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  • Other Sources  (7)
  • 1
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    Laboratory test results of the high speed optical tracking system for the Spaceborne Geodynamic Ranging System (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The high speed, high resolution optical tracking system for the Spaceborne Geodynamic Ranging System employs a two-axis gimbaled pointing device that can operate from a Space Shuttle platform and can track multiple retroreflector ground targets with arcsec accuracy. Laboratory tests of the stepping characteristics of the pointing system for various step sizes and directions has shown arcsec repeatability with little wasted motion, overshoot, or ringing. The worst rms tracking jitter was 1 and 2 arcsec in the roll and pitch axes, respectively, at the maximum tracking rate of 2 deg/sec.
    Keywords: SPACECRAFT INSTRUMENTATION
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  • 2
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    Detection of microbes in the subsurface (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The search for evidence of microbial life in the deep subsurface of Earth has implications for the Mars Rover Sampling Return Missions program. If suitably protected environments can be found on Mars then the instrumentation to detect biomarkers could be used to examine the molecular details. Finding a lipid in Martian soil would represent possibly the simplest test for extant or extinct life. A device that could do a rapid extraction possibly using the supercritical fluid technology under development now with a detection of the carbon content would clearly indicate a sample to be returned.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: NASA, Ames Research Center, Exobiology and Future Mars Missions; p 63-64
    Format: application/pdf
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  • 3
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    Theoretical investigation of the role of clay edges in prebiotic peptide bond formation. II - Structures and thermodynamics of the activated complex species (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Molecular orbital calculations are used to study amino acid activation by anhydride formation in neutral phosphates and in tetrahedral silicate and aluminate sites on clay edges. The results agree with previous ab initio studies of Luke et al. (1984) on the reactant species. Relative heats of formation of the anhydrides indicate the extent of anhydride formation to be the greatest for Al and the least for phosphate, which is the same order as the stability of hydrolysis.
    Keywords: SPACE BIOLOGY
    Type: Origins of Life (ISSN 0169-6149); 18; 1-2
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  • 4
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    Kinetic analysis of the template effect in ribooligoguanylate elongation (1987)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The paper presents kinetic studies on the reaction of elongation of the 3-prime-5-prime-linked ribooligoguanylates with guanosine 5-prime-phospho-2-methylimidazolide (2-MelmpG) in the presence or absence of a complementary template, the polycytidylic acid. In the absence of poly(C), the reaction leads to three isomeric oligomers that are elongated by one monomer unit: the 3-prime-5-prime linked, the 2-prime-5-prime linked, and the pyrophosphate, formed in a ratio of 1:2:5. In the presence of the template, the reaction is 20-fold faster and yields products (n + 1), (n + 2), (n + 3), etc., as long as 2-MelmpG is available. The formation of the natural, 3-prime-5-prime-linked isomer, is enhanced selectively by 140-fold at 37 C, and its relative yield increases with decreasing temperature.
    Keywords: SPACE BIOLOGY
    Type: Origins of Life (ISSN 0302-1688); 17; 3-4; 333-349
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  • 5
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    Theoretical investigation of the role of clay edges in prebiotic peptide bond formation. I - Structures of acetic acid, glycine, H2SO4, H3PO4, Si(OH)4, and Al(OH)4(-) (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: International Journal of Quantum Chemistry, Quantum Biology Symposium no. 11 (ISSN 0360-8832); 117-135
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  • 6
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    Ram-pressure stripping of the multiphase interstellar medium of the Virgo cluster elliptical galaxy M86 (NGC 4406) (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The available infrared, optical, and X-ray data on the elliptical galaxy M86, which is experiencing strong ram-pressure stripping in the intracluster medium of the Virgo Cluster, are analyzed. A significant component of infrared 60 micron emission displaced from the center of the galaxy is found. The displaced 60 micron emission lies on the optical major axis of the galaxy in the direction of perturbations to the optical isophotes and is coincident with a small feature in X-ray emission southwest of the X-ray plume. The displaced infrared emission is interpreted in terms of collisionally heated dust exposed to hot gas where ram pressure and turbulence are disrupting the stripped interstellar medium of the galaxy. The displacement of the outer optical isophotes in the direction of the stripped gas in suggested to be due to reflection of star-light on the dust grains. Ram pressure has separated and exposed the various components of the multiphase interstellar medium of M86, enabling these constituents to be identified and analyzed separately for the first time in an elliptical galaxy.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 375; 35-45
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  • 7
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    Miniature, Cooled Pressure-Measuring Probe (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Probe designed to reduce settling time dramatically. Pressure-sensing transducer mounted in probe and connected to tip by short tube having cross-sectional area substantially smaller than conventional connecting tubes. Probe includes stainless-steel cylindrical exterior housing holding closed pressure chamber in which piezoelectric pressure transducer mounted. Open connecting tube passes portion of high-velocity, high-temperature fluid stream into closed pressure chamber. Any change of pressure in sampled stream propagates into closed pressure chamber with settling time inversely proportional to cross-sectional area of connecting tube. Cooling chamber formed around pressure chamber connected to source of water or other cooling fluid via inlet and outlet tubes.
    Keywords: PHYSICAL SCIENCES
    Type: LAR-13853 , NASA Tech Briefs (ISSN 0145-319X); 18; 2; P. 32
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