Journal of Applied Physiology
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J Appl Physiol 14: 1005-1008, 1959;
8750-7587/59 $5.00
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Density, fat, water and solids in freshly isolated tissues

T. H. Allen 1, H. J. Krzywicki 1, and J. E. Roberts 1

1 U.S. Army Medical Research and Nutrition Laboratory, Denver, Colorado

Once the initial density, D1, is noted, a single piece of freshly isolated mammalian tissue is analyzed for water and fat. Knowing the densities of water and fat, the tissue's fat-free density, D2, and the dry, fat-free density, D3, can be computed. Among the various types of soft tissues, since D3 is similar, a simple relationship is shown to exist between the fat-free water content and the corresponding density. The biological extremes in a water:fat:protein system thus operate in such a way that the quantity of fat can be predicted from an equation containing three variables, i.e. the initial weight and density of a tissue and its quantity of water. This is of interest in human body composition and also to those who desire to make a sequence of determinations on a single piece of tissue without having to submit a portion thereof to direct analysis of fat, e.g. to express tissue electrolytes and water content on the fat-free basis.

Submitted on June 15, 1959




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