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  • 1970-1974  (4)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Absence of adenine nucleotide release from autonomic ganglion (1974)
    [s.l.] : Nature Publishing Group
    Nature 249 (1974), S. 576-577 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The superior cervical ganglion of the cat was perfused4-5 either with 'normal' Krebs solution (composition in mM: NaCl, 120; KC1, 4.6; CaCl2, 2.4; NaHCCh, 25; KH2PO4, 1.2; MgSO4.7H2O, 1.2; glucose, 9.9; neostigmine bromide, 0.03) or with a Krebs solution that did not contain CaCl2 or MgSO* but ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/249576a0
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Observations on the effect of organic solvents in the direct-reading emission-spectrometric determination of trace elements in rare-earth compounds by rotating electrode (1970)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 251 (1970), S. 7-11 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A direct-reading emission-spectrometric method was applied in the presence of methanol for the quantitative determination of traces of rare earths and diverse other elements in rare-earth compounds by the rotating electrode. Addition of alcohols with lower boiling points than water causes an increase of the rate of vaporization of the sample solution and of the emission intensity. Methanol enhances the emission intensity to a larger extent than other alcohols and permits the determination of microquantities of the elements within limits of detection from 1 to 37 ppm in high-purity rare-earth compounds. The intensity ratio of the ionic line to the atomic line increases in the presence of more than 60% methanol, indicating the elevation of plasma temperature.
    Notes: Zusammenfassung Durch Zusatz von Alkoholen mit niedrigeren Siedepunkten als Wasser wird die Verdampfungsgeschwindigkeit der Lösung erhöht und die Linienintensität gesteigert. Methanol zeigt diese Wirkung in größerem Maße als andere Alkohole und ermöglicht die Bestimmung von Spuren Seltener Erden und anderer Elemente in Selten-Erd-Verbindungen hoher Reinheit mit Nachweisgrenzen von 1–37 ppm. Bei Gegenwart von mehr als 60% Methanol wird das Intensitätsverhältnis der Ionen- zur Atomlinie vergrößert, was auf eine Erhöhung der Plasmatemperatur zurückgeführt wird.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00430465
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Emission-spectrometric determination of trace rare-earth elements in yttrium oxide using CsCL-graphite buffer (1971)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 255 (1971), S. 264-268 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary An emission-spectrometric method was applied in the presence of CsCl-graphite buffer for the quantitative determination of traces of rare earth elements in yttrium oxide. The buffer causes an increase of the evaporation rate of the sample and of the emission intensity. The temperature in the arc plasma is decreased, and the atoms and ions of rare earths distribute uniformly along the axis of the discharge gap. The CsCl-graphite buffer enhances the sensitivity and the precision of the analytical elements to a larger extent than other buffers and permits the determination of microquantities of 10 impurity elements within limits of detection from 1 to 20 ppm in high-purity yttrium oxide. The coefficients of variation are less than 20%.
    Notes: Zusammenfassung Durch den Zusatz des CsCl-Graphitpuffers werden Verdampfungsgeschwindigkeit und Emissionsintensität erhöht, die Temperatur im Bogenplasma herabgesetzt und eine gleichmäßige Verteilung der Atome und Ionen längs der Entladungsstrecke bewirkt. Empfindlichkeit und Genauigkeit der Bestimmung sind besser als bei Verwendung anderer Puffer. 10 Verunreinigungselemente können mit Nachweisgrenzen von 1–20 ppm in hochreinem Yttriumoxid bestimmt werden. Die Variationskoeffizienten liegen unter 20%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00424190
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Emission-spectrometric determination of trace non-rare earth elements in yttrium oxide using AgF-Ga2O3 mixed carrier (1971)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 255 (1971), S. 103-109 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary An emission-spectrometric method is described for the quantitative determination of traces of non-rare earth elements in yttrium oxide, employing addition of AgF-Ga2O3 mixed carrier. This addition effects an increase of the rate of evaporation of the analytical elements and of the number of atoms in the arc plasma. It enhances the sensitivity of the analytical elements to a larger extent than other carriers and permits the determination of microquantities of the elements (Mg, Ca, Mn, Co, Fe, Pb, Cu, Cd, Al, B, Sn, As, Bi) within limits of detection from 0.1 to 13 ppm in high-purity yttrium oxide. The coefficients of variation are less than 20%.
    Notes: Zusammenfassung Das Trägergemisch bewirkt eine Erhöhung der Verdampfungsgeschwindigkeit der zu bestimmenden Elemente und der Anzahl der Atome im Bogenplasma. Es verbessert mehr als andere Träger die Empfindlichkeit und ermöglicht die Bestimmung von Mikromengen der Elemente (Mg, Ca, Mn, Co, Fe, Pb, Cu, Cd, Al, B, Sn, As, Bi) in hochreinem Yttriumoxid mit Nachweisgrenzen von 0,1–13 ppm. Die Variationskoeffizienten liegen unter 20%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00424442
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    Paper (German National Licenses)
    Fulltext
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