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  • 1
    Digitale Medien
    Digitale Medien
    Interactions of water-soluble polymers with small molecules II: Poly(2-diethylaminoethyl methacrylate)-methyl orange and its homolog systems at different temperatures (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 756-763 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Equilibrium dialysis ; hydrophobic interaction ; electrostatic interaction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract In order to investigate the interactions of poly(2-diethylaminoethyl methacrylate) (PDEAEMA) with methyl orange and its homologs in solution, temperature dependence of the complex formation has been examined in detail by the measurements of transmittance and specific conductance for the systems. Furthermore, the binding course of dyes to PDEAEMA has been studied on the basis of thermodynamic parameters obtained from equilibrium dialysis experiments at different temperatures. It was observed that the flocculation process shifted to lower dye concentrations in accordance with increasing hydrophobicity of the dyes in the order, methyl orange 〈 ethyl orange 〈 butyl orange, and the process of complex formation was characterized by three separate regions according to the slope of specific conductivity-mixing ratio curve for mixtures of PDEAEMA and dye. The temperature dependences of ΔF,ΔH and ΔS suggest that, for dyes-PDEAEMA complex formation, the hydrophobic interaction is predominant at a low temperature but the electrostatic interaction becomes important as the temperature increases.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01500750
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Ensemble noise and current relaxation analysis of K+ current in single isolated salivary acinar cells from rat (1986)
    Springer
    Pflügers Archiv 406 (1986), S. 69-72 
    Details
    ISSN: 1432-2013
    Schlagwort(e): K+ channels ; Acinar cells ; Ensemble noise analysis ; Current relaxation ; Patch-clamp whole cell recording
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The K+ channel in rat parotid gland acinar cells were investigated by ensemble current noise analysis in single isolated cells employing the giga-seal whole cell current recording mode. Sets of 20–40 identical de- and hyperpolarization voltage steps were applied and the resultant current records were processed by computer to obtain the mean and the variance of the current. The time-course of the mean current could be fitted by the sum of two exponentials, suggesting a 3-state model. The simplest plausible hypothesis is a model with one open and two closed states. Assuming this model, the relationship between the variance (σ2) and the mean current (I) could be fitted by the function σ2/I=i−I/N. The estimated single channeli/V-relations were similar to those taken from single channel current recordings, and the size of the population of channels per cell (N) was 76±26 (n=12). The validity of the model was tested by a successful simulation of the time-course of the variance.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00582956
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  • 3
    Digitale Medien
    Digitale Medien
    Interactions of water-soluble polymers with small molecules I: Poly(2-diethylaminoethyl methacrylate)-orange II and ethyl orange systems (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 748-755 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Poly(2-diethylaminoethyl methacrylate) ; flocculation ; deflocculation ; hydrogen bonding ; hydrophobic bonding
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract The interactions between poly(2-diethylaminoethyl methacrylate) (PDEAEMA) and orange II (OII) or ethyl orange (EO) have been examined in detail by measuring the transmittance and the specific conductance of the solutions. The mechanisms of flocculation and deflocculation have been investigated by changing the intrinsic viscosity, the degree of neutralization and alkyl groups of PDEAEMA or by adding NaCl, urea or alcohols. The complexation of PDEAEMA with dyes is completed at the same mole ratio but is not dependent on the molecular weight of PDEAEMA. OII molecules bind with PDEAEMA by electrostatic interactions, followed by flocculation through hydrogen bondings between hydroxyl groups on OII molecules bound. EO molecules first interact with PDEAEMA electrostatically in the same ways as OII, but flocculation occurs by hydrophobic interactions between ethyl groups on EO molecules bound. By further addition of dyes to the complex, OII or EO molecules already bound can interact with free OII or EO molecules newly added through hydrogen/hydrophobic interaction between OII or EO molecules. Deflocculation occurs by the electrostatic repulsion between anions of dyes bound, such as (PDEAEMA-OII)-hydrogen bonding-(OII-anions) or (PDEAEMA-EO)-hydrophobic bonding-(EO-anions) newly formed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01500749
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