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

zhoushengyuanlyUID: 2246479

cong offer...你只是时间早晚的问题。。。不过话说回来，，再哪不是水;d:

zxj01UID: 2395442

好东西啊

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sunny_hangzhouUID: 118188

Palm's Magnificent Death May Save Its Life

Talk about a desperate cry for attention—a palm tree discovered inMadagascar literally flowers itself to death. At the end of its lifecycle, a pyramid of hundreds of tiny white flowers spring from the topof the tree. The flowers drip with nectar, announcing the palm’s swansong to swarms of birds and insects. Once pollinated, the tree sendsall remaining nutrients to its flowers as they develop into fruit. Thenit collapses and dies.

According to the Kew Royal Botanical Gardens in London, which announcedthe discovery, the tree also has a remarkable life. It stands fiftyfeet above the ground and has fan-shaped leaves that, at fifteen feetin diameter, rank among the largest of any flowering plant. It’sMadagascar’s most massive palm tree and can even be spotted on GoogleEarth. What’s more, DNA analysis shows it’s not just a new species, butan entirely new genus. This discovery comes right in time—fewer than ahundred of the palms still exist. Conservationists are now scramblingto find survivors and harvest seeds. Lucky for the tree, it puts on onecan’t-miss performance.

[ 本帖最后由 豆豆～ 于 2008-1-29 09:14 编辑 ]

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Mice Legs Longer With Batty Gene Regulation

When you hear things like: human DNA differs from chimp DNA by only a couple percent, you can’t help but wonder, how can that be? How can so few changes make such a big difference? Researchers working with fruit bats and mice think they have an answer. And it lies less in the animals’ genes than in the short snippets of DNA that control when and where and how vigorously genes are turned on.

If you’ve ever thought that a bat is basically just a rodent with wings, you’re not too far from the mark. One of the most obvious differences between bats and mice is their forearms. Mice have these stubby little legs, and bats have these large leathery wings. But even those differences are not as major as you might imagine. Mice and bats both have a gene called Prx1, which regulates limb development. But the gene is more active in the budding wings of bats. So the researchers took the piece of DNA that controls Prx1 activity from a bat and stuck it into a mouse. The result pictured in the January 15 issue of Genes and Development: mice that have longer front legs. Ok, they didn’t sprout wings, but the study shows that even small changes can have big consequences.

—Karen Hopkin

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好贴
最后四天的在第一个贴子里的页码是错的

深海lavenderUID: 2350207

回来了.
UP一下.

上天保佑我考的好...考的好...合爪祈祷下.
/|\

sunny_hangzhouUID: 118188

Genome-Based Medical Choices Draw Nearer

It’s the kind of thing we can look forward to more in the coming years: personalized drug regimens based on our individual DNA.  An example of this new kind of personalized medicine is illustrated by a study in the January 23rd issue of the Journal of the American Medical Association.  Researchers found that hypertension patients had better results with different drugs depending on the patient’s genetic profiles.  Currently, for the most part, doctors will put people with high blood pressure on a standard bp medication and see if it works.  If it doesn’t, they’ll try another drug, until this trial and error system finds a good one.  But genetic profiling could let physicians know immediately which patient will respond to which drug.

This study of genetics and bp meds included over 38,000 subjects with high blood pressure in the US and Canada who are taking part in a large multicenter trial.  With personalized genomic sequencing becoming affordable in the next few years, many of us should finally know in advance, not just our risks for disease, but what medications will be most effective.

[ 本帖最后由 豆豆～ 于 2008-1-29 09:15 编辑 ]

10405zyUID: 2188360

好东东！

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skyinthesunUID: 2409220

这个下载不了啊 ？？

深海lavenderUID: 2350207

试试看早上人少的时候下.

深海~UID: 2443961

MJ来顶下.;d: