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SSS 2009-08-07

时间:2010-05-18 05:59来源:互联网 提供网友:mark@li   字体: [ ]
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    (单词翻译:双击或拖选)

A friend’s four year old daughter recently complained to me about how badly her mosquito bite itched2. She was about to burst into tears. The fact that an uncomfortable itchy sensation can drive many of us to distraction3 led many scientists to believe that the nervous system deals with itch1 much as it does pain. Others spent years looking, unsuccessfully, for neurons that tell us to scratch rather than that we just hurt.

 

Now, according to a study in the August 7th issue of the journal Science, researchers say they’ve finally found specific itch neurons in mice. They located them in the mouse spinal4 cord by following up on previous research that showed that some mice respond to itchy stimuli5 more than others.

 

When scientists knocked out the itch neurons, the mice no longer had the urge to scratch in response to known itchy stimulus6. But they could still sense and avoid pain, showing that itch and pain are processed independently.The researchers hope that these findings could eventually lead to better treatments for chronic7 itch, by targeting the specific biochemical pathways involved. As for the four-year-old? She forgot about her itchy bug8 bite as soon as lunch arrived.

 


点击收听单词发音收听单词发音  

1 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。
2 itched 40551ab33ea4ba343556be82d399ab87     
v.发痒( itch的过去式和过去分词 )
参考例句:
  • Seeing the children playing ping-pong, he itched to have a go. 他看到孩子们打乒乓,不觉技痒。 来自《现代汉英综合大词典》
  • He could hardly sIt'still and itched to have a go. 他再也坐不住了,心里跃跃欲试。 来自《现代汉英综合大词典》
3 distraction muOz3l     
n.精神涣散,精神不集中,消遣,娱乐
参考例句:
  • Total concentration is required with no distractions.要全神贯注,不能有丝毫分神。
  • Their national distraction is going to the disco.他们的全民消遣就是去蹦迪。
4 spinal KFczS     
adj.针的,尖刺的,尖刺状突起的;adj.脊骨的,脊髓的
参考例句:
  • After three days in Japan,the spinal column becomes extraordinarily flexible.在日本三天,就已经使脊椎骨变得富有弹性了。
  • Your spinal column is made up of 24 movable vertebrae.你的脊柱由24个活动的脊椎骨构成。
5 stimuli luBwM     
n.刺激(物)
参考例句:
  • It is necessary to curtail or alter normally coexisting stimuli.必需消除或改变正常时并存的刺激。
  • My sweat glands also respond to emotional stimuli.我的汗腺对情绪刺激也能产生反应。
6 stimulus 3huyO     
n.刺激,刺激物,促进因素,引起兴奋的事物
参考例句:
  • Regard each failure as a stimulus to further efforts.把每次失利看成对进一步努力的激励。
  • Light is a stimulus to growth in plants.光是促进植物生长的一个因素。
7 chronic BO9zl     
adj.(疾病)长期未愈的,慢性的;极坏的
参考例句:
  • Famine differs from chronic malnutrition.饥荒不同于慢性营养不良。
  • Chronic poisoning may lead to death from inanition.慢性中毒也可能由虚弱导致死亡。
8 bug 5skzf     
n.虫子;故障;窃听器;vt.纠缠;装窃听器
参考例句:
  • There is a bug in the system.系统出了故障。
  • The bird caught a bug on the fly.那鸟在飞行中捉住了一只昆虫。
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