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  • 1
    Electronic Resource
    Electronic Resource
    Further contribution to the study of corticostriatal glutamatergic and nigrostriatal dopaminergic interactions within the striatal network: an in vivo voltammetric investigation (1992)
    Springer
    Amino acids 3 (1992), S. 53-68 
    Details
    ISSN: 1438-2199
    Keywords: Amino acids ; Excitatory amino-acid ; NMDA ; Dopamine ; Striatum ; In vivo voltammetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In vivo voltammetry was used in freely moving rats to study the processes whereby striatal dopamine (DA) release is regulated by corticostriatal glutamatergic neurons. Electrical stimulation of the cerebral cortex was found to markedly increase the striatal DA-related voltammetric signal amplitude. Similar enhancements have been observed after intracerebroventricular administration of 10nmoles glutamate, quisqualate and AMPA, whereas NMDA was found to decrease the amplitude of the striatal signals. The NMDA receptor antagonist APV did not significantly affect the voltammetric signal but prevented the NMDA-induced depression of the DA-related signals. These data are in agreement with those obtained in numerous previous studies suggesting that the glutamatergic corticostriatal neurons exert activatory effects on the striatal DA release via non-NMDA receptors. The mechanism involved might be of a presynaptic nature. The role of the NMDA receptors may however consist of modulating the dopaminergic transmission phasically and in a depressive way, which would be consistent with behavioural data suggesting the existence of a functional antagonism between the activity of the corticostriatal glutamatergic and nigrostriatal dopaminergic systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806008
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of antibiotic treatments onAzolla-Anabaena andArthrobacter (1991)
    Springer
    Plant and soil 137 (1991), S. 151-155 
    Details
    ISSN: 1573-5036
    Keywords: Anabaena ; Arthrobacter ; Azolla ; erythromycin ; novobiocin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The leaf cavities and the sporocarps of the water fernAzolla contain bacteria belonging to the genusArthrobacter Conn and Dimmick. The number of these bacteria can be decreased by treating the plants with novobiocin and erythromycin. The latter antibiotic kills theAnabaena, soAnabaena free plants can be obtained. In these plants the bacteria disappear almost completely. The novobiocin does not affect the heterocyst differentiation, but it decreases the N2-fixation activity by affecting the synthesis of the dinitrogenase reductase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02187447
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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