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  • 1
    Electronic Resource
    Electronic Resource
    Potassium microclimate at the mucosal surface of the proximal and the distal colon of guinea pig (1986)
    Springer
    Pflügers Archiv 407 (1986), S. 625-631 
    Details
    ISSN: 1432-2013
    Keywords: Guinea pig ; Colon ; Potassium ; Microclimate ; Mucus layer ; Preepithelial barrier
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract K+ concentrations were measured with K+ sensitive liquid ion exchanger microelectrodes in situ and in vitro in the mucus layer at the luminal cell surface of the proximal and the distal colon in guinea pig. In a first series of experiments K+ concentrations were increased in the luminal solution from 0 to 70 mmol·l−1; the serosal K+ concentrations were kept in vitro at 5.4 mmol·l−1. In the proximal colon mean K+ concentration in the microclimate was in vitro 7.9±3.5 mmol·l−1, and independent from mucosal concentrations. In the distal colon in vitro, and in situ in the proximal as well as in the distal colon, K+ concentrations in the microclimate were increased slightly when K+ concentrations were elevated in the luminal solution up to 70 mmol·l−1. In a second series of in vitro studies K+ concentrations were also altered in the serosal fluid. In the proximal and in the distal colon K+ concentrations increased linearily with elevated K+ concentrations in the serosal solutions. A temporarily interrupted mucosal blood flow resulted in a significant increase in the K+ concentration in the microclimate. A paracellular shunt pathway and a high preepithelial diffusion barrier for K+ would explain the observed K+ concentrations in the microclimate at the luminal cell surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00582643
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Photoelectron dynamics of the cooper minimum in free molecules (1986)
    Springer
    The European physical journal 2 (1986), S. 309-318 
    Details
    ISSN: 1434-6079
    Keywords: 33.60.Cv ; 33.80.Eh
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The general properties of the Cooper minimum in molecules are reviewed. Experimental results from synchrotron radiation together with theoretical calculations are presented on both the partial cross sections and angular distribution parameters, β. A detailed examination of HCl is used as an example. Previously unpublished results on CCl n H4−n , CCl n F4−n , ethylene dichloride, I2 and ICl are included. The Cooper minimum is largely discussed as a perturbation from atomic behavior, and is examined as a function of atomic number. The Cooper minimum is also examined as a function of chemical environment. Finally, needs for future research are briefly described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426235
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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