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  • 1970-1974  (3)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 3 (1971), S. 421-427 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé Détermination par analyse enthalpique différentielle de la chaleur de fusion de l'uridine cristallisée et de son dérivé phosphaté, l'uridine-3′(2′) phosphate, ainsi que de l'enthalpie et de l'entropie de polymérisation de leur mélange. A l'aide d'un calculateur analogique, analyse du phénomène exothermique associé au chauffage du mélange et mise en évidence d'au moins 5 processus expliqués en se servant de données expérimentales déjà publiées.
    Abstract: Zusammenfassung Die Werte der Schmelzwärmen von kristallinem Uridin und seines Derivats, Uridin-3′-(2′)-phosphat sowie Enthalpie- und Entropiewerte der Polymerisation einer Mischung dieser Verbindungen wurden durch Differential Scanning Kalorimetrie bestimmt. Eine Analog-Komputeranalyse der mit dem Erhitzen der Verbindung verbundenen Exotherme wies auf mindestens fünf Prozesse, die aufgrund von früher publizierten experimentellen Resultaten gedeutet werden konnten.
    Notes: Abstract The heats of fusion for crystalline uridine and its phosphate derivative, uridine-3′-(2′)-phosphate, as well as the enthalpic and entropic values for the polymerization of a mixture of these compounds, have been determined by Differential Scanning Calorimetry. An analog computer analysis of the exotherm associated with heating of the mixture indicated a minimum of five processes, which could be rationalized on the basis of previously published experimental findings.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 12 (1973), S. 229-235 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Differential enthalpic analysis of a series of 3′,5′-cyclic nucleotides indicates that homolytic cleavage of the six-membered phosphate ring occurs either immediately prior to or concurrent with decomposition of the crystal lattice. Homolysis is followed by a rapid polymerization to yield oligonucleotides. The enthalpies of these reactions have, with the exception of guanosine 3′,5′-cyclic phosphate, almost identical values of 25 kcal/mole. The anomalous case is attributed to a more stabilized phosphate ring as a result of hydrogen bonding through the two position of the purine ring. The pair of overlapping exothermic peaks observed in each of the thermograms for cAMP and cIMP is related to the presence of two conformational arrangements within the unit cell of each compound.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 9 (1971), S. 521-528 
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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