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  • SPACE BIOLOGY  (3)
  • Oscillatoria limnetica  (1)
  • 1985-1989  (4)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Anaerobic biosynthesis of unsaturated fatty acids in the cyanobacterium, Oscillatoria limnetica (1989)
    Springer
    Archives of microbiology 152 (1989), S. 215-217 
    Details
    ISSN: 1432-072X
    Keywords: Cyanobacterium ; Oscillatoria limnetica ; Anacrobic unsaturated fatty acid synthesis ; Positional isomers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The mechanism for synthesis of monounsaturated fatty acids under aerobic and anaerobic conditions was studied in the facultative anaerobic cyanobacterium, Oscillatoria limnetica. The hexadecenoic acid (C16∶1) of aerobically grown O. limnetica was shown to contain both the Δ7 (79%) and Δ9 (21%) isomers, while the octadecenoic (C18∶1) acid was entirely the Δ9 acid. Incorporation of [2-14C] acetate into the fatty acids under aerobic conditions resulted in synthesis of the Δ7 and Δ9 C16∶1 and the Δ9 C18∶1. Synthesis of unsaturated fatty acids in the presence of DCMU required sulfide. Anaerobic incubations in the presence of DCMU and sulfide (less than 0.003% atmospheric oxygen) resulted in a two-fold increase in monounsaturated fatty acids of both Δ7 and Δ9 C16∶1 and Δ9 and Δ11 C18∶1. The synthesis of these isomers is characteristic of a bacterialtype, anaerobic pathway.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00409653
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Unknown
    Planetary protection issues for sample return missions (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Planetary protection (PP) issues for both a comet nucleus sample return (CNSR) mission and a Mars rover sample return (MRSR) mission are discussed, with special attention given to the PP requirements for such missions, the exobiology science objectives for the CNSR and MRSR missions, and a qualitative PP risk assessment for both mission types. A set of contamination control procedures for both missions is presented, which identify procedures for each of the mission phases (i.e., the prelaunch, launch, sample handling, transit vehicle, and earth return). Recommendations for further research and technology development are discussed.
    Keywords: SPACE BIOLOGY
    Type: Planetary Biology and Origins of Life, 20th, 21st, and 23rd, Espoo, Finland, July 18-29, 1988) Advances in Space Research (ISSN 0273-1177); 203-206
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Life sciences and space research XXIII(2): Planetary biology and origins of life; Proceedings of the Topical Meeting and Workshops XX, XXI and XXIII of the 27th COSPAR Plenary Meeting, Espoo, Finland, July 18-29, 1988 (1989)
    In:  Other Sources
    Details
    Publication Date: 2016-03-09
    Description: This volume includes chapters on exobiology in space, chemical and early biochemical evolution, life without oxygen, potential for chemical evolution in the early environment of Mars, planetary protection issues and sample return missions, and the modulation of biological evolution by astrophysical phenomena. Papers are presented on the results of spaceflight missions, the action of some factors of space medium on the abiogenic synthesis of nucleotides, early peptidic enzymes, microbiology and biochemistry of the methanogenic archaeobacteria, and present-day biogeochemical activities of anaerobic bacteria and their relevance to future exobiological investigations. Consideration is also given to the development of the Alba Patera volcano on Mars, biological nitrogen fixation under primordial Martian partial pressures of dinitrogen, the planetary protection issues in advance of human exploration of Mars, and the difficulty with astronomical explanations of periodic mass extinctions.
    Keywords: SPACE BIOLOGY
    Type: (ISSN 0273-1177)
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Exobiology in Earth orbit: The results of science workshops held at NASA, Ames Research Center (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Workshops on Exobiology in Earth Orbit were held to explore concepts for orbital experiments of exobiological interest and make recommendations on which classes of experiments should be carried out. Various observational and experimental opportunities in Earth orbit are described including those associated with the Space Shuttle laboratories, spacecraft deployed from the Space Shuttle and expendable launch vehicles, the Space Station, and lunar bases. Specific science issues and technology needs are summarized. Finally, a list of recommended experiments in the areas of observational exobiology, cosmic dust collection, and in situ experiments is presented.
    Keywords: SPACE BIOLOGY
    Type: NASA-SP-500 , NAS 1.21:500
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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