• atmospheric production of glycolaldehyde under hazy prebiotic conditions

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 927
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     the early earth’s atmosphere, with extremely low levels of molecular oxygen and an appreciable abiotic flux of methane, could have been a source of organic compounds necessary for prebiotic chemistry. here, we investigate the formation of a key rna precursor, glycolaldehyde (2-hydroxyacetaldehyde, or ga) using a 1-dimensional photochemical model. maximum atmospheric production of ga occurs when the ch4:co2 ratio is close to 0.02. the total atmospheric production rate of ga remains small, only 1×107 mol yr − 1. somewhat greater amounts of ga production, up to 2 × 108 mol yr − 1, could have been provided by the formose reaction or by direct delivery from space. even with these additional production mechanisms, open ocean ga concentrations would have remained at or below ~1 μm, much smaller than the 1–2 m concentrations required for prebiotic synthesis routes like those proposed by powner et al. (nature 459:239–242, 2009). additional production or concentration mechanisms for ga, or alternative formation mechanisms for rna, are needed, if this was indeed how life originated on the early earth.

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