fiber optic biosensor based on fluorometric detection using confined macromolecular nicotinamide adenine dinucleotide derivatives

a novel type of fiber optic biosensor is presented. a miniaturized fiber optic fluorometer is combined with a solid membrane reactor that retains enzymes (dehydrogenases) as well as macromolecular adenine dinucleotide coenzyme derivatives, e.g. peg(mw 20000)-n**6-(2-aminoethyl)-nad(h), in the direct vicinity of the sensor tip. the whole s..

phenolic-triazine resins yield high-performance thermoset composites

properties of newly developed pt resins and their composites are reviewed with emphasis on flame resistance, structure/property relationships, curing conditions, and pyrolysis products. pt resin technology is based on the thermally and chemically stable triazine network derived from the cyclotrimerization of cyanate ester groups, as oppos..

effects of age on contractile, morphometrical and enzymehistochemical properties of the rat soleus muscle

the present study was undertaken with the aim of elucidating the mechanisms behind the age-related decrease in maximum force, the decreased speed of contraction and the decrease in fast-twitch muscle fibre number in old rat soleus muscle. this muscle was studied with regard to contractile, morphometrical and enzyme-histochemical propertie..

effect of surface treatment on the electrical properties of metal contacts to boron-doped homoepitaxial diamond film

both doped and undoped homoepitaxial diamond films were fabricated using microwave plasma-enhanced chemical vapor deposition (cvd). the conductivity of the diamond film is strongly affected by the surface treatment. in particular, exposure of film surface to a hydrogen plasma results in the formation of a conductive layer which can be use..

computer-controlled polisher for advanced fabrication

the authors report the development of a new computer-controlled polisher (ccp) that produces exceptionally low mid-frequency error (approximately 35 angstrom rms), has been used to correct figure errors of less than mm period, has held an optic's surface to better than 0.02 $lambda$ p-p to within 2.0mm from the edge of an optic, and has p..

high-performance ion-implanted mes-fet on inp using enhanced barrier self-aligned schottky gate

summary form only given. an enhanced barrier schottky diode with a barrier height of 0.78 ev and an ideality factor of 1.04 was fabricated by chemically modifying the surface of inp without the aid of a dielectric layer. this process involves the solution treatment of the inp surface. the presence of ruthenium on the surface was determine..

novel photoreactive amphiphile of nitrophenylazide for immobilization of bioactive proteins

monolayers of an amphiphilic nitrophenylazide (anpa) derivative were prepared and their ability to immobilize a protein molecule by a photochemical binding reaction was demonstrated as a novel means to constitute a biofunctional membrane. molecular orientations and photoreactions in the anpa monolayers were investigated by fourier transfo..

stress transfer by shear in carbon firbe model composites. part 1. results of single-fibre fragmentation tests with thermosetting resins

the fragmentation of an embedded single filament has been carried out for a number of carbon fibres and resins in order to determine the ability of the interface to transfer shear stresses at the fibre-matrix interface. modifications have been introduced in the shape of a two-step embedding process so as to extend the standard method to b..

modification of paper properties by the pretreatment of pulp with saccharomonospora viridis xylanase

the thermophilic actinomycete saccharomonospora viridis was found to produce extracellular xylanase activity in the absence of detectable activity against cellulose. this property was exploited by the application of crude enzyme preparations to birchwood pulp and resulted in the selective removal of approximately 20 of the total xylan pre..

optical fibre damage detection for an aircraft composite leading edge

recent developments towards the development of a fibre optic damage detection system for composite materials are described results of experiments designed to measure the influence of optical fibre orientation and depth on the sensitivity of the system are reported and optimal configurations have been determined for both. a surface treatme..