polyvinylalcohol - collagen membranes for enzyme immobilization

pva - collagen membranes were prepared by co-crosslinking a mixture of pva - collagen with epichlorohydrin, to obtain membranes 35 $mu$ m thick. best results were recorded with a composition of 6 pva and 6 collagen. carboxymethyl (cm) and aminoethyl (ae) derivatives were obtained by treating the pva - collagen membranes with monochloroace..

electron diffraction study of enzyme-hydrolyzed cotton samples

an electron diffraction study on continuously and repeatedly enzyme-hydrolyzed cotton samples was carried out. the electron diffraction pattern on repeatedly enzyme-treated sample reveals a cellulose i pattern with the absence of the 101 plane. this confirms that enzymatic hydrolysis of cotton fibers proceeds preferentially along the 101 ..

surface finish measurements of diamond-turned electroless-nickel-plated mirrors

surface roughness data are presented for a matrix of diamond-turned electroless nickel samples having a combination of six phosphorus contents and four heat treatments. roughness measurements were conducted with commercial optical and stylus profilers (wyko and talystep). the results are discussed in terms of the material composition and ..

fabrication of reusable enzyme brushes for clinical analyses: lactate dehydrogenase enzyme brush

a simple procedure for the entrapment of enzymes in nylon-reinforced cellulose triacetate fibers and the fabrication of reusable enzyme brushes using such fiber bristles for the analytical determination of unknown samples have been described. as an example, enzyme brushes of lactate dehydrogenase were fabricated and were repeatedly employ..

plating, finishing, and coating: state-of-the-art assessment

many materials, components, and products are not suitable for consumer use directly after fabrication. their surfaces may be too rough or unattractive. they may be too soft or poorly resistant to corrosion or wear. they may have too high a friction coefficient or poor absorptivity and emissivity. thus, some form of surface treatment or co..

die entwicklung organischer polymerwerkstoffe. $left bracket$ the development of organic polymer materials $right bracket$

the development of organic polymer materials is characterized by the combination of different polymers and the formation of compounds with spheric particles (filling) and reinforcement with fibers. it is demonstrated that an efficient combination requires chemical modification to increase compatibility of the interfaces the necessity of t..

stabilization of shielding effectiveness of electromagnetic interference of aluminium fibre and polyamide composites

we have examined the thermal stability of the shielding effectiveness of composites prepared with various conductive fillers and polyamide, nylon 12. we found that in the case of aluminum fiber composites their functional stability was improved remarkably by the surface treatment of the fillers with commercial polymers and oligomers. beca..

uhlikova vlaknas. $left bracket$ carbon fibers $right bracket$

a survey is given of various sorts of carbon fibers and processes employed in their manufacture. major characteristics of each sort of fiber are presented. in conclusion, physical and chemical properties of the fiber surface are described briefly and materials utilized for treatment of the fiber surface are surveyed (author abstract). 14 ..

new strong cement materials: chemically bonded ceramics

new cements developed in recent years have strengths that are greater by an order of magnitude than those of conventional hydraulic cements. these low-temperature materials, whose strengths approach those of many traditional high-temperature ceramics, are termed chemically bonded ceramics. the different routes to generating strong cementi..

quick test for measuring fabric dimensional stability

a test that takes less than one hour as opposed to the conventional one day test is proposed for measuring the relaxation shrinkage and hygral expansion of fabrics. there is no need for a controlled environment, the only equipment required being a household microwave oven and a scaled ruler. the test's simplicity makes it suitable for use..