novel hollow-fiber reactor with reversible immobilization of lactase

experimental and theoretical studies on a backflush hollow-fiber enzymatic reactor (hfer) were conducted in this work for a lactose/lactase system. an a. niger lactase was chosen, from the four lactases tested, for reversible immobilization in the sponge layers of the fibers. an enzyme loading procedure was developed that allowed reliable..

immobilization of glucoamylase in porous glass fibers

glucoamylase has been successfully immobilized in controlled pore glass fibers by a silane-glutaraldehyde coupling method. enzyme solution was continuously recycled through the glass fibers held in a fixed bed reactor. different process parameters were tested reservoir volume and initial enzyme concentration both had a strong influence on..

failures after sun exposure

this paper concerns the delamination of some metal-skin panels - after exposure to sunlight and high temperatures; dark surfaces fared worse than light colors. the likeliest reason was the actual method of fabrication, for which further study and perhaps regulatory control should be welcomed, it is suggested. with a computer program, diff..

nylon fiber reinforcement to polyurethane composites

the potential of a nylon 6 fiber was evaluated from composite applications involving rigid polyurethane systems. a study showed that the use of compet n, a nylon 6 based fiber surface treated to enhance wetout and adhesion, in an isp polyurethane system results in composites with higher impact values and lower weight than those reinforced..

microelectronic conductimetric biosensor

the fabrication and operation of a microelectronic conductimetric biosensor is described. the device monitors the change in solution conductance occasioned by the catalytic action of enzymes immobilized over a planar conductance cell comprizing serpentined and interdigitated metal conducor tracks. the output of the instrument was liner ov..

polymer immobilized enzyme optrodes for the detection of penicillin

the preparation and performance of two enzyme-based fiber-optic sensors (optrodes) capable of detecting penicillin are described each sensor consists of a polymer membrane that is covalently attached to the tip of a glass optical fiber. the membrane contains the enzyme penicillinase and a ph-sensitive fluorescent dye. the sensors differ i..

stock bonding problem: a macro investigation of micro flaws in mil-spec boards

current manufacturing technology used to fabricate polyimide pcbs has evolved from processes used to make epoxy boards. these processes have been found to give variable bond quality between innerlayer traces/planes and the polyimide b-stage material. results of studying standard oxiding and several novel surface treatments demonstrated th..

preparation of fibres modified with enzymes having milk-curdling activity and their properties

conditions have been found for preparing enzyme-containing fibers with milk-coagulating activity. the effect of the type of carrier fiber, the character and content of functional groups, the disposition of these with respect to the main polymer chain, and also of the enzyme concentration on the milk-coagulating activity of enzyme-containi..

stabilized polyethylenetherephthalate strength

the field of polyethylene therephthalate (pet) application may be extended by chemical modification resulting in an increase of its film and fiber strength. the modern theory of polymer mechanical fracture makes it possible to determine the proper ways of pet strengthening. the aim of the present paper is to consider one of the most impor..

study of the surface of carbon fiber by means of x-ray photoelectron spectroscopy - ii

this paper reports a study of the surface composition of carbon fibers treated by various methods by means of x-ray photoelectron spectroscopy (xps). c//1//sx-ray photoelectron spectra showed that after the surface treatment of carbon fibers, the carbon atoms in the hydrocarbon were changed into oxygen-containing groups, that is, the resu..