chemical modification of fiber-forming polymers based on recombination addition reactions

the essence of chemical modification processes of fiber-forming polymers based on recombination addition reactions involves preliminary sorption of low-molecular components by the fiber being in a high elasticity state with the subsequent transfer of interacting substances into a free radical state as a result of chemical or radiation ini..

identification of a key enzyme in the digestion of wool by larvae of the webbing clothes moth, tineola bisselliela

an important step in the digestion of wool by certain insect pests is the reductive cleavage of protein disulphide bonds to open the fibre for protease action. for larvae of the webbing clothes moth, tineola bisselliella, two enzymes have been suggested as being involved in this process, cystine reductase and cysteine lyase/desulphydrase...

ion exchange of lysozyme during permeation across a microporous sulfopropyl-group-containing hollow fiber

a microporous hollow fiber containing a sulfopropyl (sp) group as a strongly acidic cation-exchange group was prepared by radiation-induced graft polymerization of glycidyl methacrylate, followed by hydrolysis of the resulting epoxide group into a diol, and then conversion of the diol into the sp group. the sp group density of the resulti..

large-scale production and purification of $kappa$ -carrageenase from pseudomonas carrageenovora for applications in seaweed biotechnology

cultures of pseudomonas carrageenovora were grown successfully in a stirred-tank fermentor system suitable for scaled-up conditions improved production of the enzyme $kappa$ -carrageenase was obtained by starting bacterial growth on a cheap carbon source (lactose) and adding small amounts of carrageenan (0.15) to initiate enzyme productio..

performance of hybrid reinforcements in pvc composites: part i use of surface-modified mica and wood pulp as reinforcements

in the present study, the hybrid behavior of surface-treated mica and hardwood chemithermomechanical pulp (ctmp) in pvc composites was investigated. in order to improve the compatibility of wood fibers with pvc and surface-coated mica, ctmp was subjected to different surface modifications by pretreating the fibers with maleic anhydride (m..

changes in physical properties, hand and supermolecular structure of cuprammonium rayon by enzyme treatment

an attempt was made to study changes in test strength, abrasion strength, hand and supermolecular structure of cuprammonium rayon fabrics and filaments by enzymatic hydrolysis with aqueous solution of the cellulase. for this purpose, the plain fabrics of cuprammonium rayon were treated with immersion process or pad roll process by using a..

preparation of microfiltration membranes containing anion-exchange groups

anion-exchange groups were introduced into an existing microfiltration membrane by radiation-induced grafting and subsequent chemical modification. the tertiary-amino-group-containing monomers, i.e. diethylaminoethyl methacrylate (deaema) and vinyl pyridine (vp), and epoxy-group-containing monomer, i.e, glycidyl methacrylate (gma), were g..

external grinding of the quenched carbon steel (s55c)

this work deals with the evaluation of ceramic-fiber reinforced plastics as a grinding tool for various work materials. the composites were manufactured by mixing continuous alumina-fiber of definite diameters and thermosetting resin as a bond material. the characteristics of frp tool as a grinding tool (volume fraction of fiber: 60, fibe..

acceleration of ethanol production from paper mill waste fiber by supplementation with $beta$ -glucosidase

ethanol production through simultaneous saccharification and fermentation (ssf) is discussed, in which paper mill waste fiber (wf) from the ammonium sulfite pulp process was used. the process was improved by the supplementation of the cellulase from penicillium decumbens ju-a10 with the $beta$ -glucosidase-rich cellulase from aspergillus ..

new methodology for the characterization of endoglucanase activity and its application on the trichoderma longibrachiatum cellulolytic complex

the cellulolytic complex of trichoderma longibrachiatum was separated into nine fractions using fplc. the avicelase, cellobiase, carboxymethylcellulase, and endoglucanase activities of these fractions were characterized. the endoglucanase activity was measured by a method that allows the determination of the variation of the degree of pol..