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火山爆发中扮演了一个重要的角色在生命起源的科学家说

Jeffrey Bada holds a preserved sample containing amino acids created by a 1958 experiment done by his mentor Stanley Miller。 (c) Scripps Institution of Oceanography, UC San Diego。

In 1953, chemists Harold Urey and Stanley Miller conducted one of the most famou****periments of the past century, commonly known as the primordial soup, in which they tried to find out how the first sings of life on Earth surfaced by exposing a mix of gases to a lightning-like electrical discharge to create amino acids。 Amino acids are very important because they form proteins, which, in turn, form cellular structures and control reactions in living things。

Five years later, in 1958 Miller tried another variation to hi****periment by adding to his initial variant hydrogen sulfide, which is spewed by volcanoes。 For some reason, the chemist never got around to analyze his results and for last five decades the vile has been shelved away。 Jeffrey Bada, Miller’;s former student and a Scripps Institution of Oceanography, UC San Diego professor of marine chemistry, discovered the hydrogen sulfide variant of the experiment in Miller’;s old lab after he inherited it (Miller passed away in 2007) and analyzed the data with modern equipment and techniques。

The results were remarkable! While Miller’;s initial famou****periment concluded the mixture will turn up five organic molecules (amino acids), but the hydrogen sulfide compound combined with light delivered a staggering number of promising molecules: 23 amino acids and four amines, another type of organic molecule。 This suggests that volcanic eruptions coinciding with lightning may have played a role in synthesizing a large number of crucial life molecules, and that there may have been a much more abundant variety of organic compound in the early Earth than scientists initially believed。

“;Much to our surprise the yield of amino acids is a lot richer than any experiment [Miller] had ever conducted,”; says Bada。

Another remarkable finding is that the amino acids in the hydrogen sulfide experiment very much resembles the ones found in asteroids, according to Bada。

本文源自: 环亚娱乐游戏

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