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arXiv 1906.08623astro-ph.EPphysics.chem-ph
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恒星环境中通过弱相互作用的氨基酸手性选择:生命起源的意义

Amino Acid Chiral Selection Via Weak Interactions in Stellar Environments: Implications for the Origin of Life

M. A. Famiano, R. N. Boyd, T. Kajino, T. Onaka, Y. Mo

摘要:

磁手征现象可能是流星环境中生物分子选择手征态的原因。例如,超新星氨基酸加工(SNAAP)模型先前被提出作为通过强磁场中的弱相互作用的方式对氨基酸进行磁手性选择的可能模式。在早期的工作中,该模型被证明产生的对映体过量(ee)高达0.014%的丙氨酸。本文介绍了分子量子化学计算结果,并由此确定了陨石中α-氨基酸加上异缬氨酸和正缬氨酸的$ee$。计算进行隔离和水的状态。在某些情况下,发现水性状态产生较大的$ee$,在合理条件下达到高达百分之几的值。

英文摘要:

Magnetochiral phenomena may be responsible for the selection of chiral states of biomolecules in meteoric environments. For example, the Supernova Amino Acid Processing (SNAAP) Model was proposed previously as a possible mode of magnetochiral selection of amino acids by way of the weak interaction in strong magnetic fields. In earlier work, this model was shown to produce an enantiomeric excess (ee) as high as 0.014% for alanine. In this paper we present the results of molecular quantum chemistry calculations from which $ee$s are determined for the alpha-amino acids plus isovaline and norvaline, which were found to have positive ees in meteorites. Calculations are performed for both isolated and aqueous states. In some cases, the aqueous state was found to produce larger $ee$s reaching values as high as a few percent under plausible conditions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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