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  • 1
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 49 (1984), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: As determined by high performance liquid chromatography, (-)- epicatechin concentrations among freshly harvested beans of verified genetic origin ranged from 21.89–43.27 mg/g of dry defatted samples. Fermented beans showed much lower concentrations (2–10 mg). During fermentation, a trend towards decrease in (-)-epicatechin content was observed. Commercial beans from areas with reputations for shipping well-fermented products contained lower levels of (-)-epicatechin than beans from regions where fermentation is less extensive.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 48 (1983), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A sensitive high performance liquid chromatographic method for analysis of (-)epicatechin (3,3′,4′,5,7-pentahydroxyflavan) in cocoa beans is described. Bean samples were extracted in 80% acetone with subsequent sample clean-up on a Waters Associates C18 SEPPAK. Separation of (-)-epicatechin was accomplished on a μBondapak C18 column using a mobile phase of water:methanol:acetic acid (87:8:5). (-)-Epicatechin was detected at 280 nm and quantified by comparing peak height of sample to those of standards. The method demonstrated excellent reproducibility and recoveries of added (-)epicatechin averaged over 90%. UV scans and mass spectrometric anlaysis of collected eluate from the chromatograph provided positive identification of the compound in cocoa bean extracts.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 49 (1984), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Myosin cross-linking in freeze-dried meat has been investigated. Extraction of proteins and electrophoretic separation of the extracted proteins were used to monitor the cross-linking in freeze-dried meat. The extractability of proteins decreases upon heating and the loss of solubility of myosin is evident. Treating the freeze- dried meat with N-α-acetyl-L-lysine or L-lysine·HCl prevents this loss. The decrease in extractability of myosin is accompanied by the development of brown color. The cross-linking is attributed to a Maillard-type reaction and is suggested to be responsible for textural changes in freeze-dried meat. Treating the meat with hydrolyzed vegetable protein is proposed as a practical method of preventing such cross-linking in freeze-dried meat.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 28 (1982), S. 833-835 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The partial enthalpy of dissolved hydrogen in hydrocarbon liquids is derived from the fugacity correlation of Sebastian et al. and the results are presented in general equations. The partial enthalpy of the hydrocarbon solvent is found to be changed only insignificantly by the dissolved hydrogen from that of the pure liquid at the experimental conditions of up to 30 MPa in pressure.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1435-1536
    Keywords: Polyelectrolyte ; bentonite ; flocculation ; adsorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Abstract The interactions between tert-ammonium type cationic polyelectrolyte, the polycondensate of ethanolamine and epichlorohydrine (PEE), and bentonite particules in dilute aqueous suspensions are studied in the light of adsorption and flocculation. The extents of both phenomena are significantly influenced by the ionic strength of the medium. The adsorption of PEE on the bentonite particles occurs initially at the sites occupied by the hydrogen ions as counterion and then at the sites previously occupied by calcium ions. As flocculation mechanisms, charge neutralization appears to be principal one whereas polymer bridging effect becomes important only when the ionic strength is significant.
    Notes: Résumé Les intéractions entre un polyélectrolyte cationique de type ammonium tertiaire PEE(polycondensat d'éthanolamine et d'épichlorhydrine) et une suspension aqueuse de bentonite ont été étudiées sous l'angle des phénomènes d'adsorption et de floculation. L'importance de ces deux phénomènes est fortement influencée par la force ionique du milieu. L'adsorption du PEE sur les particules de bentonite se situe d'abord sur les sites occupés par les ions hydrogène comme les ions opposés et ensuite sur les sites occupés par les ions calcium. La neutralisation de charge semble être le principal mécanisme de floculation tandis que l'effet du pontage interparticulaire du polyélectrolyte ne devient notable que pour des forces ioniques du milieu importantes.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 24 (1982), S. 1889-1896 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 24 (1982), S. 2167-2174 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: For the purpose of saving the energy and raw materials required in glutamate fermentation, an immobilized whole-cell system was prepared and its performance in a continuous reactor system was evaluated. Corynebacterium glutamicum (a mutant strain of ATCC 13058) whole cell was immobilized in K-carrageenan matrix and the gel structure was strengthened by treatment with a hardening agent. The effective diffusivities of carrageenan gel for glucose and oxygen were found to decrease significantly with an increase in carrageenan concentration, while the gel strength showed an increasing trend. Based on the physical and chemical properties of carrageenan gel, the immobilization method was improved and the operation of the continuous reactor system was partially optimized. In an air-stirred fermentor, the continuous production of glutamate was carried out. The effect of the dilution rate on glutamate production and operational stability were investigated. The performance of the continuous whole-cell reactor system was evaluated by measuring glutamate productivity for a period of 30 days; it was found to be far superior to the performance of conventional batch reactor systems using free cells.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 121 (1984), S. 284-290 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Influx of the K+ analogue Rb+ was measured through the ouabain-sensitive Na+/K+ pump and the ouabain-insensitive “leak” pathways in Cl- or NO-3 in mature red cells from adult pigs and in reticulocytes naturally occurring in 7-day-old piglets. In reticulocytes, Rb+ influxes by the two pathways were of about equal magnitude in Cl- (13 and 10 mmoles/liter cells × hr) and at least 25-fold larger than in mature red cells (0.5 and 0.4 mmoles/liter cells × hr). In Na + media, a portion of the ouabain-insensitive “leak” flux of Rb+ was Cl- dependent (Rb+Cl- transport) as NO-3 replacement reduced Rb+ influx by 90% in reticulocytes and by 40% in mature red cells. The sulfhydryl reagent N-ethylmaleimide (NEM) stimulated Rb+Cl- transport about twofold in reticulocytes and up to 13-fold in mature red cells. When reticulocytes matured to erythrocytes during in vitro incubation, about 90% of both ouabain-sensitive Rb+ pump and ouabain-insensitive Rb+Cl- influx were lost. In contrast, the NEM-stimulated Rb+Cl- transport changed much less throughout this period, suggesting an entity operationally but not necessarily structrually distinct from the basal Rb+Cl- transport. Although the experimental variability precluded a full assessment of significant changes in the small Na+/K+(Rb+) pump and Rb+Cl- fluxes in mature pig red cells kept for the same time period in vitro, Rb+ flux changes in reticulocytes appear to be maturational in nature, reflecting parallel activity transitions of Na+/K+ pump and Cl--dependent K+ fluxes in vivo.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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