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  • LUNAR AND PLANETARY EXPLORATION  (2)
  • Animals  (1)
  • 1980-1984  (3)
  • 1975-1979
  • 1982  (3)
  • 1
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    Abnormal development of kitten retino-geniculate connectivity in the absence of action potentials (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-08-20
    Description: Action potentials were silenced in one eye of neonatal kittens by repeated intraocular injections of tetrodotoxin for 5 to 8 weeks. After tetrodotoxin blockade was allowed to wear off, receptive field properties of individual relay cells in the lateral geniculate nucleus were examined. The many ON-OFF and binocular fields found in the layers that receive input from the treated eye suggest that these cells had extremely abnormal retino-geniculate synaptic connections. These effects were different in kind from those seen after deprivation rearing that does not silence action potentials. Lack of action potential activity was concluded to lead to abnormal development in the central nervous system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Archer, S M -- Dubin, M W -- Stark, L A -- 7F32 EY 05442/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 1982 Aug 20;217(4561):743-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7100921" target="_blank"〉PubMed〈/a〉
    Keywords: *Action Potentials ; Animals ; Animals, Newborn ; Cats/*growth & development ; Evoked Potentials, Visual ; Facial Nerve/*growth & development ; Geniculate Ganglion/*growth & development ; Optic Nerve/growth & development ; Retina/*growth & development ; Sensory Deprivation ; Synapses/physiology ; Tetrodotoxin/pharmacology ; Visual Pathways/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 2
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    Tharsis volcanoes - Separation distances, relative ages, sizes, morphologies, and depths of burial (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Network analysis indicates the separation distances of the Tharsis volcanoes to be 700 to 900 km; this is considered to be the thickness of the Tharsis thermal lithosphere or 'tectosphere' which has thickened with time. Although as a whole the Tharsis volcanoes exhibit a random distribution, preferential alignments emerge when the history of the region is divided into separate periods. The preferential alignments mimic those of fractures in the surrounding terrain. Photogeologic and morphometric data indicate that the volcanoes fall into four distinct classes: montes, tholi, paterae, and a class whose sole representative is Alba Patera. The volcanoes have been buried by lava up to about 4 km in thickness. The sizes of the volcanoes directly correlate with their separation distances from their nearest neighbors. It is concluded that the greater the lithosphere thickness, the larger will be the volcano and the greater its separation distance from its nearest neighbor.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A preliminary analysis of lunar extra-mare basalts - Distribution, compositions, ages, volumes, and eruption styles (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Extra-mare basalts occupy 8.5% of the lunar basalt area and comprise 1% of the total mare basalt volume. They are preferentially located where the crust is thin and topographically low. In terms of age, eruption style, and composition they are as variable as the mare basalts. In some instances extrusion in extra-mare craters was preceded by floor-fracturing whereas in other cases it apparently was not. The volume of lava erupted may have been controlled more by the volume of magma produced than by hydrostatic effects. A minimum of nearly 1300 separate basalt eruptions is indicated; the true value could be nearer 30,000 separate eruptions.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Moon and the Planets; 26; May 1982
    Format: text
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    NASA TECHNICAL REPORTS
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