Cells can stop in their lifetime at some point in the cell cycle and persist for long periods of time.

细胞生命期可以停止在细胞周期的某个点,并保持很长时间

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Let me go back and finish up today by talking about the lifecycle of a virus.

让我回到病毒的生命周期这一话题,并以此作为今天的结尾

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That's the life cycle story.

这就是生命周期。

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Again, this is a highly simplified version of the lifecycle of a virus.

再看一下,这是一个高度简化版的,病毒生命周期示意图

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This is a life cycle of a particular class of viruses called retroviruses.

这里是称为逆转录病毒的一种特殊病毒的,生命周期

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That suggests, now, if you think about this even highly simplified lifecycle, suggests some other ways that we might use kind of modern technologies to engineer new vaccines.

那说明了,如果你,思考下这个高度简化的生命周期,那里隐含着其它一些突破口,即我们可以用某种现代技术,来构建新型疫苗

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So, one that perhaps does not reproduce in such high numbers that you create an overwhelming infection, but one that still goes through its lifecycle but is limited in its effect.

因此,一方面这些病毒不会大量复制,从而不会导致暴发性的感染,另一方面,它依旧在进行生命周期循环,只不过对其效用进行了限制

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It turns out in the case of Hepatitis B, the way the lifecycle proceeds-- the cells make too much of the protein and not all of it gets assembled into the virus.

结果显示,在乙肝的病案中,病毒生命周期的发展情况,细胞制造了大量的蛋白质,但并不是所有的蛋白质都会组合成病毒

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Hopefully their immune systems will respond to it like the real virus but it won't be capable of replication because we've chemically cross linked it so it can't go through its life cycle.

人体的免疫系统,就会对该病毒产生免疫应答,但灭活的病毒不能复制,因为我们已经对它做了化学处理,使它无法进入生命周期

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This picture here, we're going to come back to this later in two weeks when we start talking about vaccines, and we're going to talk about how you make vaccines for viruses and so in doing that we're going to think about the life cycle of a virus.

看这幅图片,我们两周之内还会讲到这一内容,在开讲疫苗的时候,我们要讲讲怎么制作病毒疫苗,那时我们要,讲讲病毒的生命周期

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They are RNA molecules but they have at some points in their life span, they have amino acids attached to them.

这些是如假包换的RNA分子,但在其生命周期的特定时间,它们会携带一个氨基酸分子

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You know that some viruses use RNA as their genetic material and so their lifecycle is going to be slightly different than this.

有些病毒利用RNA作为遗传物质,而且正因如此,它们的生命周期,会与前者有所不同

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