Directed Regulation of Biological Activity of Multicomponent Polymeric Structures

Biological activity of multicomponent polymeric films based on polyvinyl alcohol, polyvinylpyrrolidone, and lactic acid, containing trypsin and kanamycin, is studied. The degrees of degradation and biodegradation of multicomponent film coatings can be controlled by introduction of polyvinylpyrrolidone or lactic acid and also by variation in their electroforming parameters.     

Energy of vented gases as a means for improving product purity during swing adsorption

The equilibrium swing adsorption model is used to show that the purity of the product gas linearly increases with decreasing the ratio of the gas pressure during the recovery stage to the gas pressure during the adsorption step. We propose to use the energy of the vented gas for decreasing this ratio through ejecting the vented gas flow. A fundamentally new swing adsorption flowsheet with a gas ejector is proposed.     

Surface composition of native gold and Ag/Au alloys

The surface composition of Ag/Au alloys has been studied by X-ray photoelectron spectroscopy (XPS). Surface segregation of Ag is observed, particularly for alloys having low Ag content. The content of Ag in the first surface monolayer is in accordance with data from ion scattering and with a theoretical model for segregation in ordered solutions. The surface of native gold was found to be enriched with silver in the case of mine gold, and the degree of segregation was significantly higher than for an alloy having similar bulk composition. The surface of mine gold taken from an oxidized zone contained less silver than did that of usual mine gold. The surface of placer gold was depleted of silver as compared to the bulk. These data show the surface composition of native gold to differ markedly from that of an alloy having the same bulk Ag content, and to depend on the genesis of the native gold sample.     

Deep inelastic neutrino interactions in the bubble chamber skat at 2–30 GeV

Data on inclusive deep inelastic neutrino interactions at 2–30 GeV are presented. Distributions in x, y and 〈Q²〉 dependence on neutrino energy are compared with quark-parton model predictions. The 〈Q²〉 dependence on energy has the form: 〈Q²〉 = (0.2 ± 0.1) + (0.25 ± 0.02) E_v.