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SSS 2011-11-15

时间:2011-12-02 06:01来源:互联网 提供网友:gmeng   字体: [ ]
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    (单词翻译:双击或拖选)

 This is Scientific American's 60-Second Science. I'm Christopher Intagliata. Got a minute? 

 
I've always thought that when I get a fever, it's my body trying to make things uncomfortable for the invading pathogen. And that's often true—higher temperatures can inhibit1 the bad guys' ability to replicate2. But my fever may actually be a one-two-punch. In addition to slowing down the invader3, the heat helps the immune system recruit more troops for a counter-attack. That finding appears in the Journal of Leukocyte Biology. 
 
Researchers warmed up one group of mice to body temperatures of about 103 degrees Fahrenheit4. They left another group at normal core temperature—about the same as ours. Then they injected both groups of mice with an antigen, a substance that attracts the attention of the immune system.
 
Blood samples taken three days later revealed that the feverish5 mice had nearly twice as many killer6 T cells: the kind of immune cells that can hunt down infected cells or tumor7 cells, and slaughter8 them.
 
So when you're sick and you get the chills, the authors say, your body may be trying to tell you to hop9 under some blankets. Lie down, warm up and send a message. The heat is on.
 
Thanks for the minute. For Scientific American's 60-Second Science, I'm Christopher Intagliata.

点击收听单词发音收听单词发音  

1 inhibit C7jxT     
vt.阻止,妨碍,抑制
参考例句:
  • Don't let ego and greed inhibit clear thinking and hard work.不要让自我和贪婪妨碍清晰的思维和刻苦的工作。
  • They passed a law to inhibit people from parking in the street.他们通过一项法令以阻止人们在街上停车。
2 replicate PVAxN     
v.折叠,复制,模写;n.同样的样品;adj.转折的
参考例句:
  • The DNA of chromatin must replicate before cell division.染色质DNA在细胞分裂之前必须复制。
  • It is also easy to replicate,as the next subsection explains.就像下一个小节详细说明的那样,它还可以被轻易的复制。
3 invader RqzzMm     
n.侵略者,侵犯者,入侵者
参考例句:
  • They suffered a lot under the invader's heel.在侵略者的铁蹄下,他们受尽了奴役。
  • A country must have the will to repel any invader.一个国家得有决心击退任何入侵者。
4 Fahrenheit hlhx9     
n./adj.华氏温度;华氏温度计(的)
参考例句:
  • He was asked for the boiling point of water in Fahrenheit.他被问到水的沸点是华氏多少度。
  • The thermometer reads 80 degrees Fahrenheit.寒暑表指出华氏80度。
5 feverish gzsye     
adj.发烧的,狂热的,兴奋的
参考例句:
  • He is too feverish to rest.他兴奋得安静不下来。
  • They worked with feverish haste to finish the job.为了完成此事他们以狂热的速度工作着。
6 killer rpLziK     
n.杀人者,杀人犯,杀手,屠杀者
参考例句:
  • Heart attacks have become Britain's No.1 killer disease.心脏病已成为英国的头号致命疾病。
  • The bulk of the evidence points to him as her killer.大量证据证明是他杀死她的。
7 tumor fKxzm     
n.(肿)瘤,肿块(英)tumour
参考例句:
  • He was died of a malignant tumor.他死于恶性肿瘤。
  • The surgeons irradiated the tumor.外科医生用X射线照射那个肿瘤。
8 slaughter 8Tpz1     
n.屠杀,屠宰;vt.屠杀,宰杀
参考例句:
  • I couldn't stand to watch them slaughter the cattle.我不忍看他们宰牛。
  • Wholesale slaughter was carried out in the name of progress.大规模的屠杀在维护进步的名义下进行。
9 hop vdJzL     
n.单脚跳,跳跃;vi.单脚跳,跳跃;着手做某事;vt.跳跃,跃过
参考例句:
  • The children had a competition to see who could hop the fastest.孩子们举行比赛,看谁单足跳跃最快。
  • How long can you hop on your right foot?你用右脚能跳多远?
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