A BST RA CT The oxidation and turnover of plasma glycerol has been studied in lean and obese, fed and starving man by means of a long-term infusion of glycerol-"4C, and the participation of glycerol in gluconeogenesis has been determined.Under none of the experimental conditions did glycerol contribute more than 10% of the total respiratory C02. Glycerol turnover in fed lean subjects was 106 mmoles/min. Glycerol levels and turnover were higher in the obese subjects and with all subjects after starvation. There was a direct correlation between plasma levels and turnover values for which a regression equation was derived: y = 1556 x + 33.1, when y= turnover in micromoles per minute and x = glycerol level in micromoles per milliliter.Whereas a. direct relation was established between glycerol and FFA levels, the FFA/glycerol turnover ratio was 4.7: 1 in the lean group indicating incomplete hydrolysis of adipose tissue triglycerides.
SUMMARY
The sterol composition of several varieties of seafood was assayed by gas‐liquid chromatography. Cholesterol is the major sterol (over 90%) in haddock, pollock, salmon, shrimp, and lobster. The predominant sterols in oyster are cholesterol (41%) and 24.methylenecholesterol (26%), and in crab the major sterols are cholesterol (57%) and brassicasterol (37%). Scallop and clam contain a large number of sterols, the predominant one being cholesterol (26 and 37%, respectively). The sterols other than cholesterol give different chromogens in the calorimetric analysis for sterols, which may account in part for the variability in the “cholesterol” values found in the literature.
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