On the renal balances for different lipid fractions in dog.

(1) Six dogs were kept fasting for 12 h and the uptake or release of various lipid fractions by the kidney was determined. (2) Free and esterified fatty acids were generally taken up during the fasting state. More fatty acids were taken up than could be oxidized with respect to the normal oxygen consumption of the kidney. (3) When glucose was infused a release of fatty acids was observed in general. (4) The critical role of endogenous fatty acids for the energy metabolism of the kidney is pointed out.