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  • 2000-2004  (1)
  • 1975-1979  (2)
  • Elektroden, ionenselektive  (2)
  • 1H-NMR in 1H2O  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 299 (1979), S. 115-118 
    ISSN: 1618-2650
    Keywords: Elektroden, ionenselektive ; coated glass, Carrier-PVC-Membran, Na, K, NH4, Ca
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Na+-, K+-, NH 4 + - und Ca2+ selektive coated glass-Elektroden wurden entwickelt, bei denen eine ionenselektive Carrier-PVC-Membran auf eine ionenselektive Glasschicht aufgebracht wird, die über einen Innenelektrolyten mit der Ableitelektrode in Verbindung steht. Die Selektivität wird durch die aufgebrachte Carrier-PVC-Membran bestimmt, die zusätzlich Weichmacher zur Optimierung der Eigenschaften enthält.
    Notes: Summary Na+, K+, NH 4 + and Ca2+ selective electrodes have been developed by coating the ion-selective glass layer with a carrier PVC membrane. The glass is in contact with the conducting electrode through an inner electrolyte. The selectivity is determined by the PVC membrane, containing neutral carriers or electrically charged ligands and additionally plasticizers for optimizing the properties.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 295 (1979), S. 248-251 
    ISSN: 1618-2650
    Keywords: Elektroden, ionenselektive ; Diskelektroden, innere Ableitung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Diskelektroden mit Direktkontaktierung der ionenselektiven Membran durch Pt-, Ag-oder Cu-Drähte zeigen eine Abhängigkeit des Potentials vom O2-Partialdruck. Das Ausmaß dieser Abhängigkeit sowie Potentialdriften werden von der Membrandicke und -konsistenz beeinflußt. Elektroden mit innerer Ag/AgCl/Metall-Ableitung sind nicht O2-abhängig. Zusätzlich zur O2-Unabhängigkeit zeichnen sich Elektroden mit Ag/AgCl/Pt-Ableitung durch hohe Potentialstabilität aus.
    Notes: Summary Diskelectrodes with direct contact of Pt, Ag or Cu wires to the ion-selective membrane show dependence of the potential on the partial pressure of oxygen. The extent of this dependence and drifts of the potential are affected by thickness and consistence of membranes. Electrodes with internal Ag/AgCl/metal lead are independent of oxygen. In addition, electrodes with Ag/AgCl/Pt lead are of remarkable stability of potential.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Biotechnology letters 22 (2000), S. 1135-1141 
    ISSN: 1573-6776
    Keywords: aerobic biotransformations ; in situ 1H-NMR ; 1H-NMR in 1H2O
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A simple device for taking in situ proton NMR measurements in 1H2O is described. This allows aeration of reactions in a 10 mm diameter NMR tube without modifying the magnet or the probe head. With this device, aerobic biotransformations can be monitored in the NMR-tube placed in the spectrometer. It allows in situ analyses of the transformations, separating the aeration period temporally from the measurement time, not unlike traditional Warburg respiratory experiments. Two reactions determining kinetic and stoichieometric parameters: (i) a biotransformation by a growing Pseudomonas putida culture and (ii) l-phenylalanine oxidation catalysed by l-amino acid oxidase [E.C. 1.4.3.2]; both incubations were contained in the magnet.
    Type of Medium: Electronic Resource
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