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It gets worse over time. The disease affects a small area of cells in the middle of the brain.
VOA: special.2009.04.07
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When cells become more like cells of the mature brain they're said to differentiate into brain cells.
当细胞变得越来越像成熟的脑细胞的时候,我们就称其为分化成了脑细胞
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We have tissues like the brain which are assembled to do functions that are different from any other groups of cells in the body.
像我们的脑组织,它们的功能,就截然不同于身体其他部分的细胞功能
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They used light-sensitive molecules to turn on and off nerve cells in the deep brain structure of mice.
VOA: special.2009.04.07
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If these 8 million people , would correspond to the number of neurons in the brain, the equivalent of the hair cells that you could get out of a single cochlea would be equivalent to one person walking down 42nd street.
如果这八百万人,相当于大脑中的神经元数量的话，能从一个耳蜗内取出的毛细胞,就好比是,第42大街上的某位行人。
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Research published mainly in nineteen seventy-three had found proteins on the surfaces of nerve cells in the brain.
VOA: special.2010.05.04
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If you go to the right region of an adult brain you might be able to find cells like this but it's more difficult.
如果你在一个成人大脑的正确区域找,你也许能找到这样的细胞,但会更困难一些
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The disease affects a small area of cells in the middle of the brain.
VOA: special.2009.02.03
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There's other viruses that infect cells of the brain, of the kidney, of the liver.
另外还有能感染脑细胞,肾细胞和肝细胞的病毒
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Evidence shows that extended periods of cortisol in the body weakens bones, damages nerve cells in the brain and weakens the body's defense system against disease.
VOA: special.2009.03.24
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If you look throughout the nervous system you would find cells that look different in different regions, because of where they're situated in the brain.
如果你仔细检视神经系统,你会发现不同部位的神经细胞,看起来不一样,这取决于它们在大脑中所处的位置
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However,brain cells of Alzheimer's victims die and are not replaced.
VOA: special.2009.09.15
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Some small subsets do but most of the cells in your brain don't proliferate and that's because they get trapped at one portion of the cell cycle.
除了很小一部分以外大部分脑细胞不增殖,这是因为,它们停滞于细胞周期的某个阶段
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Cells that are within the region that becomes the nervous system become less like the zygote and more like the cells of our brain, neurons and glia, and cells of the mature brain.
位于神经发育区中的细胞,变得越来越不像受精卵,而像脑细胞,神经细胞或神经胶质细胞等等,这些成熟的脑组织中细胞
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I digressed a little from this diagram but I think you've gotten the picture that as I move to more adult organisms, as I move to more specific regions of the brain, for example, I can still find progenitor cells that have some potential.
我不太认同这张图表,不过我认为随着我说到成人机体,你们已经在脑海中有这样的概念了,我在更特异性的区域,比如大脑中,仍能找到有一定潜能的祖细胞
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Now I isolated these cells maybe from the head region of the embryo, the region that's going to develop into the brain, so that would be a good place to look if you wanted cells that were going to develop into the brain.
现在我可以从胚胎的头部,分离这些细胞,从就要发育成为大脑的这些部位,这是取得你需要的细胞的绝佳位置,如果你想要发育成大脑的细胞的话
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Well, it would be useful because if I could take cells from the skin, find stem cells in the skin and then de-differentiate them so that they were now capable of becoming liver, or brain, or things that they're not going to become in their normal site, then that could be a very powerful tool for medicine.
这是因为,如果我能取一些皮肤细胞,找一些皮肤干细胞,并将它们去分化,那它们就能分化成肝脏,大脑或其他一些,它们原本分化不出来的细胞,这可以成为一个医学利器
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So how can cells, which have the same sort of master information DNA, in your brain, and your heart, and your kidney be so different?
那么为什么这些有同种DNA信息的细胞,在你的大脑里,你的心脏里,在你的肾里,表现的如此不同呢
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All of your cells have the same DNA, so the same genetic information, and yet cells in your brain, and cells in your heart, and cells in your kidney do very different things.
你所有的细胞都有相同的DNA,带有相同的遗传信息,尽管你大脑里的细胞,心脏上的细胞,肾里的细胞发挥着不同的功能
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