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  • 1
    ISSN: 1432-2072
    Keywords: Haloperidol ; Nomifensine ; Lorazepam ; Visual tilt illusion ; GABA ; Dopamine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effects of haloperidol, nomifensine and lorazepam on the visual tilt illusion were studied in normal volunteers. Haloperidol and nomifensine produced no significant changes in the illusion, although in previous work they had been found to reduce and and enhance, respectively, a closely related illusion, the tilt aftereffect. By contrast, lorazepam produced a dose-related increment in the size of the tilt illusion, but had no effect on the tilt aftereffect. The results are discussed in relation to proposed mechanisms which may underlie the two kinds of illusion. The differential effects of individual drugs on the two illusions may reflect their differing actions on two processes: lateral inhibition and adaptation in visual channels.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 117 (1995), S. 379-384 
    ISSN: 1432-2072
    Keywords: Lorazepam ; Human ; Contrast sensitivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The anxiolytic lorazepam was studied for its effects on contrast sensitivity to gratings flickering in counterphase in normal volunteers. The drug significantly reduced contrast sensitivity at low spatial frequencies in a dose-related manner. The results are discussed with reference to possible GABA-mediated processes in the retina and lateral geniculate nucleus.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0878
    Keywords: Epidermis ; Salmonids ; Mucous cells ; Mucus ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of epidermal mucous cells of two species of salmonid fish has been described. Mucous cells are, next to filament-containing cells, the most commonly encountered cells in fish epidermis. The development of the cells as they progress to the periphery has been characterised. They are initially difficult to distinguish from filament-containing cells: later, they can be recognised by the presence of much smooth-surfaced E.R. The mucigenesis and the subsequent secretion of mucus has been observed and it is essentially comparable to that which occurs in the mucous cells of the mammalian intestine. The mucous layer of the epidermal surface seems to mainly comprise of the products of these mucous cells and the “cuticle” seen in other species has not yet been observed in the salmonid species investigated here.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0878
    Keywords: Epidermis ; Salmonids ; Regional differences ; Filament-containing cells ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of the epidermis of two species of salmonid fish has been described. Gross characteristics have been noted along with many apparent differences in the epidermis of different body regions of the fish. The major cell type is the filamentcontaining cell and this has been described in detail. The major inclusions of the cell are the tonofilaments. Differences in basal, mid-epidermal and peripheral filament-containing cells have been characterised. Comparisons of fish epidermis with that of other vertebrates has been made.
    Type of Medium: Electronic Resource
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