VOA常速英语:胡须里的细菌或帮助开发新抗生素
教程:2016年02月VOA常速英语  浏览:1276  
  • 00:00/00:00
  • 提示:点击文章中的单词,就可以看到词义解释
    Widespread use of antibiotics for conditions that don't require them has spurred mutations in bacteria strains, turning them into so-called superbugs.

    As a result, some of the diseases that once were easily treatable with antibiotics, such as pneumonia and kidney infections, are becoming deadly again. But a recent lab test in Britain showed that men's facial hair is teeming with a variety of bacteria, all fighting for survival. Some of them produce substances with antibiotic properties.

    "So from 20 beards we managed to isolate at least a hundred different isolates from them, and around 25 percent of these showed antibiotic activity against our indicator strain,” said Adam Roberts, senior lecturer in microbial diseases at University College London.

    The research at University College London was spurred by media reports saying that there are more germs in a man's beard than on a toilet seat. These sparked a debate on whether beards are good or bad for men's health.

    "We wanted to either disprove or prove that that was actually correct, and we could find no evidence of that. So we have no real conclusion to say that beards are bad for you. Likewise, we can't really say that they're good for you,” Roberts said.

    Drug-resistant strains

    But the tests showed that certain species of bacteria produce toxins that kill other bacteria, in one case even a particularly drug-resistant strain of E. coli, which can cause deadly diseases.

    The finding is crucial at a time when existing antibiotics are less and less effective, and new ones have not been discovered. Scientists say they are testing bacteria from various sources.

    "So we don't need any more beards. And we've got other samples from all over the country -- from child's trampolines, to fridges, to cats. We've now got a selection of around 50 different bacteria which can kill multiple indicator strains,” he said. “These include E.coli -- a multi-drug-resistant E.coli -- from a urinary tract infection. These include also Candida albicans [yeast infections] and MRSA [Methicillin-resistant Staphylococcus aureus]."

    But don't expect a new miracle drug anytime soon. Scientists warn that properly testing and purifying a novel antibiotic is a long and expensive process, riddled with failures.

    0/0
      上一篇:VOA常速英语:小男孩用塑料袋自制梅西球衣 成网络名人 下一篇:查看所有《2016年02月VOA常速英语》

      本周热门

      受欢迎的教程

      下载听力课堂手机客户端
      随时随地练听力!(可离线学英语)