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  • 1
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    Distribution and significance of carbon compounds on the moon. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Exploration of available information concerning carbon on the moon, following review of what is known about carbon on the earth, and consideration of the results of studies of meteorites, which have provided the first direct clues about extraterrestrial carbon. Carbon and carbon isotope composition data taken from Apollo 11 samples are tabulated. Carbon compounds produced by pyrolysis, extracted with benzene-methanol, extracted with water, and freed by acid treatment are discussed. Carbon and carbon compounds in lunar rocks and soils appear to be distributed heterogeneously.
    Keywords: BIOSCIENCES
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Criteria for distinguishing biogenic and abiogenic amino acids - Preliminary considerations. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Criteria to determine the mode of origin of amino acids can be established by consideration of their structure, enantiometric distribution, composition, and relative abundance. A population of dominantly protein amino acids with one enantiomeric configuration most likely had a biological origin. Biological amino acids do racemize, however, so the absence of optical activity would not rule out the possibility that the amino acids in a racemic mixture were originally synthesized biologically. For racemic amino acids, therefore, structure, composition and relative abundance become important in ascertaining the origin of these compounds. Abiotically synthesized amino acids have a population composed of both protein and nonprotein structures present as racemic mixtures.
    Keywords: BIOSCIENCES
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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