科学研究   常速英语

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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...

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It’s the end of an era, more than a billion kilometers from Earth this week as the Cassini spacecraft plunges to its fiery death in the clouds of Saturn. I’m Mike Lemonick. Lee Billings: And I’m Le...

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So I now have an animation to give you a flavor for not only the emergence from the pupal case but actually the locomotor activities, which are also affected. So here's a fruit fly in a tube, and that...

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Nice motile salmonella screaming along here *sound effects of airplane* here she comes! Boom! Ok it’s got a type 3 secretion system, squirts in proteins, triggers major event -here she comes, and *gul...

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The kidney filters an enormous amount of plasma, and in so doing, it has become the central site for the regulation of the ionic composition of the body. All of the ions such as sodium, potassi...

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Let's talk about what goes on at the single cell level. How does a gene for influenza hemagglutinin get into a human virus? And I've prepared a small video to show you how this goes. Before we roll th...

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Here's the virus particle with its envelope and proteins and genome. And you're going to see this represented as being within a pipette that's going to be dropped onto a petri dish containing human ce...

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So here we are with a view of the cochlea. The cochlea now uncoils, and we look at the basilar membrane, and now you'll see what happens when we play individual tones. Now a chord. And finally somethi...