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  • 1975-1979  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Levans. II. Light-scattering and sedimentation data of Streptococcus salivarius levan in water (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 1283-1292 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The molecular weights and radii of gyration of Streptococcus salivarius levan fractions were obtained from light-scattering measurements in water. Sedimentation coefficients and partial specific volumes of the fractions were also obtained. Double logarithmic plots of [η] versus M̄w and S0 versus M̄w yielded slopes having values of 0.17 and 0.62, respectively. The data and various calculated parameters show that levan from Streptococcus salivarius is highly branched and behaves hydrodynamically as a compact particle of spherical symmetry.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1975.360140616
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Levans. III. A light-scattering study of Streptococcus salivarius levan in dimethyl sulfoxide (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 2467-2478 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A light-scattering study of unfractionated and five fractions of Streptococcus salivarius levan was performed in dimethyl sulfoxide. The weight-average molecular weights M̄r in dimethyl sulfoxide, after adequate dissolution, agree with those obtained in water within a mean difference of 7%. The intrinsic viscosities [η] and root-mean-square z-average radii of gyration (Rg2)z1/2 are significantly higher in dimethyl sulfoxide than in water, reflecting the higher hydrodynamic volume in the former. The M̄r, [η], and (Rg2)z1/2 of the fractions suggest that levan has a low polydispersity. The exponent of 0.12 of the Mark-Houwink plot and model analysis confirm the branched and compact structure of levan.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1975.360141204
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    Paper (German National Licenses)
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