Effects of Polypeptide and Protein Hormones on Lipid Monolayers
نویسندگان
چکیده
Insulin in low concentrations inhibits the uptake of Ca(++) by the monooctadecyl (stearyl) phosphate monolayer (at air-water interface) and facilitates the release of Ca(++) adsorbed to the monolayer. These effects of insulin are more pronounced at higher insulin concentrations. Evidence is presented that a relatively intact insulin molecule competes with Ca(++) for the free phosphate group of the monolayer. Albumin has a slight inhibitory action on calcium uptake and parathyroid hormone has no observable action on calcium uptake or release.
منابع مشابه
Growth and hematological changes of Aspikutum, a hybrid of Leuciscus aspius female (Linnaeus, 1758) × Rutilus frisii male (Kamensky, 1901), fed rations with various protein to lipid ratio
A 60-day trial with six diets (three different protein levels × two different lipid levels) containing 30, 35 and 40% protein with 10 and 15% lipid levels was conducted to determine the optimum dietary protein to lipid ratio and effects on growth performance and hematological indices of Aspikutum, Leuciscus aspius female×Rutilus frisii male. Two hundred and fifty two fish (31.2±0.4 g; mean±SEM)...
متن کاملEffects of Different Levels of Protein, Lipid and their Interaction on Growth Factors of Indian White Shrimp (Fenneropenaeus indicus) Post Larvae
Three experiments of 60 days duration were conducted in post larval stage of Indian white shrimp, Fenneropenaeus indicus, to explore the appropriate protein: lipid ratios in their diets. A common ingredient mixture consisting of; fish meal, shrimp meal, ground nut oil cake, cholesterol, lecithin, vitamins and minerals blended with chicken egg albumin, tapioca flour and cellulose (filler) was us...
متن کاملاثرات میدان الکترومغناطیسی تلفن همراه بر عملکرد تک نانوکانال پروتیینی OmpF: یک رویکرد تجربی
Background: Widespread of telecommunication systems in recent years, have raised the concerns on the possible danger of cell phone radiations on human body. Thus, the study of the electromagnetic fields on proteins, particularly the membrane nano channel forming proteins is of great importance. These proteins are responsible for keeping certain physic-chemical condition within cells and managin...
متن کاملEffects of Probiotic and Chromium-Methionine on Thyroid Hormones, Total Protein, Zinc, and Weight Gain in Dairy Holstein Calves During the Weaning Period
BACKGROUND: Many additives have been recommended to calf feed but the effects of each supplement have been under investigation especially during weaning stress. OBJECTIVES: The effects of dietary supplementation of probiotic (Protexin) and chromium-methionine che- late (Cr-Met) on triiodothyronine (T3), thyroxine (T4), total protein, albumin, zinc, and gr...
متن کاملInsertion of the amyloid precursor protein into lipid monolayers: effects of cholesterol and apolipoprotein E.
APP (amyloid precursor protein), together with Chol (cholesterol) and ApoE (apolipoprotein E), has been linked to Alzheimer's disease. We have examined the hypothesis that interaction of APP with the lipid membranes is modulated by Chol and ApoE. Insertion of APP into lipid monolayers was first evidenced as an increase in the surface pressure. APP injected into a subphase induced a substantial ...
متن کامل