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

科学美国人60秒:过度冷却器官-托福听力下载

2017-01-04 12:08:23来源：科学美国人60秒

点击查看>>科学美国人60秒音频：过度冷却器官

　　科学美国人60秒中英文翻译：过度冷却器官

　　If you need a new liver, doctors have about twelve hours to transport it from a donor.

　　That ticking clock severely limits the ability of doctors to get organs to patients.

　　Now researchers have demonstrated a method that kept rat livers viable up to four days.

　　The scientists lowered the livers to below freezing temperatures, while flooding the tissue with antifreeze chemicals to prevent the formation of damaging ice crystals.

　　But such cooling alone is not sufficient, due in part to the liver's wide variety of cell types and functions.

　　So the researchers also used machine perfusion:

　　器官移植.jpg

　　as the livers were cooled they were flushed with solutions that kept them operational.

　　They were perfused again as they were brought back to above-freezing temps.

　　All the rats that were implanted with 3-day-old livers survived for three months.

　　Nearly 60 percent of the rats with four-day-old livers survived.

　　In contrast, no rats that received 3- and 4-day-old livers preserved by currently used methods survived.

　　This work is an early step toward creating a system that could work in humans, which would dramatically improve the chances of getting organs to people who desperately need them.

　　科学美国人60秒英文文本

　　中文翻译请点击下一页

本文关键字: 科学美国人60秒 科学60秒下载 托福听力

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