科学研究   

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A common technique in genetic engineering is to insert a new gene into a loop of bacterial DNA called a plasmid. The molecular tool used to cut DNA is a restriction enzyme, such as Eco...

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Steve: So, the article is called, "Is Your Food Contaminated?". Is my food contaminated? Fischetti:Well, I hope not personally. However, there seems to be a greater chance that it could be or at leas...

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It's hard to get to space. As much as we all wish there were an easy, and affordable way to see our planet floating in the dark. Right now, the only way is to become an astronaut or a billionare. ...

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Nicholson: One of the center points of the book is this idea of neuroplasticity and neurogenesis, so I guess we should start by explaining what those are. Begley: Neuroplasticity means just what the ...

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In the last few decades, astronomers have discovered thousands of new worlds: exoplanets of all shapes and sizes, orbiting distant stars. But it seems that there was an undiscovered planet hidden...

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Walter: You know there is a famous or infamous quip, you know, that Scott McNeilly who was the founder and is the CEO of Sun Microsystems made a few years ago, and he said, "Privacy is dead, get over ...

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The millions of bases, which make up the human genome, are organized into structures called chromosomes. These are arranged into 22 matching pairs, plus one pair of sex chromosomes, con...

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Steve: Hi Professor Bell. How are you doing today? Bell: I am fine Steve. It's great to be here. Steve: Good to talk to you. So first of all, you are the leader of the Pancam Team on the planet Mars...