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  • General Chemistry  (4)
  • Polymer and Materials Science  (2)
  • 1995-1999  (2)
  • 1990-1994  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 42 (1997), S. 411-414 
    ISSN: 0006-3525
    Keywords: enzyme structure ; protein topology ; iron-sulfur cluster ; topological chirality ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An examination of x-ray structures of single-cluster [4Fe-4S] proteins in the Protein Data Bank has revealed that all redox proteins and the glutamine 5-phosphoribosyl-1-pyrophosphate amidotransferase from Bacillus subtilis have a topological configuration arbitrarily designated as D, whereas the DNA repair enzyme endonuclease III from Escherichia coli has the opposite topological configuration, L. This is the first example in which both senses of topological chirality have been observed in a class of proteins. © 1997 John Wiley & Sons, Inc. Biopoly 42: 411-414, 1997
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 35 (1995), S. 343-345 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 104 (1992), S. 1290-1291 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 104 (1992), S. 1012-1031 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Seit Pasteurs epochemachenden Entdeckungen vor eineinhalb Jahrhunderten spielt das Konzept der Chiralität eine zentrale Rolle in der Chemie und der Biochemie. Kann Chiralität gemessen werden? Es ist seit langem bekannt, daß der molekularen Chiralität eine quantitative Bedeutung durch Funktionen gegeben werden kann, die speziell parametrisiert werden, um den Werten pseudoskalarer Meßgrößen zu entsprechen. Doch die Chiralität ist eine Eigenschaft, die unabhängig von ihren physikalischen und chemischen Erscheinungen ist: Alles, was erforderlich ist, damit ein System chiral ist, ist das Fehlen von Drehspiegelachsen in der Symmetriegruppe des Systems. Angenommen, diese Bedingung ist erfüllt, wie kann dann die Chiralität gemessen werden, wenn das System eine abstrakte geometrische Form ist, z.B. ein ungleichseitiges Dreieck in der Ebene oder ein asymmetrisches Tetraeder im dreidimensionalen Raum? Wie ändert sich die Chiralität als Funktion nur der Form? In dieser übersicht beschreiben wir neueste Bemühungen, diese und damit zusammenhängende Fragen zu beantworten.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 31 (1992), S. 989-1007 
    ISSN: 0570-0833
    Keywords: Chirality ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Since Pasteur's epochal discoveries a century and a half ago, the concept of chirality has continued to play a central role in chemistry and biochemistry. Can chirality be measured? It has long been known that molecular chirality can be given a quantitative meaning through functions specifically parametrized to match the magnitude of pseudoscalar observables. However, chirality is a property that is independent of its physical and chemical manifestations : for a system to be chiral, all that is required is the absence of improper rotations in the symmetry group of the system. This being the case, how can chirality be measured if the “system” is an abstract geometric figure, for example, a scalene triangle in the plane or an asymmetric tetrahedron in three-dimensional space? How does chirality vary as a function of pure shape? In this review we describe recent efforts designed to answer these and related questions.
    Additional Material: 13 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 31 (1992), S. 800-801 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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