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  • 1
    Publication Date: 1986-05-23
    Description: Two metabolites of the steroid hormones progesterone and deoxycorticosterone, 3 alpha-hydroxy-5 alpha-dihydroprogesterone and 3 alpha, 5 alpha-tetrahydrodeoxycorticosterone, are potent barbiturate-like ligands of the gamma-aminobutyric acid (GABA) receptor-chloride ion channel complex. At concentrations between 10(-7) and 10(-5)M both steroids inhibited binding of the convulsant t-butylbicyclophosphorothionate to the GABA-receptor complex and increased the binding of the benzodiazepine flunitrazepam; they also stimulated chloride uptake (as measured by uptake of 36Cl-) into isolated brain vesicles, and potentiated the inhibitory actions of GABA in cultured rat hippocampal and spinal cord neurons. These data may explain the ability of certain steroid hormones to rapidly alter neuronal excitability and may provide a mechanism for the anesthetic and hypnotic actions of naturally occurring and synthetic anesthetic steroids.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Majewska, M D -- Harrison, N L -- Schwartz, R D -- Barker, J L -- Paul, S M -- New York, N.Y. -- Science. 1986 May 23;232(4753):1004-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2422758" target="_blank"〉PubMed〈/a〉
    Keywords: 20-alpha-Dihydroprogesterone/*analogs & derivatives/metabolism/pharmacology ; Animals ; Bicyclo Compounds/metabolism ; *Bicyclo Compounds, Heterocyclic ; Binding, Competitive ; Brain/metabolism ; Cells, Cultured ; Chlorides/metabolism ; Desoxycorticosterone/*analogs & derivatives/metabolism/pharmacology ; Drug Synergism ; Flunitrazepam/metabolism ; Hippocampus/metabolism ; In Vitro Techniques ; Ion Channels/metabolism ; Progesterone/*analogs & derivatives/metabolism/pharmacology ; Rats ; Receptors, GABA-A/*drug effects/metabolism ; Spinal Cord/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 1981-03-27
    Description: The binding of [3H]diazepam to benzodiazepine receptors was studied in extensively washed membranes of rat cerebral cortex in the presence of the depressant barbiturate, pentobarbital. Pentobarbital, like the endogenous neurotransmitter gamma-aminobutyric acid (GABA), increased the basal binding and also potentiated the GABA-enhanced binding of [3H]diazepam to benzodiazepine receptors by increasing the apparent affinity of [3H]diazepam for the benzodiazepine receptor. The concentrations of pentobarbital necessary to elicit these effects in vitro are the same as those observed after treatment with pharmacologically relevant doses, suggesting that a common neurochemical association may exist between these types of compounds.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Skolnick, P -- Moncada, V -- Barker, J L -- Paul, S M -- New York, N.Y. -- Science. 1981 Mar 27;211(4489):1448-50.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6258230" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cerebral Cortex/drug effects ; Chlorides/metabolism ; Diazepam/metabolism ; Male ; Pentobarbital/*pharmacology ; Rats ; Receptors, Drug/*drug effects/metabolism ; Receptors, GABA-A ; Stimulation, Chemical ; gamma-Aminobutyric Acid/pharmacology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2019-07-13
    Description: A general overview of the LANDSAT 4 system with emphasis on the Thematic Mapper (TM) is presented. A variety of topics on the design, calibration, capabilities, and image processing techniques of the TM sensor are discussed in detail. The comparison of TM data with other MSS data is also investigated.
    Keywords: GEOSCIENCES (GENERAL)
    Type: E84-10166 , NASA-CP-2326-VOL-1 , NAS 1.55:2326-VOL-1 , Proc. of LANDSAT-4 Early Results Symp.; 22-24 Feb. 1983; Greenbelt, MD; United States|LANDSAT Sci. Characterization Workshop; 6 Dec. 1983
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  • 4
    Publication Date: 2019-07-13
    Description: A series of brief summaries of the results of individual investigations of LANDSAT 4 image data characteristics are presented. Topics are divided into MSS and TM investigations, and applications of the imaging techniques. Radiometric and geometric accuracy are emphasized.
    Keywords: GEOSCIENCES (GENERAL)
    Type: E84-10167 , NASA-CP-2326-VOL-2 , NAS 1.55:2326-VOL-2 , LANDSAT-4 Early Results Symposium; 22-24 Feb. 1983; Greenbelt, MD; United States
    Format: application/pdf
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