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  • Polymer and Materials Science  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Kinetic studies of the complex formation in the ternary system of amylose, SDS, and iodine (1984)
    New York : Wiley-Blackwell
    Biopolymers 23 (1984), S. 2083-2096 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Complex formation in the ternary system of amylose (degree of polymerization, DP, 1100), SDS, and iodine was studied statically by spectrophotometry and amperometric titration and kinetically by the pressure-jump method. It was clarified that (1) iodine (I3-) to some extent binds to amylose saturated with SDS to form an inclusion complex (ASI system); (2) the binding of SDS apparently transforms amylose of DP 1100 to that of much lower DP (less than 60) from the viewpoint of iodine binding; and (3) iodine binds to sites unoccupied by SDS in the center of the helical segment of amylose. Pressure-jump relaxation phenomenon was not observed in solutions in which iodine was dissolved prior to SDS (AIS system), but it was observed in the ASI system; it is ascribed to the association and dissociation of three molecules of iodine in the center of the amylose helix. Comparison of the rate constants in the ASI system with those in the amylose (DP 32) and iodine system indicates that iodine runs to and from the helical segment of amylose perpendicularly to the axial plane in the former, while it runs horizontally in the latter. We discuss the order of ligand mixing on the resulting structure of the ternary complexes of amylose, SDS, and iodine.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360231018
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  • 2
    Electronic Resource
    Electronic Resource
    Kinetic and equilibrium studies of the interactions of silver ions with poly(A) (1982)
    New York : Wiley-Blackwell
    Biopolymers 21 (1982), S. 1703-1711 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The interaction of silver ions with poly(A) was studied by potentiometric titration, uv spectrophotometry, and stopped-flow spectroscopy. For 0 〈 rb 〈 0.5, where rb is moles of silver ion bound per mole of nucleotide base, there exists only one type of binding for poly(A). Using McGhee's theory, the binding parameters, such as intrinsic binding constant, number of sites per nucleotide, and cooperativity, were determined from the potentiometric titration data. Using the stopped-flow method, one relaxation time was observed in 0 〈 r0 〈 0.5, where r0 is the moles of silver ions added per mole of nucleotide base. The concentration dependences of the relaxation time suggest that the binding of silver ions to poly(A) proceeds through the following mechanism: where M is free silver ions, P the free binding sites on poly(A), and C and C′ are two forms of the complex. The nature of the binding of silver ions to poly(A) is also discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360210903
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  • 3
    Electronic Resource
    Electronic Resource
    Kinetic studies of spin interconversion in ferric mixed-spin derivatives of myoglobin (1981)
    New York : Wiley-Blackwell
    Biopolymers 20 (1981), S. 187-199 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Kinetic studies of spin interconversion in various derivatives of metmyoglobin such as the fluoride, aquo, hydroxide, azide, imidazole, and cyanide were performed by the coaxial-cable temperature-jump method. For all these derivatives, except fluoride and aquomyoglobin, a single relaxation was observed around 3 μsec. The rate constants and activation parameters for the spin interconversion were estimated and are discussed in comparison with those reported for the reaction of synthetic iron complex. Other hemoproteins such as cytochrome c and human hemoglobin were also examined, and the results were compared with those for myoglobin. The effect of buffer solution is also discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1981.360200113
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetic studies of the interaction of methyl orange with poly(L-lysine) by stopped-flow with circular dichroism detection (1983)
    New York : Wiley-Blackwell
    Biopolymers 22 (1983), S. 2035-2044 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The interaction of methyl orange with poly(L-lysine) was studied kinetically by the stopped-flow technique with CD detection, as well as by static CD titration experiments. In the static experiments, the differences observed in the polymer-to-dye ratio dependences of the CD spectra and absorption spectra suggested at least two kinds of bound states of the methyl orange attached to the polymer. The kinetic experiments using the stopped-flow apparatus, however, revealed four distinct reaction processes. The reaction mechanism was elucidated from the concentration dependence of the time constant for each process as follows: the first process was attributed to the bimolecular binding step of methyl orange to the side chain of poly(L-lysine), the second and third process were ascribed to the intramolecular reaction of the polymer-dye complex, and the fourth process was found to be the intermolecular aggregation of the polymer-dye complex. The origin of the stacking of methyl orange on poly(L-lysine) is discussed on the basis of the characteristics of signal amplitudes obtained from the kinetic experiments for these processes.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360220904
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