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第1段

1 .This is Scientific American 60-Second Science. I'm Cynthia Graber. This'll just take a minute.

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2 .The early Earth's oceans were home to a lot of interesting chemistry.

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3 .Now scientists have found that amino acids thought to be present way back when could have been cooked into other compounds vital for life,

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4 .an idea you should take with a grain of salt.

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5 .Four billion years ago, the planet was probably covered by a salty ocean, dotted with volcanic islands and short lived continents.

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6 .German researchers recently mimicked some of the chemistry taking place along the coasts of the volcanic islands.

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7 .They created an approximation of primordial seawater.

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8 .Then they evaporated it, to simulate what went on at those volcanic coasts.

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9 .They baked the residue, creating salt crusts.

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10 .At those high temperatures, amino acids interacted with metal ions in the salt crusts and were converted into other important biological molecules, such as pyrroles,

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11 .which are part of the structures of chlorophyll in plants and hemoglobin in animals.

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12 .The scientists presented their findings September 17th at the European Planetary Science Conference in Potsdam.

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13 .Over hundreds of thousands of years, these novel compounds could have built up along the volcanic coasts, creating materials for the first living cells.

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14 .Which were really worth their salt.

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15 .Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.

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