coloring sheepskins

with respect to the coloring process, we must remember that those conditions which regulate any chemical reaction influence our coloring procedures. control of time, temperature, ph, and concentration is a must. complete solution of dyes, especially basic dyes, is also of great importance, as are process control, regulated times, controll..

hardeners offer fast cure at moderate temperatures

advanced microcapsulation technology has led to the development of a series of latent-action systems for fast, simple, effective epoxy hardening, consisting essentially of microcapsules containing an anionic curing agent dispersed in a liquid epoxy carrier. with the latent hardener systems of the new hx series, the mixing can be done well..

high pressure-temperature bioreactor: assays of thermostable hydrogenase with fiber optics

elucidating structure-function relationships for certain enzymes requires specialized equipment for studying the kinetics of enzyme-catalyzed reactions under extreme conditions. a novel bioreactor is described which is suitable for measuring enzyme activity uv-visible spectrophotometry or gas chromatography at temperatures up to 260 $degr..

applications of excimer lasers in the chemical and plastics industries

excimer lasers are very useful for ablation of material without creating thermal effects. this is because the high-energy uv light from these lasers breaks the chemical bonds in organic materials directly; and the pulsed mode of operation means that the exposure time is extremely short. the possibilities these properties open up for use i..

preparation and properties of covalently immobilized alkaline phosphatase on bombyx mori silk fibroin fiber

alkaline phosphatase, alpase (e.c.3.1.3.1) was immobilized on bombyx mori silk fibroin fiber by covalent bond formation. two different immobilization procedures (i.e. diazo and cyanogen bromide, cnbr, methods) were tried. the immobilization conditions such as ph, enzyme concentration, reaction time, and temperature were examined in detail..

use of wood flour as filler in polypropylene: studies on mechanical properties

mechanical properties of polypropylene (pp) filled with wood flour was studied. to improve adhesion at the interface, different surface treatments of the fiber were carried out. polymethylene polyphenylisocyanate (pmppic) and silane coupling agents (silane a-172, a-174, and a-1100) were used to pretreat the fiber before it was introduced ..

preparation of spray-dried, sugar-free egg powder using glucose oxidase and catalase coimmobilized on cotton cloth

glucose oxidase and catalase were coimmobilized on polyethylenimine-coated cotton cloth by adsorption followed by cross-linking with glutaraldehyde. the cloth-bound glucose oxidase-catalase could serve as an efficient and easily retrievable system for the repeated desugaring of egg melange in a batch reactor it is shown that unlike the pa..

heat-sealable pu elastomer meets life vest's stringent strength demands

this paper deals with the fabrication and tesing of a high-performance coated fabric for life vests and water-safety inflatables used on commercial aircraft and by the military. nylon fabric was selected because of its strength-to-weight characteristics, but choosing a fabric coating was more complicated the coating had to provide a varie..

effect of bromination on the oxidation resistance of pitch-based carbon fibers

bromination was found to increase the oxidation resistance of thornel p-100 pitch-based carbon fibers in the temperature range from 675 to 925 $degree$ c, whereas it decreased the oxidation resistance of p-x-7 pitch-based carbon fibers. the increased oxidation resistance may be due to bromine adsorption or the electron transfer from the g..

fibre-optic sensor with co-immobilised bacterial bioluminescence enzymes

a fiber-optic bioluminescent for the microdetermination of nadh is described. measurements can be performed in the linear range 1 $multiplied by$ 10** $minus$ **9 m $minus$ 3 $multiplied by$ 10** $minus$ **6 m with a detection limit of 3 $multiplied by$ 10** $minus$ **1**0 m using the bacterial luciferase and nad(p)h:fmn oxidoreductase co..