| 2006年12月21日 Nature中英文摘要 | | 点击： 作者：51protocol收集 来源： 时间： 2007-03-13 本站论坛 |
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December 21, 2006
南极潮汐变化与冰流速度的关系
像南极洲的那种冰层会通过快速流动的冰流失区其大部分冰。Hilmar Gudmundsson对这样一个冰流中的流动情况进行了为期两个月的监测，它就是南极洲西部的拉特福德冰流。他所获得的发现是令人吃惊的：这里的表层流速在两个星期时间里波动高达20%，也许是受春季小潮为期两周的潮汐周期的影响。虽然将这些潮汐变化与冰流耦合到一起的机制尚不清楚，这些观测结果也说明，在有限时期内利用速度测量结果来推断流速长期变化是要谨慎的。
December 21, 2006
神经元启动活动势的启动点
不同神经元在其轴突上的不同点上启动其活动势，但这种现象在功能上有什么意义却不清楚。Kuba等人对一种鸟类的听觉系统中的神经细胞进行了专门研究：Nucleus laminaris是一种双耳重合探测器，是研究这一现象的一个很好的模型。他们发现，诱发靠近细胞体的活动势的神经元接听频率较低的声音。电脑模拟显示，活动势的启动点可能也是其他神经元进行重合探测的关键。
Contents
Editorials
Kyoto for commuters p971
Offset schemes are a small but potentially useful addition to the carbon balance sheet.
doi:10.1038/444971a
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Peer review and fraud p971
Two assessments of the refereeing process highlight challenges for journals.
doi:10.1038/444971b
Full Text | PDF (126K)
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Days of Futures past p972
It's a time of change for Nature's venture into speculative fiction.
doi:10.1038/444972a
Full Text | PDF (78K)
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Top of pageResearch Highlights
Research highlights p974
doi:10.1038/444974a
Full Text | PDF (272K)
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Top of pageNews
Climate credits p976
Why change your lifestyle when you can pay a company to save your greenhouse-gas emissions for you? Quirin Schiermeier investigates whether carbon offsetting can really save the planet.
doi:10.1038/444976a
Full Text | PDF (380K)
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Green activists enlist penguins to save the world p978
Environmentalists hail 'Happy Feet effect'.
Katie McGoldrick and Emma Marris
doi:10.1038/444978a
Full Text | PDF (225K)
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Gravity probe falters p978
Instrumentation problems leave relativity test in the balance.
Geoff Brumfiel
doi:10.1038/444978b
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Animal experiments under fire for poor design p981
Critics say trials do not translate well into human studies.
Jim Giles
doi:10.1038/444981a
Full Text | PDF (162K)
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Sidelines p982
doi:10.1038/444982a
Full Text | PDF (124K)
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NIH offers free access to wealth of disease data p982
Project aims to mine information on genotypes, phenotypes and lifestyle.
Gene Russo
doi:10.1038/444982b
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Correction p983
doi:10.1038/443983b
Full Text | PDF (168K)
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News in brief p983
doi:10.1038/444983a
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Top of pageNews
2006 Gallery: Brilliant display p985
From a jewel-like bird, rarer than any diamond, to the delicately poetic swirls generated inside aircraft engines, the pursuit of knowledge turns up its fair share of beauty. This issue, Nature wraps up the year with an arresting series of images from 2006. We've divided them into the art of the natural world, planet-scapes both domestic and extraterrestrial, and the splendour of modern technology. Just because something enhances our knowledge doesn't mean it can't also be bewitching.
Emma Marris
doi:10.1038/444985a
Full Text | PDF (3,079K)
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Top of pageBusiness
Better, faster - and easier to use p993
The Pentagon is sinking millions of dollars into developing the next generation of supercomputers — and plans to let non-military scientists and engineers share the benefits. Heidi Ledford reports.
doi:10.1038/444993a
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