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[科学美国人60秒] SSS 2020-02-20

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[科学美国人60秒] SSS 2020-02-20

SSS 20200220

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60秒科学节目(SSS)是科学美国人网站的一套广播栏目,英文名称:Scientific American - 60 Second Science,节目内容以科学报道为主,节目仅一分钟的时间,主要对当今的科学技术新发展作以简明、通俗的介绍,对于科学的发展如何影响人们的生活环境、健康状况及科学技术,提供了大量简明易懂的阐释。

Tune in every weekday for quick reports and commentaries on the world of science-- it will just take a minute.


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HOMEWORK
They said that Marie Antoinette’s hair turned white the night before she lost her head to the guillotine. But can stress really have such a dramatic effect on hair color? A new study on mice concludes that it can and credits over active nerves with stripping the color from the animal’s _ and possibly heirs. Researchers at Harvard Stem Cell Institute were interested in the stress and hair color issue. So they decided to take a closer look to at the stem cells that give rise to melanocytes the cells that pump pigments into each hair follicle. The stem cells were an obvious target.
Because changes in the stem cell population translate to changes in hair color, which are very visible and easy to identify.
Yajie Su, the study’s senior author, to start, she and her colleagues subjected mice to some rodenticide stressors, like having their cage _, their bed dampened or their lights left on all night.
So what do we find? We found that stress indeed leads to premature hair grey in mice. But it took a long time for us to actually narrow down how it occurs.
First, they thought it could be the immune system attacking melanocytes stem cell population. However, mice lacking immune cells still show premature hair grey under stress. Then, they thought the key factor could be cortisone, the _ stress hormone. But when we removed the adrenal glands from the mice so that they cannot produce cortisone like hormones. Their hair still turned grey under stress. Not when they turned their attention into the sympathetic nervous system, which orchestrates the body’s overall reaction to stress including the classic fight-or-flight response. Those nerves reach out to our muscles, organs, and yes, even our hair. The nerve terminals wrap around each hair follicle like a ribbon. And when Su and her team cut those connections, the stem cells were spared, the animals kept their shiny black coat even in the face of minor discomfort. The findings appear on the Journal NATURE. It’s unclear whether of the same the sympathetic nerves make us grey as we age but the results provide hope that we may someday be able to fight, to hold on to our natural hair color, and avoid that _ with _ to the hair dresser.
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They said that Marie Antoinette’s hair turned white the night before she lost her head to the guillotine. But can stress really have such a dramatic effect on hair color? A new study on mice concludes that it can and credits over active nerves with stripping the color from the animal’s locks and possibly heirs. Researchers at Harvard Stem Cell Institute were interested in the stress and hair color issue. So they decided to take a closer look to at the stem cells that give rise to melanocytes the cells that pump pigments into each hair follicle. The stem cells were an obvious target.
Because changes in the stem cell population translate to changes in hair color, which are very visible and easy to identify.
Yajie Su, the study’s senior author, to start, she and her colleagues subjected mice to some rodenticide stressors, like having their cage tilted , their bedding dampened or their lights left on all night.
So what do we find? We found that stress indeed leads to premature hair grey in mice. But it took a long time for us to actually narrow down how it occurs.
First, they thought it could be the immune system attacking melanocytes stem cell population. However, mice lacking immune cells still show premature hair grey under stress. Then, they thought the key factor could be cortisone, the _ stress hormone. But when we removed the adrenal glands from the mice so that they cannot produce cortisone like hormones. Their hair still turned grey under stress. Not when they turned their attention into the sympathetic nervous system, which orchestrates the body’s overall reaction to stress including the classic fight-or-flight response. Those nerves reach out to our muscles, organs, and yes, even our hair. The nerve terminals wrap around each hair follicle like a ribbon. And when Su and her team cut those connections, the stem cells were spared, the animals kept their shiny black coat even in the face of minor discomfort. The findings appear on the Journal NATURE. It’s unclear whether of the same the sympathetic nerves make us grey as we age but the results provide hope that we may someday be able to fight, to hold on to our natural hair color, and avoid that _ with _ to the hair dresser.
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Homework
They said that Marie Antoinette’s hair turned white the night before she lost her head to the guillotine...?But can stress really have such a dramatic effect on hair color? A new study on mice? concludes that it can and credits over active ...?with stripping the color from the animal locks
and possibly hears? Researchers at Harvard Stem Cell Institute were interested in the stress and hair color issue. So they decided to take a closer look to at the stem cells that give rise to melanocycle? the cells that pump pigments into each hair follicle. The stem cells were an obvious target.
Because changes in the stem cell population translate to changes in hair colour, which are very visible and easy to identify.Yajie Su, the study’s senior author, to start, she and her colleagues subjected mice to some radentent stresser, like having their hair cage,bedding dampened or their lights left on all night.
So what do we find? We found that stress indeed leads to premature? hair grey in mice. But it took a long time for us to actually narrow down how it occurs.
First, they thought it could be the immun? system attacking melanocytes stem cell population. However, mice lacking immune cells still show premature? hair grey under stress. Then, they thought the key factor could be cortisone...? But when we removed the adrenal glands from the mice so that they cannot produce cortisone like hormones. Their hair still turned grey under stress. Not when they turned their attention into the sympathetic nervous system, which orchestrates?the body’s overall reaction to stress including the classic fight-or-flight response. Those nerves reach out to our muscles, organs, and yes, even our hair. The nerve terminals wrap around each hair follicle like a ribbon. And when Su and her team cut those connections, the stem cells were spared, the animals kept their shiny black coat even in the face of minor discomfort. The findings appear on the Journal NATURE. It’s unclear whether of the same the sympathetic nerves make us grey as we age but the results provide hope that we may someday be able to fight, to hold on to our natural hair color, and avoid that _ with _ to the hair dresser.
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