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  • 1
    Electronic Resource
    Electronic Resource
    Solution and gelling properties of polysaccharide polyelectrolytes
    Amsterdam : Elsevier
    Biophysical Chemistry 41 (1991), S. 61-71 
    Details
    ISSN: 0301-4622
    Keywords: Microbial polysaccharides ; Polysaccharide polyelectrolytes ; Solution and gelling properties
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0301-4622(91)87210-V
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  • 2
    Electronic Resource
    Electronic Resource
    Heat of interaction of DNA with polylysine and trilysine (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 675-677 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1975.360140319
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  • 3
    Electronic Resource
    Electronic Resource
    Calorimetric data on salt-induced conformational transitions of ionic polysaccharides in aqueous solution (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 219-223 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820124
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  • 4
    Electronic Resource
    Electronic Resource
    Interactions between Co(III) and Ni(II) complex ions and polyelectrolytes (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 6 (1968), S. 1093-1100 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: An investigation has been carried out of the interaction of optically active tris(ethylenediamine)-Co(III) and of tris(o-phenanthroline)-Ni(II) complex ions with different polyelectrolytes in dilute aqueous solution. Optical rotatory dispersion measurements reveal that binding of the Co(III) complex ions occurs with a noticeable degree of specificity which in addition to depending on the nature of the fixed charges is also affected by the chemical constitution of the polyelectrolytes chain backbones. The dependence of tris(ethylenediamine)-Co(III) optical activity on polyelectrolyte concentration also exhibits interesting features. Polarimetric measurements of the rate of racemization of tris(o-phenanthroline)-Ni(II) ions in the presence of different polyelectrolytes lead to similar conclusions. Sodium dextran sulfate is shown to interact selectively with one of the antipodes of tris(phenanthroline)-Ni(II) complex.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.160060605
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of stereoregularity on binding of counterions by poly(methacrylic acid) (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 5 (1967), S. 771-780 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The activity coefficient γNa+, of sodium ion, in aqueous solutions of both isotactic and conventional poly(methacrylic acid) (PMA) has been studies throughout the whole range of degree of neutralization α with a Beckman Na electrode and membrane electrodes. The results show that the fraction of sodium ions bound to isotactic PMA is higher than that bound to conventional (or syndiotactic) PMA over the entire range of α. The binding of divalent counterions (Mg+2, Cu+2, Co+2, and Ni+2) by the two forms of PMA (at α = 0.95) has been evaluated from the release of Na+ ions with the Beckman Na electrode. Turbidimetric determinations of the critical amount of various divalent cation chlorides necessary to bring about precipitation of both isotactic and conventional PMA (at α = 0.95) have also been carried out.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.160050412
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  • 6
    Electronic Resource
    Electronic Resource
    Aggregation and helix - coil transition of poly-L-glutamic acid in pyridine - water solution (1972)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 158 (1972), S. 53-63 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Konformation von Poly-L-glutaminsäure (PLGA) in Pyridin/Wasser-Gemischen wurde mit Hilfe verschiedener Techniken untersucht (ORD, IR, NMR und Viskosimetrie). Es wurde gefunden, daß bei niedrigen Wassergehalten PLGA Aggregate bildet, deren Stabilität sehr empfindlich von der Temperatur und der Zusammensetzung des Lösungsmittelgemisches abhängt. Bei höherem Wassergehalt des Mediums findet eine Helix-Knäuel-Umwandlung statt.
    Notes: The conformational state of poly-L-glutamic acid (PLGA) in the mixed solvent pyridine/water has been studied by means of different techniques (ORD, IR, PMR, and viscosity). It has been found that at low water contents PLGA forms aggregates the stability of which depends in a sensitive manner on temperature and solvent composition.At higher water content PLGA undergoes a helix-coil transition.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1972.021580106
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  • 7
    Electronic Resource
    Electronic Resource
    Conformational transition of poly(L-glutamic acid) in aqueous solution (1966)
    New York : Wiley-Blackwell
    Biopolymers 4 (1966), S. 529-538 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Further direct evidences are given that a clear correlation exists between potentiometric and spectroscopic measurements in monitoring the poly(L-glutamic, acid) helix+ coil transtition. Specific Li+ ion poly (L-glUtamic acid) interactions have been observed, suresting that Li+ ions may exert a distinct destabilizing action on the helical conformation of the polyelectrolyte.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1966.360040505
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  • 8
    Electronic Resource
    Electronic Resource
    On the interaction between actinomycin D and DNA (1976)
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 595-597 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1976.360150316
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  • 9
    Electronic Resource
    Electronic Resource
    Solution properties of exocellular polysaccharides of rhizobium leguminosarum. Static and dynamic light-scattering: Characterization in dilute solution (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 33 (1995), S. 1833-1846 
    Details
    ISSN: 0887-6266
    Keywords: static and dynamic light scattering ; microbial polysaccharides ; Kuhn segment, coil → helix transition ; influence of long side chains ; chain stiffness ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Three polysaccharides, Rhizobium leguminosarum 8002 EPS(I), Rhizobium trifolii TA1-EPS (II), Rhizobium leguminosarum 127K87 EPS (III), produced by bacteria of Rhizobium genus have been investigated by static and dynamic light scattering combined with chirooptical measurements. All three polymers have the same backbone but differ in the length of the side chains and in the content of minor substituents. An isothermal conformational transition coil → helix was observed with I and II by adding salt (NaCl). The molecular parameters of the polysaccharides in the ordered state were determined by light-scattering data. Increasing the ionic strength a shrinking of the helix was observed accompanied by a corresponding decrease in the radius of gyration. An extraordinary chain stiffness in terms of Kuhn segment lengths was found in both cases, similar to that already observed for other microbial polysaccharides. In the case of III no disorder → order transition was induced by the salt, and the scattering behavior corresponds to that of a rather flexible polymer with a characteristic ratio C∞ = 24. The incapability of III to form a helical structure is attributed to the effect of the very long side chain. The analysis of the time correlation functions revealed typical flexible chain behavior for all three polysaccharides. This behavior for the two ordered polymers is in agreement with a recent theory by Maggs and is due to bending modes of the rods. ©1995 John Wiley & Sons, Inc.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1995.090331213
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  • 10
    Electronic Resource
    Electronic Resource
    Calorimetric investigation of poly(methacrylic acid) and poly(acrylic acid) in aqueous solution (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 10 (1972), S. 357-368 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The enthalpy of dissociation of poly(acrylic acid) and of poly(methacrylic acid) in water and in 0.5N NaCl at 25°C has been measured over a wide range of degrees of neutralization of the polyelectrolytes. In the case of poly(methacrylic acid) the calorimetric data permit the direct evaluation of the enthalpy of conformational transition of the polymer. For this transition, with the aid of standard free energy data derived from potentiometric titrations, the change in entropy was also estimated. The relative accuracy of the thermodynamic data, and the possibility of deriving therefrom information on the mechanism of transitions of the type, globular coils → expanded coils for partially hydrophobic synthetic polyelectrolytes in aqueous solution are discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.160100215
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