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  • 1960-1964  (8)
  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 197 (1963), S. 452-454 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN normal mouse haematopoietic tissue, there is a class of cells which, on being transplanted into heavily irradiated mice, can proliferate and form macroscopic colonies. In the spleen, the colonies formed in this manner are discrete and easy to count1"2. Microscopically, each colony appears as a ...
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 204 (1964), S. 427-433 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A sensitive fluorimetric procedure for the determination of ethinyloestradiol is described. It uses the fluorescence obtained by the reaction of the steroid with anhydrous aluminium chloride. The optimum conditions have been determined by studying the rates of formation and decomposition of the fluorescing compounds. At a concentration of 2 μg/ml the relative standard deviation has been found to be 4%.
    Notes: Zusammenfassung Es wird eine empfindliche Methode zur quantitativen fluorimetrischen Bestimmung von Äthinyloestradiol beschrieben. Sie basiert auf der Fluorescenz, die entsteht, wenn Äthinyloestradiol mit wasserfreiem Aluminiumchlorid umgesetzt wird. Die optimalen Arbeitsbedingungen wurden auf Grund der Bildungs- und Zerfallsgeschwindigkeiten der fluorescierenden Verbindungen ermittelt. Bei einer Konzentration von 2 μg/ml wurde eine relative Standardabweichung des Verfahrens von 4% gefunden.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 174 (1960), S. 161-169 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A special type of paper chromatography is described and is named elatography. The substances to be identified are reacted with a suitable compound on the paper either before or during the elution of the chromatogram. The main characteristic of the method is that there are always reaction products which are separated and identified. The distance travelled by the front of the mobile phase can be essentially shortened by this procedure. The result is a great economy of time.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 183 (1961), S. 356-361 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Anhydrous aluminium chloride gives colour reactions with many organic compounds in organic solvents (especially in nitrohydrocarbons). Such reactions were studied principally with steroid hormones. Interesting specific methods for their detection resulted. Correlations between the structure of the organic compound and the colour reaction are indicated.
    Notes: Zusammenfassung Wasserfreies Aluminiumchlorid reagiert in organischer Lösung (besonders nitrierte Kohlenwasserstoffe sind geeignet) mit vielen organischen Verbindungen unter Bildung von gefärbten Produkten. Besonders eingehend wurden die entsprechenden Reaktionen bei den Steroidhormonen untersucht, wo sich interessante spezifische Nachweismethoden ergeben. Es wird auf die Zusammenhänge zwischen Struktur der organischen Verbindung und Farbbildung hingewiesen.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 187 (1962), S. 110-114 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The use of “elatography” for the separation and semi-quantitative determination of Merthiolate and other mercury compounds is described. Dithizone is applied as reagent. Different kinds of complexes are formed between dithizone and the compounds studied.
    Notes: Zusammenfassung Die Anwendung der „Elatographie“ zur Trennung und halbquantitativen Bestimmung von Merthiolate neben anderen Quecksilberverbindungen wird beschrieben. Als Reagens dient Dithizon. Es bilden sich verschiedenartige Komplexe zwischen dem Dithizon und den untersuchten Verbindungen.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 198 (1963), S. 344-347 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The „elatographic“ technique is used for the identification and half-quantitative determination of organic substances, which produce coloured complexes with iron(III)-chloride.
    Notes: Zusammenfassung Die Anwendung der „Elatographie“ zur Identifizierung und halbquantitativen Bestimmung organischer, mit Eisen(III)-chlorid farbige Komplexe bildender Substanzen wird beschrieben.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 198 (1963), S. 162-170 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A new method for the quantitative spectrophotometric determination of ethinylestradiol is described. It is based on the colour reaction of the steroid with anhydrous aluminium chloride in nitromethane and is specific in relation to decomposition products. An example for the determination of ethinylestradiol in tablets is shown.
    Notes: Zusammenfassung Es wird eine neue Methode zur quantitativen spektrophotometrischen Bestimmung von Äthinyloestradiol beschrieben. Sie basiert auf der Farbreaktion des Steroids mit wasserfreiem Aluminiumchlorid in Nitromethan und ist spezifisch in bezug auf Zersetzungsprodukte. Ein Beispiel für die Bestimmung von Äthinyloestradiol in Tabletten wird angeführt.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 199 (1964), S. 414-419 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary For the determination of quaternary ammonium compounds, the spectrophotometry of the dithizonates is proposed. The method is compared with an analytical procedure based on the separation of eosin complexes by means of adsorption chromatography. The dithizone method requires considerably less time.
    Notes: Zusammenfassung Zur Bestimmung quartärer Ammoniumverbindungen wird die Colorimetrie der Dithizonate vorgeschlagen. Die Methode wird verglichen mit einem Analysenverfahren, das auf der Isolierung der Eosinkomplexe durch Adsorptionschromatographie beruht. Die Dithizonmethode erfordert weit geringeren Zeitaufwand.
    Type of Medium: Electronic Resource
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