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托福听力练习-科学美国人60秒:37度刚刚好

2017-06-02 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：37度刚刚好

　　科学美国人60秒听力练习：37度刚刚好

　　科学美国人60秒英文文本

　　As a bitter winter storm rages on the east coast, it’s hard to knock being warm-blooded. But what about the metabolic cost of maintaining a high body temperature? Well, a new study finds that we and many other mammals keep up such a torrid temp because it’s a Goldilocks situation—98.6 is just right.

　　Albert Einstein College of Medicine researchers previously showed that every one degree Celsius rise in body temperature wards off about 6 percent more fungal species. So tens of thousands of fungi can infect reptiles and amphibians, but we can only be invaded by a few hundred fungi.

　　In the new work, the researchers created a mathematical model that weighed the fungal protection benefits versus the metabolic cost of high body temperature. And the optimal temperature was 98.1, quite close to what evolution figured out. The research was published in the open-access journal mBio. [Aviv Bergman and Arturo Casadevall, "Mammalian Endothermy Optimally Restricts Fungi and Metabolic Costs"]

　　Too low a temperature and we’re far more susceptible to fungal infections. Too high a temperature and we’d spend all our time taking in fuel to burn. So 98.6, like that middle bowl of porridge, is just right.

　　—Steve Mirsky

　　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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