SSS 2011-03-23
时间：2018-12-24 作者：英语课 分类：Scientific American(三)月
This is Scientific American's 60-Second Science. I'm Steve Mirsky. This will just take a minute.
Pregnant women shouldn't drink. It's become gospel, because of the danger of fetal alcohol spectrum 1 disorder 2. Alcohol can disturb the normal development of a fetus 3, leading to a lifetime of learning disabilities and social problems. But the percentage of children born with the disorder has remained constant, despite the warnings. And not all fetuses 4 of drinking mothers suffer.
Now research with rats has shown why some fetuses are naturally protected. Which could lead to ways to protect the vulnerable ones. The work is in the FASEB Journal.
The key is a gene 5 called Dio3, which governs the levels of thyroid hormone 6 in the brain. If mom passes on a normal Dio3, no problem. And a male fetus that inherits a problem Dio3 variation from mom but a normal Dio3 from dad should be okay. But alcohol can stop dad's normal Dio3 gene from working. Now mom's bad Dio3 allows the brain to be flooded with thyroid hormone, damaging the hippocampus.
The hope is that gene screening could ID women whose fetuses would be at-risk, and that dietary supplements or drugs could block alcohol's effect. And keep a child from suffering from a parent's addiction 7.
Thanks for the minute. For Scientific American's 60-Second Science, I'm Steve Mirsky.
- This is a kind of atomic spectrum.这是一种原子光谱。
- We have known much of the constitution of the solar spectrum.关于太阳光谱的构成，我们已了解不少。
- When returning back,he discovered the room to be in disorder.回家后，他发现屋子里乱七八糟。
- It contained a vast number of letters in great disorder.里面七零八落地装着许多信件。
- In the fetus,blood cells are formed in different sites at different ages.胎儿的血细胞在不同时期生成在不同的部位。
- No one knows why a fetus is not automatically rejected by the mother's immune system. 没有人知道为什么母亲的免疫系统不会自动排斥胎儿。
- DNA was extracted from fetuses at mid-gestation, about 10 days past conception. DNA从受孕大约10天后的中期妊娠胚胎中提取。 来自互联网
- Brucellosis is a disease that causes fetuses to abort in cattle. 普鲁士菌病是一种可以导致牲畜胎儿夭折的疾病。 来自互联网
- A single gene may have many effects.单一基因可能具有很多种效应。
- The targeting of gene therapy has been paid close attention.其中基因治疗的靶向性是值得密切关注的问题之一。