星間塵環境における有機物生成の定量的検討

概要

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Abiotic formation of amino acid precursors in ice mantles of interstellar dusts was quantitatively estimated for the first time through laboratory simulation. Mixtures of carbon monoxide (or methane, or methanol), ammonia and water were irradiated with protons, electrons or gamma-ray. Amino acid precursors, which gave amino acids such as glycine after acid-hydrolysis, were detected in each product. Using the G-values of glycine experimentally obtained, G-value of glycine in ice mantles of interstellar dusts, whose major components were water, carbon monoxide and ammonia (100:10:1) was estimated as ca. 6×10^<-6>. It is suggested that comets, aggregates of interstellar dusts, contain ca. 20nmol/cm^3 of glycine precursors. Bioorganic compounds delivered to the primitive earth by comets or their fragments (interplanetary dusts) are quite important sources for building blocks of the first life on earth, as well as endogenous bioorganic compounds.
日本地球化学会の論文
1997-08-04