- 默认语种:
- 播放器快捷键:
-
(F8:播放/暂停 F9:复读)
(F7:播放/暂停 F8:复读)
【科学60秒】口水揭秘你的年龄
听力简介:
Saliva contains many useful components. Lubricants. Enzymes for [--1--] food. And now, compounds that can reveal a person’s age. That’s according to a study in the journal Public Library of Science ONE.
During normal development, DNA in your body gets what’s called methylated. Small chemicals called methyl groups [--2--] the DNA, helping to determine which genes become active. But the patterns of methylation change as we grow older. Which was a clue that measuring methylation might give away age.
The researchers studied DNA in saliva contributed by 34 pairs of male [--3--], ages 21 to 55. They found 88 sites on the men’s DNA where the amount of methylation [--4--] their ages. The scientists next verified that finding in 60 men and women, ages 18 to 70.
Then they narrowed in on two genes that had the strongest age-related correlation. And using just that data, they found that they could estimate the ages of their saliva contributors to within five years.
This technique might help in crime scene investigations—recovered saliva could tell the age of a [--5--]. So if you’re worried about anyone knowing how old you are, be careful where you spit.
【视听版科学小组荣誉出品】
请在登录后才能看到内容!
请在登录后才能看到内容!
本文暂未收录注解!
参与沪友(已有71人听写,点击头像查看Ta的听写详情)
听写信息
生词本小D词典
相关网校
注意事项
- 听力练习标点符号不纳入正确率。
- 每天奖励上限为40沪元。
- 无听力原文时提交听写作为参考内容。
- 提交听写后根据正确率来奖励沪元。
- 获取听力mp3下载资源可选择相应下载方式。
- 程序校对,仅供参考,机器做不到人工智能,请大家谅解。