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  • 1
    Electronic Resource
    Electronic Resource
    Independence of length and temperature effects on the rate of helix formation between complementary ribopolymers (1972)
    New York : Wiley-Blackwell
    Biopolymers 11 (1972), S. 549-561 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The rate of double helix formation by single stranded Poly A plus Poly U, Poly I plus Poly C, Poly G plus Poly C, and T2 DNA has been investigated as a function of both the length of the reacting strands and temperature. The length dependence of the rate is found to be independent of temperature. All of the reactions studied show a rate approximately proportional to the square root of the length of the shorter of the complementary strands. At or about 30°C below the melting temperature the ribopolymers react with about the same rate. This rate is four to five times slower than DNA renaturation rates. The effect of temperature on ribopolymer reaction rates is interpreted in terms of a steady-state model for helix propagation.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1972.360110303
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the kinetics of helix formation between complementary ribohomopolymes and deoxyribohomopolymers (1972)
    New York : Wiley-Blackwell
    Biopolymers 11 (1972), S. 1485-1497 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The rate of double helix formation by single-stranded poly A plus poly dT, poly dA plus poly U, poly dA plus dT, poly G plus poly dC, poly dG plus poly C, and poly dG plus poly dC have been investigated and compared to rates of ribohomopolymer helix formation rates. After correction for molecular weight, comparisons of rate data at 30°C below the melting temperature of the double helix show that: 1Rates of helix formation by all combinations of guanine plus cytosine homopolymers are the same.1The rate of helix formation for poly dA plus poly dT is three times faster than the rate for poly A plus poly U. Rates of formation of DNA-RNA hybrid molecules are intermediate between these two rates, but closer to the poly dA plus poly dT rate.The effect of temperature on the rate of helix formation is interpreted in terms of a steady-state model for helix propagation. The results are consistent with a mechanism in which the formation of the second base pair is the rate-determining step.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1972.360110712
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Induced circular dichroism of DNA-dye complexes (1973)
    New York : Wiley-Blackwell
    Biopolymers 12 (1973), S. 1099-1122 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The binding of methylene blue, proflavine, and ethidium bromide with DNA has been studied by spectrophotometric titration. Methylene blue and proflavine or methylene blue and ethidium bromide were simultaneously titrated by DNA. The results indicate that all of these dyes compete for the same bindine sites. The binding properties are discussed in terms of symmetry.The optical properties of the dye-DNA complexes have been studied as a function of DNA/dye ratio. The induced circular dichriosm due to dye-dye interaction was measured at low dye/DNA ratios for cases involving both the same dye and different dyes. A positive Cotton effect for DNA-proflavine complex may be induced at 465 mμ by eithr proflavine or ethidium bromide, whereas a netgative Cotton effect at 465 mμ may be induced by methylene blue. The limiting circular dichroism, with no dye-dye interaction, and the induced circular dichroism spectra are discussed in terms of symmetry rules.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1973.360120514
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  • 4
    Electronic Resource
    Electronic Resource
    Reactions and kinetic modelling of silicone-carbon resins (1997)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 248 (1997), S. 1-21 
    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: Die Berechnung der mittleren Molekulargewichte einer idealen, nichtlinearen, stufenweise ablaufenden Polymerisation von Comonomeren mit mehreen reaktiven Zentren im B-Zustand vor der Gelierung wird beschrieben. Ein kinetisches Modell wird angewendet, um den Verlauf der Polymerisation unter Berücksichtigung der Massenverhältnisse der möglichen, unterschiedlich substituierten Verbindungen zu simulieren. Die Molekulargewichte werden entweder durch Anwenden der Miller-Macosko-Methode oder durch Lösen der Diffentialgelicheungen für die Polymerisation von Verbindungen mit niedrigem Molekulargewicht erhalten. Die Näherung wird angewendet auf die mit Platin katalysierte Hydrosilylierung von methylsubstituiertem Cyclosiloxan mit Dicyclopentadien zu einem Hochleistungs-Silikon-Kohlenstoff-Harz. Die Näherung ergibt die Konzentrationen und Molekulargewichte der verschiedenen, zu jedem beliebigen Zeitpunkt der Reaktion vorhandenen Verbindungen. Unterschiedliche Arten der Monomeraddition können ebenfalls simuliert werden.
    Notes: This paper aims to calculate the average properties of ideal non-linear stepwise polymerization of comonomers containing multiple reacting sites at the B-stage prior to gelation. A kinetic model is used to simulate the polymerization process taking into account the mass balances of differently substituted species possible. The molecular weights are obtained either by the use of the Miller-Macosko method or by solving the differential equations for the polymerization of low-molecular-weight species. The approach is applied to the Pt-catalyzed hydrosilation reaction between methyl-substituted cyclosiloxane and dicyclopentadiene which produces a high-performance silicone-carbon. resin. The approach gives the concentrations of various species present at any given time and the molecular weights. Different modes of monomer addition can also be simulated.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1997.052480101
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    Paper (German National Licenses)
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