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  • 1975-1979  (3)
  • 1975  (3)
  • 1
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The condensation of 3.4-dimethyl-3-pyrrolin-2-one with p-methyl-, p-chloro-benzaldehyde and ferrocenealdehyde yields theZ-andE-isomers of the corresponding condensates. Due to kinetic control theZ-isomers are obtained almost exclusively in this reaction. TheE-isomers of the two firstmentioned products can be produced by photochemical isomerization. The structures (tautomeric forms) and configurations of the isomers were established by the Lanthanide-induced-shift-technique and by evaluating the Nuclear-Overhauser-Effect.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 273 (1975), S. 368-373 
    ISSN: 1618-2650
    Keywords: Strukturanalyse mit Röntgenphotoelektronen-Spektroskopie und Augerelektronen-Spektroskopie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Nach einer Definition des Strukturbegriffs für die Anwendung der XPS und AES wird die XPS aus allgemeiner Sicht hinsichtlich ihrer Vor- und Nachteile erörtert. Die gebrachten Beispiele belegen den hohen Informationsgehalt der XPS-Spektren. Die AES wird ihrer geringen Bedeutung als Strukturbestimmungsmethode entsprechend nur kurz im Vergleich zur XPS behandelt. Da das Prinzip beider Methoden bereits in zahlreichen Büchern und Veröffentlichungen eine ausführliche Darstellung erfuhr, wurde hier bewußt auf eine Wiederholung verzichtet.
    Notes: Abstract Following a definition of the term structure for the application of XPS and AES a general discussion of XPS with regard to its advantages and disadvantages is given. Examples demonstrate the high information content of XPS spectra. According to its inferior importance as structure determination method AES is treated only briefly in comparison to XPS. Repetition is avoided as the principle of both methods has already been dealt with in detail in numerous books and publications.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary An electron microscopic survey of nuclear events and changes in the perinuclear cytoplasm during the generative phase ofAcetabularia is presented with details on late stages in the maturation of the primary nucleus, possible modes of formation of secondary nuclei, the mitosis of secondary nuclei, migration of secondary nuclei into the stalk and the cap, the fine structure of nuclei and perinuclear cytoplasm during cyst formation and gametogenesis as well as during gamete fusion and zygote formation.
    Type of Medium: Electronic Resource
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