20种生物氨基酸在浓硫酸中的稳定性：对金星云层宜居性的启示
Stability of 20 Biogenic Amino Acids in Concentrated Sulfuric Acid: Implications for the Habitability of Venus' Clouds
AI总结：
本研究测试了20种生物氨基酸在金星云层浓硫酸环境中的稳定性，发现19种氨基酸主链保持完整，表明浓硫酸溶剂可能支持生物化学过程，为金星云层宜居性提供了新证据。
摘要：
长期以来，科学家们一直推测金星潜在的宜居性，不是在其表面700K的高温下，而是在位于48-60公里高空的云层中，那里的温度与地球表面的温度相当。然而，普遍的观点认为，由于云层化学成分是浓硫酸——一种高度腐蚀性的溶剂，金星的云层无法支持生命。在这项工作中，我们研究了20种生物氨基酸在金星云层硫酸浓度范围（81%和98% w/w，其余为水）和温度下的行为。我们发现，在四周后，我们测试的20种生物氨基酸中有19种要么不反应（在98% w/w中有13种，在81% w/w中有12种），要么仅侧链发生化学修饰。因此，我们的主要发现是，氨基酸主链在浓硫酸中保持完整。这些发现显著拓宽了可能成为基于浓硫酸溶剂的生物化学组成部分的生物相关分子的范围。
英文摘要：
Scientists have long speculated about the potential habitability of Venus, not at the 700K surface, but in the cloud layers located at 48-60 km altitudes, where temperatures match those found on Earth's surface. However, the prevailing belief has been that Venus' clouds cannot support life due to the cloud chemical composition of concentrated sulfuric acid-a highly aggressive solvent. In this work, we study 20 biogenic amino acids at the range of Venus' cloud sulfuric acid concentrations (81% and 98% w/w, the rest water) and temperatures. We find 19 of the biogenic amino acids we tested are either unreactive (13 in 98% w/w and 12 in 81% w/w) or chemically modified in the side chain only, after four weeks. Our major finding, therefore, is that the amino acid backbone remains intact in concentrated sulfuric acid. These findings significantly broaden the range of biologically relevant molecules that could be components of a biochemistry based on a concentrated sulfuric acid solvent.
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