Compatibility Estimation of Oligobutadienediol with Simple Oligoetherpolyols for Molded Polyurethane Compositions Development
This article includes the results of compatibility of oligomeric hydroxyl-containing butadienerubber with oligoetherpolyols on the basis of propylene oxide (Laprols). The compatibility limits of liquid hydroxyl-containing butadiene rubber of Krasol LBH-3000V brand with polypropyleneglycols of Laprol brand with different molecular weights were determined.
Oligomers Solidification Depending on the Nature, Molecular Mass, Type and Reactional Group Containing
The article is devoted to regularity defining of curing oligomers, and prepolymers with hydroxyl and isocyanate groups and double bonds reactive oligomers. The features of the spatial structure of elastic polyurethane based oligomers and prepolymers with the definition of the physical and chemical bonds share, as well as the chain interval length between grid points were researched. The possibility of oligodiendiole curing in the presence of a methacrylate component on the mechanism of radical polymerization was experimentally confirmed. To achieve the objectives rheokinetic method of analysis (rotational viscometer), thermometric and iodometric methods, IR spectroscopy, differential scanning calorimetry were used.
Glycogen phosphorylase in lobster hepatopancreas: action of proteases on the enzyme
Abstract 1. 1. In lobster hepatopancreas, extracellular protreases cause the inactivation of glycogen phosphorylase. 2. 2. The proteolysis of glycogen phosphorylase purified from rabbit muscle by these proteases has been shown by SDS-polyacrylamide gel electrophoresis. 3. 3. A cell isolation technique has allowed us to remove proteases of extracellular digestion and to measure glycogen phosphorylase activity in lobster hepatopancreas. 4. 4. The glycogen phosphorylase activity seems to be mainly associated with R cells while it could not be detected in B cells.