54 lines
3.1 KiB
Markdown
54 lines
3.1 KiB
Markdown
+++
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title = "Big Bang Life"
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author = ["SouthFox"]
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date = 2024-06-11T22:23:00+08:00
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lastmod = 2024-06-11T23:58:39+08:00
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tags = ["publish"]
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draft = false
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<https://sites.google.com/view/sources-big-bang-life/>
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为[泛种论]({{< relref "../main/20240611222421-泛种论.md" >}})站台。
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## 为什么生命诞生是个奇迹？ {#为什么生命诞生是个奇迹}
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没有生命的物质如何成为有生命的物质到现在也是科学上的一大谜团，一个正常运作的基因组需要蛋白质，而要制造这些蛋白质，需要一个正常运作的基因组。
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蛋白质和基因组都是超长的分子，由相当复杂的小块组成，极难通过随机过程生成，成为了[鸡生蛋问题]({{< relref "../main/20240611222718-鸡生蛋问题.md" >}})（还是好几个）。
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\#Trefil, J. et al. (2009): “The Origin of Life”. American Scientist, vol. 97, 3.
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<https://www.americanscientist.org/article/the-origin-of-life>
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> The RNA molecule is too complex, requiring assembly first of the monomeric constituents of RNA, then assembly of strings of monomers into polymers. As a random event without a highly structured chemical context, this sequence has a forbiddingly low probability and the process lacks a plausible chemical explanation, despite considerable effort to supply one. We find it more natural to infer that by the time complex RNA was possible, life was already well on the road to complexity
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## 为什么生命有可能不诞生自地球？ {#为什么生命有可能不诞生自地球}
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大多数关于生命起源的理论试图通过理论解释一些原始的生命前分子汤如何有效地产生第一个自我复制的实体来解释这个差距。但我们还是不知道这到底是怎么回事
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\#Walker, S. I. (2017): “Origins of life: a problem for physics, a key issues review”. Reports on Progress in Physics, vol. 80, 9
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<https://iopscience.iop.org/article/10.1088/1361-6633/aa7804/meta>
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<http://www.esalq.usp.br/lepse/imgs/conteudo_thumb/Origins-of-Life---A-Problem-for-Physics--A-Key-Issues-Review.pdf> (open-access version)
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> These earliest fossils are examples of stromatolites,
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> mineral mounds created by microbial communities, which
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> are still found today in shallow, hypersaline waters, such as
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> in Shark Bay in Australia. Despite this antiquity, stromato-
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> lite communities are not representative of the first life; for-
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> mation of stromatolite mineral deposits requires cells with
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> advanced biomolecular machinery (inclusive of the capacity
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> for photosynthesis as cyanobacteria are important contribu-
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> tors to the formation of stromatolites): indicative of cellular
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> life with a complexity comparable to organisms alive today.
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> The early appearance of stromatolites in the fossil record
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> therefore places relatively tight constraints on the timescale
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> for the origin of life: life had to emerge early for evolution
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> to lead to such complex communities. Conditions became
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> habitable on Earth approximately 4 billion years ago (Bya):
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> life therefore had to emerge and evolve ‘modern’ cellular
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> complexity within a window of just a few hundred mil-
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> lion years.
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