- 相关推荐
英语口语科学60秒
One of the ways the meek may inherit the Earth is by cheating death. The microscopic animal known as a water bear can spring back to life — even after being exposed to the vacuum and [ 1 ] radiation of space for more than a week.
At least that's what scientists found out when they sent the 1.5-millimeter-long creature into orbit in 2007. Nor are water bears alone. Some insect larvae, rotifers, nematodes and even brine shrimp can be seemingly dead for years, only to be revived by adding water. Sea monkeys [ 2 ].
Then there are the extremophiles. Deinococcus radiodurans may be the toughest. When high levels of ionizing radiation [ 3 ] this microorganism’s very DNA—killing it for all intents and purposes—its genetic code repairs itself and the organism comes back to life within hours. These hardy microbes would likely survive any apocalypse we throw at them.
Then there are the higher life forms. With hydrogen sulfide gas, mice can be put into a state of [ 4 ] animation that allows them to survive without breathing for up to six hours. This mammalian proof-of-concept offers hope that the technique could someday work with humans. Of course, the big problem with that experiment is finding volunteers.
【英语口语科学60秒】上海花千坊相关的文章:
英语口语精选08-23
英语口语08-26
经典的英语口语08-16
经典的英语口语精选07-29
经典英语口语02-23
英语口语:分别时的英语口语话语08-20
高考英语口语03-10
高考英语口语11-08
日常的英语口语02-08