1. Invertase ist salzempfindlich nur in Gegenwart von Kolloiden, wie Gelatine, Albumin, Globulin, Lecithin; ihre Aktivität wird dabei durch die Salze herabgesetzt. 2. An den Komplexen Invertase-Globulin und Invertase-Lecithin lässt sich eine Ionenaequilibrierung von der Art des physiologischen Kationenantagonismus nachweisen; Na und K einerseits, Mg, Ca, Sr, Ba, Al, La andererseits hemmen in ge...

To study the effect of fatty acid chain saturation on the fluorescence polarization assay as a measure of fetal lung maturity, we used purified phospholipids isolated from human amniotic fluid and various commercial phospholipids. We found that the fluorescence polarization value decreased as the concentration of unsaturated fatty acids increased. In contrast, the lecithin/sphingomyelin ratio i...

Recent studies have identified a potential role for glucosylceramide (GlcCer) in growth promotion and hormonal signalling. In an effort to demonstrate a growth-promoting activity of GlcCer, we prepared a GlcCer having a short-chain acid (octanoyl), in the belief that this glycolipid could be absorbed more readily and more uniformly by cultured cells. By using a mixture of two specific lecithins...

Although acetylenic acids are not normally found in mammalian tissues, octadecynoyl-CoA esters can serve as substrates for rat liver microsomal acyl-CoA: phospholipid acyltransferases. The relatively high rate of transfer to the 2-hydroxyl of I-acylglycerol-3-phosphorylcholine by the 5-, 9-, and I2-positional cis, tram and yne isomers of acids supports the concept that n-bonds at these position...