immobilization of lactase in yeast cells retained in a glass wool matrix

treatment of glass plates by the polycation chitosan allowed the adhesion of kluyveromyces lactis cbs 683 cells. a similar surface treatment was applied to a matrix made of insulation-glass fibers which is a potentially useful support due to its high surface area. a limited amount of cells was retained in the matrix not treated with chito..

theoretical analysis of g6p production and simultaneous atp regeneration by conjugated enzymes in an ultrafiltration hollow-fiber reactor

the performance of an ultrafiltration hollow-fiber reactor, in which the enzymatic synthesis of glucose 6-phosphate from glucose and cofactor atp and the enzymatic regeneration of atp from adp and acetyl phosphate are performed simultaneously, was analyzed theoretically. a simple analytical model in which the liquid flowing in the fiber t..

chemical treatment of jute fibre for improved rot resistance

dewaxed and preswollen jute fiber was subjected to mild bleaching or oxidation using aqueous bleaching agents (h//2o//2, bleaching powder and naio//4) and nonaqueous chlorine (cl//2 in ccl//4) to bring about low changes in the functional groups ( $minus$ cho and $minus$ cooh groups) of the jute fiber to make it amenable to further chemica..

avidin-biotin coupling as a general method for preparing enzyme-based fiber-optic sensors

a general method for preparing enzyme-based fiber-optic sensors is described. three different sensors, capable of detecting penicillin, organic esters, and urea, were developed based on this method. each fiber was constructed first with a layer of polymer containing pendant amino groups that react further with succinimidyl-derivatized bio..

evaluation of surface treatments for glass fibers in composite materials

the thermomechanical stability of a number of organosilane surface treatments for glass fibers were evaluated for use in a fiber reinforced epoxy resin. all of the silane coatings were found to improve the tensile strength of e-glass filaments, particularly at large gauge lengths. a phenylamino silane and an amino silane were particularly..

dielectric anisotropy of nonwoven fabrics by using the microwave method

a new method uses polarized microwaves to determine the fiber orientation of nonwoven fabrics without contact and destruction. the angular dependence of transmitted microwave intensity at 4.0 ghz allows the fiber orientation to be determined in only 30 s. the molecular orientation ratio and the orientation angle changed with changing posi..

temperature-gradient calendering of recycled boxboard

in this study, the tg calendering technique was applied to multi-ply boxboard samples made from 100 recycled fibers. the effects of the following three calendering techniques on the surface properties and bulk of the board were investigated: 1. conventional calendering; 2. two-sided tg calendering; 3. one-sided tg calendering. experimenta..

polymer-modified, carbon fiber microelectrodes as catechol sensors

carbon fibers are used to construct microelectrodes with radii on the order of several microns. square wave voltammetry is employed to assess fabrication quality and to determine effective radii of properly constructed microelectrodes. the water-soluble polymer poly(n-vinyl pyrrolidone) is immobilized on microelectrode surfaces by gamma i..

studies on antimicrobial activity of $beta$ -hydroxynaphthaldehyde as a possible protectant against biodeterioration

the antimicrobial activity of $beta$ -hydroxynaphthaldehyde (hna) was tested against 40 different fungal species isolated from deteriorated cotton, textiles, canvas, paper, book bindings, photographic films, leather, footwear and other similar articles. the concentrations 10-100 $mu$ g/ml were tested by poisoned food technique and 60 $mu$..

fatigue fracture of reaction injection molded (rim) nylon composites

this study was undertaken to determine how milled glass fibers affect the fatigue resistance of reaction injection molded (rim) nylon 6. specifically the effects of glass content, fiber length, orientation, and surface treatment were investigated. the fatigue crack growth rates for unfilled and glass-filled samples were observed to follow..