Abstract
Summary
In the proximal convoluted tubule (its neck protruded epithelium and medullary segment) the presence of large amounts of lipids including triglycerides correlated with the positive reactions for lipase and alkaline phosphatase. If the terminal part of the medullary segment contained little or no fat7 there was little or no indication of the presence of lipase or alkaline phosphatase. In those other regions of the tubule where lipids were scant or absent, there were slight or no reactions for lipase and none for alkaline phosphatase with the exception of the free surface of the first part of the ascending limb of the loop of Henle which gave a positive reaction. Protrusions of tubular epithelium into the capsular space were common in the kidneys of old cats.
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