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托福听力练习-科学美国人60秒:噬铁菌

2017-06-04 12:18:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：噬铁菌

　　科学美国人60秒听力练习：噬铁菌

　　科学美国人60秒英文文本

　　In the spring of 1912 an iceberg in the Atlantic took down the Titanic. Now, some humble bacteria are trying to finish the job. Scientists analyzing rust from the sunken ship have discovered a new species of microbe that eats iron. Their findings are described in the International Journal of Systematic and Evolutionary Microbiology. [Cristina Sánchez-Porro et al., "Halomonas titanicae sp. nov., a halophilic bacterium isolated from the RMS Titanic"]

　　Researchers have been studying the Titanic’s remains since they were discovered resting more than two miles beneath the ocean surface.

　　And they’ve found that the ship has been not-so-slowly disappearing. Visitors have removed artifacts, and the hull is festooned with rusticles: icicle-shaped accretions of iron oxide, otherwise known as rust.

　　Nearly 20 years ago scientists took samples of that rust, and found that it harbors a mix of iron-munching microbes. Now, analyzing the DNA of these organisms, researchers have catalogued more than two dozen strains of bacteria, including a new one they’ve dubbed Halomonas titanicae.

　　The bacteria are bad news for the Titanic, which may only last another 20 years, say the scientists. The good news is such bugs could be used to hasten the decay of other, less cinematic wrecks.

　　—Karen Hopkin

　　中文翻译请点击下一页

本文关键字: 托福听力 科学美国人60秒

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