+ Visit NASA.gov + Contact NASA   + Home Select Search Field * All Report - Patent Number Abstract *Accession Number *NASA Center *Author NameDocument IDKeywordsPublication Date *Title * Find Results With All of the words At least one of the words Enter Search Term  within returned results    Search Tips: Use only the fields with * to search NIX collection. Enclose terms in double quotation marks (") to search for exact phrases, ie: "space shuttle". NOTE: Commas and dashes are removed from search term by search engine. Select Reset Search button to start a new search. See Help for more tips. + NASA Center + Publication Year + Subject + Availability Options + Item/Media Type Selected Navigations: Author > Bar-Nun, A. [x] Sort results by: NASA Center | Date Added to NTRS | Publication Year There are a total of 19 record(s) matching your query. Sorted by: Date Added To NTRS in Descending order Prev 1 2  Photochemical reactions of water and carbon monoxide in earth's primitive atmosphere Author(s): Bar-Nun, A.; Chang, S. Abstract: The gas-phase photolysis of H2O at 1849 A in the presence of CO yields mainly CO2 and H2 and a variety of organic compounds, including C1-C3 hydrocarbons, alcohols, aldehydes, acetone, and acetic acid. The overall quantum ... NASA Center: Ames Research Center Publication Year: 1983 Added to NTRS: 2004-11-03 Accession Number: 83A42847; Document ID: 19830061629 Amino acid synthesis in simulated primitive environments Author(s): Bar-Nun, A.; Bar-Nun, N.; Bauer, S. H.; Hulett, H. R.; Sagan, C. Abstract: Amino acid synthesis in simulated primitive environments, discussing possible effects of meteoric kinetic energy and lightning-associated shock waves NASA Center: NASA (non Center Specific) Publication Year: 1970 Added to NTRS: 2004-11-03 Accession Number: 71A13015; Document ID: 19710032318 Shock synthesis of amino acids in simulated primitive environments Author(s): Bar-Nun, A.; Bar-Nun, N.; Bauer, S. H.; Sagan, C. Abstract: Primitive earth prebiological organic synthesis via amino acids shock heating in atmosphere-simulating gas mixture, suggesting energy sources from atmospheric entry NASA Center: NASA (non Center Specific) Publication Year: 1970 Added to NTRS: 2004-11-03 Accession Number: 70A27269; Document ID: 19700051153 Could life have evolved in cometary nuclei Author(s): Bar-Nun, A.; Lazcano-Araujo, A.; Oro, J. Abstract: The suggestion by Hoyle and Wickramasinghe (1978) that life might have originated in cometary nuclei rather than directly on the earth is discussed. Factors in the cometary environment including the conditions at perihelion ... NASA Center: NASA (non Center Specific) Publication Year: 1981 Added to NTRS: 2004-11-03 Accession Number: 82A20025; Document ID: 19820036490 Gas release from comets Author(s): Notesco, G.; Kleinfeld, I.; Laufer, D.; Bar-Nun, A. Abstract: The quantities of such volatiles as CO, CO2, and CH4 trapped in cometary water ice are of great importance in the determination of solar nebula temperature and composition in the regions of their formation. Experiments with ... NASA Center: NASA (non Center Specific) Publication Year: 1991 Added to NTRS: 2004-11-03 Accession Number: 91A26275; Document ID: 19910041652 Inhomogeneous models of Titan's aerosol distribution Author(s): Podolak, M.; Bar-Nun, A.; Noy, N.; Giver, L. P. Abstract: A model of Titan's aerosol is presented which allows the particle size to vary with height. The model assumes a refractive index appropriate to an ethylene polymer and a mass flux independent of height equal to the value ... NASA Center: Ames Research Center Publication Year: 1984 Added to NTRS: 2004-11-03 Accession Number: 84A25042; Document ID: 19840042255 'Thunder' - Shock waves in pre-biological organic synthesis. Author(s): Bar-Nun, A.; Tauber, M. E. Abstract: Theoretical study of the gasdynamics and chemistry of lightning-produced shock waves in a postulated primordial reducing atmosphere. It is shown that the conditions are similar to those encountered in a previously performed ... NASA Center: Ames Research Center Publication Year: 1972 Added to NTRS: 2004-11-03 Accession Number: 72A36443; Document ID: 19720052777 Lightning activity on Jupiter Author(s): Borucki, W. J.; Bar-Nun, A.; Scarf, F. L.; Look, A. F.; Hunt, G. E. Abstract: Photographic observations of the nightside of Jupiter by the Voyager 1 spacecraft show the presence of extensive lightning activity. Detection of whistlers by the plasma wave analyzer confirms the optical observations and ... NASA Center: Ames Research Center Publication Year: 1982 Added to NTRS: 2004-11-03 Accession Number: 83A22933; Document ID: 19830041715 Shock synthesis of amino acids in simulated primitive environments. Author(s): Bar-Nun, A.; Bar-Nun, N.; Bauer, S. H.; Sagan, C. Abstract: A single pulse shock tube of a uniform bore was used in the experiments. The reaction mixture consisted of 3.3 per cent methane, 11 per cent ethane, and 5.6 per cent ammonia, diluted with ultra-pure argon. The formation of ... NASA Center: Ames Research Center Publication Year: 1971 Added to NTRS: 2004-11-03 Accession Number: 72A14761; Document ID: 19720031095 Prev 1 2  + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007