chemical biosensors and on-line patient monitoring

this brief review is restricted to chemical sensors that are suitable for the direct monitoring of clinical data and, therefore, potentially valuable as diagnostic tools, but that are not yet in widespread use (i. e. , primarily ion-selective and enzyme sensors) the use of integrated-circuit technology for the fabrication of chemfet devic..

catalytic initiation of polyacrylonitrile stabilization

a catalytic surface treatment of polyacrylonitrile fibers by dibutyltin dimethoxide is investigated as to its capacity of facilitate the stabilization of the fibers to produce a satisfactory carbon fiber precursor. the stabilization is based on a combination of the catalytic treatment step and of the usual thermal oxidation step which fol..

introduction of biomaterials into contemporary medical practice

the methods by which biomaterials have been and are currently being introduced and accepted into clinical medicine have varied historically and, in part, are dependent upon the device. the materials employed in the vast number of medical devices have long been in common use elsewhere and have simply been used in a different application. t..

acetalization of polyvinyl alcohol fibres with glutaraldehyde

the authors describe studies of the acetilization of pvc fiber with glutaraldehyde (ga). the latter is widely used to cross-link protein molecules and also to immobilize enzymes. it is found that essentially shrink-free polyvinyl alcohol fibers have been obtained by acetalizing them with glutaraldehyde. the free aldehyde group content of ..

vliyanie obrabotki poverkhnosti tsirkoniisoderzhashchego steklovolokna na ego shchelochestoikost'. $left bracket$ effect of surface treatment of zirconium-containing glass fiber on its alkali resistance $right bracket$

a study was made of the effect of surface treatment of glass fiber with beryllium acetate and polyisobutylene on the stability of the glass in a solidifying cement medium. it was found that a polyisobutylene film does not protect glass fiber from alkali corrosion. after glass fiber was treated with a 1 aqueous solution of beryllium acetat..

chemical modification of electrochemically oxidized and partially rereduced carbon fibre electrodes

carbon fiber electrodes (residual graphite oxide fibers) electrochemically oxidized and partially rereduced in concentrated h//2so//4 have excellent cation-exchanging properties. chemically modified carbon fiber electrodes have been prepared by na** $plus$ -exchange of residual graphite oxide fibers and subsequent action of chlorocompound..

die grenzflaeche zwischen faser und harz aus chemischer sicht $left bracket$ interface between fiber and matrix resin from a chemical point of view $right bracket$

in a composite material the chemical structure of a fiber surface is influencing the adhesion between carbon fiber and matrix resin. the quantity of oxidic groups, fixed on the fiber surface, is a governing factor. surface examinations of commercial carbon fibers and research into sizings are giving first informations about the sizing str..

evaluation of a double lap composite clamped joint

double lap joints consisting of $left bracket$ 0//5/90//5 $right bracket$ //2//s, $left bracket$ 90//5/0//5 $right bracket$ //2//s and $left bracket$ $plus$ 45//5/ $minus$ 45//5 $right bracket$ //2//s graphite-epoxy laminates clamped between metal were pulled to failure in tension. the clamp load, loading rate and surface finish of both t..

hydrolysis of xylan and fermentation of xylose to ethanol

the focus in the development of pulping processes has usually been exclusively on cellulose. however, hemicellulose could serve as a valuable source of hexose and pentose sugars. consequently, it should not be destroyed in a process designed for very high cellulose fiber yields. novel procedures developed for production of ethanol by the ..

recycle hollow fiber enzyme reactor with flow swing

the hollow fiber enzyme reactor with pulsation developed by i h. kim and h. n. chang (1983) was operated in a differential mode by recycling a substrate solution, in order to assess the efficiency of ultrafiltration swing. the rates of lactose conversion by $beta$ -galactosidase contained in the shell side of the reactor were measured to ..