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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 162 (1948), S. 732-733 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THERE has been much controversy about our claim1 that D-glutamic acid is a constituent of tumour proteins. Many authors were unable to confirm our results, and in their opinion the D-form which we isolated from malignant tumours Was formed by partial racemization in vitro during ...
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 63 (1960), S. 558-568 
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Aufnahme von radioaktivem Phosphat durch die Phosphatide des Benzpyren-Sarkoms der Ratte, des Brown-Pearce-Carcinoms des Kaninchens und des Ehrlich-Ascites-Carcinoms der Maus wurde in vitro untersucht und mit der Phosphat-Aufnahme einiger normaler Gewebe tumortragender und gesunder Tiere verglichen. Trotz verhältnismäßig geringen Phosphatidgehalts der untersuchten Tumoren war die Aufnahme von radioaktivem Phosphat durch die Tumorphosphatide hoch. Die papierchromatographische Trennung der vorher durch Säulen-Chromatographie isolierten Komponenten sowie der durch Hydrolyse der extrahierten Lipide gewonnen Produkte zeigte, daß die Isotopen bei den Benzpyren- und Brown-Pearce-Tumoren vorwiegend in die Lecithine eingelagert wurden. Bei den Ehrlich-Ascites-Carcinomen fand sich das Isotop in etwa gleichen Mengen in der Lecithin- und in der Phosphatidyl-Äthanolamin-(Cephalin-)Fraktion. Gleichzeitig erwies sich Inositol als eine der Komponenten der Tumorphosphatide. Dagegen konnte ein sperminhaltiges Phosphatid (“Maligno-Lipin”) in den untersuchten Tumoren nicht nachgewiesen werden. Die Untersuchung verschiedener Zellfraktionen ergab einen hohen Prozentsatz von Phosphatiden in der Mikrosomenfraktion der Tumorzellen. Das gleiche gilt für die normale Rattenleber. Eine möglicherweise strukturelle Funktion der Tumorphosphatide wird diskutiert.
    Notes: Summary A study was made of the in vitro incorporation of radioactive phosphate into the phosphatides of the benzpyrene sarcoma of the rat, of the Brown-Pearce carcinoma of rabbits, Ehrlich mouse ascites carcinoma and of some normal tissues of tumour-bearing and comparable healthy animals. Whereas the phosphatide content of the studied tumours was relatively low, the incorporation of radioactive phosphate in the tumour phosphatides proved to be high. Paperchromatographic separation of the components, previously purified by column chromatography, and of the products obtained by hydrolysis of the extracted lipids demonstrated that during the in vitro incubation of benzpyrene and Brown-Pearce tumours the isotope was incorporated mainly into the lecithins. In Ehrlichascites cells the isotope was recovered in about equal amounts in the lecithin and phosphatidyl-ethanolamine (cephalin) fractions. At the same time inositol was shown also to be one of the components of the tumour phosphatides. No evidence was obtained of the occurrence of a spermine containing phosphatide (“maligno-lipin”) in the studied tumours. A study of the various cell fractions demonstrated a high percentage of phosphatides to be present in the microsomal fractions of the tumour cells. This is also true for the normal rat liver. A structural function of the phosphatides in tumours is discussed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 47 (1960), S. 90-90 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 27 (1939), S. 486-487 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 31 (1943), S. 208-208 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 144 (1939), S. 111-111 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In analysing tumour proteins, we1have isolated without exception partially racemized glutamic acid. However, Chibnall and co-workers2 recently reported the isolation of optically pure l(+)-glutamic acid in four cases. These authors did not use the same method which ...
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 5 (1949), S. 173-180 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 13 (1957), S. 138-139 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Using ethyl α-iodopropionate (I) and diethyl malate (II) or ethyl lactate (III) and diethyl maleate (IV) as starting materials, the furanone derivatives VI and VIIb have been prepared. The latter has been converted into a mixture (XVI) of muscarin and its stereoisomers by various methods summarized in the formulae.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 13 (1957), S. 137-138 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A recent investigation ofKögl, Salemink, Schouten andJellinek established the constitution of muscarin as the quaternary trimethyl-ammonium salt of 2-methyl-3-hydroxy-5- (amino - methyl) - tetrahydrofuran. Moreover the X-ray analysis elucidated the complete stereochemical configuration of the alkaloid. There are various possibilities for a synthetic approach. The present communication gives a preliminary description of a synthesis which started fromα-acetyl-δ-chloro-γ-valerolactone, leading to a mixture of muscarin and its stereochemical isomers. The synthetic product gives the same R F -value and a very similar infrared spectrum. The pharmacological activity on the frog heart is about one third of that of the natural alkaloid.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 8 (1929), S. 1872-1874 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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