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  • 1
    Electronic Resource
    Electronic Resource
    Preparation of poly(aryleneethynylene)-type copolymers containing flexible linking methylene units. Optical properties of the copolymers suggesting occurrence of energy transfer between π-conjugated local units (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 36 (1998), S. 2201-2207 
    Details
    ISSN: 0887-624X
    Keywords: poly(aryleneethynylene) ; palladium-catalyzed ; copolymer ; optical properties ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Palladium-catalyzed polycondensation between 2,5-diiodo-3-hexylthiophene I-Th(Hex)-I with mixtures of p-diethynylbenzene HC≡C - Ph - C≡CH and α,ω-diethynylalkane HC≡C(CH2)lC≡CH (l = 3 or 8) gives poly(aryleneethynylene) PAE-type copolymers [C≡C(CH2)lC≡C - Th(Hex)]m[C≡C - Ph - C≡C - Th(Hex)]n containing the methylene unit. The copolymers have a molecular weight (Mn) of about 1.2 × 104 as determined by GPC (polystyrene standard) and are considered to possess essentially a random sequences in view of the  - C≡C(CH2)lC≡C -  and  - C≡C - Ph - C≡C -  units as judged from their UV-visible spectra. By the incorporation of the (CH2)l unit, the λmax position of the corresponding PAE homopolymer [C≡C - Ph - C≡C - Th(Hex)]n is shifted to a shorter wavelength. However, the copolymers give rise to a photoluminescence PL peak essentially agreeing with a PL peak of the homopolymer, suggesting occurrence of energy transfer in the copolymer. © 1998 John Wiley & Sons, Inc. J. Polym. Sci. A Polym. Chem. 36: 2201-2207, 1998
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Multi-electron transfer in photoelectrochemical processes (1995)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 6 (1995), S. 115-117 
    Details
    ISSN: 1042-7147
    Keywords: photoelectrochemistry ; multi-electron transfer ; semiconductor particle ; light excitation ; molecular conversion reactions ; 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
    Notes: Simultaneous bidirectional forward and backward electron transfers take place on a light-exited semiconductor particle, even at the same geometric site. The potentials of the electron pathways are different, giving rise to two independent molecular conversion reactions. This type of multi-electron transfer reactions is overviewed and the stepwise unidirectional multi-electron transfer on the excited semiconductor particle is also described.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pat.1995.220060304
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of the number of crosslinks in collagens from mechanical properties of swollen fibers (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 62 (1996), S. 1577-1586 
    Details
    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: A method for the determination of crosslink density for collagen fibers was proposed. The number of interchain crosslinkages in whale ligament and rat-tail tendon was estimated by applying an usual rubber elasticity theory. Collagen fibers swollen in a solution composed of equal volumes of 8M LiBr aqueous solution and diethylene glycol monoalkyl ether showed a typical rubber elasticity. The energy components to total retractive forces were similar in order in magnitude for crosslinked natural rubbers, namely, below 0.3. It was found that no intermolecular crosslinkage occurs between tropocollagen molecules in tendon from a 2-month-old rat, while there are about 12 crosslinking sites per molecule in tendon from a 10-month-old rat and 15 sites in whale ligament. The number, type, and crosslinking sites in the tendon crosslinked with 1,3-bis(vinylsulfonyl)-2-propanol is also discussed. © 1996 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Flow-type cyanide sensor using an immobilized microorganism (1996)
    Weinheim : Wiley-Blackwell
    Electroanalysis 8 (1996), S. 876-879 
    Details
    ISSN: 1040-0397
    Keywords: Cyanide ; Saccharomyces cerevisiae ; Respiration inhibition ; Flow system ; Reactor-type microbial sensor ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A flow system for cyanide detection using Saccharomyces cerevisiae is described. This sensor system consists of two oxygen electrodes and immobilized S. cerevisiae whose respiration activity is measured by the oxygen electrodes. Since cyanide inhibits S. cerevisiae's respiration, it can be detected by measuring this inhibition. Two types of systems were constructed, characterized and compared. One is a membrane-type flow system in which S. cerevisiae was immobilized onto a cellulose membrane. The other is a reactor-type flow system in which S. cerevisiae was immobilized onto the glass beads. The sensor response was examined in the range from 0 to 15μM. The reactor-type sensor system displayed lower detection limit (0.15 μM) and better stability (16 days).
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140081005
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