关注微信领¥50

百门课程¥0元


50万+已关注

科学美国人60秒:肠道细菌互利关系-托福听力下载

2016-11-28 11:33:00来源:科学美国人60秒

点击查看>>科学美国人60秒音频:肠道细菌之间存在互惠互利关系

  科学美国人60秒中英文翻译:肠道细菌之间存在互惠互利关系

  科学美国人60秒英文文本

  It's one of the underwater world's classic partnerships:clownfish and Nemo hides out in the anemone, which helps keep predatory fish at bay.

  "But at the same time there are other fish species that will kind of nibble on the sea anemones, and the clownfish will actually go out and scare them away." Jeff Gore, a biophysicist at MIT.

  "So in this case there's across-protection mutualism between these two species in which they help to avoid predation."

  Such cross-protection is usually seen between two animals.

  But Gore studies the same sort of mutualism in microbes.

  He and his team demonstrated the first experimental example of that cross-protective relationship in drug-resistant microbes, using two strains of antibiotic-resistant E. coli bacteria:

  one resistant to ampicillin, the other to chloramphenicol.

  The researchers grew the bacteria together in a test tube, in the presence of both antibiotics.

  And rather than succumbing to the drugs, each bacterial strain deactivated one of the two antibiotics—thus protecting the other strain.

  That activity led to a stable coexistence over time.

  Which Gore says could in theory give the bugs an opportunity to swap resistance genes, through what’s called horizontal gene transfer—one bacterium donates genetic material to another.

  Any such transfer could make either or both strains individually resistant to both types of antibiotics.

  The findings are in the Proceedings of the National Academy of Sciences.

  The same story might play out in our guts, too—but it's too early to translate it into medical guidance.

  "It's always important to remember that just because we see a particular dynamic in the laboratory doesn't mean we should immediately go and change our clinical dosing practices.

  But then those sorts of results are then used as a guide for the kinds of phenomena that clinicians may want to watch out for in their circumstances."

  Cause the more we know about this bacterial buddy system, the better we may be at breaking it up if they team up against us.

  中文翻译请点 击下一页

为你特别匹配的托福超值课程,快速提分先人一步!
  • 新东方托福公益课(第8期)

    新东方托福公益课(第8期)

    1元10节直播干货,新东方明星教师团,每日社群打卡带练

    课时:10小时

    查看详情
  •  托福口语训练营

    托福口语训练营

    9次托福口语满分大神 带你学透托福6大题型

    课时:3.5小时

    查看详情
  • 大学生旗舰直达班 (冲110分)

    【知心托福】大学生旗舰直达班 (冲110分)

    适合人群:托福目标分数110分!

    课时:343

    查看详情
  • 大学生旗舰直达班 (冲100分)

    【知心托福】大学生旗舰直达班 (冲110分)

    适合人群:托福目标分数100分!

    课时:331

    查看详情
  • 大学生旗舰直达班 (冲90分)

    【知心托福】大学生旗舰直达班 (冲90分)

    适合人群:托福目标分数90分!

    课时:310

    查看详情
全部课程>>
单项突破
直播课堂

更多托福课程
新东方25年教学经验沉淀
托福考生必修课
托福考生,高效提分,安心之选

查看详情>>
更多>>
更多课程>>
更多>>
更多内容
更多>>
更多公开课>>
更多>>
更多课程>>