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The Case for a Martian Origin for Earth Life

机译：地球生命的火星起源案例

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Classical prebiotic chemistry, which has for the last half century explored the reactivity of small organic molecules in glassware environments under the control of chemists, has left unanswered multiple paradoxes with respect to the origins of life. Many of these can be approached, and possibly solved, by placing organic molecular reactivity within the context of the rocks, minerals, hydrosphere, and atmosphere of a prebiotic earth. This new direction in prebiotic chemistry is discussed here, with special emphasis on the role of minerals in constraining the inherent propensity of carbohydrates to devolve to form unproductively complex mixtures of materials. We focus in particular on minerals containing the elements boron and molybdenum, which is produced in discontinuous synthesis model for the emergence of RNA as the first Darwinian molecule. Further, the role of desert environments to manage the "water paradox" is discussed in the context of many classes of processes that have been proposed to deliver RNA under prebiotic conditions. If current models are correct to suggest that early Earth may have been largely flooded at the time when life originated, Then those desert environments may not have been available. However, the inventory of water on Mars has always been less than on Earth and, as Kirschvink has pointed out, intercourse between the two planets was frequent during the time when life is emerging on either planets. This suggests that desert like environments may have been present on early Mars, if they were not present on early Earth.
机译：在过去的半个世纪中，经典的益生元化学一直在化学家的控制下探索玻璃器皿环境中有机小分子的反应性，但在生命起源方面却未解决多种悖论。通过将有机分子反应性置于益生元地球的岩石，矿物，水圈和大气环境中，可以解决甚至解决其中的许多问题。本文讨论了益生元化学的这一新方向，并特别强调了矿物质在限制碳水化合物固有的降解倾向以形成非生产性的复杂混合物方面的作用。我们特别关注含有硼和钼元素的矿物质，这些矿物质是在不连续合成模型中产生的，以使RNA作为第一个达尔文分子出现。此外，在提议在益生元条件下递送RNA的许多类过程的背景下，讨论了沙漠环境在管理“水悖论”中的作用。如果当前模型正确，表明生命起源时早期地球可能已经被洪水淹没，那么这些沙漠环境可能就不可用了。但是，火星上的水存量一直少于地球上的水量，而且正如基尔史文克指出的那样，在两个星球上都出现生命的时候，两个星球之间的交往很频繁。这表明，如果地球早期没有出现类似火星的沙漠环境。

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