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  • 1985-1989  (2)
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  • 1
    ISSN: 1573-7381
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In electrophysiological experiments involving intracellular recording from horizontal cells in the isolated retina of the roach, light adaptation of the retina has been shown to result in potentiation both of (1) the depolarizing component of biphasic chromaticity type S-potentials, and (2) the temporal frequency transfer functions of photopic luminosity type horizontal cells. Under identical light adaptation conditions, the number of spinules on horizontal cell dendrites positioned laterally at cone pedicle ribbon synapses, increase by some threefold. The latter effect occurs equally in pedicles of red- and green-sensitive cones. Thus, horizontal cells are ‘plastic’ in both structural and electrophysiological respects. Furthermore, since the two electrophysiological parameters studied depend on negative feedback from horizontal cells onto cones, the results suggest that it is the inhibitory synapses that are plastic and that spinules may be sites of the negative feedback interaction. Physiological and behavioural aspects of light-dependent horizontal cell plasticity are also discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 322-327 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The application of single-pulse shock tube techniques in the study of heterogeneous reactions is described. In particular, nitric oxide removal on carbonaceous materials at temperatures simulating pulverized coal firing is reported. Carbon black particulates were suspended and heated behind reflected shock waves in order to simulate flame-borne particulates. To meet the specific requirement of preshock conditions, a novel and simple powder aspirator was designed and fabricated for dispersing carbon black. Particle concentrations measured by a gravimetric method and by in-line light transmission were compared. Changes of nitric oxide concentration, reaction products and volatile species emitted from the particulates were analyzed with gas chromatographic techniques. Representative results of nitric oxide reduction by carbon black particulates at concentrations up to 50 g/m3 are provided, and indicate that single-pulse shock tubes coupled with a simple powder aspirator may be used to infer global rates for gas/solid reactions of potential importance in combustion.
    Type of Medium: Electronic Resource
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