课程咨询

托福考试网 托福资料下载 托福资讯 0元讲座 水平测试

托福考试练习
新东方在线 > TOEFL > 托福听力 > 正文
托福培训

扫码免费领资料

内含托福全科备考资料

更有免费水平测试及备考规划

托福培训

扫码关注掌握一手留学资讯

回复XDF免费水平测试

录播精讲 直播课HOT

托福听力练习-科学美国人60秒:贴纸帮助检测沙门氏菌

2017-02-20 17:33:00来源：网络

点击查看>>科学美国人60秒音频：贴纸帮助检测沙门氏菌

　　科学美国人60秒中英文翻译：贴纸帮助检测沙门氏菌

　　科学美国人60秒英文文本

　　When I say “salmonella,” what comes to mind?

　　Eggs? Chicken? Actually, think carrots, cucumbers, cantaloupes.

　　It’s foods we eat raw that tend to cause the biggest salmonella outbreaks.

　　But an invention by physicists at Auburn University could make testing for bacteria as simple as slapping on a sticker and waving a handheld scanner.

　　The sticker part of the system contains a tiny sliver of metallic glass.

　　The side touching the food is coated with phage E2, a virus engineered to stick only to Salmonella typhimurium bacteria.

　　In the handheld scanner, a small wire coil creates an oscillating magnetic field, which makes the glass sliver in the sticker vibrate in sympathy.

　　The coil can measure that rate of vibration.

　　If salmonella is present under the sticker, it gets snagged by the phage and makes the sticker a touch heavier—enough to change its vibration frequency.

　　The scanner could pick up the shift and sound an alarm.

　　The work appears in the Journal of Applied Physics.

　　The system should work on most produce—but probably not on chicken or eggs, because they can harbor salmonella on the inside.

　　中文翻译请点击下一页

本文关键字: 托福听力练习 科学美国人60秒

上一页 1 2 下一页

托福辅导

关注新东方在线托福

托福机经·Official题目练习

考前重点突破·听说读写海量资料

更多资料

关注新东方在线托福，
回复【XDF】获取大礼包

托福辅导
  • 1.打开手机微信【扫一扫】，识别上方二维码；
  • 2.点击【添加】，回复对应关键字领取学习资料。
更多>>
更多内容

免费获取托福备考大礼包

微信扫描下方二维码 立即领取

托福辅导
更多>>
更多公益讲座>>
更多>>
更多资料
托福TPO 托福听力练习 托福口语练习 托福阅读练习 托福写作练习
我要
反馈 返回
首页
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10