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SSS 2011-08-15

时间:2011-09-05 05:52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 Cynthia Graber. This will just take a minute.

 
Conventional poultry1 farms use antibiotics3 extensively, which contributes to the rise of antibiotic2-resistant4 pathogens. But farms that turn to organic practices, including a ban on antibiotics, can greatly reduce antibiotic-resistant bacteria within only the first year of the change. That's according to a new study in the journal Environmental Health Perspectives.
 
Scientists studied 10 conventional poultry farms and 10 large-scale newly organic poultry farms. They tested for the presence of enterecocci, microorganisms commonly found in both conventional and organic poultry farms. And they compared the bacteria's resistance to 17 antimicrobials. The researchers say they were surprised at how quick and precipitous was the fall in resistance.
 
Take Enterococcus faecalis: on the conventional farms, 67 percent were resistant to the antibiotic erythromycin, while only 18 percent were on the newly organic farms. And 42 percent of the same pathogen had a multidrug resistance on conventional farms, but that number dropped to 10 percent on the organic ones. The researchers expect drug-resistant bacteria levels to drop even further the longer a farm remains5 organic. Because if you're going to count chickens, it's a good idea to count bacteria too.
 
Thanks for the minute. For Scientific American’s 60-Second Science, I’m Cynthia Graber.

点击收听单词发音收听单词发音  

1 poultry GPQxh     
n.家禽,禽肉
参考例句:
  • There is not much poultry in the shops. 商店里禽肉不太多。
  • What do you feed the poultry on? 你们用什么饲料喂养家禽?
2 antibiotic KNJzd     
adj.抗菌的;n.抗生素
参考例句:
  • The doctor said that I should take some antibiotic.医生说我应该服些用抗生素。
  • Antibiotic can be used against infection.抗菌素可以用来防止感染。
3 antibiotics LzgzQT     
n.(用作复数)抗生素;(用作单数)抗生物质的研究;抗生素,抗菌素( antibiotic的名词复数 )
参考例句:
  • the discovery of antibiotics in the 20th century 20世纪抗生素的发现
  • The doctor gave me a prescription for antibiotics. 医生给我开了抗生素。
4 resistant 7Wvxh     
adj.(to)抵抗的,有抵抗力的
参考例句:
  • Many pests are resistant to the insecticide.许多害虫对这种杀虫剂有抵抗力。
  • They imposed their government by force on the resistant population.他们以武力把自己的统治强加在持反抗态度的人民头上。
5 remains 1kMzTy     
n.剩余物,残留物;遗体,遗迹
参考例句:
  • He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
  • The remains of the meal were fed to the dog.残羹剩饭喂狗了。
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