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  • Other Sources  (2)
  • 1995-1999  (2)
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  • 1
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    Infrared observations of an outburst of small dust grains from the nucleus of Comet P/Halley 1986 III at perihelion (1995)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A close examination of the 0.7- to 23-micron infrared data base acquired by Gehrz and Ney (1992), suggests that the nucleus of Comet P/Halley 1986 III emitted a burst of small dust grains during a 3-day period commencing within hours of perihelion passage on 1986 February 9.46 UT. The outburst was characterized by significant increases in the coma's grain color temperature T(sub obs), temperature excess (superheat: S = T(sub obs)/T(sub BB)), infrared luminosity, albedo, and 10-micron silicate emission feature strength. These changes are all consistent with the sudden ejection from the nucleus of a cloud of grains with radii of approximately 0.5 micron. This outburst may have produced the dust that was responsible for some of the tail streamers photographed on 1986 February 22 UT. The peak of the dust outburst occurred about 3 days before a pronounced increase in the water production rate measured by the Pioneer Venus Orbiter Ultraviolet Spectrometer. We suggest that jets that release large quantities of small particles may be largely responsible for some of the variable infrared behavior that has been reported for P/Halley and other comets during the past two decades. Such jets may also account for some of the differences IR Type I and IR Type II comets.
    Keywords: ASTRONOMY
    Type: Icarus (ISSN 0019-1035); 113; 1; p. 129-133
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Circadian oscillations of cytosolic and chloroplastic free calcium in plants (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Tobacco and Arabidopsis plants, expressing a transgene for the calcium-sensitive luminescent protein apoaequorin, revealed circadian oscillations in free cytosolic calcium that can be phase-shifted by light-dark signals. When apoaequorin was targeted to the chloroplast, circadian chloroplast calcium rhythms were likewise observed after transfer of the seedlings to constant darkness. Circadian oscillations in free calcium concentrations can be expected to control many calcium-dependent enzymes and processes accounting for circadian outputs. Regulation of calcium flux is therefore fundamental to the organization of circadian systems.
    Keywords: Life Sciences (General)
    Type: Science (ISSN 0036-8075); 269; 5232; 1863-5
    Format: text
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    NASA TECHNICAL REPORTS
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