At acidic conditions all the hydrogen cyanide is adsorbed; on the other hand, when pH is basic no adsorption is observed. This suggest that adsorption of HCN in sodium montmorillonite is mainly by cationic interchange. When the same clay, but

with a different cation in the interlamellar channel (calcium), is tested the same behavior is observed. A small amount of HCN is taken by kaolinite, and when pH is acidified a smaller fraction is retained due to clay starts to decompose. RAD001 mouse The adsorption of HCN in hectorite and attapulgite is differential. In the first case, just a very small amount is adsorbed, in the other, all is taken. Among clay minerals those with a high cationic interchange capacity or high superficial area are better adsorbents for HCN. Thus, we can 7-Cl-O-Nec1 cost propose clays as very good substrates to retain and concentrate this type of molecule. Bernal, J. D. (1951). The Physical Basis of Life. Rutledge and Keegan Paul, London. Boonman, A. M. S., Stark, R., van der Tak, F. F. S., van Dishoek, E. F.,

van der Wal, P. B., Shäfer, F., de Lange, G., and Laauwen, W. M. (2001). Highly Abundant HCN in the Inner Hot Envelope of GL 2591: Probing the Birth of a Hot Core? Astrophysics Journal, 553: L63-L67. Gerakines, P. A., Moore, M. H., and Hudson, R. L. (2004). Ultraviolet Photolysis and Proton Irradiation of Astrophysical Ice Analogs Containing Hydrogen Cyanide. Icarus, 170: 202–213. Irvine, W. M. (1998). Unoprostone Extraterrestrial Organic Matter: A Review. Origins of Life and Evolution of the Biosphere, 28: 365–383. Ip, W. H., Balsiger, H., Geiss, J., Goldstein, B. E., Kettmann, G., Lazarus, A. J., Meier, A., Rosenbauer, H., and Schelley, E. (1990). Giotto ISM Measurements of the Production Rate of Hydrogen Cyanide in the Coma of Comet Halley. Annales Geophysicae, 8: 319–325. Magee-Sauer K., Mumma, M. J., DiSanti, M. A., Russo, N. D., and Rettig, T. W. (1999). Infrared Spectroscopy of the ν3 Band of Hydrogen Cyanide in Comet C/1995 O1 Hale-Bopp. Icarus, 142: 498–598. Miller, S. and Orgel, L. (1974). The Origins

of Life on the Earth. Prentice Hall, Inc., New Jersey. Oró, J. and Lazcano-Araujo, A. (1981). The Role of HCN and its Derivatives in Prebiotic Evolution. In Vennesland, B., Conn, E. E., Knowles, C. J., Westley, J. and Wissing, F., editors, Cyanide in Biology, pages 517–541. Academic Press, London. Ponnamperuma, C., Shimoyama, A., and Friebele, E. (1982). Clay and the AZD5582 in vivo Origin of Life. Origins of Life, 12: 9–40. E-mail: mcolin@nucleares.​unam.​mx Analysis of Sugar Derivatives in Carbonaceous Meteorites George Cooper, Minakshi Sant, Alanna O’leary, Cynthia Asiyo NASA-Ames Research Center, Space Science Division Moffett Field, CA 94035 Carbonaceous meteorites contain a diverse suite of soluble organic compounds. These compounds were delivered to the early Earth in asteroids (and possibly comets) and therefore may have played an important role in the origin and/or evolution of life.