当前位置: X-MOL 学术Int. J. Astrobiol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Complex structures synthesized in shock processing of nucleobases – implications to the origins of life
International Journal of Astrobiology ( IF 1.7 ) Pub Date : 2021-05-26 , DOI: 10.1017/s1473550421000136
V. S. Surendra , V. Jayaram , M. Muruganantham , T. Vijay , S. Vijayan , P. Samarth , H. Hill , Anil Bhardwaj , N. J. Mason , B. Sivaraman

Nucleobases are nitrogenous bases composed of monomers that are a major constituent of RNA and DNA, which are an essential part of any cellular life on the Earth. The search for nucleobases in the interstellar medium remains a major challenge, however, the recent detection of nucleobases in meteorite samples and laboratory synthesis in simulated analogue experiments have confirmed their abiotic origin and a possible route for their delivery to the Earth. Nevertheless, cellular life is based on the interacting network of complex structures, and there is substantial lack of information on the possible routes by which such ordered structures may be formed in the prebiotic environment. In the current study, we present the evidence for the synthesis of complex structures due to shock processing of nucleobases. The nucleobases were subjected to the reflected shock temperature of 3500–7000 K (estimated) and pressure of about 15–34 bar for over ~2 ms timescale. Under such extreme thermodynamic conditions, the nucleobases sample experiences superheating and subsequent cooling. Electron microscopic studies of shock processed residue show that nucleobases result in spontaneous formation of complex structures when subjected to extreme conditions of shock. These results suggest that impact shock processes might have contributed to the self-assembly of biologically relevant structures and the origin of life.

中文翻译:

在核碱基的冲击处理中合成的复杂结构——对生命起源的影响

核碱基是由单体组成的含氮碱基,它们是 RNA 和 DNA 的主要成分,是地球上任何细胞生命的重要组成部分。在星际介质中寻找核碱基仍然是一项重大挑战,然而,最近在陨石样品中检测到的核碱基和模拟模拟实验中的实验室合成证实了它们的非生物起源以及它们向地球输送的可能途径。然而,细胞生命是基于复杂结构的相互作用网络,并且关于在益生元环境中形成这种有序结构的可能途径的信息非常缺乏。在目前的研究中,我们提出了由于核碱基的冲击加工而合成复杂结构的证据。核碱基经受 3500-7000 K(估计)的反射冲击温度和约 15-34 bar 的压力超过约 2 ms 的时间尺度。在这种极端的热力学条件下,核碱基样品经历过热和随后的冷却。冲击处理残渣的电子显微镜研究表明,当受到极端冲击条件时,核碱基会导致复杂结构的自发形成。这些结果表明,冲击冲击过程可能有助于生物相关结构的自组装和生命的起源。冲击处理残渣的电子显微镜研究表明,当受到极端冲击条件时,核碱基会导致复杂结构的自发形成。这些结果表明,冲击冲击过程可能有助于生物相关结构的自组装和生命的起源。冲击处理残渣的电子显微镜研究表明,当受到极端冲击条件时,核碱基会导致复杂结构的自发形成。这些结果表明,冲击冲击过程可能有助于生物相关结构的自组装和生命的起源。
更新日期:2021-05-26
down
wechat
bug