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  • LIFE SCIENCES (GENERAL)  (3)
  • ASTRONAUTICS (GENERAL)  (2)
  • 1990-1994  (5)
  • 1980-1984
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  • 1
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    Galileo trajectory design (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The trajectory design of the Galileo spacecraft is examined. The Galileo spacecraft was launched on a six-year long trip to Jupiter in October 1989. A new Venus-Earth-Earth-Gravity Assist (VEEGA) trajectory mode is being used for the transfer to Jupiter and involves two phasing orbits around the sun and gravity-assist flybys with Venus. The aggregate delta V acquired from these flybys is 18.3 km/s. The interplanetary trajectory includes a close flyby of asteroid 951-Gaspra in October 1991 and a possible flyby of 243-Ida in August 1993. After arrival at Jupiter in December 1995, the previously released Galileo atmospheric probe will relay data to earth via the Galileo Orbiter. The orbital phase of the mission will involve 10 orbits of Jupiter over a 22 month period. In this phase the Orbiter will use repeated gravity-assisted flybys of Europa, Ganymede and Callisto during which Jupiter, its magnetosphere and the Galilean satellites will be investigated. The mission is scheduled to end in October 1997.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Space Science Reviews (ISSN 0038-6308); 60; 1-4,
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Intermittent acceleration as a countermeasure to soleus muscle atrophy (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The effectiveness of using intermittent acceleration as a countermeasure to muscle atrophy was investigated in rats subjected to 7 days of hindlimb suspension interrupted by daily periods of 1.2 g acceleration, for 15-min periods evenly spaced over 12-hr interval. It was found that this regimen, when repeated for 7 days, failed to completely maintain the mass of soleus muscle, which was 84 percent of control.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Journal of Applied Physiology (ISSN 8750-7587); 72; 428-433
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Glutamine synthetase immunor present in oligodendroglia of regions of the central nervous system (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Glutamine synthetase immunoreactive oligodendrocytes were identified in the cerebral cortex, cerebellum, brain stem, and spinal cord. They were mostly confined to the gray matter, particularly close to neurons and processes. The white matter showed few immunoreactive oligodendroglia. It was suggested that some type of oligodendrocytes, specially those in perineuronal location, might fulfill a functional role more akin to astrocytes than to the normally myelinating oligodendroglia.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: GLIA (ISSN 0894-1491); 3; 335-341
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    NASA TECHNICAL REPORTS
  • 4
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    Centrifugal intensity and duration as countermeasures to soleus muscle atrophy (1990)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The effects of artificially induced gravity on the atrophy process of slow-twitch soleus muscle are studied in order to determine whether centrifugation could be an effective countermeasure to nonweight bearing at 1 G. It is observed that the soleus muscle atrophied 32 percent during seven days of nonweight bearing without countermeasures, and centrifugation treatment did not completely prevent atrophy relative to precontrol wet weight of the soleus muscle. Nonweight-bearing groups receiving treatments of 1, 1.5, or 2.6 G had 48, 56, and 65 percent, respectively, of the atrophy observed in a nonweight-bearing-only group compared with the precontrol group. It is concluded that, as a countermeasure to nonweight-bearing-induced atrophy of the soleus muscle, centrifugation at 2.6 G is no more effective than exposure to 1 or 1.5 G.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Journal of Applied Physiology (ISSN 0161-7567); 69; 1387-138
    Format: text
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  • 5
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    The Cambridge encyclopedia of space (revised edition) (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: A comprehensive and intensively illustrated development history is presented for spaceflight, ranging over its basic concepts' speculative and fictional origins, the historical roots of rocket-related technologies, and the scientific accomplishments of earth orbit and interplanetary missions to date. Attention is given to propulsion systems, spaceflight launch centers, satellite systems, and solar system exploration by the U.S. and the Soviet Union. Current space-related activities encompass the meteorology, remote sensing, telecommunications and direct broadcasting, and navigation functions of unmanned satellites, as well as such manned spacecraft roles as medical and materials science research. The military uses of space, and increasingly important space industrialization concepts, are discussed as well.
    Keywords: ASTRONAUTICS (GENERAL)
    Format: text
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    NASA TECHNICAL REPORTS
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