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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Inventiones mathematicae 11 (1970), S. 319-328 
    ISSN: 1432-1297
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 47 (1960), S. 446-447 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 48 (1961), S. 623-623 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 49 (1962), S. 183-184 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
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  • 15
    Electronic Resource
    Electronic Resource
    Springer
    Zoomorphology 36 (1940), S. 745-811 
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
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  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 204 (1964), S. 325-331 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Glass electrodes have been prepared from a sodium-alumina-silica glass of the synthesis composition (mole %) of 27% Na2O, 8% Al2O3, 65% SiO2 (NAS 27-8) and their suitability for the indication of the potassium titration by means of Zn[SiF6] in methanolic solution has been studied. With pure potassium salt solutions of low acidity it is possible to obtain well definable titration curves. With strongly acid solutions the glass electrode fails. Apart from ions forming sparingly soluble salts with hexafluorosilicate also Ca2+, Mg2+, and Al3+ are interfering by reaction with the fluoride ions present in equilibrium.
    Notes: Zusammenfassung Aus einem Natriumaluminiumsilicat-Glas mit der Synthese-Zusammensetzung (Mol-%) 27% Na2O, 8% Al2O3 und 65% SiO2 (NAS 27-8) wurden Glaselektroden hergestellt, deren Eignung zur Indizierung der Kaliumtitration mit Zn[SiF6] in methanoliseher Lösung untersucht wurde. In reinen, schwach sauren Kaliumsalzlösungen erhält man gut auswertbare Titrationskurven. Die Glaselektrode versagt in stark saurer Lösung. Außer den Ionen, die mit Hexafluorosilicat schwerlösliche Salze bilden, stören auch Ca2+, Mg2+ und Al3+, die mit den im Gleichgewicht vorliegenden Fluoridionen reagieren.
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  • 17
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 201 (1964), S. 1-8 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The polarographic behaviour of SbIII, SnIV, and AsIII in 0.1 M ammonium oxalate-0,1 M oxalic acid solution has been studied for the single elements and for mixtures. SbIII and SnIV yield well-defined waves in this supporting electrolyte and can be determined in presence of each other. With a mixture of all the three elements a three wave polarogram is obtained, which can be evaluated with the usual polarographic accuracy for SbIII only, whereas the accuracy for SnIV and AsIII is low. Better results have been obtained by derivative polarography. In the derivative polarogram, with three current maxima, the peak current of antimony shows linear, that of tin and arsenic logarithmic proportionality to the concentration.
    Notes: Zusammenfassung Es wurde das Verhalten von SbIII, SnIV und AsIII in 0,1 m Ammoniumoxalat-0,1 m Oxalsäure einzeln und in Kombinationen untersucht. SbIII und SnIV geben in dieser Grundlösung gut ausgebildete Stufen und lassen sich nebeneinander bestimmen. Tritt noch AsIII hinzu, erhält man ein dreistufiges Polarogramm, dessen quantitative Auswertung lediglich für SbIII mit der üblichen polarographischen Genauigkeit möglich ist; SnIV und AsIII können dagegen nur mit geringer Genauigkeit erfaßt werden. Bessere Werte wurden auf derivativ-polarographischem Wege erhalten. Im Derivativpolarogramm, drei Strommaxima aufweisend, ist der Spitzenstrom des Antimons linear der des Zinns und Arsens logarithmisch proportional zur Konzentration.
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  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 200 (1964), S. 411-418 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Information on the vaporisation form of an element may be obtained by means of thermodynamic approximations. Considerations of such kind prove to be convenient for dimensioning the electrode sizes as well as for making predictions on interference effects and their elimination. The efficiency of a buffer may be evaluated from the voltage between the electrodes (burning voltage) of the arc. An optimum buffer efficiency results in such cases, where the burning voltages of sample and buffer are similar to each other.
    Notes: Zusammenfassung Über die Verdampfungsform eines Elementes kann man mittels thermodynamischer Näherungsrechnungen Aussagen erhalten. Derartige Betrachtungen erweisen sich als günstig für die Dimensionierung der Elektrodenabmessungen und für die Voraussage auf Störeffekte bzw. für deren Beseitigung. Die Wirksamkeit eines Puffers läßt sich aus der Brennspannung des Bogens beurteilen. Eine optimale Pufferwirkung ergibt sich, wenn die Brennspannungen von Probe und Puffer einander ähnlich sind.
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  • 19
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 200 (1964), S. 326-331 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The electrode functions of a glass, containing (mol-%) 27% Na2O, 8% Al2O3, and 65% SiO2, have been tested against different cations. Such a glass electrode exhibits a distinct silver function and can be applied as indicator electrode to the precipitation titration of silver ion with halogenide in neutral medium. Magnesium chloride proved to be the most favourable titrator, yielding clear jumps in potential at the equivalence point. The indication is not influenced by divalent cations, larger amounts of alkali ions, however, interfere.
    Notes: Zusammenfassung Die Elektrodenfunktionen eines Glases, bestehend aus (Mol-%) 27% Na2O, 8% Al2O3 und 65% SiO2, wurden gegenüber verschiedenen Kationen geprüft. Die Glaselektrode zeigt eine ausgeprägte Silberfunktion und läßt sich als Indicatorelektrode bei der Fällungstitration des Silberions mit Halogenid im neutralen Medium einsetzen. Als günstigster Titrator erwies sich Magnesiumchlorid, das zu einem deutlichen Potentialsprung im Äquivalenzpunkt führt. Zweiwertige Kationen beeinflussen die Indizierung nicht, wohl aber stören größere Mengen an Alkaliionen.
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  • 20
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Synopsis Cytophotometry of Feulgen-Schiff stained mouse liver cell nuclei revealed DNA that is resistant to prolonged alkaline hydrolysis (5 hr or more at 37°C) with ethanolic barium hydroxide. Thus, in aldehyde-fixed tissue sections an interval of confidence exists between the complete degradation of RNA and the beginning of the extraction of DNA.
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