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  • 1995-1999  (2)
  • Polymer and Materials Science  (1)
  • parallel transport theory  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Effects of affinity and aggregation on parallel diffusion of tri-sulfonated azo compounds into water-swollen cellulose membranes (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 1145-1151 
    Details
    ISSN: 1435-1536
    Keywords: Anionic dye ; aggregation ; affinity ; cellulose membrane ; parallel transport theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Adsorption and diffusion of tri-sulfonated azo dyes, C.I. Acid Red 18 and C.I. Acid Red 27 onto waterswollen cellulose membrane has been studied at 25°C. Affinities of these dyes onto cellulose were evaluated by the coefficients of Freundlich equation. Diffusion behavior of these days was analyzed on the basis of a parallel transport theory by surface and pore diffusion. The results could be described by the parallel diffusion model provided that adsorption was stimulated by addition of NaCl. The surface diffusivities for the parallel diffusion model were correlated by the affinity of the dyes, on the other hand, the pore diffusivities for the model were affected by aggregation of the dye depending on its structure and NaCl concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655685
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Characteristic interaction of Ca2+ ions with elastin coacervate: Ion transport study across coacervate layers of α-elastin and elastin model polypeptide, (Val-Pro-Gly-Val-Gly)n (1996)
    New York : Wiley-Blackwell
    Biopolymers 39 (1996), S. 189-198 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ion transport characteristics across a macrocoacervate layer membrane composed of aqueous elastin model polypeptides with a specific repeating pentapeptide sequence, H-(Val-Pro-Gly-Val-Gly)n-Val-OMe (n ≥ 40), were investigated. Transmembrane potential responses for NaCl, MgCl2, and CaCl2 concentration-cell systems were measured and examined systematically by comparing with those across a coacervate membrane composed of bovine neck ligamental α-elastin. In the case of the NaCl and MgCl2 systems, potential responses across these protein liquid membranes were different noticeably from each other depending upon the molecular structure with and without charged peptide side chains, whereas in the CaCl2 systems the transmembrane potential responses across the noncharged polypentapeptide coacervate membrane were comparable with those across the α-elastin coacervate membrane carrying both the positively and negatively charged amino acid residues as an amphoteric ion-exchange membrane. These results indicated that mechanisms of major Ca2+ ion transport are based on the specific and selective interactions with electrically neutral sites of elastin, such as the polypentapeptide backbone chain. © 1996 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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