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  • 1
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    Ionizing radiation decreases veratridine-stimulated uptake of sodium in rat brain synaptosomes (1983)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1983-06-03
    Description: Veratridine-stimulated uptake of sodium-22 in brain synaptosomes was significantly reduced by ionizing radiation over a dose range of 10 to 1000 rads. The response was dose-dependent and involved a decrease in the maximum effect of veratridine on uptake. The central nervous system may be more sensitive to ionizing radiation than generally thought, perhaps through a loss of the ability of the sodium channel to respond properly to stimulation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wixon, H N -- Hunt, W A -- New York, N.Y. -- Science. 1983 Jun 3;220(4601):1073-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6302846" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/drug effects/*radiation effects ; Dose-Response Relationship, Drug ; Dose-Response Relationship, Radiation ; Ion Channels/drug effects/radiation effects ; Male ; Rats ; Rats, Inbred Strains ; Sodium/*metabolism ; Synaptosomes/drug effects/*radiation effects ; Veratridine/*pharmacology ; Veratrine/*analogs & derivatives
    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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  • 2
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    Reaction of Q to thermal metamorphism in parent bodies: Experimental simulation (2018)
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    Publication Date: 2018
    Description: Abstract Planetary noble gases in chondrites are concentrated in an unidentified carrier phase, called “Q.” Phase Q oxidized at relatively low temperature in pure oxygen is a very minor part of insoluble organic matter (IOM), but has not been separated in a pure form. High‐pressure (HP) experiments have been used to test the effects of thermal metamorphism on IOM from the Orgueil (CI1) meteorite, at conditions up to 10 GPa and 700 °C. The effect of the treatment on carbon structural order was characterized by Raman spectroscopy of the carbon D and G bands. The Raman results show that the IOM becomes progressively more graphite‐like with increasing intensity and duration of the HP treatment. The carbon structural transformations are accompanied by an increase in the release temperatures for IOM carbon and 36Ar during stepped combustion (the former to a greater extent than the latter for the most HP treated sample) when compared with the original untreated Orgueil (CI1) sample. The 36Ar/C ratio also appears to vary in response to HP treatment. Since 36Ar is a part of Q, its release temperature corresponds to that for Q oxidation. Thus, the structural transformations of Q and IOM upon HP treatment are not equal. These results correspond to observations of thermal metamorphism in the meteorite parent bodies, in particular those of type 4 enstatite chondrites, e.g., Indarch (EH4), where graphitized IOM oxidized at significantly higher temperatures than Q (Verchovsky et al. ). Our findings imply that Q is less graphitized than most of the macromolecular carbonaceous material present during parent body metamorphism and is thus a carbonaceous phase distinct from other meteoritic IOM.
    Print ISSN: 1086-9379
    Electronic ISSN: 1945-5100
    Topics: Geosciences , Physics
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  • 3
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    THE USE OF POLARIZED LIGHT IN THE SIMULTANEOUS COMPARISON OF RETINALLY AND CORTICALLY FUSED COLORS (1936)
    American Association for the Advancement of Science
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    Publication Date: 1936-03-27
    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
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  • 4
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    SSME propellant path leak detection (1993)
    In:  Other Sources
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    Publication Date: 2013-08-29
    Description: Initial research established that the occurrence of a leak in the powerhead of the Space Shuttle Main Engine (SSME) is accompanied by a sudden, but sustained, change in intensity in a given region of an image. Based upon this, temporal processing of video images on a frame-by-frame basis has been used to detect leaks within a given field of view. The leak detection algorithm developed in this study consists of a digital highpass filter cascaded with a moving average filter applied at each point in the image field. The absolute value of the output is then averaged over the full frame to produce a single time-varying mean value estimate that is indicative of the intensity and extent of a leak. Recent work has included the processing of an extensive amount of data obtained from NASA MSFC to verify the performance of the leak detection system. Further research is being conducted on applying the leak detection algorithm to anomaly detection in the SSME exhaust by means of three channel color processing as opposed to single channel monochrome processing in the case of the leak detection system.
    Keywords: PROPELLANTS AND FUELS
    Type: Center for Space Transportation and Applied Research Fifth Annual Technical Symposium Proceedings; 00006 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Magnification of Time as a Research Technique in the Study of Behavior (1937)
    American Association for the Advancement of Science
    Details
    Publication Date: 1937-04-16
    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
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