Organ donation in the United States: 1988 through 1992.

1. In 1992, 4,521 cadaveric and 2,578 living-organ donors were recovered. This represented an 11% increase for cadaveric donors and a 41% increase in living donors over the number of donors recovered in 1988.

Determination of the specific radioactivity of fatty acids separated as their methyl esters by gas-liquid chromatography.

Free or combined (3)H-labeled fatty acids are converted to their methyl-(14)C esters or, if labeled with (14)C, to their methyl-(3)H esters. For a given specific radioactivity of the methyl group, the nuclide ratio in the esters separated by GLC is a direct measure of the specific radioactivity of the fatty acids, and quantitative collection is unnecessary. Methods of methylation with minimum quantities of labeled methanol, and of deriving nuclide ratios from channel ratios in a scintillation spectrometer, are given.

Studies on the origin of milk fat. A further study of bovine serum lipoproteins and an estimation of their contribution to milk fat.

1. Tritium-labelled palmitic acid combined in olive-oil triglycerides was introduced into the rumen of a lactating cow and the specific radioactivity of the lipids of milk and of the lipoproteins of both jugular and mammary venous serum was measured. 2.

An investigation of serum lipoproteins and of their contribution to mild fat in the dairy cow.

1. Tritium-labelled olive-oil triglycerides were introduced into the rumens of lactating cows and the specific activities of the lipids of milk and plasma and of serum lipoproteins were measured. 2.