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  • 1990-1994  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Fast and Local Electrochemical Monitoring of Noradrenaline Release from Sympathetic Terminals in Isolated Rat Tail Artery (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 60 (1993), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Noradrenaline release from sympathetic nerve terminals was evoked by electrical nerve stimulation of an isolated segment of rat tail artery. This release was recorded by a carbon fiber electrode combined with differential pulse amperometry. The active part of the electrode (one carbon fiber 8 μm in diameter and 50 μm in length) was placed in close contact with the arterial surface. The oxidation current appearing at +120 mV and corresponding to the local noradrenaline concentration at the electrode surface was recorded every 0.5 s. No oxidation current was detected under resting conditions, but electrical stimulation evoked an immediate increase in this current. This response was suppressed when tetrodotoxin was added to the perfusion medium and was enhanced when noradrenaline reuptake was inhibited by cocaine. The amplitude of the response was increased with increasing stimulation frequencies (2–25 Hz) and train lengths (1–16 pulses). Finally, the time resolution of the method (0.5 s) was good enough to show that noradrenaline release precedes the postsynaptic response, i.e., the electrically evoked contraction of the artery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1993.tb03284.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The role of condensation and heat conduction in the formation of prominences: An MHD simulation (1990)
    Springer
    Solar physics 125 (1990), S. 277-293 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we investigate the effects of condensation and thermal conduction on the formation of Kippenhahn-Schlüter (K-S) type prominences in quiet regions (QP) due to symmetric mass injection. To implement this investigation, a self-consistent, two-dimensional, non-planar, time-dependent magneto-hydrodynamic (MHD) simulation model is developed. In the model, we use various values of the injection velocity, density, and magnetic field strength to determine the most favorable conditions for the QP formation. Based on these simulation results, we find that the formation of a K-S-type field configuration should be considered as a dynamic process, which needs both condensation and mass injection to supply enough mass to maintain such a configuration to complete the formation process of quiescent prominence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00158407
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Isolation and characterization of endogenous modulators for GABA system (1992)
    Springer
    Neurochemical research 17 (1992), S. 107-114 
    Details
    ISSN: 1573-6903
    Keywords: Endogenous inhibitors ; glutamate decarboxylase ; GABAA receptor ; GABA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Pig brain extracts from both soluble and membrane fractions were found to contain potent inhibitors for GABA synthesizing enzyme, GAD, referred to as endogenous GAD inhibitors (EGIs) and for the binding of GABA agonist, muscimol, referred to as muscimol binding inhibitors (MBIs). EGIs and MBIs were first purified through gel-filtration Bio-Gel P-2 columns, in which multiple activity peaks were observed. One of them appears to be co-eluted with eitherl-glutamate or GABA. However, others are clearly separated froml-glutamate or GABA. EGIs were found to be low MW (〈1,800 dalton), heat and acid-base stable, negatively charged, non hydrophobic substances. MBIs were found to be low MW (〈1,800 dalton) neutral or positively charged substances. MBIs had no effect on [3H]flunitrazepam (FNZP) binding, indicating that they are not endogenous benzodiazepine receptor ligands and they may act specifically on GABA binding site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00966871
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The realistic calculation and analyses of the multidimensional fission width in the quasi-stationary approximation (1990)
    Springer
    The European physical journal 335 (1990), S. 213-216 
    Details
    ISSN: 1434-601X
    Keywords: 25.85.-W ; 25.90.- +K
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The two-dimensional fission width in the quasi-stationary approximation is calculated by using the {c, h, α} parametrization. The difference between the two-dimensional and the one-dimensional cases is analyzed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294476
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    Paper (German National Licenses)
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