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  • 1
    Electronic Resource
    Electronic Resource
    A thallium-205 NMR study of thallium acetate ion association in 2,2,2-trifluoroethanol and dimethylsulfoxide (1982)
    Springer
    Journal of solution chemistry 11 (1982), S. 379-386 
    Details
    ISSN: 1572-8927
    Keywords: Dimethylsulfoxide ; thallium acetate ; trifluoroethanol ; Tl-205 NMR chemical shifts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The association of thallium acetate ion in 2,2,2-trifluoroethanol and dimethyl-sulfoxide has been investigated by thallium-205 NMR spectroscopy. Analysis of the association constants as a function of temperature indicates that in trifluoroethanol the association enthalpy and entropy are, respectively, 1.6 kcal-mol−1 and 19.3 cal-mol−1-K−1 and in dimethylsulfoxide they are-0.99 kcal-mol−1 and 18.0 cal-mol−1-K−1. Examination of the temperature dependence of the chemical shift of the ion-pair reveals that in dimethylsulfoxide the ion-pair exists as a contact species, while in trifluoroethanol the solvent-separated ion-pair is more likely.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649036
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  • 2
    Electronic Resource
    Electronic Resource
    Human ovarian tumour cells can bind hyaluronic acid via membrane CD44: a possible step in peritoneal metastasis (1996)
    Springer
    Clinical & experimental metastasis 14 (1996), S. 325-334 
    Details
    ISSN: 1573-7276
    Keywords: CD44 ; cell adhesion ; hyaluronic acid ; invasion ; mesothelial cells ; metastasis ; ovarian tumour cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Our previous studies have suggested that the interaction between hyaluronic acid (HA) on peritoneal mesothelial cells and the membrane adhesion molecule, CD44, on ovarian tumour cells could be important in ovarian cancer metastasis. In order to study this further, adhesion of six ovarian tumour lines to HA coated on to a plastic surface was investigated. Four lines bound to the HA coat and two lines did not. The adhesive lines were those that expressed high amounts of CD44, but the degree of adhesion was not closely correlated with CD44 expression. The results suggested that different tumour lines had different affinities for HA. Treatment of the HA coat with hyaluronidase substantially reduced adhesion. Adhesion was also partially reduced if the tumour cells were preincubated with either soluble HA, or anti-CD44 antibodies directed against the HA binding region. An antibody against a non-HA binding region only slightly blocked adhesion at high antibody concentrations. Only the CD44H isoform was detected by immunoprecipitation on the tumour cells. These results suggest that ovarian tumour cells can attach to immobilised HA via CD44H on the cell membrane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00123391
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    Paper (German National Licenses)
    Fulltext
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