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  • 1
    Electronic Resource
    Electronic Resource
    Effects on the chicken monocular OKN of unilateral microinjections of GABAA antagonist into the mesencephalic structures responsible for OKN (1992)
    Springer
    Experimental brain research 90 (1992), S. 63-71 
    Details
    ISSN: 1432-1106
    Keywords: Accessory optic system ; GABAA receptor ; Microinjection ; Optokinetic nystagmus ; Chicken
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The SR 95531, a GABAA antagonist was microinjected into either the pretectum nuclei, (nucleus Superficialis Synencephali nSS) or the nBOR (nucleus Ectomammillaris nEM) of chickens. Monocular optokinetic nystamus (OKN) of each eye was recorded by the search coil technique before and after unilateral intracerebral drug administration. Before injection, monocular horizontal OKN in chickens, as in other lower vertebrates, displays a directional asymmetry: the stimulation in the Temporo-Nasal (T-N) direction is more efficient in evoking OKN than is stimulation in the Naso-Temporal (N-T) direction. Unilateral microinjections of SR 95531 into either the nSS or nEM induce a reversible increase of gain in OKN directed by the contralateral eye for both directions of stimulation. However administration into the nSS increased directional asymmetry by increasing the T-N component slow phase velocity more strongly than the N-T component slow phase velocity. On the other hand, the unilateral administration of the drug into the nEM suppressed the directional OKN asymmetry by increasing the N-T component slow phase velocity more strongly than the T-N component slow phase velocity. These results indicate that the drug suppresses GABAergic inhibition at the mesencephalic level. Moreover the nSS seems especially involved in monocular OKN in response to a T-N stimulation, while the nEM seems more involved in the OKN response to N-T stimulation. The increase in gain of OKN directed by the ipsilateral eye to microinjected nuclei could account for the strong interactions existing between these mesencephalic structures responsible for horizontal OKN.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229257
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Liquid Thermal Conductivity of Ternary Mixtures of Difluoromethane (R32), Pentafluoroethane (R125), and 1,1,1,2-Tetrafluoroethane (R134a)1 (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 319-328 
    Details
    ISSN: 1572-9567
    Keywords: correlation ; R125 ; R134a ; R32 ; refrigerant ; ternary mixture ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal conductivities of ternary refrigerant mixtures of difluoromethane (R32), pentafluoroethane (R125), and 1,1,1,2-tetrafluoroethane (R134a) in the liquid phase have been measured by the transient hot-wire method with one bare platinum wire. The experiments were performed in the temperature range of 233 to 323 K and in the pressure range of 2 to 20 MPa at various compositions. The measured data are correlated as a function of temperature, pressure, and composition. From the correlation, we can calculate the thermal conductivity of pure refrigerants and their binary or ternary refrigerant mixtures. The uncertainty of the measurements is estimated to be ±2%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006619209872
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Liquid Thermal Conductivity of Binary Mixtures of Pentafluoroethane (R125) and 1,1,1,2-Tetrafluoroethane (R134a) (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 55-62 
    Details
    ISSN: 1572-9567
    Keywords: mixture ; R125 ; R134a ; R125+R134a ; refrigerant ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Thermal conductivities of zeotropic mixtures of R125 (CF3CHF2) and R134a (CF3CH2F) in the liquid phase are reported. Thermal conductivities have been measured by a transient hot-wire method with one bare platinum wire. Measurements have been carried out in the temperature range of 233 to 323 K and in the pressure range of 2 to 20 MPa. The dependence of thermal conductivity on temperature, pressure, and composition of the binary mixture is presented. Measured thermal conductivity data are correlated as a function of temperature, pressure, and overall composition of the mixture. The uncertainty of our measurements was estimated to be better than 2%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021469928377
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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