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  • 1
    Electronic Resource
    Electronic Resource
    Effect of Verapamil on ionized calcium excretion in human parotid saliva (1979)
    Springer
    European journal of clinical pharmacology 16 (1979), S. 7-9 
    Details
    ISSN: 1432-1041
    Keywords: Verapamil ; salivary calcium ; ionized calcium ; parotid gland
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effect of Verapamil on ionized calcium transport in the parotid gland and duct system was investigated in eight male volunteers. Transepithelial Ca++-transport was inhibited, as shown by markedly enhanced excretion of calcium in parotid saliva.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644959
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  • 2
    Electronic Resource
    Electronic Resource
    K. Cammann, H. Galster: Das Arbeiten mit ionenselekti ven Elektroden. Eine Einführung für den Praktiker, 3. Aufl., 296 S., 104 Abb., 52 Tab., 607 Literaturzitate, Springer-Verlag, Berlin, Heidelberg, New York, Barcelona, Budapest, Hongkong, London, Mailand, Paris, Santa Clara, Singapur, Tokio, DM 128,00, ISBN 3-540-59153-2 (1996)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 338 (1996), S. 688-689 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.199633801134
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  • 3
    Electronic Resource
    Electronic Resource
    Biosensoren auf der Basis von Katalasemembranen unter Nutzung der enzymatischen Doppelfunktion zur molekularselektiven Carrier-Analyse von Ethanol (1996)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 338 (1996), S. 532-537 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Biosensors Based on Catalase Membranes with Utilization of Enzymatic Bifunctionality for Molecular-selective Carrier-Analysis of EthanolA robust bioelectrochemical measuring system for amperometric electroanalysis of ethanol is presented, which allows measurements between 0.01 and 99.8 vol.% of ethanol without preceeding dilution. It is distinguished by long-lived biosensors based on bifunctional catalase membranes. Besides the O2-sensitive enzymatic biosensor the design includes components for intermediate carrier analysis such as a microdialysator for analyte uptake into buffered, H2O2 containing carrier solution out of the sample solution both with tangential countercurrent fluxes, an oxigenating pump for constant pO2 in the carrier stream, a pressure adjusting chamber as protection from variing pressure on the enzyme membrane resulting from the roller pump's pulsations. Utilization of the membrane's catalatic and peroxidatic bifunctionality is the basis of ethanol analysis: peroxidatically acting catalase molecules cannot release oxygen by catalatic reaction of H2O2 at the same time.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.199633801100
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  • 4
    Electronic Resource
    Electronic Resource
    Zum Funktionsprinzip von Elektrodenmembranen mit dem Carboxyl-Ionophoren Monensin an Festkontaktsensoren (1988)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 332 (1988), S. 52-57 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The transport antibiotic Monensin acts as an electrogenic carrier in PVC membranes on Ag/AgCl/Pt solid contacts of disk electrodes. By way of experiments, it was possible to derive the existence of MonH · Na+ complexes from the operational principle of the electrode membranes. The non-physiological formation of protonized, positively charged complexes occurs owing to the high permittivity of o-NPOE as a plasticizer so that the ligand can become effective as an electrically neutral carrier. This is to be taken as the cause for Na+ to become the ion determining the potential also in measurements in the neutral point region; for it is the physiological effect of Monensin in thin biological membranes to mediate, as an exchange diffusion carrier, a Na +-proton countertransport at a 1∶1 ratio. This, however, is undesirable in measurements of the electromotive force (e.m.f.) since otherwise there would be no net charge transfer or formation of a potential difference at the lipophilic electrode membrane/aqueous measuring solution interface dependent upon the Na+ ion activity. The Monensin methylester was used as an electrically neutral ionophor for comparison. Likely, the lipophilic anion tetraphenyl borate causes the formation of MonH · Na+TPB− complexes, whereby the neutral molecule Monensin, presumably due to intermolecular hydrogen bonds to the lipophilic anion, undergoes a further distortion in the coordination sphere entailing undesirable electrode characteristics. Under the influence of o-NPOE as a plasticizer, long-lived Na+ selective PVC membranes including Monensin or its methylester derivative, have been realized, which applied on disk electrodes produce reliable sensors for analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00487031
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  • 5
    Electronic Resource
    Electronic Resource
    Natrium-Sensor mit ausgeprägter Diskriminierung von Kalium- und Lithium-Ionen auf der Basis einer Carrier-PVC-Membran (1992)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 342 (1992), S. 611-613 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Aufgrund modelltheoretischer Überlegungen bezüglich der unterschiedlichen Kaliumselektivität einiger Transportantibiotica aus der Valinomycin-Gruppe ist zur Erzielung hoher Selektivitäten eine ausreichende Rigidität der Hohlraumstruktur zu fordern. Daher wurde in Analogie dazu für die Konzipierung eines hochselektiven Natrium-Sensors ein in seiner Ringflexibilität eingeschränkter überbrückter Hemisphärand als ionophorer Carrier in eine PVC-Membran inkorporiert. Das natriumselektive Membransystem weist eine Selektivität gegenüber K− von 460:1 und Li− von 2179:1 (K−1 Na +−S+) auf. Diese hohe Diskriminierung beider Störionen wurde anderen natriumselektiven Membransystemen gegenübergestellt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324511
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  • 6
    Electronic Resource
    Electronic Resource
    Minimization of the acetate interference of calcium-selective carrier-PVC-membrane electrodes for process-controlled haemodialysis (1993)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 347 (1993), S. 299-302 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Up to now calcium-selective electrodes with carrier-PVC-membranes have shown a need for correction during their application in controlling the process at an artificial kidney, for the presence of acetate anions leads to immense differences of measurements because of the anion interference. On the basis of experimental research the membrane characteristics could be changed in such a way that there is no need to correct the measurements when the electrodes are used during bicarbonate haemodialyses with 2 mmol/1 acetate. This was achieved by optimizing the ratio of the concentration of synthetic, electrically neutral carrier and lipophilic anion and by using plasticizer effects. A special membrane was developed in the same way for an application in dialysis solutions with 35 mmol/l acetate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323976
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  • 7
    Electronic Resource
    Electronic Resource
    Langlebige me\wertstabile pO2-Elektrode mit anodischer Sperrschicht für Ag+ (1980)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 303 (1980), S. 414-415 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Sauerstoff ; pO2-Elektrode ; anod. Sperrschicht für Ag+
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00470008
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  • 8
    Electronic Resource
    Electronic Resource
    Über den Einfluß von Weichmachern auf die Characteristica der Kalium-Valinomycin-Diskelektrode (1978)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 292 (1978), S. 391-395 
    Details
    ISSN: 1618-2650
    Keywords: Elektroden, ionenselektive ; Kalium-Valinomycin-Diskelektrode, PVC-Membranmatrix, Weichmachereinfluß
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Der Einfluß von sechs verschiedenen Weichmachern in der PVC-Matrix auf die Characteristica der Kalium-Valinomycin-Diskelektrode wird untersucht. Die Weichmacher, die selbst eine gewisse Kalium-Selektivität nach Konditionierung in einer KCl-Lösung zeigen, verändern die Selektivitätsverhältnisse, Potentialkonstanz, Potentialreproduzierbarkeit und andere Parameter in auffälliger Weise. Es wird darauf hingewiesen, daß eine Elektrodenoptimierung anwendungsbezogen erfolgen sollte.
    Notes: Summary The influence of six different plasticisers — added to the PVC-matrix — on the characteristics of the potassium-valinomycin disc electrode is investigated. The plasticisers, which themselves show some selectivity for potassium ions after treatment in KCl solution, change the selectivities, the stability and reproduction of potentials and other parameters in a striking way. It is pointed out, that an optimation of electrodes should be made with respect to application in practice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00481559
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  • 9
    Electronic Resource
    Electronic Resource
    Siloxanverbindungen als aktive Komponenten in ionenselektiven Elektrodenmembranen (1978)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 290 (1978), S. 45-45 
    Details
    ISSN: 1618-2650
    Keywords: Elektroden, ionenselektive ; Verw. von Siloxanverbindungen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00468862
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Funktionsweise der inneren Festableitung ionenselektiver Diskelektroden. I (1979)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 295 (1979), S. 248-251 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00481485
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