use of a single-fiber reactor for the enzymatic removal of amino acids from solutions

in this article we describe the use of bench-scale single-fiber dialyzers for the development and testing of an immobilized enzyme reactor for the treatment of leukemia. the treatment is based on the enzymatic removal of specific amino acids from the blood of leukemia patients. l-lysine $alpha$ -oxidase and catalase were coimmobilized wit..

measuring unevenness and blend ratio of yarns with microwave resonators

to explore new methods for testing the irregularity of yarns and the blend ratio of blended yarns, a microwave technique was chosen to investigate the role of polymer fibers in microwave resonating fields. this method determines the ratio of yarns in a blended sample by ascertaining their longitudinal dielectric properties using a special..

variation of water vapor resistance of microporous and hydrophilic films with relative humidity

a method is described for measuring the water vapor resistance of textiles under variable conditions of relative humidity (rh). it consists basically of varying the position of the sample in an air gap between a wet and a dry surface while keeping all other conditions constant. the resistance is determined by the rate of water loss from t..

bioseparations, especially by hollow fibers

downstream processing in biotechnology is best idealized as a four step process: removal of insolubles, isolation, purification, and polishing. the first and last steps are relatively easily achieved; the isolation and purification steps include most of the potential problems. while purification has often been presumed the most difficult,..

modification of gel-drawn poly(vinyl alcohol) fibers with formaldehyde

poly(vinyl alcohol) fibers which were drawn from dried gels were chemically treated with formaldehyde to induce crosslinking in the amorphous phase. the room temperature storage modulus decreased early in the treatment, to an almost constant value of 50-60 of the initial modulus of the fiber. this behavior was independent of the concentra..

transducer mechanisms for optical biosensors. part 1. the chemistry of transduction

the first stage of optical biosensor transduction involves a chemical interaction between the analyte and an indicator phase to produce an optically detectable signal. this stage is critical because it determines stability, selectivity and sensitivity as well as establishing the wavelengths required for the optical measurement several typ..

biochemical clean-up of wastewater containing n-methylpyrrolidone

the possibility of biochemical oxidation of n-methylpyrrolidone (an organic solvent) at comparatively high starting concentrations was studied. the studies were done in a pilot aeration tank operating under a contact regime, with sludge adapted for two weeks. the progress of the biodegradation was evaluated from measurements of the bod an..

effect of thiosulfate and of sulfide on biochemical oxidation of surface-active substances

the process of biological clean-up of viscose fiber wastewater was studied to determine the effect of thiosulfate and sulfide on the biodegradation of surface active substances (sas). the studies were carried out in laboratory aeration tanks operating under a contact regime by one- and two-stage schemes, using model viscose manufacture wa..

cleaning up wastewater from viscose fibre manufacture by isolating local streams

methods of cleaning wastewater from viscose fiber manufacture, and specifically, removal of thiosulfate, are discussed. potential methods include decomposition by sulfur dioxide, oxidation by oxygen or ozone, and biochemical oxidation. thiosulfate removal by the latter two methods was studied experimentally. removing thiosulfate by oxidat..

fiber optic sensors to measure beats and linear dimensions in gap

an investigation is presented of the use of fiber optic converters (foc) with external modulation of the light flux intensity, for active control of the beats of rotating articles during lathe treatment. also investigated was the use of foc parameters to control the surface treatment and linear dimensions the experiments with turning of c..