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  • 1
    Electronic Resource
    Electronic Resource
    Infrared stimulated Raman generation: Effects of gain focussing on threshold and tuning behaviour (1975)
    Springer
    Applied physics 8 (1975), S. 333-340 
    Details
    ISSN: 1432-0630
    Keywords: Tunable lasers ; Infrared ; Stimulated Raman effect ; Gain focussing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract It is shown that for generation of infrared radiation by stimulated Raman scattering, the diffraction spread of the Stokes wave can have a significant effect on the threshold. Compared with an analysis in which gain focussing is neglected, the threshold powers may be much higher with a corresponding reduction in tuning range. The design of a Raman oscillator is considerably influenced by these diffraction effects, and also it is found that the Stokes wave is subject to frequency-pulling which is dependent on the pump power.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00898367
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  • 2
    Electronic Resource
    Electronic Resource
    Release of [3H]Dopamine from Striatal and Cerebral Cortical Slices from Rats with Thioacetamide-Induced Hepatic Encephalopathy: Different Responses to Stimulation by Potassium Ions and Agonists of Ionotropic Glutamate Receptors (1997)
    Springer
    Neurochemical research 22 (1997), S. 101-106 
    Details
    ISSN: 1573-6903
    Keywords: Hepatic encephalopathy ; brain slices ; striatum ; frontal cortex ; glutamate receptors ; dopamine release
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effects of depolarizing stimuli; high (50 mM) potassium ions and the glutamate receptor agonists N-methyl-D-aspartate, kainate and 2-amino-3-hydroxy-5-methyl-4-isoxazolepropionate (AMPA) on the release of newly-loaded [3H]dopamine were studied in frontal cortical and striatal slices from control rats and from rats with acute hepatic encephalopathy induced with a hepatotoxin, thioacetamide. Hepatic encephalopathy enhanced the stimulatory effect of potassium ions by 20% in striatal slices and by 34% in frontal cortical slices. In striatal slices the stimulatory effects of N-methyl-D-aspartate and kainate were depressed in hepatic encephalopathy by 46% and 21%, respectively, which may be taken to reflect impaired modulation of striatal dopamine release by glutamate acting at N-methyl-D-aspartate or kainate receptors. In frontal cortical slices, the stimulatory effect of kainate was enhanced by 35% in hepatic encephalopathy but N-methyl-D-aspartate-stimulated release was not affected. The release evoked by 2-amino-3-hydroxy-5-methyl-4-isoxazolepropionate was not affected in hepatic encephalopathy in either brain region. Stimulation of dopamine release in the frontal cortex by depolarization or glutamate acting at kainate receptors could inhibit the activity of descending corticostriatal glutamatergic pathways, further impairing regulation of dopamine release by glutamate in the stratum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1027347019707
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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