原文已被隐藏，你可用 快捷键 - 或点击 显示原文 按钮来查看原文
第1段
1 .This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?
该句暂无译文！
2 .When we look for life beyond Earth, we usually search for its chemical signatures.
该句暂无译文！
3 .The recent discovery of methane emissions on Mars, for example, is a possible sign of bacterial life.
该句暂无译文！
4 .But there is another way to detect life.
该句暂无译文！
5 .See if it moves.
该句暂无译文！
6 ."Everything moves.
该句暂无译文！
7 .I'm looking for something that I know that should be alive and does not move, but up to now I have not seen anything like this."
该句暂无译文！
8 .Giovanni Longo, a physicist at the ¨¦cole Polytechnique F¨¦d¨¦rale in Lausanne, Switzerland.
该句暂无译文！
9 ."It's extremely interesting, because it gives us a possible new definition of life if you want.
该句暂无译文！
10 .If it moves, then it's alive."
该句暂无译文！
11 .Longo and his colleagues studied the movements of bacteria, yeast, mouse, human and plant cells, using the nanosensor in an atomic force microscope.
该句暂无译文！
12 .And they found that every living cell they studied vibrated in tune with the metabolic processes going on inside.
该句暂无译文！
13 .When they altered bits of the cells' metabolism, the vibrations changed;
该句暂无译文！
14 .when they killed the cells in the sample chamber--the vibrations stopped.
该句暂无译文！
15 .The findings appear in the Proceedings of the National Academy of Sciences.
该句暂无译文！
16 .Using their nanosensor search technique, the researchers were able to detect the vibrations of life in soil and water samples, too.
该句暂无译文！
17 .So why not do the same thing on Mars?
该句暂无译文！
18 .An atomic force microscope has in fact already been sent there, on the Phoenix Lander, though it wasn't set up to do these types of analyses.
该句暂无译文！
19 ."But it can be done, so next time they can just modify it a little bit."
该句暂无译文！
20 .And in doing so - expand our suite of life-detecting tools.
该句暂无译文！
21 .Thanks for the minute, for Scientific American's 60-Second Science. I'm Christopher Intagliata.
该句暂无译文！