Acetylene-based pathways for prebiotic evolution on Titan

Details Acetylene-based pathways for prebiotic evolution on Titan Acetylene-based pathways for prebiotic evolution on Titan

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.518..345a&link_type=abstract

In: Proceedings of the First European Workshop on Exo-Astrobiology, 16 - 19 September 2002, Graz, Austria. Ed.: Huguette Lacoste

Biology

5

Titan: Evolution, Biochemistry

Scientific paper

Due to Titan's reducing atmosphere and lack of an ozone shield, ionizing radiation penetrates the atmosphere creating ions, radicals and electrons that are highly reactive producing versatile chemical species on Titan's surface. We propose that the catalytic hydrogenation of photochemically produced acetylene may be used as simple metabolic pathway by organisms at or near Titan's surface. While the acetylene may undergo this reaction, it can also undertake several other multi-step synthetic schemes that eventually lead to the production of amino acids or other biologically important molecules. Four model synthetic schemes will be described, and their relevance in relation to prebiotic evolution on Earth is discussed.

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