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WHAT IS LIFE? HOW MOLECULAR ASTROBIOLOGY AND SPACE EXPLORATION ARE BRINGING US CLOSER TO AN ANSWER

机译:生活是什么?分子天文学和空间探索如何使我们更加接近答案

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A physicochemical description of life and its emergence is one of the greatest open problems in science. Life is made of molecules described fundamentally by quantum theory. The identification of quantum effects in primitive organisms such as bacteria [1,2] has resulted in the successful application of open quantum systems models to energy and charge transfer processes in photosynthetic systems [3-5], as well as suggesting that an open quantum systems approach may contribute to an understanding of the processes by which primitive living systems emerge from the inanimate matter of which they are constituted. Improvements in observational techniques have resulted in the detection of over 150 species of organic molecules in our galaxy to date [6]. The detection of a range of molecules likely to be precursors of life in interstellar regions [7-9], suggests that the formation of the building blocks of life may be less rare than once imagined. Furthermore, a range of experiments have demonstrated the spontaneous generation of amino acids in diverse environments ranging from early Earth atmospheric analogues subjected to electric discharge [10], to interstellar ice analogues irradiated with UV light [11-13]. However, typically employed quantum chemical methods describing gas-phase phenomena cannot account for the variety of chemistry occurring in the interstellar medium (ISM), since a range of chemical processes take place on the surfaces of icy dust grains subject to incoming ultraviolet rays. Mathematical techniques from an open quantum systems approach will be useful for the theoretical study of the spontaneous generation of prebiotic molecules in the ISM, where a simple molecular system is strongly coupled to a low temperature interstellar icy environment and excited by incident UV radiation. Understanding the fundamental principles of the system-environment interaction resulting in the spontaneous formation of complex prcbiotic molecules would allow the prediction of which as yet undetected prcbiotic molecules could have formed in regions ranging from interstellar space to specific regions in our solar system, the characteristics of environments where such molecules emerge, as well as the investigation of the feasibility of new detections of specific prcbiotic molecular transitions in a given frequency range. We give an overview of an open quantum systems approach to the formation of prcbiotic molecules, a new theoretical advance, which would not be possible without ongoing ground-based observations of our galaxy, as well as flyby, sample return, robotic and potential crewed missions in our own solar system, providing data of the richness of chemistry occurring there.
机译:对生命及其出现的物理化学描述是科学中最大的开放性问题之一。生命是由量子理论从根本上描述的分子组成的。在细菌等原始生物中,量子效应的识别[1,2]已将开放量子系统模型成功应用于光合作用系统中的能量和电荷转移过程[3-5],并暗示了开放量子系统方法可能有助于理解原始生命系统从构成它们的无生命的事物中出现的过程。迄今为止,观测技术的改进已导致在我们的银河系中发现了150多种有机分子[6]。对星际区域中可能是生命先兆的一系列分子的检测表明,生命构建基团的形成可能比以前想象的要少。此外,一系列实验证明了在各种环境中氨基酸的自发生成,这些环境从早期经历放电的地球大气类似物[10]到用紫外线照射的星际冰类似物[11-13]。但是,描述气相现象的通常采用的量子化学方法不能解释星际介质(ISM)中发生的化学变化,因为在冰冷的尘埃颗粒表面上会受到入射紫外线的影响,因此发生了一系列化学过程。开放式量子系统方法的数学技术将对ISM中益生元分子自发生成的理论研究有用,在ISM中,简单的分子系统与低温星际环境紧密耦合,并受到入射紫外线辐射的激发。了解导致复杂的益生菌分子自发形成的系统与环境相互作用的基本原理,可以预测哪些尚未发现的益生菌分子可能已经形成了从星际空间到太阳系特定区域的区域,这种分子出现的环境,以及在给定频率范围内新检测特定细菌生物分子跃迁的可行性的研究。我们概述了形成益生菌分子的开放量子系统方法,这是一项新的理论进展,如果不对银河系进行持续的地面观测以及飞越,样本返回,机器人和潜在的载人飞行任务,这将是不可能的在我们自己的太阳系中,提供那里发生的大量化学物质的数据。

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