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无生源说:蒙脱石形成脂质

我真正感兴趣的科学假设关于自然发生,特别是lipid-world假说。但是,我找不到信息的化学途径导致合成两亲性分子脂肪酸等。我已经能够发现它涉及矿物蒙脱石,使得步进式脂肪酸的形成使用一氧化碳(CO)和氢(H)。不过,我想知道确切的化学过程。谢谢!这里有一个链接到一个视频解释无生源说。注意:我简化了蒙脱石结构,只包括所涉及的部分(主要是非常消极的氧原子)

我的假设是这样的:如果烷烃是出现在地球上的海洋中,聚合脂肪酸通过链可能发生激进的加法。但是我不确定,最初的激进的将来自蒙脱石粘土颗粒。只是一个想法。

回答

好问题!以来的坚持我阅读关于克莱的传说中的作用提供脚手架早期有机分子在《科学美国人》的一篇文章中,从80年代末。多年后我遇到了一个诚意粘土科学家说“当然!”当我问她关于粘土在建立早期生活中所扮演的角色。无论如何……我怀疑分子吸引力和订购更多的司机而不是一个特定的化学过程(但我主张无知在这里)。我发现张幻灯片的演讲题为“[生命的化学演化理论的起源][1]”给州立大学石溪的天文学部门中,作者强调了粘土的化学属性表,即反对水晶镜面对称的脸。回想一下,这些表实际上是molecular-thin晶体彼此非常弱的债券,言外之意是,晶体表面本身是温和的指控为单体提供表面自动对齐:[![在这里输入图像描述][2]][2]每个物理分离这些晶体提供了相同的面孔之间对立的空白。这些面孔作为控股夹具水性单体行成脂质?作者实验室的结果证实了这一点。但是他没有提供细节,特别是催化发生。 It's worth noting that this (clay-based) process sounds almost exactly the reverse of chemical cracking of long-chain crude petroleum compounds in which naturally occurring molecular sieves are used to break bonds (and allow re-ordering of resultant fragments). From Wikipedia: > The catalytic cracking process involves the presence of acid catalysts (usually solid acids such as silica-alumina and zeolites) which promote a heterolytic (asymmetric) breakage of bonds yielding pairs of ions of opposite charges, usually a carbocation and the very unstable hydride anion. Carbon-localized free radicals and cations are both highly unstable and undergo processes of chain rearrangement, C-C scission in position beta as in cracking, and intra- and intermolecular hydrogen transfer. In both types of processes, the corresponding reactive intermediates (radicals, ions) are permanently regenerated, and thus they proceed by a self-propagating chain mechanism. The chain of reactions is eventually terminated by radical or ion recombination Here's another important paper that I wish I had more time to read: [Origins of life: From the mineral to the biochemical world][3], in which, among many other important things, the author writes, > One of these involves enantioselective adsorption on crystal faces. > Hazen et al. [13] have investigated the adsorption of the two forms of > an amino acid (aspartic acid) on well-defined faces of calcite > crystals. These faces themselves already possess the property of > chirality, i.e. the arrangement of atoms exposed on the surface is not > superimposable to its mirror image... This paper is a pretty good resource. This "brief guided tour through “mineral-based” prebiotic scenarios" is clear and the references likely complete, and it also highlights the role of clays in storing molecular information, as well as the role of metal sulfides in establishing (maybe) early metabolic reactions: [![enter image description here][4]][4] Let us know what you dig up! [1]: http://www.astro.sunysb.edu/lattimer/AST248/lecture_13.pdf [2]: https://i.stack.imgur.com/c1gyI.jpg [3]: https://www.bio-conferences.org/articles/bioconf/pdf/2015/01/bioconf-origins2015_00012.pdf [4]: https://i.stack.imgur.com/ZiWLw.jpg

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2017年5月25日在0:17吗

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