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  • Articles  (5)
  • Polymer and Materials Science  (3)
  • Models, Molecular  (2)
  • Geophysics
  • METEOROLOGY AND CLIMATOLOGY
  • ddc:330
  • 1995-1999  (5)
  • 1975-1979
  • 1996  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Letter to the Editor (1996)
    New York : Wiley-Blackwell
    Biopolymers 38 (1996), S. 437-438 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360380402
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Hysteresis in the glucose permeability versus pH characteristic for a responsive hydrogel membrane (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 17 (1996), S. 409-415 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A side-by-side diffusion cell was used to study the permeability of glucose through a temperature- and pH-sensitive poly(N-isopropylacrylamide-co-methacrylic acid) hydrogel membrane. At fixed temperature (37°C), lowering pH in one side of the cell induced hydrogel volume collapse and strongly attenuated glucose permeation across the membrane. Hysteresis was observed in the glucose permeability versus pH characteristic.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1996.030170607
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  • 3
    Electronic Resource
    Electronic Resource
    Syndiotactic polystyrene preparation in a rim process (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 62 (1996), S. 1807-1818 
    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: Very few polymeric systems are suitable for preparing engineering parts using reaction injection molding (RIM) processing. A new two-component metallocene catalyst, which is able to polymerize bulk styrene at high rates to the syndiotactic form, was studied. The catalyst used in this work was based on monocyclopentadienyl analogs of titanium (Cp*TiMe3), which was used in conjunction with a boron cocatalyst [B(C6F5)3]. When separate streams of the catalyst and cocatalyst, dissolved in either styrone or styrene/toluene solutions, met in a mixhead, the styrene polymerized rapidly to form crystalline, syndiotactic polystyrene (s-PS). Using a bench scale RIM device, the monomer conversion during polymerization was monitored through the quasi-adiabatic temperature rise, recorded by a rapid data acquisition system. The rate equation was found to be second order with respect to the monomer concentration and first order with respect to the catalyst concentration, given some assumptions. The s-PS was brittle and attempts were made to incorporate elastomer toughening into the reacting system. Several potential problems associated with using this system for RIM process discussed. © 1996 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 4
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    A mechanism of drug action revealed by structural studies of enoyl reductase (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-12-20
    Description: Enoyl reductase (ENR), an enzyme involved in fatty acid biosynthesis, is the target for antibacterial diazaborines and the front-line antituberculosis drug isoniazid. Analysis of the structures of complexes of Escherichia coli ENR with nicotinamide adenine dinucleotide and either thienodiazaborine or benzodiazaborine revealed the formation of a covalent bond between the 2' hydroxyl of the nicotinamide ribose and a boron atom in the drugs to generate a tight, noncovalently bound bisubstrate analog. This analysis has implications for the structure-based design of inhibitors of ENR, and similarities to other oxidoreductases suggest that mimicking this molecular linkage may have generic applications in other areas of medicinal chemistry.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baldock, C -- Rafferty, J B -- Sedelnikova, S E -- Baker, P J -- Stuitje, A R -- Slabas, A R -- Hawkes, T R -- Rice, D W -- New York, N.Y. -- Science. 1996 Dec 20;274(5295):2107-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Krebs Institute for Biomolecular Research, Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, UK. D.Rice@sheffield.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8953047" target="_blank"〉PubMed〈/a〉
    Keywords: Anti-Bacterial Agents/*metabolism/pharmacology ; Binding Sites ; Boron Compounds/*metabolism/pharmacology ; Crystallography, X-Ray ; Drug Design ; Drug Resistance, Microbial ; Enoyl-(Acyl-Carrier-Protein) Reductase (NADH) ; Enzyme Inhibitors/*metabolism/pharmacology ; Escherichia coli/enzymology ; Escherichia coli Proteins ; Fatty Acid Synthase, Type II ; Fatty Acid Synthases/antagonists & inhibitors/*chemistry/metabolism ; Hydrogen Bonding ; Models, Molecular ; NAD/*metabolism ; Oxidoreductases/antagonists & inhibitors/*chemistry/metabolism ; Protein Conformation ; Protein Structure, Secondary
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
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    Crystal structure of DNA recombination protein RuvA and a model for its binding to the Holliday junction (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-10-18
    Description: The Escherichia coli DNA binding protein RuvA acts in concert with the helicase RuvB to drive branch migration of Holliday intermediates during recombination and DNA repair. The atomic structure of RuvA was determined at a resolution of 1.9 angstroms. Four monomers of RuvA are related by fourfold symmetry in a manner reminiscent of a four-petaled flower. The four DNA duplex arms of a Holliday junction can be modeled in a square planar configuration and docked into grooves on the concave surface of the protein around a central pin that may facilitate strand separation during the migration reaction. The model presented reveals how a RuvAB-junction complex may also accommodate the resolvase RuvC.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rafferty, J B -- Sedelnikova, S E -- Hargreaves, D -- Artymiuk, P J -- Baker, P J -- Sharples, G J -- Mahdi, A A -- Lloyd, R G -- Rice, D W -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 1996 Oct 18;274(5286):415-21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Krebs Institute, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2TN, UK. d.rice@sheffield.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8832889" target="_blank"〉PubMed〈/a〉
    Keywords: Bacterial Proteins/*chemistry/metabolism ; Base Composition ; Crystallography, X-Ray ; DNA Helicases/metabolism ; DNA, Bacterial/chemistry/*metabolism ; DNA-Binding Proteins/*chemistry/metabolism ; Endodeoxyribonucleases/metabolism ; Escherichia coli ; *Escherichia coli Proteins ; Hydrogen Bonding ; Models, Molecular ; *Nucleic Acid Conformation ; Oligodeoxyribonucleotides/chemistry/metabolism ; *Protein Conformation ; Protein Structure, Secondary ; Protein Structure, Tertiary ; *Recombination, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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