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  • 1970-1974  (6)
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Year
  • 1
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    Neural Biology (1973)
    Springer Nature
    Details
    Publication Date: 1973-09-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 2
    Electronic Resource
    Electronic Resource
    The electrophysiology of the retina ofPeriplaneta americana L. (1973)
    Springer
    Journal of comparative physiology 83 (1973), S. 279-288 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. Retinula cells ofPeriplaneta in the same state of morphological adaptation differ among themselves in absolute sensitivity by up to 1 log unit (tenfold). 2. Morphologically dark-adapted retinula cells are, on average, ten times as sensitive as light-adapted cells to light on the optical axis. 3. All retinula cells are about 5 times as sensitive to plane polarized light in the plane of its optimum effectiveness as in the orthogonal plane. 4. Retinula cells fall into two groups with optimum plane of polarization 90 ° apart, corresponding with the 2 planes of rhabdomeric microvilli.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693679
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The electrophysiology of the retina ofPeriplaneta americana L. (1973)
    Springer
    Journal of comparative physiology 83 (1973), S. 263-278 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. Intracellularly recorded illumination potentials from retinula cells (probably the green sensitive cells) of the cockroachPeriplaneta show the typical tetraphasic responses to graded intensities of light. In the dark-adapted state, the plateau phase is relatively greater than in the light-adapted state, and, in general, the responses are larger. 2. Angles of acceptance in the light-adapted state are 2.4±0.9 ° SD for the horizontal plane and 2.3±0.6 ° SD for the vertical plane. Angles of acceptance were about three times larger for dark-adapted cells, being 6.7±1.8 ° SD in the horizontal plane and 6.9±1.3 ° SD in the vertical plane. 3. In each state, the visual fields are circularly symmetrical. 4. The pigment movements and the palisade which develops upon dark-adaptation (Butler, 1973b) are the only anatomical features which can account for this change in acuity. 5. The above changes are similar in all ommatidia. Combining these measurements with the map of interommatidial angles (Butler, 1973a) leads to the conclusion that movement perception is not constant in different parts of the eye, and that changes during adaptation have unequal effects on movement perception in different parts of the eye.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693678
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  • 4
    Electronic Resource
    Electronic Resource
    The exact neural projection of the visual fields upon the first and second ganglia of the insect eye (1970)
    Springer
    Journal of comparative physiology 66 (1970), S. 369-378 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In apposition eyes with fused rhabdomeres, six retinula cells of one ommatidium have short axons which terminate in a single cartridge. Each ommatidium corresponds to one lamina cartridge, the two ganglion cell axons of which, together with the long axons from that ommatidium and a fifth axon, proceed as a bundle through the lamina-medulla chiasma to form a cartridge of the medulla. The projection of the lamina cartridges upon those of the medulla forms a series exactly in order but reversed about the vertical plane. In the fly Calliphora, in which the optical axes of the rhabdomeres of a single ommatidium diverge, the existing description of the projection to the lamina is confirmed and extended to the medulla. As in fused rhabdomere eyes, the lamina cartridges project by bundles, each of which contains five axons, in an exact series but in reverse order, to the cartridges of the medulla. Therefore in each type of eye there is an exact projection of the external environment upon the optic medulla.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00299936
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  • 5
    Electronic Resource
    Electronic Resource
    Angular sensitivity of the retinula cells of dark-adapted worker bee (1971)
    Springer
    Journal of comparative physiology 74 (1971), S. 329-335 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Electrophysiological determination of the angular sensitivity of 16 worker bee retinula cells gives a value for horizontal acceptance angle of 2.5°±0.4° (S.D.) and for vertical acceptance angle of 2.7°±0.8° (S.D.). This value is in agreement with previous behavioural studies, but is clearly at variance with a recent analysis of the ommatidial dioptric by ray optics, which gives a value of 5° for the acceptance angle. It is suggested that this results from the failure of ray optics to take diffraction effects into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00297733
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  • 6
    Electronic Resource
    Electronic Resource
    The optical function of changes in the medium surrounding the cockroach rhabdom (1972)
    Springer
    Journal of comparative physiology 81 (1972), S. 1-8 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the dark-adapted eye of the cockroachPeriplaneta, the fused rhabdom is surrounded by a clear watery palisade; in the light-adapted eye this is replaced by pigment. The refractive indices of the rhabdom and its surround have been measured. The physiological effects of this change in structure has been analysed by the electromagnetic theory of light guides. The optical constants are theoretically consistent with the measured tenfold change in sensitivity and changes in acceptance angle of the retinula cells from 6.7 ° ¦(dark-adapted) to 2.4 ° (light-adapted).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693546
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