Testosterone & lipid metabolism in rabbits.

Testosterone and lipid metabolism was studied in rabbits. The effect of orchidectomy in rabbits fed normal diets and of testosterone propionate administration to these animals on total cholesterol, phospholipids, and triglycerides of serum, liver, aortic arch, thoracic aorta, and abdominal aorta as well as the activity of lipoprotein lipase in the aortic segments and heart was investigated. With a few exceptions, total cholesterol,phospholipids, and triglycerides increased in these tissues in orchidectomized animals and testosterone counteracted this increase. 3 segments of the aorta revealed variations in response to lipids in the orchidectomized animals as well as in the testosterone administered. Lipoprotein lipase activity decreased in the heart and the 3 aortic segments on orchidectomy, and testosterone administration caused increased enzyme activity.     

Free amino acids in seminal fluid & haemolymph of Cimex lectularious L. & their possible role in sperm metabolism

Previously it was shown that glucose and trehalose are present in the hemolymph of Cimex lectularious L. and that the active bed bug sperm can utilize these sugars oxidatively. A study was conducted on the occurrence of amino acids in the seminal fluid and the hemolymph of the bed bug and the enzymes of Cimex sperm concerned with amino acid metabolism. It was determined that the hemolymph contains 12 free amino acids and in the seminal fluid, there are 8. In the Cimex sperm, transaminase activity is limited, with L-alanine the only amino acid involved in transamination. Although it is understood that amino acids constitute a very limited source of energy to the bed bug sperm! an oxidative deamination of L-alanine may occur, since oxygen is available to the sperm and alanine and glutamic acid are present in the seminal fluid and hemolymph.