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  常速英语

2022-10-15   Video
Dengue Virus Life Cycle

Keywords:

Dengue virus is an RNA virus. Its outer surface is covered with envelope proteins surrounding a lipid bilayer envelope. Inside the envelope is a capsid shell that contains the virus’s RNA genome. Immu...

登革热病毒是一种 RNA 病毒。它的外表面覆盖着围绕脂质双层包膜的包膜蛋白。包膜内是一个衣壳,其中包含病毒的 RNA 基因组。免疫细胞是登革热病毒的目标。在登革热感染中,有两种细胞表面受体分子很重要。同源受体参与正常感染,而 FC 受体参与...


2022-10-13   Video
Do Robots Deserve Rights

Keywords:

Imagine a future where your toaster anticipates what kind of toast you want. During the day, it scans the Internet for new and exciting types of toast. Maybe it asks you about your day, and want...

想象一下,在未来,您的烤面包机会预测您想要什么样的吐司。 白天,它会在互联网上搜索新的和令人兴奋的吐司类型。 也许它会询问您今天的情况,并想聊聊吐司技术的新成就。 它会在什么层次上成为一个人? 这时你会问自己,你的烤...


2022-10-11   Video
Structure of Dengue Virus

Keywords:

Alright so now we're going to go into a little bit more detail on Dengue virus since it's once the subjects of our talk today. If you rotate it very carefully, I'm going to highlight for you the penta...

好了,现在我们将更详细地介绍登革热病毒,因为它曾经是我们今天演讲的主题。如果你非常小心地旋转它,我将为你突出显示每个顶点的五边形,所以它就在那里。如果你非常敏锐,你可以发现一个三重对称轴。这对应于每个三角形面的中心。现在,令人惊讶的是,整个...


2022-10-09   Video
What Research in Antarctica Tells Us about the Science of Isolation

Keywords:

It's just like a white desert for as far as you can see. There is absolutely nothing and you come back and it's overwhelming. Between 2016 and 2018 Dr Tim Heitland spent 14 months in antarctica ...

就像 一望无际的白色沙漠。 有 什么都没有,你回来了 这让人不知所措。 2016 年至 2018 年期间,Tim Heitland 博士 作为 一个 12 人的德国研究团队。 当他恢复正常生活时 毡 不同,我做的第一件事...


2022-10-07   Video
Lactose Digestion in Infants

Keywords:

Like all young mammals, human infants depend on milk for nutrition. Milk is rich in lactose, a disaccharide made from two sugar molecules. Lactose cannot be directly absorbed in the small intestine. T...

像所有年轻的哺乳动物一样,人类婴儿依赖牛奶获取营养。牛奶富含乳糖,这是一种由两个糖分子组成的二糖。乳糖不能在小肠中直接吸收。为了消化乳糖,哺乳动物会产生乳糖酶。现在乳糖与乳糖酶的活性位点结合。该酶水解乳糖并产生两种单糖,葡萄糖和半乳糖。然后...


2022-10-05   Video
Natural Selection for Lactose Tolerance

Keywords:

Mutations arise at random in a population. Suppose a mutation arises that causes adults to produce lactase in a population that doesn't have any dairy cows. Adults don't drink milk, so producing the l...

突变在群体中随机出现。假设出现突变,导致成虫在没有任何奶牛的种群中产生乳糖酶。成年人不喝牛奶,因此产生乳糖酶是浪费能源。突变丢失或仍然罕见。如果同样的突变发生在人们驯化奶牛的人群中,成年人可以喝牛奶而不会生病,并从牛奶中的糖分中获得能量。他...


2022-10-03   Video
Optimistic Nihilism

Keywords:

Human existence is scary and confusing. A few hundred thousand years ago, we became conscious and found ourselves in a strange place. It was filled with other beings. We could eat some; some cou...

人类的存在是可怕和令人困惑的。 几十万年前,我们开始清醒,发现自己在一个陌生的地方。 里面到处都是其他生物。我们可以吃一些;有些人可以吃掉我们。 有我们可以喝的液体;我们可以用来制造更多东西的东西。 白天的天空有一个...


2022-10-01   Video
Polymerase Chain Reaction (PCR)

Keywords:

Polymerase chain reaction-- or PCR-- uses repeated cycles of heating and cooling to make many copies of a specific region of DNA. First, the temperature is raised to near boiling, causing the double s...

聚合酶链反应 (PCR) 使用重复的加热和冷却循环来制作 DNA 特定区域的许多副本。首先,将温度升高到接近沸点,导致双链 DNA 分离或变性成单链。当温度降低时,短 DNA 序列(称为引物)与靶 DNA 序列上的互补匹配结合或退火。 ...


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