光能促进胎儿眼睛发育-凯发k8官网

光能促进胎儿眼睛发育

文章来源：未知文章作者：enread 发布时间：2013-01-18 08:15 字体： [ ]　

(单词翻译:双击或拖选)

light passing through the body and into the womb has an important role in the developing eye, us researchers have discovered.

美国研究人员发现，光穿透人体进入子宫对于胎儿眼睛发育有重要作用。

a study, published in the journal nature, showed that mice spending ¹ in complete darkness had babies with altered eye development.

it indicated tiny quantities of light were needed to control blood ² growth in the eye.

the researchers hope the findings will aid understanding of eye ³.

light or dark?

if you could journey inside a mouse or a person, there would not be enough light to see. however, tiny quantities of light do pass through the body.

this effect has already been used to film an infection spreading through the body.

now scientists - at the university of california, san francisco, and cincinnati children's hospital medical center - believe that body-penetrating light can alter the development of the eye, at least in mice.

normally, a network of blood ⁴ known as the hyaloid vasculature is formed to help nourish the retina（视网膜） as it is constructed.

however, the blood vessels would disrupt sight if they remained, so they are later removed - like scaffolding from a finished building.

the researchers said this did not happen when the pregnancy was spent in total darkness.

the critical period was around 16 days - which is very late in mouse ⁵（酝酿，怀孕）, but corresponds to the first trimester in people.

"it's not something subtle here, it's a major effect on the way the retina develops that requires light going through the body," said prof richard lang, from cincinnati children's hospital.

he said it was a "huge surprise" that this was happening.

点击

收听单词发音

1
n.怀孕，怀孕期
参考例句：
early pregnancy is often accompanied by nausea.怀孕早期常有恶心的现象。 smoking during pregnancy increases the risk of miscarriage.怀孕期吸烟会增加流产的危险。

2
n.船舶；容器，器皿；管，导管，血管
参考例句：
the vessel is fully loaded with cargo for shanghai.这艘船满载货物驶往上海。 you should put the water into a vessel.你应该把水装入容器中。

3
n.混乱( disorder的名词复数 )；凌乱；骚乱；（身心、机能）失调
参考例句：
reports of anorexia and other eating disorders are on the increase. 据报告，厌食症和其他饮食方面的功能紊乱发生率正在不断增长。来自《简明英汉词典》 the announcement led to violent civil disorders. 这项宣布引起剧烈的骚乱。来自《简明英汉词典》

4
n.血管( vessel的名词复数 )；船；容器；（具有特殊品质或接受特殊品质的）人
参考例句：
the river is navigable by vessels of up to 90 tons. 90 吨以下的船只可以从这条河通过。来自《简明英汉词典》 all modern vessels of any size are fitted with radar installations. 所有现代化船只都有雷达装置。来自《现代汉英综合大词典》

5
n.怀孕；酝酿
参考例句：
the gestation period can be anything between 95 and 150 days.妊娠期从95天至150天不等。 this film was two years in gestation.这部电影酝酿了两年。