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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Chromatography B: Biomedical Sciences and Applications 222 (1981), S. 13-22 
    ISSN: 0378-4347
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In the hippocampus of patients with therapy-refractory temporal lobe epilepsy, glial cells of area CA1 might be less able to take up potassium ions via barium-sensitive inwardly rectifying and voltage-independent potassium channels. Using ion-selective microelectrodes we investigated the effects of barium on rises in [K+]o induced by repetitive alvear stimulation in slices from surgically removed hippocampi with and without Ammon's horn sclerosis (AHS and non-AHS). In non-AHS tissue, barium augmented rises in [K+]o by 147% and prolonged the half time of recovery by 90%. The barium effect was reversible, concentration dependent, and persisted in the presence of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionate (AMPA), N-methyl-d-aspartate (NMDA) and γ-aminobutyric acid [GABA(A)] receptor antagonists. In AHS tissue, barium caused a decrease in the baseline level of [K+]o. In contrast to non-AHS slices, in AHS slices with intact synaptic transmission, barium had no effect on the stimulus-induced rises of [K+]o, and the half time of recovery from the rise was less prolonged (by 57%). Under conditions of blocked synaptic transmission, barium augmented stimulus-induced rises in [K+]o, but only by 40%. In both tissues, barium significantly reduced negative slow-field potentials following repetitive stimulation but did not alter the mean population spike amplitude. The findings suggest a significant contribution of glial barium-sensitive K+-channels to K+-buffering in non-AHS tissue and an impairment of glial barium-sensitive K+-uptake in AHS tissue.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 317 (1975), S. 1027-1034 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Autoxidation of Derivatives of NorbornenenNorbornene, bicyclo[2, 2, 1]2-heptene-5-carboxylic acid methyl ester, bicyclo-[2, 2, 1]2-heptene-5-carbonitril, 5-methylbicyclo[2, 2, 1]2-heptene-5-carboxylic acid methyl ester and dicyclopentadiene are easily oxidized by molecular oxygen; the corresponding exo-epoxides are formed as main products by attack on the norbornene double bond.
    Notes: Norbornen, Bicyclo[2, 2, 1]hepten-(2)-carbonsäure-(5)-methylester, Bicyclo[2, 2, 1]hepten-(2)-carbonsäure-(5)-nitril, 5-Methylbicyclo[2, 2, 1]hepten-(2)-carbonsäure-(5)-methylester und Dicyclopentadien werden von molekularem Sauerstoff leicht oxydiert; als Hauptprodukte bilden sich unter Angriff auf die Norbornendoppelbildung die entsprechenden exo-Epoxide.
    Type of Medium: Electronic Resource
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