60s Science---From everyday collection to environmental protection, think Green!

阿泰UID：209473

听力、口语部分的专有名词 做适当补充

abdmenUID：2536727

您在考试中若遇到了准备过的难词告诉我们哈！

阿泰UID：209473

那个神经元 细胞核 文艺复兴啥的不都是难词吗:rolleyes:

frank_chowUID：2524907

阿泰原来是帮自己听写……不过有链接的，版友也可以下载……

阿泰UID：209473

:rolleyes: 难道你有意见不成？

wuwenlanUID：2491970

斑竹，我可以跟着来吗?????
或者接下来的工作，我应该怎么进行呢？？？？有什么好的提议吗


先thank you 一下

阿泰UID：209473

可以啊;d:

你看着有更新就可以按前面的模板来做

关键是要坚持下去，做到考试的那一天

这个是提高自己硬实力的东西，好好练

abdmenUID：2536727

原帖由 阿泰 于 2009-1-12 08:45 发表
那个神经元 细胞核 文艺复兴啥的不都是难词吗:rolleyes:

这些考过的就不用你说了吧:L

阿泰UID：209473

January 12, 2009  Judging A Book By Its Genomes
http://www.sciam.com/podcast/epi ... ts-genomes-09-01-12

Thousands of medieval European books survive to this day. Authors and scribes carefully handwrote the works on parchments made of animal skins. But the writers didn’t always bother to sign and date their works. So we had no way of knowing where and when most of the documents are from. Until now.

Researchers at North Carolina State University have demonstrated that they can reliably extract DNA samples from such parchments. Each manuscript offers up, they say, a wealth of genetic information, because as many as a hundred animals contributed skins for one book.

The scientists propose recording DNA data from all books for which we do have a reliable date and place of origin. These reference samples would create a DNA library of dates and locations. Then the mystery manuscripts could be compared against that DNA database.

The North Carolina investigators are presenting the technique for dating old manuscripts at the upcoming annual meeting of the Bibliographical Society of America. And they’re still working on improved techniques to harvest DNA while doing minimal damage to the original priceless parchments. A way to further illuminate those illuminating books.

难词： parchments  Bibliographical

阿泰UID：209473

January 13, 2009 Pterodactyls' Ptough Ptakeoffs

http://www.sciam.com/podcast/epi ... -ptakeoffs-09-01-13

A bird in flight is a thing of beauty. Even their takeoffs and landings usually look effortless. But pterodactyls? Well, that’s another story. Scientists have long assumed that pterodactyls, also called pterosaurs, flew just like birds, and launched themselves using their hind legs. Now a biologist at Johns Hopkins says that can’t be true. Instead, he says that pterosaurs needed all four limbs for liftoff.

Modern birds use their legs to launch and their wings to stay aloft. Once they’re in the air, their hind limbs are essentially payload, carried along for the ride. That arrangement presents a problem. A bird’s legs have to be muscular enough to get Tweety off the ground, but not so big that they drag him down. That limits how big a bird can be. Some pterosaurs, on the other hand, were the size of a giraffe. And looking at the bones of three different pterodactyl species, the Hopkins scientist concludes that there’s no way those legs were strong enough to get that bulk airborne. Instead, he says a pterosaur used all four limbs, leapfrogging forward on its knuckles, to propel itself into the air. Maybe not a thing of beauty. But it must have been something to see.

难词：giraffe

阿泰UID：209473

才想起来，这个TITLE的三个单词竟然全都不认识！:rolleyes:

mpromanusUID：2565872

第一个字是翼手龙，后面两个是为了押头韵（alliteration）弄出来的自造词。pterodactyl的第一个p字是不发音的，以此规则押头韵，加上后面两个字，读起来是terodactyl's tough takeoff，头韵押t，写起来是pterodactyl's ptough ptakeoff，头字押p。读写都能押上头韵，还因为首字不发音所以在听广播的角度来说完全不影响理解 - 是个很不错的文字游戏。

rose365UID：2281349

原帖由 mpromanus 于 2009-1-14 10:01 发表
第一个字是翼手龙，后面两个是为了押头韵（alliteration）弄出来的自造词。pterodactyl的第一个p字是不发音的，以此规则押头韵，加上后面两个字，读起来是terodactyl's tough takeoff，头韵押t，写起来是pterod ...

admire~~~

阿泰UID：209473

January 15, 2009 Getting a Teeny-Tiny Grip

http://www.sciam.com/podcast/epi ... -tiny-grip-09-01-15

Forget the scalpel, researchers at Johns Hopkins University have created a tool that can move easily through tissue, potentially making biopsies much less invasive. They call it a "microgripper." And the wireless, dust-particle sized device is able to grab single living cells from hard-to-reach places. Their report appeared in the online early edition of the Proceedings of the National Academy of Sciences.

The researchers assembled out of tiny metallic plates a "palm" with six three-jointed "fingers." This metal hand is truly tiny: just one-tenth of a millimeter in diameter. In the lab, scientists used magnets to pilot the microgripper through a tube of animal tissue and up to a living cell. Then, by applying heat as a trigger, the joints softened and the "fingers" closed around the cell.

The researchers hope the device will have applications beyond cell retrieval. It could be used to manufacture microchips or deliver medicine to specific locations in the body. But first, they must refine its motor skills. Right now, the microgripper can only grab—it can’t let go. And we're still years away from shrinking Raquel Welch to go in after it.

阿泰UID：209473

January 16, 2009 Mars Is Alive! (Geologically, Biologically or Both)

http://www.sciam.com/podcast/epi ... y-biologic-09-01-16

There’s definitely methane on Mars—and there are seasonal variations of how much is being released into the thin Martian atmosphere. Which means that Mars is still active geologically. Or that deep underground, something is or was alive. Or both. NASA and university scientists report the finding in the January 16th issue of the journal Science.

Researchers studying the Martian atmosphere discovered and measured methane levels over the last few years, using telescopes with infrared spectrometers. These instruments identify chemical compounds by analyzing their unique light absorption properties.

They found that Mars methane is being released as concentrated plumes at specific latitudes. Such plumes could come from various kinds of geological events. Underground bacterial communities could also be producing the methane. Or now-extinct living systems could have produced the methane long ago, with it only now being released through pores or fissures created by seasonal temperature variations.

On earth, 90 percent of the methane in the atmosphere comes from the biochemical activity of life. The rest is produced by geochemical processes. The Mars methane’s specific isotopic makeup could reveal whether its origins are biochemical or geological.