GLORIA

GEOMAR Library Ocean Research Information Access

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Organic Chemistry  (11)
  • Succinic dehydrogenase  (1)
  • 1965-1969  (12)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Anatomy and embryology 128 (1969), S. 141-162 
    ISSN: 1432-0568
    Keywords: Salivary glands ; Succinic dehydrogenase ; Alkaline phosphatase ; Gl. lacrimalis (extraorbitalis) ; Salivary reabsorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei der Ratte wurden die Ausführungsgangsysteme der drei großen Speicheldrüsen und der Gl. lacrimalis extraorbitalis hinsichtlich des Gehaltes ihrer Epithelien an Succinodehydrogenase sowie in bezug auf die Art und Dichte ihrer Kapillarisierung untersucht. Die Drüsengefäße (Capillaren) stellten wir durch die Reaktion der Endothelzellen auf alkalische Phosphatase dar. Bei den Speichelgangsystemen fand sich jeweils der höchste Gehalt an Succinodehydrogenase in den Epithelien der intralobulären Ganganteile. Generell nahm mit zunehmender Ganggröße die Reaktionsstärke ab. Das Gangsystem der Gl. retrolingualis fiel durch einen besonders hohen Enzymgehalt auf. Bei der Gl. lacrimalis extraorbialis war — beschränkt auf die extraglandulären Ganganteile — nur eine schwach positive bis negative Reaktion zu erzielen. Bei den Speicheldrüsen zeigten sich an allen Anteilen der Gangsysteme Capillarnetze; bei der Tränendrüse waren solche nur an den außerhalb des Drüsenkörpers liegenden Gangabschnitten zu beobachten. So wie der Gehalt an Succinodehydrogenase nahm auch die Kapillarisationsdichte an den Ausführungsgangsystemen der untersuchten Speicheldrüsen im Verlauf der Gänge nach peripher ab. Die unterschiedliche Dichte der Capillarnetze an den Gangsystemen der drei großen Rattenspeicheldrüsen läßt auf unterschiedlich starke Austauschvorgänge schließen. Die auf Mikropunktionsuntersuchungen beruhende Annahme, daß der Ductus submandibularis noch zu einer Veränderung des ihn passierenden Sekretes beiträgt, wird morphologisch durch den Nachweis enggestellter Capillarnetze und histochemisch durch eine stark positive Reaktion der Gangepithelien auf Succinodehydrogenase gestützt. Für den Ductus retrolingualis gelten ähnliche Überlegungen, obwohl noch keine Mikropunktionsuntersuchungen vorliegen. Beim Ductus parotideus dagegen bestätigen der weitmaschige Capillarplexus und der geringe Gehalt der Gangepithelien an Succinodehydrogenase die Auffassung früherer Untersucher, daß der Parotisgang (und seine extraglandulären Zuflüsse) keinen wesentlichen Einfluß mehr auf die Zusammensetzung des Endspeichels ausübt.
    Notes: Summary The duct systems of the great salivary glands and the gl. lacrimalis extraorbitalis of the rat have been examined with respect to their activity of succinic dehydrogenase, as well as with respect to the appearance and density of their capillarisation. The blood vessels (capillaries) have been demonstrated by means of the reaction of their endothelium to alkaline phosphatase. The highest activity of succinic dehydrogenase has been found in the epithelial cells of the intralobular ducts (of the salivary glands). Generally decreasing activity was observed in the ducts with enlargening diameter. In the ducts of the gl. retrolingualis, the enzyme reaction is particularly strong. The duct system of the gl. lacrimalis extraorbitalis has a weak positive to negative reaction in its outer-glandular part. On all parts of the salivary duct systems there is a capillary network. In the lacrimal gland, however only the outerglandular part of the duct system is characterized by the capillary network. The capillary network of the salivary duct systems are seen to become wider as the diameter of the ducts becomes greater. The different density of the networks surrounding the salivary duct systems probably indicate exchange processes of varying intensity. The theory that the ductus submandibularis may alter the composition of the passing saliva is supported by the finding of a dense capillary network and high activity of succinic dehydrogenase in the ducts. The same features are found in the ductus retrolingualis, although here the theory of alteration of saliva by the ducts is not yet proved by micropuncture experiments. The assumption of preceding investiations that the function of the ductus parotideus does almost completely consist in transporting the saliva, is supported by a wide-spread capillary network and by a minute activity of succinic dehydrogenase of the duct cells.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The possibility of elimination reactions without participation of the positive charge and/or electron deficient centers, in particular the loss of RCOOH, was investigated for molecular and fragment ions. Such processes, which could be referred to as quasithermal or quasi-photochemical reactions, were found to be absent or insignificant.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 49 (1966), S. 946-964 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Das aus Alstonia macrophylla Wall. (A pocynaceae) isolierte «dimere» Indolalkaloid Macralstonin lässt sich durch verdünnte Salzsäure in die Villalstonin-Spaltbase Macrolin (8) und das ebenfalls aus Alstonia macrophylla isolierte Alkaloid Alstophyllin (2) spalten. Daraus und auf Grund spektroskopischer Untersuchungen (UV.-, IR.-, NMR.-, Massenspektren) wird für Macralstonin die Struktur 1 abgeleitet.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 48 (1965), S. 674-689 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurde das Verhalten quartärer Alkaloidsalze im Massenspektrometer untersucht. Dabei fanden sich drei prinzipiell verschiedene Verhaltensweisen: 1Angriff des Anions an der N(b)-Methylgruppe unter Bildung des tertiären Amins (Demethylierungsbase)und des Methylhalogenids.2Thermischer HOFMANN-Abbau unter Bildung eines ungesättigten Amins (HOFMANN-Base) und des Halogenwasserstoffs.3Angriff des Anions an einem der drei anderen N(b)-Substituenten unter Bildung eines tertiären Amins und Eintritt des Halogenatoms in dieses (Substitution).
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 48 (1965), S. 729-750 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: La structure chimique, ainsi que la configuration de deux phytotoxines isolées d'Aspergillus flavus oryzae: les aspergillomarasmines A (XXVI) et B (VII) (cette dernière étant identique à l'acide lycomarasmique) sont établies.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 50 (1967), S. 364-376 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Pyridoxine and pyridoxal are suitable for gas-chromatographic analysis after conversion into their trimethylsilyl derivatives. Silylation proceeds rapidly and quantitatively, pyridoxal reacting in its hemiacetal form. The mass spectra of both derivatives are discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 50 (1967), S. 1866-1879 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The trimethylsilyl ethers of reduced vitamins K1, K2, and of phytylubiquinone were investigated by means of gas chromatography and mass spectrometry.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 52 (1969), S. 1-14 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Trimethylsilyl-enolethers of 5α- and 5β-cholestan-3-on were investigated by gas chromatography and mass spectrometry. These derivatives are readily prepared and well suited for gas chromatographic analysis. In the mass spectrum they show fairly intense fragmentation, which appears to be characteristic for some structural elements in the surroundings of the functional group (excluding stereochemistry). This fragmentation may be useful for the structure elucidation of 3-oxo-steroids and related compounds.For comparison purposes the corresponding enolacetates were also investigated.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Vitamin A and some of its isomers are separated and quantitatively determined as trimethylsilylethers by gas liquid chromatography. The identity of the different fractions is proved by mass spectrometry.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Stereospecific cyclizations of (3′R, 7′R, 11′R)-α-tocopherolquinone (2) are reported:Treatment with conc. sulfuric acid in methanol at 0-5° gave (2R, 4′R, 8′R)-α-tocopherol (1a) with complete retention of configuration at C-3′.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...