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  • 1
    Electronic Resource
    Electronic Resource
    Thermal properties of collagen in helical and random coiled states in the temperature range from 4° to 300°K (1976)
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1991-2004 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The low-temperature heat capacity of collagen (in the hydrated and dehydrated states) and the large entropy of collagen in the coiled state relative to the same protein in the helical state were investigated. The heat capacity for collagen in the solid state in the temperature range 4°-50° K changes proportionally to the square of temperature (Cp ∼ T2). Above 50°K there is a linear dependence (Cp ∼ T). The differences in the character of temperature dependence of heat capacity for the hydrated and dehydrated collagen show the importance of the specific interaction of water molecules with polypeptide chains of this protein. The peculiarities of the temperature dependence of the heat capacity difference (ΔCp) of hydrated denatured (random coiled) and hydrated native (helical) collagen are observed at 15°, 120°, and 240°K. These differences are caused by the varying degree of ordering of the hydrate water molecules in native and denatured collagen macromolecules. At all temperatures (4°-300°K) the entropy of the random coiled state is higher than that of collagen in the native state and at 298°K ΔS0298 = ∫0298 (ΔCp/T)dT = 0.8 cal/100 g °K.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1976.360151010
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Microcalorimetric investigation of dilute and concentrated solutions and films of the polydeoxynucleotide poly[d(A-T)·d(A-T)] (1974)
    New York : Wiley-Blackwell
    Biopolymers 13 (1974), S. 1751-1756 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Microcalorimetric heat capacity measurements on dilute and concentrated solutions and films of poly[d(A-T)·d(A-T)] in 2 M sodium chloride have been carried out. Values for enthalpy, entropy, and temperature of the helix-coil transition have been found to depend on the polymer concentration, and to have maxima near 20% (w/w) of polymer. The results are discussed in terms of polynucleotide hydration as one of the structure stabilizing factors.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1974.360130908
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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