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SSS 2010-12-15

时间:2011-01-06 06:39来源:互联网 提供网友:tianshun   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 Karen Hopkin. This will just take a minute.

Rats have long been guilty of spreading disease. But now they've gone into the diagnosis1 side. Because rats can be trained to spot tuberculosis—and to do it better than conventional techniques. The finding is in the American Journal of Tropical Medicine and Hygiene2.

TB is the number-one infectious disease killer3 in the world. Early detection saves lives. But the most common way to diagnose TB, visually checking sputum samples for the microbe that causes the disease, requires sophisticated equipment and trained personnel. And it's not all that accurate.

That's where the rats come in. The critters are easy to train and can smell chemicals present with a TB infection. So scientists sent more than 20,000 sputum samples from 10,000 patients in Tanzania to be analyzed4 microscopically5. They then presented the same samples to the rats. The results: the fancy microscopes found about 13 percent of the patients to be TB-positive. The rats identified an additional 620 cases, boosting the detection rate by 44 percent.

That may not sound like much, but remember a person with TB can infect another dozen or so people over the course of a year. So that's more than 7,000 people that could be saved by a rat.

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 diagnosis GvPxC     
n.诊断,诊断结果,调查分析,判断
参考例句:
  • His symptoms gave no obvious pointer to a possible diagnosis.他的症状无法作出明确的诊断。
  • The engineer made a complete diagnosis of the bridge's collapse.工程师对桥的倒塌做一次彻底的调查分析。
2 hygiene Kchzr     
n.健康法,卫生学 (a.hygienic)
参考例句:
  • Their course of study includes elementary hygiene and medical theory.他们的课程包括基础卫生学和医疗知识。
  • He's going to give us a lecture on public hygiene.他要给我们作关于公共卫生方面的报告。
3 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。
4 analyzed 483f1acae53789fbee273a644fdcda80     
v.分析( analyze的过去式和过去分词 );分解;解释;对…进行心理分析
参考例句:
  • The doctors analyzed the blood sample for anemia. 医生们分析了贫血的血样。 来自《简明英汉词典》
  • The young man did not analyze the process of his captivation and enrapturement, for love to him was a mystery and could not be analyzed. 这年轻人没有分析自己蛊惑著迷的过程,因为对他来说,爱是个不可分析的迷。 来自《简明英汉词典》
5 microscopically b95eb0161484f1e40de775b8b54c545f     
显微镜下
参考例句:
  • Microscopically the ores are medium grained to amorphous. 显微镜下,矿石为中粒至非晶质。 来自辞典例句
  • He studied microscopically the statistics of trade. 他极仔细地研究了贸易统计数字。 来自辞典例句
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