【Phat Yeti出品】60-SECOND SCIENCE 官方听力文稿 + 讨论帖 （更新至：2008.03.07）

豆豆～UID: 2378384

Dark Stars Bigger Than Solar Systems?

Heaven for deadheads: cosmologists have named a new theoretical object after the Grateful Dead classic, “Dark Star.” It’s the first stab at understanding how dark matter might have affected early stars.

No one knows what dark matter is composed of, so the scientists decided to go with a candidate called the neutralino. They think that neutralino interactions inside the first stars would have kept them bloated—big enough to engulf today’s solar systems. since the stars couldn’t collapse, they wouldn’t have ignited fusion—and that’s the whole point of a normal star.  Dark stars would still mainly be made of conventional matter, though, and would give off heat but no visible light.

If this paper in physical review letters is right, it would add a whole new phase to the evolution of stars. Dark stars might still be around today.  Or they might have collapsed to become regular stars or black holes. Like the Dead said, dark star crashes, pouring its light into ashes.

[ 本帖最后由 豆豆～ 于 2007-12-8 09:20 编辑 ]

深海lavenderUID: 2350207

今天刚回来,只能顶一次了.

buaa_wangchaoUID: 2179665

顶！

深海lavenderUID: 2350207

顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊
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非常勤勉地又来顶帖了.;d:

stuarterUID: 2339910

厚道

US-DreamerUID: 2402232

真的是很好的东东！
我的听力有提高哦！
顶顶顶！！！

sunny_hangzhouUID: 118188

学习听力的绝好材料!

多谢了!

weiweilovelyUID: 2393170

谢谢楼主~

buaa_wangchaoUID: 2179665

我顶～～～～～～～～～～～～～～～～～～～～～～～～～～

深海lavenderUID: 2350207

再顶再顶再顶再顶再顶再顶再顶.
期待更新ING.

深海lavenderUID: 2350207

8号的呢?豆豆不会弃楼了吧...................
顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊顶啊~~~~~

buaa_wangchaoUID: 2179665

周末没有的哇，patient

buaa_wangchaoUID: 2179665

音频出了，原稿还没有，再等等。

豆豆～UID: 2378384

:loveliness: :handshake

豆豆～UID: 2378384

Sperm Serves As Movement Model

Scientists hope to build nanoscale robots to deliver medicine to specific sites in our bodies. But supplying energy to the nanobots so that they can carry out these tasks is one of the stumbling blocks in developing the technology.  So researchers have turned to sperm.  Tiny sperm need plenty of energy to swim their way to their target.  And Alex Travis at Cornell University is trying to take advantage of what sperm do naturally for use in nanobots.

Sperm have two methods of creating energy.  Their mitochondria generate chemical energy.  But they can also break down glucose.  That process requires ten enzymes that attach to a sheath running down the sperm’s tail.  Travis and his team are trying to recreate that enzymatic process.  They’re developing enzymes that bind to nickel ions on a chip instead of to sperm.  So far, they’ve managed to attach three of the ten enzymes necessary.  And they’ve shown that the chip enzymes can act in a series.  If they can attach all ten, the nanobots could potentially use glucose in blood to swim their way to diseased cells.

[ 本帖最后由 豆豆～ 于 2007-12-10 23:39 编辑 ]