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SSS 2011-03-04

时间:2011-04-27 03:35来源:互联网 提供网友:geologyforget   字体: [ ]
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    (单词翻译:双击或拖选)

Every villain1 has his Achilles' heel. And microscopic2 scoundrels are no exception. The challenge for those who wish to ward3 off microbial bad guys is to identify that weak spot. Now, scientists studying the toxoplasmosis parasite4 think they've done just that. They share the secret in the Proceedings5 of the National Academy of Sciences.

The toxo parasite is similar to the one that causes malaria6. So finding a way to prevent these rogues7 from reproducing is high on researchers' to-do lists. The bugs8 are tricky9 to take down, in part because they're unpredictable in the way they multiply. Sometimes they get in and get busy making babies. Other times they copy their chromosomes10 but hold off parceling them out to their army of offspring until the time is right.

This flexibility11 has benefits, but it also has a drawback: the parasites12 have to keep track of their chromosomes…even as they change their minds about how and when to divvy them up. Now scientists have discovered a structure…unique to these parasites…that keeps their DNA13 in a tidy bundle through thick and thin. Find a drug that breaks that bundle, and we could destroy these parasites' devious14 plans.

Thanks for the minute. For Scientific American's 60-Second Science, I'm Karen Hopkin.


点击收听单词发音收听单词发音  

1 villain ZL1zA     
n.反派演员,反面人物;恶棍;问题的起因
参考例句:
  • He was cast as the villain in the play.他在戏里扮演反面角色。
  • The man who played the villain acted very well.扮演恶棍的那个男演员演得很好。
2 microscopic nDrxq     
adj.微小的,细微的,极小的,显微的
参考例句:
  • It's impossible to read his microscopic handwriting.不可能看清他那极小的书写字迹。
  • A plant's lungs are the microscopic pores in its leaves.植物的肺就是其叶片上微细的气孔。
3 ward LhbwY     
n.守卫,监护,病房,行政区,由监护人或法院保护的人(尤指儿童);vt.守护,躲开
参考例句:
  • The hospital has a medical ward and a surgical ward.这家医院有内科病房和外科病房。
  • During the evening picnic,I'll carry a torch to ward off the bugs.傍晚野餐时,我要点根火把,抵挡蚊虫。
4 parasite U4lzN     
n.寄生虫;寄生菌;食客
参考例句:
  • The lazy man was a parasite on his family.那懒汉是家里的寄生虫。
  • I don't want to be a parasite.I must earn my own way in life.我不想做寄生虫,我要自己养活自己。
5 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
6 malaria B2xyb     
n.疟疾
参考例句:
  • He had frequent attacks of malaria.他常患疟疾。
  • Malaria is a kind of serious malady.疟疾是一种严重的疾病。
7 rogues dacf8618aed467521e2383308f5bb4d9     
n.流氓( rogue的名词复数 );无赖;调皮捣蛋的人;离群的野兽
参考例句:
  • 'I'll show these rogues that I'm an honest woman,'said my mother. “我要让那些恶棍知道,我是个诚实的女人。” 来自英汉文学 - 金银岛
  • The rogues looked at each other, but swallowed the home-thrust in silence. 那些恶棍面面相觑,但只好默默咽下这正中要害的话。 来自英汉文学 - 金银岛
8 bugs e3255bae220613022d67e26d2e4fa689     
adj.疯狂的,发疯的n.窃听器( bug的名词复数 );病菌;虫子;[计算机](制作软件程序所产生的意料不到的)错误
参考例句:
  • All programs have bugs and need endless refinement. 所有的程序都有漏洞,都需要不断改进。 来自《简明英汉词典》
  • The sacks of rice were swarming with bugs. 一袋袋的米里长满了虫子。 来自《简明英汉词典》
9 tricky 9fCzyd     
adj.狡猾的,奸诈的;(工作等)棘手的,微妙的
参考例句:
  • I'm in a rather tricky position.Can you help me out?我的处境很棘手,你能帮我吗?
  • He avoided this tricky question and talked in generalities.他回避了这个非常微妙的问题,只做了个笼统的表述。
10 chromosomes 11783d79c0016b60332bbf1856b3f77d     
n.染色体( chromosome的名词复数 )
参考例句:
  • Chromosomes also determine the sex of animals. 染色体也决定动物的性别。 来自《简明英汉词典》
  • Each of four chromosomes divide longitudinally. 四种染色体的每一种都沿着纵向分裂。 来自《现代汉英综合大词典》
11 flexibility vjPxb     
n.柔韧性,弹性,(光的)折射性,灵活性
参考例句:
  • Her great strength lies in her flexibility.她的优势在于她灵活变通。
  • The flexibility of a man's muscles will lessen as he becomes old.人老了肌肉的柔韧性将降低。
12 parasites a8076647ef34cfbbf9d3cb418df78a08     
寄生物( parasite的名词复数 ); 靠他人为生的人; 诸虫
参考例句:
  • These symptoms may be referable to virus infection rather than parasites. 这些症状也许是由病毒感染引起的,而与寄生虫无关。
  • Kangaroos harbor a vast range of parasites. 袋鼠身上有各种各样的寄生虫。
13 DNA 4u3z1l     
(缩)deoxyribonucleic acid 脱氧核糖核酸
参考例句:
  • DNA is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。
  • Gene mutations are alterations in the DNA code.基因突变是指DNA密码的改变。
14 devious 2Pdzv     
adj.不坦率的,狡猾的;迂回的,曲折的
参考例句:
  • Susan is a devious person and we can't depend on her.苏姗是个狡猾的人,我们不能依赖她。
  • He is a man who achieves success by devious means.他这个人通过不正当手段获取成功。
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