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  • 1
    Electronic Resource
    Electronic Resource
    A new synthetic hypoglycaemic polysaccharide
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 188 (1992), S. 16-19 
    Details
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0006-291X(92)92343-V
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Surfactant effect on the lower critical solution temperature of poly(organophosphazenes) with methoxy-poly(ethylene glycol) and amino acid esters as side groups (2000)
    Springer
    Colloid & polymer science 278 (2000), S. 1097-1102 
    Details
    ISSN: 1435-1536
    Keywords: Key words Polyphosphazene ; Thermosensitivity ; Lower critical solution temperature ; Surfactant effect
    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  The surfactant effect on the lower critical solution temperature (LCST) of thermosensitive poly(organophosphazenes) with methoxy-poly(ethylene glycol) and amino acid esters as side groups was examined in terms of molecular interactions between the polyphosphazenes and surfactants including various anionic, cationic, and nonionic surfactants in aqueous solution. Most of the anionic and cationic surfactants increased the LCST of the polymers: the LCST increased more sharply with increasing length and hydrophobicity of the hydrophobic part of the surfactant molecule. The ΔLCSTs (T 0.03M − T 0M), the change in the LCST by addition of 0 and 0.03 M sodium dodecyl sulfate (SDS), were found to be 7.0 and 14.5 °C for the polymers bearing ethyl esters of glycine and aspartic acid, respectively. The LCST increase of poly(organophosphazene) having a more hydrophobic aspartic acid ethyl ester was 2 times larger compared with that of the polymer having glycine ethyl ester as a side group. The binding behavior of SDS to the polymer bearing glycine ethyl ester as a hydrophobic group was explained from the results of titration of the polymer solutions containing SDS with tetrapropylammonium bromide. Graphic models for the molecular interactions of polymer/surfactant and polymer/surfactant/salt in aqueous solutions were proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960000368
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Flavonoids as inducers of extracellular proteins and exopolysaccharides of Sinorhizobium fredii (1999)
    Springer
    Biology and fertility of soils 30 (1999), S. 83-89 
    Details
    ISSN: 1432-0789
    Keywords: Key words Sinorhizobium fredii ; Flavonoids ; Extracellular proteins ; Exopolysaccharides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Some flavonoids present in root exudates are inducers of nod genes in rhizobia-legume symbioses. They also induce changes in the molecular weight, structure, and level of secretion of some extracellular proteins, exopolysaccharides (EPS) and lipopolysaccharides. We showed that incubation of Sinorhizobium fredii USDA 257 with four flavonoids (genistein, naringenin, chrysin, and apigenin) promoted its growth in the late log phase. By contrast, only genistein accelerated the growth of S. fredii TU 6 under the same conditions. When both strains were incubated with naringenin the synthesis of EPS decreased. However, this compound increased the secretion of extracellular proteins in the early log phase. The specific mode of action of naringenin is still not clear.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050591
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    Paper (German National Licenses)
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