Showing papers in "Enzyme and Microbial Technology in 1998"

TL;DR: By cell entrapment within PVA cryogel matrices, diverse immobilized biocatalysts were prepared which were capable of performing both a simple monoenzyme biotransformation of respective substrates and a complex biosynthesis of various high- and low-molecular-weight products, decompose pollutants, and operate in biosensors.

TL;DR: Toxicity of triphenylmethane dyes is discussed with respect to different organisms and some aspects of biodegradative products of this group of dyes are also mentioned.

TL;DR: Correlations between the cellular toxicity or the extractive capacities of different solvents and some of their physical properties have been proposed in order to minimize preliminary, solvent-selection experimental work but also to help in the understanding of the molecular mechanisms of toxicity and extraction.

TL;DR: The laccase of Trametes versicolor was able to oxidize in vitro most of the 14 polycyclic aromatic hydrocarbons (PAH) tested as mentioned in this paper.

TL;DR: A review of reaction systems employed in ester production catalyzed by lipases can be found in this paper, where water has a profound effect on the lipase behavior either directly by affecting the hydration of the enzyme or indirectly by changing the nature of the reaction media and enzyme support materials.

TL;DR: Bacillus species producing a thermostable phytase was isolated from the soil of a Korean cattle shed and was very specific for phytate and had little or no activity on other phosphate esters.

TL;DR: The properties of various phytases are summarized and the digestion of phytate by phytase and its products are also discussed.

TL;DR: The present review attempts to summarize the reported data concerning the bacterial producers of CGTase, growth cultural conditions providing optimal enzyme biosynthesis in batches, repeated batch and continuous cultivation of free and immobilized cells, as well as some physicochemical and biochemical characteristics of the enzyme, C GTase immobilization, and enzyme structure.

TL;DR: By using DAAO/catalase-coimmobilized derivatives, more than 98% of phenylpyruvic acid was obtained after complete oxidation of d-phenylalanine by using the racemic mixture as substrate, which prevented enzyme from inactivation.

TL;DR: In this article, the enantioselective esterification of ibuprofen (2-(4-iso-butylphenyl)propionic acid), catalyzed by Candida antarctica lipase (type B), was performed in various organic solvents.

TL;DR: A Bacillus amyloliquefaciens strain isolated from soil produced xylanolytic enzymes in the extracellular medium when grown on xylan and nitrate and Tryptophan seems to be essential for xylanase activity.

TL;DR: Water-soluble peptides from Mozzarella, Italico, Crescenza, and Gorgonzola cheeses were fractionated by reverse-phase fast protein liquid chromatography as discussed by the authors.

TL;DR: Horseradish peroxidase has been proven effective in removing phenolic compounds in wastewater and additives such as polyethylene glycol have been found very effective in reducing the minimum enzyme dose required.

TL;DR: The kinetic model of lactose hydrolysis by means of a commercial β-galactosidase from Kluyveromices fragilis provided by Novo nordisk has been determined using a wide range of the main variables: enzyme, substrate, and product concentrations and temperature.

TL;DR: Production of a lipopeptide surfactant, surfactin, by Bacillus subtilis ATCC 21332 was highly enhanced when iron concentration in the medium was raised from 4 μ m to the few m m level, which resulted in increased biomass concentration.

TL;DR: All the polymers synthesized were found to be quite homogeneous and their average molecular weight is of the same order of magnitude as the ones commercially available.

TL;DR: In this article, the adsorption of a purified 20.7 kDa thermostable endo-1-4-β-xylanase (EC 3.1.8) from a Bacillus sp. on wheat straw at 4°C was studied.

TL;DR: Mixed fungal cultures have been isolated from acidic gasworks soil by their ability to utilize iron or nickel cyanide as the sole source of nitrogen at acidic or neutral pH, respectively, and growth was associated with progressive removal of cyanide from the culture supernatant.

TL;DR: The nitrogen demand of industrial yeast strains were compared and substantial differences were found between strains, regardless of the initial medium composition and added nitrogen source.

TL;DR: The oxygen transfer coefficient increases with the agitation rate and the oxygen consumption rate increased almost linearly with the biomass concentration; however, substrate consumption was highest at HOT conditions.

TL;DR: The existence of at least two different alpha-galactosidases in Aspergillus niger was confirmed, with one of them showing synergism with beta-mannanase and the other with a different mass after deglycosylation with N-glycanase F.

TL;DR: Fedbatch culture proved to be a better fermentation system for the production of lactic acid than batch culture.

TL;DR: Ice-nucleation protein (INP), an outer membrane protein from Pseudomonas syringae, is able to catalyze the ice crystal formation of supercooled water and could also direct CMCase on the cell surface, suggesting that it has the secretion and targeting signal to the outer membrane.

TL;DR: The deproteinization activity was better than that of the proteolytic bacterium Pseudomonas maltophilia reported in many previous studies and ranged in the order of higher protein removal efficiency.

TL;DR: The decarboxylase was inactive toward both o - and m -coumaric acid and toward cinnamic acid, indicating that the para -hydroxy group is essential for activity.

TL;DR: In this paper, the delignification of chemical pulps with laccase and n -hydroxybenzotriazole was explored employing a pre-and post-O 2 delignified softwood draft pulp.

TL;DR: In this paper, the performance of Bacillus subtilis strain 11089 was studied in terms of their chemical compositions and their ability to support the growth and extracellular hydrolytic enzyme production.

TL;DR: Comparative and standardized treatments of pulp with the commercial bleach-boosting enzyme preparations Cartazyme and Pulpzyme demonstrated that the crude S. thermoviolaceus xylanase preparation was at least as effective in enhancing brightness with concomitant preservation of paper strength properties.

TL;DR: A Bacillus licheniformis mutant derived by random mutagenesis with n -methyl- n ′-nitro- n -nitrosoguanidine treatment producing high levels of the lipopeptide biosurfactants was selected by an ion-pair plate assay.

TL;DR: Glucoamylase was covalently immobilized onto pHEMA/EGDMA microspheres of two different sizes: 50–100 μm and 100–200 μm in diameter, indicating decreased affinity by the enzume for its substrate.