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  • Electronic Resource  (8)
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  • Electronic Resource  (8)
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  • 1
    Electronic Resource
    Electronic Resource
    Reduction of limonin bitterness in navel orange juice serum with bacterial cells immobilized in acrylamide gel (1982)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 30 (1982), S. 509-511 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf00111a024
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Preliminary X-ray analysis of a new crystal form of the Escherichia coli KDO8P synthase (2000)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 516-519 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: 3-Deoxy-D-manno-octulosonate 8-phosphate (KDO8P) synthase catalyzes the biosynthesis of an essential component of the lipopolysaccharide of all Gram-negative bacteria. The structure and mechanism of KDO8P synthase are being actively studied as this enzyme represents an important target for antibiotic therapy. The structure of the Escherichia coli KDO8P synthase in cubic crystals (space group I23) has recently been determined and the enzyme shown to be a tetramer of identical subunits. However, this information is challenged by biochemical studies, which suggest that the enzyme behaves in solution as a homotrimer. Here, the preparation and preliminary X-ray analysis of monoclinic crystals of KDO8P synthase are reported. The crystals belong to space group P21, with unit-cell parameters a ∼ 50, b ∼ 140, c ∼ 74 Å, β ∼ 105°. The structure of KDO8P synthase in the monoclinic crystal form was determined by molecular replacement, using as a search model one of the subunits of the enzyme in the cubic crystals. A tetramer of KDO8P synthase with 222 local symmetry is also present in the asymmetric unit of the P21 crystals, with a solvent content of 43%. The observation that the same quaternary structure of KDO8P synthase is observed in two different crystal forms belonging to distinct crystal systems (monoclinic and cubic) suggests that a tetramer is the native form of the enzyme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444900002389
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of some polyurethanes (1988)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 156 (1988), S. 29-35 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Polymere mit Urethaneinheiten wurden durch Lösungspolymerisation der Bisphenole A, C und F mit Diisocyanaten wie Toluol-2,4-diisocyanat, Hexamethylendiisocyanat, Isophorondiisocyanat bzw. Diphenylmethandiisocyanat hergestellt. Die erhaltenen Polymeren waren blaßgelbe Pulver. Diese Polymeren wurden durch IR-Spektroskopie und Bestimmung des Stickstoffgehalts charakterisiert. Die zahlenmittleren Molekulargewichte (M̄n) wurden durch Leitfähigkeitstitration und Bestimmung der Grenzviskositätszahl in Dimethylformamid ermittelt. Mittels Thermogravimetrie wurde das thermische Verhalten untersucht. Die kinetischen Parameter des Abbaus wurden berechnet.
    Notes: Polymers containing urethane units were synthesized by solution polymerization of bisphenols A, C, and F with diisocyanates viz. toluene-2,4-diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and diphenylmethane diisocyanate, respectively. Thus obtained polymers were pale yellow amorphous powders. These polymers were characterized by infrared spectral studies and nitrogen content. The number-average molecular weights (M̄n) were estimated from conductometric titration and limiting viscosity number [η] in dimethyl formamide. From thermogravimetric analyses, the thermal behaviour was studied. Kinetic parameters for their degradation were computed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1988.051560103
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  • 4
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer networks based on castor oil, 1Dedicated with a profound sense of admiration and gratitude to the memory of late Prof. Dr. Werner Kern (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 525-531 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Liquid prepolyesters (PPE) were obtained from castor oil and dibasic acids, viz. oxalic, malonic, succinic, glutaric, adipic, suberic and sebacic acids. All these prepolyesters were subsequently copolymerized with acrylamide by radical polymerization initiated with benzoyl peroxide. The resulting prepolyester (PPE)/polyacrylamide (PAm) interpenetrating polymer networks (IPN's) were characterized by elemental analyses, solubility behaviour, IR spectral study, differential scanning calorimetry and thermogravimetry. The transition behaviour was analyses for one IPN by the Ozawa and the Kissinger methods for calculating the various kinetic parameters.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870305
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  • 5
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer networks from castor oil-based polyurethanes and poly(methyl methacrylate). V (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 25 (1987), S. 2251-2260 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Castor oil is reacted with hexamethylene diisocyanate under different experimental conditions varying the NCO/OH ratio to yield liquid prepolyurethanes (PPU's). All these polyurethanes were interpenetrated with methyl methacrylate (MMA) and a crosslinker EGDM by radical polymerization initiated by benzoyl peroxide. The novel PPU/MMA interpenetrating polymer networks (IPN's) were obtained as tough films by transfer molding. The characterization of these IPN's includes resistance to chemical reagents, thermal behavior (DSC, TGA), and the mechanical properties, namely, tensile strength, modulus of elasticity, elongation at break (%), and hardness. The morphological behavior (SEM) and dielectrical properties such as electrical conductivity, dielectric constant (ε′), dielectric loss (ε″), and loss tangent (tan δ) were estimated.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1987.080250821
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  • 6
    Electronic Resource
    Electronic Resource
    Glass-reinforced interacting blends of epoxy/polyurethane based on castor oil: Synthesis and characterization. II (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 33 (1987), S. 67-75 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Mechanical and dielectric properties of rubber mixtures of epoxy/polyurethane based on castor oil loaded with glass fiber is of great interest from a technological point of view. Epoxy resin was prepared from bisphenol A and epichlorohydrin in alkaline medium. Polyurethane was prepared from the hydroxyl group of castor oil reacted with 2,4-toluene diisocyanate. Elemental analysis and infrared (IR) spectra are presented as evidence for the formation of these materials. A homogeneous solution of epoxy resin and polyurethane was prepared in acetone containing a curing agent 1,3-propane diamine. The glass-reinforced laminates were prepared by interacting polymer blends on the glass fiber through compression moulding. Chemical resistance to solvents, flexural strength, izod impact strength, and Rockwell hardness studies on a series of specimens were investigated. It was observed that they behave as tough materials. An attempt was made to study the effect of electrical conductivity by changing the compositions of rubber mixtures during reinforcement with glass fibers. The dielectric constant (E′) dielectric loss (E″), and loss tangent (tan δ) of the specimens and their dependence of temperature was studied.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1987.070330106
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  • 7
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer networks from caster oil-based-polyurethanes and poly(ethyl acrylate). VII (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 34 (1987), S. 2037-2045 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Liquid prepolyurethanes were synthesized from castor oil and toluene-2, 4-diisocyanate (TDI) under different experimental conditions and varying NCO/OH ratios. All these prepolyurethanes were subsequently reacted with ethyl acrylate/ethylene glycol dimethacrylate mixtures by radical polymerization using benzoyl peroxide as initiator to obtain interpenetrating polymer networks (IPNs) by transfer molding. The novel polyurethane/poly(ethyl acrylate) IPNs are found to be tough films. These IPNs are characterized in terms of their resistance to chemical reagents, thermal behavior (DSC, TGA), mechanical behavior including tensile strength, Young's modulus, and elongation. The dielectric properties, namely electrical conductivity (σ), dielectric constant (ε′), dielectric loss (ε″), and loss tangent (tan δ) were computed. The mechanothermal behavior was analyzed by dynamic mechanical spectroscopy. The morphological behavior was studied by scanning electron microscopy.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1987.070340520
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  • 8
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer networks from castor oil based polyurethane and poly(methyl methacrylate), IIIPart II cf. lit.6. (1987)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 149 (1987), S. 111-117 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Flüssige Präpolyurethane wurden aus Rhizinusöl und Toluylen-2,4-diisocyanat bei unterschiedlichen experimentellen Bedingungen unter Variation des NCO/OH Verhältnisses hergestellt. Alle diese Präpolyurethane wurden nachträglich mit Polymethylmethacrylat interpenetriert, das durch radikalische Polymerisation mit Benzoylperoxid als Initiator erhalten wurde. Die neuen PPU/PMMA interpenetrierenden Netzwerke wurden als zäher Filme durch Gießen erhalten. Sie wurden durch thermische Untersuchungen (DSC und TGA) und mechanische Eigenschaften wie Zugfestigkeit, Elastizitätsmodul und prozentuale Bruchdehnung charakterisiert. Das morphologische Verhalten wurde mit Hilfe der Rasterelektronenmikroskopie analysiert.
    Notes: Liquid prepolyurethanes (PPU) were obtained from castor oil and toluene-2,4-diisocyanate under different experimental conditions varying NCO/OH ratio. All these prepolyurethanes were subsequently interpenetrating with poly(methyl methacrylate) made by radical polymerization initiated with benzoyl peroxide. The novel PPU/PMMA interpenetrating polymer networks were obtained as though films by transfer moulding. They were characterized by thermal studies (DSC and TGA) and mechanical properties viz., tensile strength, modulus of elasticity, and percent elongation at break. The morphological behaviour was analyzed by scanning electron microscopy.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1987.051490108
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