowest output of nitrogen in the urine which can be attained by the ingestion of a nitrogen free diet (experimental minimum) or with reference to the smallest amount of protein which must be ingested not only to allow of a positive nitrogen balance but which will also maintain the organism in a sound physiological condition (practical minimum). The term in its latter sense will be mainly discussed in the present section and the bearing of the former will be found on p. 137.One point must be made clear at the outset, namely, that the search for an absolute minimum is like the search of the philosopher for absolute truth. There is not one minimum but many protein minima—the minimum is a resultant of many factors. Rubner [1903, 1919], Caspari [1905], and others, also hold firmly to this opinion. Rubner has in a series of papers pointed out that the demand by the tissues for protein is not merely to serve one purpose, and that therefore it is logical to refer to a variety of proteins, each of which may bring about alterations in retention and output. He has definitely laid down three purposes which have to be served by the protein ingested (1) to replace wear and tear, (2) for storage and growth, and (3) for dynamic purposes. When an organism is fed on a calorie abundant but nitrogen-free diet of carbohydrate the lowest limit in the output of nitrogen—the amount arising from the wear and tear of the tissues—is reached. If then it be desired to adopt a stan... ... Read more

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The Diary of Robert Hooke, M.A., M.D., F.R.S. 1672-1680. Transcribed from the original in the possession of the Corporation of the City of London (Guildhall Library) ... Read more