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  • 1
    ISSN: 1432-1459
    Keywords: Spinal arteriovenous malformation (AVM) ; Vascular myelopathy ; Lower motor neuron lesion ; Sensory transverse lesion ; Electromyography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Twenty-six patients with myelographic signs suggestive of a spinal arteriovenous malformation (AVM) were examined neurologically and neurophysiologically. By selective spinal angiography it was possible to differentiate between dural arteriovenous fistulae (dAVF 20 patients) and intradural AVMs (iAVM, 6 patients). Initial complaints were nonspecific and variable, mainly consisting of sensory disorders and muscle weakness. Later, patients suffered involvement of both the upper and lower motor neurons. There was a high percentage of lower motor neuron lesions (95%), especially in dAVF patients, which were mostly of widespread distribution and included several myotomes. Electrophysiological examination regularly revealed lower neuron involvement, frequently with pathological spontaneous activity in several myotomes, pathological sensory-evoked potentials after tibial nerve stimulation, but normal sensory conduction velocities of the sural nerve, indicating sparing of the sensory ganglion. Frequently there was a discrepancy between the localization of the dural fistula or angioma and the spinal level responsible for clinical symptoms. This suggests that it may be the inadequacy of the venous drainage system to cope with the blood volume rather than the AV-shunt that is responsible for the symptoms. An early diagnosis is essential, as removal of the shunt before there has been progression to severe neurological deficits (paraplegia) is the only way to ensure a satisfactory outcome.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Alkynones with Nucleophilic Reagents such as 1,2-Diaminobenzene, 2-Aminomercaptobenzene and N1-Disubstituted HydrazinesThe aromatic 1,2-diamines 1 and 4 or the 2-aminomercaptobenzene react with alkynones 2, depending on their substituents, by addition to the triple bond, giving 6 and 7, or by cyclization leading to 1,5-benzodiazepines 3 and 5, or 1,5-benzothiazepines 8.
    Notes: 1.2-Diamine vom Typ des o-Phenylendiamins (1, 4) oder o-Amino-thiophenol reagieren mit den Acetylenketonen 2 je nach deren Substitution unter Addition an die Dreifachbindung zu 6 bzw. 7 oder Ringschluß zu 1.5-Benzodiazepinen (3, 5) bzw. 1.5-Benzothiazepinen (8).
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 757 (1972), S. 153-169 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyclisation Reactions of Alkynones with Double CH-Acid Compounds to PhenolsAlkynones 1 and CH-acid compounds like dibenzyl ketone react to substituted phenols 4 in the presence of K-tert-butylate. Depending on the substituents, 2,3,5,6-tetrasubstituted phenols are oxidized by CrO3/acetic acid to benzoquinones 11a-f or fluorene quinones 9 and 10 In a solution of HBr/acetic acid phenols of the type of 4a or 4f form fluorenols like 12 or phthalanes like 13.
    Notes: Acetylenketone 1 und CH-acide Verbindungen von der Art des Dibenzylketons reagieren in Gegenwart von K-tert.-butylat zu substituierten Phenolen 4. 2.3.5.6-Tetrasubstituierte Phenole werden mit CrO3/Eisessig je nach Substitution zu Benzochinonen 11a-f bzw. zu Fluorenchinonen 9 und 10 oxydiert. In HBr/Eisessig reagieren Phenole vom Typ 4a bzw. 4f zu Fluorenolen, wie 12, bzw. zu Phthalanen, wie 13.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Substituted 2,3-Dihydrofurans and 3,4-Dihydro-2H-1,4-benzoxazines as Result of Intramolecular Ring-Closures with Diphenylmethylcarbonium Ions1-Methoxy-1,1,4-triphenyl-2-butyn-4-one adds deoxybenzoin and 2-aminophenol to the triple bond. Under acid conditions the products react with their methoxydiphenylmethyl group to give derivatives of 2,3-dihydrofuran or 3,4-dihydro-2H-1,4-benzoxazine.
    Notes: 1-Methoxy-1,1,4-triphenyl-2-butin-4-on bildet mit Desoxybenzoin und 2-Aminophenol an der Dreifachbindung Additionsprodukte. Diese reagieren unter sauren Bedingungen mit ihrer Methoxy-diphenylmethyl-Gruppe zu Derivaten des 2,3-Dihydrofurans oder 3,4-Dihydro-2H-1,4-benzoxazins.
    Type of Medium: Electronic Resource
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