Archive for the ‘for26cat’ Category
Saturday, June 28th, 2008
Formation of oligosaccharides during enzymatic lactose: Part I: State of art.
Enzymatic lactose hydrolysis by beta-galactosidase (lactase) was investigated with respect to the formation of oligosaccharides. An analysis of the formation of oligosaccharides and their control is important in the development of technical applications for enzymatic ...
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Saturday, June 28th, 2008
Operating parameters\' effects on the outcome of pure and simple competition between two populations in configurations of two interconnected chemostats.
It is known from the literature that two microbial populations competing purely and simply for a common substrate in a spatially inhomogeneous environment may under certain ...
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Saturday, June 28th, 2008
An enzyme electrode for on-line determination of ethanol and methanol.
Since a stable alcohol oxidase with a high specific activity is not commercially available, we propose to produce and purify this enzyme from a strain of the yeast Hansenula polymorpha. This alcohol oxidase was immobilized into ...
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Saturday, June 28th, 2008
Potential enhancement of photosynthetic energy conversion in algal mass culture.
Actual laboratory data obtained from steady-state Dunaliella tertiolecta cultures grown under a wide range of photon flux densities were used in a simple model to calculate daily production in a conventional algal mass culture system. In ...
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Saturday, June 28th, 2008
Evaluation of half-life of immobilized enzyme during continuous reaction in bioreactors: A theoretical study.
A theoretical study has been carried out on the evaluation of the apparent half-life of immobilized enzyme activity during continuous reaction both in a plug-flow reactor (PFR) and in a continuous-flow stirred-tank ...
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Saturday, June 28th, 2008
Microencapsulation of human fibroblasts in a water-insoluble polyacrylate.
Viable human diploid fibroblasts have been micro-encapsulated in EUDRAGIT RL, a commercially available water-insoluble polyacrylate, by an interfacial precipitation technique. Cells in medium and polymer solution (in diethyl phthalate) were coextruded and formed into droplets by a coaxial ...
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Saturday, June 28th, 2008
Economic assessment of plant cell culture for the production of ajmalicine.
Cost estimates have been prepared for commercial-scale production of ajmalicine-rich Catnaranthus roseus biomass using plant cell culture. At the current state of the technology the cost would be approximately $7.30/lb dry biomass ($3215/kg ajmalicine). Naturally-grown ...
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Saturday, June 28th, 2008
A novel technique for measuring solute diffusivities in entrapment matrices used in immobilization.
A novel technique has been developed for measuring effective solute diffusivities in entrapment matrices used for cell immobilization. In this technique radiotracers were used to measure effective diffusivities and equilibrium partition coefficients of ...
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Saturday, June 28th, 2008
Theoretical and experimental studies on the influence of ultrasound on immobilized enzymes.
Experimental investigations on alpha-amylase and glucoamylase bound to porous polystyrene show that the activity of immobilized enzymes can be raised in the presence of an ultrasonic field. The maximum activity increase in a flow ...
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Saturday, June 28th, 2008
Oxidation of an inhibitory substrate by washed cells (oxidation of phenol by Pseudomonas putida).
The specific uptake rate of phenol by washed cells of Pseudomonas putida grown on phenol in steady-state continuous culture at various dilution rates was studied. The Monod-Haldane-type equation was applied to fit ...
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Saturday, June 28th, 2008
Anaerobic digestion of wood ethanol stillage using upflow anaerobic sludge blanket reactor.
The anaerobic digestion of wood ethanol stillage in a UASB reactor was studied. At organic loading rates be low 16 kg COD/m(3) day the reactor performed effectively, achieving soluble COD and BOD removals in ...
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Saturday, June 28th, 2008
Separation of dilute aqueous butanol and acetone solutions by pervaporation through liquid membranes.
A simultaneous extraction-stripping process is proposed for separating volatile products from fermentation broths, it is based on pervaporation through a liquid membrane supported with a hydrophobic porous membrane. The liquid membrane prepared with ...
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Saturday, June 28th, 2008
Influence of anions on metal adsorption by Rhizopus arrhizus biomass.
The presence of anions in solution was found to inhibit the uptake of La(3+), Cd(2+), Pb(2+), UO(2+) (2), and Ag(+) by Rhizopus arrhizus biomass. The effects ranged from total inhibition of Cd(2+) and Pb(2+) uptake at ...
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Saturday, June 28th, 2008
Enzymatic synthesis of L-cysteine.
O-Acetylserine sulfhydrase in the form of a crude extract from Salmonella typhimurium LT2 was used for the production of L-cysteine from L-O-acetylserine and sodium hydrosulfide at pH 7.0 and 25 degrees C. The two substrates have quite different pH stability relationships. O-Acetylserine ...
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Saturday, June 28th, 2008
Effect of culture phasing and a polysaccharide on production of xylanase by mixed culture of trichoderma reesei D1-6 and aspergillus wentii Pt 2804.
A significant increase in extracellular xylanase activity was observed in the mixed culture fermentation of Trichoderma reesei D1-6 and Aspergillus wentii Pt 2804 ...
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Saturday, June 28th, 2008
Preservation of potential fermentables in sweet sorghum by ensiling.
Pressed and wilted samples of sweet sorghum [Sorghum bicolor (L.) Moench var. Rio] were ensiled for periods up to 155 days. A kinetic study of the biochemical changes which occurred during ensiling showed that in wilted sorghum ...
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Saturday, June 28th, 2008
Harvesting of Scenedesmus obliquus in wastewaters: Auto- or bioflocculation?
Autoflocculation and bioflocculation are considered to be the most promising means for the economical harvesting of microalgae. We have therefore studied these phenomena with cultures of Scenedesmus obliquus produced during biological tertiary wastewater treatment. The quantity of ...
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Saturday, June 28th, 2008
A dynamic simulation of a two-phase anaerobic digestion system for solid wastes.
In this article, a two-phase system for the digestion of wastes with a high solid content is simulated. The solids are charged to the hydrolyzer and then leachate recirculation is activated until biodegradation is ...
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Saturday, June 28th, 2008
Mathematical modelization of a packed-bed reactor performance with immobilized yeast for ethanol fermentation.
The performance of a continuous vertical packed-bed reactor with yeast immobilized in carrageenan gel beads is reported. The study focuses on the mathematical modelling of the steady-state fermentor behavior by means of a ...
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Saturday, June 28th, 2008
Periodic forcing of microbial cultures: A model for induction synchrony.
Periodic environmental shifts have been used to induce synchrony in many different microbial populations. In this article, the induction synchrony phenomenon is analyzed using an age distribution model in which the age at which the cells ...
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Saturday, June 28th, 2008
Substrate protection of immobilized glucose isomerase.
Using commercial immobilized glucose isomerase (SWETASE(R), Nagase Co.), the effect of substrate protection on enzyme deactivation has been studied in a batch manner. The data analysis was carried out based on Briggs-Haldane kinetics in which enzyme deactivation accompanying the protection ...
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Saturday, June 28th, 2008
Affinity liquid-liquid extraction of lactate dehydrogenase on a large scale.
Rapid liquid-liquid extraction of lactate dehydrogenase from muscle by using a low-cost aqueous bipolymer two-phase system was achieved by using a centrifugal separator. Extraction of the target enzyme into the upper phase was enhanced by including ...
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Saturday, June 28th, 2008
Dichloroacetate stabilizes the intraoperative acid-base balance during liver transplantation.
Lactic acidosis occurs during orthotopic liver transplantation (OLT), especially during the anhepatic and early postreperfusion phases. Dichloroacetate (DCA) inhibits pyruvate dehydrogenase kinase-1, indirectly activating mitochondrial pyruvate dehydrogenase. This, in turn, markedly reduces systemic lactate production and, to ...
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Saturday, June 28th, 2008
Transjugular liver biopsy in patients with living donor liver transplantation: Comparison with percutaneous biopsy.
Transjugular liver biopsy (TJLB) is an alternative method of pathological diagnosis in patients with an established contraindication to percutaneous biopsy. Between November 2005 and July 2007, 111 TJLBs were attempted in 67 ...
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Saturday, June 28th, 2008
Identifying risk for recurrent hepatocellular carcinoma after liver transplantation: Implications for surveillance studies and new adjuvant therapies.
The recurrence of hepatocellular carcinoma (HCC) is a major cause of mortality for patients transplanted with HCC. There currently exists no standard method for identifying those patients with a ...
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