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Summary1. Elinin, a lipoprotein fraction of the red cell exhibiting Rh activity has been isolated in relatively pure form largely by physical methods.2. Injection of elinin from Rh positive cells into animals has so far failed to yield a measurable titer of anti-Rh antibodies.3. Injection of elinin into human subjects who have been sensitized to the Rh factor by pregnancy or transfusion failed to increase the titer of Rh antibodies in the serum. Two of the subjects injected showed subsequent response to injection of whole Rh positive cells.4. Injection of 1 to 1.5 g of active elinin intramuscularly failed to effect a change in titer of circulating antibodies.

SummaryMouse brains were extracted with a variety of solutions composed of inorganic salts, organic solvents, or mixtures of each. During these experiments, it was noted that a differential effect of certain salts and solvents on isozyme patterns could be demonstrated. These effects of isozyme systems [lactic dehydrogenase (LDH) and nonspecific esterase] could best be explained on the basis of lipid-enzyme complexes. Circumstantial evidence is provided for viewing LDH as a lipoprotein catalyst.

SummaryIt has been demonstrated with the use of a functionally hepatectomized preparation and in the presence of a lipoprotein lipase inhibitor, Triton WR 1339, that, in the chicken, long chain fatty acids are absorbed in the form of triglycerides as the major component of a lipoprotein of density less than 1.006.

SummaryΔ1-Testololactone administration caused no protein anabolic or androgenic effects in 4 subjects. Serum cholesterol and phospholipid levels fell, however, as did a lipoprotein lipids in three. The a lipoprotein effect is typical of testosterone and suggests a separation of lipoprotein from androgenic-anabolic properties in a testosterone derivative