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SSS 2010-09-07

时间:2010-10-08 03:28来源:互联网 提供网友:xn0006   字体: [ ]
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Always finding excuses to skip the gym? Congrats—you might be able to blame your genes1. Because the mere2 desire to exercise may be inherited, at least in mice. So says a study in the journal Proceedings3 of the Royal Society B.

The experiment started back in 1993 with 224 mice, divided into eight groups. In four of the groups, the researchers mated the males and females that logged the most distance on their exercise wheels. For the other four groups, they just randomly4 bred the mice.

Forty-three generations later, the mice descended5 from long distance runners are voluntarily running seven miles a day—three times as far as their lazy counterparts. And they cover those miles in different ways—some are marathoners, while others, especially females, run faster for fewer hours.

The running mice do have physical advantages, like better endurance and less body fat. But it's not just fitness. Previous studies suggest something's changing in the mice's brains too, turning them into exercise addicts6. And since mice and humans have similar genes, our itch7 to hit the track might also depend on how often mom and dad liked to throw on their running shoes.

Thanks for the minute for Scientific American’s 60-Second Science. I’m Christopher Intagliata.
 


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1 genes 01914f8eac35d7e14afa065217edd8c0     
n.基因( gene的名词复数 )
参考例句:
  • You have good genes from your parents, so you should live a long time. 你从父母那儿获得优良的基因,所以能够活得很长。 来自《简明英汉词典》
  • Differences will help to reveal the functions of the genes. 它们间的差异将会帮助我们揭开基因多种功能。 来自英汉非文学 - 生命科学 - 生物技术的世纪
2 mere rC1xE     
adj.纯粹的;仅仅,只不过
参考例句:
  • That is a mere repetition of what you said before.那不过是重复了你以前讲的话。
  • It's a mere waste of time waiting any longer.再等下去纯粹是浪费时间。
3 proceedings Wk2zvX     
n.进程,过程,议程;诉讼(程序);公报
参考例句:
  • He was released on bail pending committal proceedings. 他交保获释正在候审。
  • to initiate legal proceedings against sb 对某人提起诉讼
4 randomly cktzBM     
adv.随便地,未加计划地
参考例句:
  • Within the hot gas chamber, molecules are moving randomly in all directions. 在灼热的气体燃烧室内,分子在各个方向上作无规运动。 来自辞典例句
  • Transformed cells are loosely attached, rounded and randomly oriented. 转化细胞则不大贴壁、圆缩并呈杂乱分布。 来自辞典例句
5 descended guQzoy     
a.为...后裔的,出身于...的
参考例句:
  • A mood of melancholy descended on us. 一种悲伤的情绪袭上我们的心头。
  • The path descended the hill in a series of zigzags. 小路呈连续的之字形顺着山坡蜿蜒而下。
6 addicts abaa34ffd5d9e0d57b7acefcb3539d0c     
有…瘾的人( addict的名词复数 ); 入迷的人
参考例句:
  • a unit for rehabilitating drug addicts 帮助吸毒者恢复正常生活的机构
  • There is counseling to help Internet addicts?even online. 有咨询机构帮助网络沉迷者。 来自超越目标英语 第3册
7 itch 9aczc     
n.痒,渴望,疥癣;vi.发痒,渴望
参考例句:
  • Shylock has an itch for money.夏洛克渴望发财。
  • He had an itch on his back.他背部发痒。
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