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2021-12-21   Video
How Coastal Communities Are Already Retreating from Rising Seas

Keywords:

As sea levels rise, hundreds of millions of people around the world will have to move to higher ground. The reality is that we can't hold back the water by surrounding ourselves with walls, and in...

随着海平面上升,数亿 的 人将不得不 移动到地势较高的地方。现实情况是 我们无法阻止水 用墙壁包围我们,并在 有些地方,洪水已经来了。 沿海社区努力适应 对上升的海平面开始做什么 曾经是不可想象的:撤退。但是什么 是否意味...


2021-12-17   Video
Mismatch Repair

Keywords:

There's a polymerase, a DNA polymerase, which copies both strands of the DNA, the top strand and the bottom strand. Sometimes those two strands are called Watson and Crick strands. But they're not per...

有一种聚合酶,一种 DNA 聚合酶,它可以复制 DNA 的两条链,即上链和下链。有时这两条链被称为 Watson 和 Crick 链。但正如我们刚才提到的,它们并不完美。有时他们会犯错。他们可能犯的错误是,你很快就会看到,掺入了错误的核苷酸...


2021-12-15   Video
How Can Scientists Help Make Cities More Sustainable

Keywords:

You’ve heard the numbers: More than half of the world’s people now live in cities, and in just a few decades more than two thirds of the globe’s rapidly growing population will be urban. Because citie...

您听说过这些数字:现在世界上一半以上的人口居住在城市,在短短几十年内,全球快速增长的人口中将有三分之二以上是城市人口。由于城市已经吸收了地球上的大部分资源并产生了大量废物,除非城市变得更加可持续,否则这些趋势可能会使地球变得悲惨。 研...


2021-12-13   Video
Ubiquitin and the Proteasome

Keywords:

So the little pink protein is ubiquitin and our yellow protein here is ataxin-1. For ubiquitin to be carried to proteins it needs a carrier, it's called the ubiquitin carrier enzyme. Once our ataxin h...

所以粉红色的小蛋白是泛素,而我们的黄色蛋白是共济失调素-1。为了使泛素被携带到蛋白质中,它需要一个载体,它被称为泛素载体酶。一旦我们的共济失调素发挥了它的功能并准备好被降解,另一种酶就会出现,一种连接酶,泛素连接酶就会出现并附着在它上面。连...


2021-12-09   Video
How Did Hawaii Form

Keywords:

Hawaii sits in the middle of the Pacific Ocean, and nowhere near the edge of a tectonic plate where volcanoes are usually found. So how did the island chain form, with all of its volcanoes? The islan...

夏威夷位于太平洋中部,远不及通常发现火山的构造板块边缘。那么,岛链及其所有火山是如何形成的呢? 岛链位于一个由加热岩石的地幔羽流推动的热点上。地幔底部的固体岩石被行星的核心加热。 那块炽热的岩石慢慢上升并推高地壳,形成一个凸起。 在那...


2021-12-07   Video
Relative Sizes of Bacteria and Viruses

Keywords:

But you also know that viruses are sub-microscopic. They're exceedingly small. Let me give you some sense of the scale that we're talking about here in more human terms. Let's imagine that I am...

但你也知道 病毒是亚微观的。 它们非常小。 让我给你一些 规模感 我们正在谈论的 在这里用更人性化的术语来说。 让我们想象一下我是 size 您体内的单个细胞。 在这个尺度上,如果我要 表示单个单元格, 一种 Bre...


2021-12-03   Video
Scientists Learn from a Fish School

Keywords:

Researchers train high-speed video on schooling fish to track the motion of each individual, revealing how information and decisions travel through the group. Collective behavior is embodied in swa...

研究人员在成群的鱼身上训练高速视频,以跟踪每个个体的运动,揭示信息和决策如何在群体中传播。 集体行为体现在成群的昆虫、成群的鸟、成群的羚羊和成群的鱼。在每一种情况下,个体在他们的环境中移动并几乎同时对威胁和机会做出反应,形成一个起伏的...


2021-12-01   Video
The Mammalian Biological Clock

Keywords:

To illustrate the role of the Per's (period) and Cry's (cryptochrome). So what we have here are BMAL and CLOCK which are the positive activators actually of a set of at least 5 genes. All three Per ge...

为了说明 Per's(句号)和 Cry's(cryptochrome)的作用。所以我们这里有 BMAL 和 CLOCK,它们实际上是一组至少 5 个基因的阳性激活剂。根据基因实验,所有三个 Per 基因和两个 Cry 基因似乎都受到 CLO...


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