Photoreceptor fine structure inOreochromis niloticusL. (Cichlidae; Teleostei) in light- and dark-adaptation
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چکیده
منابع مشابه
Morphology of retinal photoreceptor layer in continuous light-exposed and dark-adapted male cats
The morphology of retinal photoreceptor layer was studied in continuous light-exposed and dark-adapteddomestic male cats (Felis catus). The eyes of 12 healthy adult cats (4 in continuous light-exposed group, 4 in continuous dark-adapted group, and 4 in control group) were routinely fixed and studied by electron microscope. Results showed that the general structure of photoreceptor layer in this...
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The illumination at the earth’s surface varies by . 10 orders of magnitude during the normal day–night cycle, and the vertebrate visual system covers this entire range of light intensities with two neuronal subsystems that rely on the activity of two types of photoreceptor cells, rods and cones. Human rod vision operates over approximately seven decimal orders of illumination. The cone visual s...
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The high-frequency cutoff of the semicircular canals is unknown but probably also lies above 5 Hz. The high-frequency cutoff of the extraocular muscles is 1 Hz. so that central mechanisms (that introduce phase lead) must compensate from 1 to 5 Hz. The pursuit system begins to cut off between 0.5 to 1 Hz. so that it can compensate for slow head movements while the vestibular system compensates f...
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In the preceding letter (Pepperberg, 2001), Dr. David Pepperberg offers an alternative interpretation to that given in our recent paper (Nikonov et al., 2000) for the nature of the changes underlying light adaptation in rod photoreceptors. We do not agree with Dr. Pepper-berg's interpretation, and we set out our reasons below. From the outset, we should make it clear that we and Dr. Pepperberg ...
متن کاملmorphology of retinal photoreceptor layer in continuous light-exposed and dark-adapted male cats
the morphology of retinal photoreceptor layer was studied in continuous light-exposed and dark-adapteddomestic male cats (felis catus). the eyes of 12 healthy adult cats (4 in continuous light-exposed group, 4 in continuous dark-adapted group, and 4 in control group) were routinely fixed and studied by electron microscope. results showed that the general structure of photoreceptor layer in this...
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ژورنال
عنوان ژورنال: The Anatomical Record
سال: 1998
ISSN: 0003-276X,1097-0185
DOI: 10.1002/(sici)1097-0185(199811)252:3<453::aid-ar13>3.0.co;2-3