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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 21 (1974), S. 285-297 
    ISSN: 1432-1106
    Keywords: Visual cortex ; Receptive fields ; Response specificity ; Electrophoresis ; Glutamate ; GABA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Changes of specific response properties of single neurones in area 17 of the cat's cortex were studied during electrophoretic administration of glutamate and gamma-aminobutyric acid (GABA). Most cells were excited by glutamate. The diameter of the cells' discharge field (ERF) was enlarged by less than 1° in most cells, and the amplitude of the response within the ERF was increased. There was a weak correlation between the original size of the ERF and its enlargement during glutamate. Stimuli presented in non-optimal orientations and moved in the non-optimal direction became also effective in eliciting an excitatory response. When glutamate “doses” sufficiently high to increase background activity were used, inhibitory regions of the receptive fields could be revealed. GABA decreased the excitability of the cells until the response was totally blocked. In some cases, glutamate also decreased the excitability of cells. Simultaneous recordings from two cells suggested that the inhibitory effect may be indirect through activation of nearby inhibitory neurones. It is pointed out that extracellular recording combined with electrophoretic administration of glutamate can reveal information about a cell's properties which can otherwise only be obtained with intracellular recordings. The functional implications of the results are discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 386 (1971), S. 340-344 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die Geschwindigkeit der Selbstzersetzung von Fe(OH)2 unter Luftausschluß wurde unter Zusatz von Cu(II) (0-6 Atom-%) bei 30 bis 50°C bestimmt. Das Maximum der Geschwindigkeit und ein Minimum der Aktivierungsenergie tritt bei 1% Cu/Fe auf. Dies wird zwei gleichzeitig wirksamen Einflüssen des Cu zugeschrieben: Erstens der Verzerrung des Koordinationskomplexes durch Cu2+, die die Strukturumwandlung in Magnetit erleichtert, dagegen wirkt negativ der Einfluß des Cu, der zur Vergrößerung der Fe(OH)2-Kristalle führt. Röntgenaufnahmen und elektronenmikroskopische Beobachtungen bestätigen die Annahme.
    Notes: The rate of self-decomposition of iron(II) hydroxide doped with various amounts (0-6 atomic%) of Cu(II) was determined in the absence of oxygen at the temperature range of 30 to 50°C. The maximum rate and the minimum activation energy were observed at 1% Cu/Fe. The result was attributed to the two simultaneous actions of Cu2+, i.e., the distortion effect on coordination complex of Fe2+ by Cu2+ to ease the structural transformation to magnetite and the hindering effect on magnetite formation revealed consequently in the growth of Fe(OH)2 crystals. Both effects were proved by X-ray diffraction and election-microscopic observations.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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