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  • Polymer and Materials Science  (6)
  • 1
    ISSN: 1040-0397
    Keywords: Mechanism ; Coupled reactions ; Linear scan voltammetry ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Theoretical equations applying to voltammetric curves corresponding to electrochemical processes preceded by a chemical reaction under pure kinetic conditions are derived. Logarithmic analyses for CrEr, CrEi, and CrErCi, processes are proposed. The equations are tested with the aid of well-known reduction processes.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1040-0397
    Keywords: Amperometric immunoassay ; Immunoelectrode ; Immunosensor ; Hantavirus ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The determination of specific antibodies against Hantavirus in blood plasma has been developed. The assay technique is based on a flow through amperometric immunoelectrode. Highly dispersed carbon material serves as an immunosorbent and at the same time as an electrode material. The analysis employed the ‘sandwich’ assay scheme. Recombinant protein of Hantavirus was immobilized on the surface of the immunosorbent. Target analyte captured by the immunosorbent at the first stage of incubation interacts with the peroxidase labeled antihuman antibodies at the second stage of incubation. The detection of peroxidase label was conducted amperometrically by electroreduction of iodine formed as a product of peroxidase catalyzed reaction. The technique permits determination of specific antibodies against Hantavirus in blood plasma using a 22 min assay time.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Theoretical expressions are derived for electrochemical processes preceded by two concurent first-order chemical reactions in dc polarography by using both the approximation of convective diffusion under the steady state conditions and the dimensionless differential equations of the Nernst diffusion layer approximation. These equations are formally identical to those obtained for CE and CEC processes, with differences only in the kinetic terms. Study of the interaction between guanine and diacetyl shows the usefulness of these equations. A value of 7 × 104 M is obtained for the formation constant of the adduct guaninediacetyl at 25°C.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 11 (1967), S. 983-989 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: This paper attempts to prove the possibility of adhesive failure by preferential adsorption and adhesive displacement at the adherend surface. Data are presented to demonstrate different modes of failure that are possible after initial cohesive failure.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1040-0397
    Keywords: Reduction mechanisms ; Nicotinamide ; Isonicotinamide ; Electrode kinetics ; Polarography ; Voltammetry ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electroreductions of the NAD+ model compounds nicotinamide (I), N1-methyl nicotinamide (II), N′-methyl nicotinamide (III) and isonicotinamide (IV) on carbon electrodes have been studied in aqueous media in the pH range 0-12 by linear-sweep cyclic voltammetry (Scheme 1, I-IV). Logarithmic analyses of the reduction peaks were performed by computing the convolution of the current with time as a function of the potential. On the basis of the experimental results it was concluded that the irreversibility of the electron transfers increased when a glassy carbon electrode was used, and this irreversibility being more marked when a plastic formed carbon electrode was employed. The reduction processes occurred with more difficulty on carbon electrodes than on mercury electrodes. Both the reduction and the reoxidation (when occurred) processes changed with respect to those observed on mercury electrodes, being irreversible electron transfers the rate-determining steps in most cases. Thus, for compounds I, II and III at pH 〈 2 the reductions occurred by the uptake of two electrons and two H+ ions, and the rate determining step was found to be the first one-electron transfer, for I and III, and the irreversible second electron transfer, preceded by the uptake of an H+ ion, for II. At pH〉3 the processes consisted of electrodimerization reactions, preceded by the protonation of the heterocyclic nitrogen in cases I and III. The second electron transfer of the electroreduction of IV always appeared irreversible, in contrast with that found for mercury electrodes.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The syntheses of 3-acryloyloxyalkyl- and 3-acryloyloxyaryl-2-phenyl-4-thiazolidones (3a-c) from the corresponding hydroxyl derivatives 2a-c and acrylic acid chloride are described. These monomers were homopolymerized and copolymerized with N-vinyl-2-pyrrolidone by radical initiation. The resulting water soluble copolymers were tested in animals for radioprotective activity and prolongation of efficiency.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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