报告：Anticipatory Reproduction and Population Growth in Seed Predators, Stan Boutin, et al.
太阳系结束时可能会发生什么
研究人员为几十亿年后我们的太阳系可能会发生什么建立了一个模型。虽然一个行星系统及其主宰恒星的寿命结束时会发生什么，现在还不确定，但是Boris Gansicke和同事的研究对此提供了一些线索。这些天文学家研究了相当于我们的太阳质量的75%的热白矮星，该白矮星有一些扁平和盘状的碎片环绕着它，而且有一个不同寻常的离子化钙双峰辐射线。研究人员在辐射中观察到一个频移，证明环绕这个白矮星的物质中有富含金属的盘。所以在很远的未来，我们的行星可能也会以同样的方式崩溃。这个发现也显示行星系统能环绕大质量的恒星形成，因为这个白矮星最初比我们的太阳要大，可能是太阳的8倍。
报告：A Gaseous Metal Disk Around a White Dwarf, B. T. Gansicke, T. R. Marsh, J. Southworth, and A. Rebassa-Mansergas
一个蛋白、两种功能
新研究展示了一个蛋白如何响应不同的环境来完成两种完全不同的功能，铁调节蛋白IRP1在富铁细胞中的作用是催化，而在贫铁细胞中，它帮助调节涉及铁输运、存贮、或利用的基因的表达。William Walden和同事确定了IRP1蛋白与信使RNA中一个响应铁的元素结合的晶体结构，为该蛋白的部分如何为完成这两种不同的任务重新排列提供了线索。一篇相关的研究评述讨论了这些发现。
研究文章：Structure of Dual Function Iron Regulatory Protein 1 Complexed with Ferritin IRE-RNA, William E. Walden, et al.
研究评述：If the RNA Fits, Use It, Tracey A. Rouault
Contents
Special Issue
Breakthrough of the Year
News
BREAKTHROUGH OF THE YEAR: The Poincaré Conjecture--Proved
Dana Mackenzie
Science 22 December 2006: 1848-1849.
Summary »| Full Text »| PDF »|
BREAKTHROUGH OF THE YEAR: The Runners-Up
Science 22 December 2006: 1850-1855.
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BREAKTHROUGH OF THE YEAR: Scorecard 2006
Science 22 December 2006: 1850-1851.
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BREAKTHROUGH OF THE YEAR: BREAKDOWN OF THE YEAR: Scientific Fraud
Jennifer Couzin
Science 22 December 2006: 1853.
Summary »| Full Text »| PDF »|
BREAKTHROUGH OF THE YEAR: Areas to Watch in 2007
Science 22 December 2006: 1854-1855.
Summary »| Full Text »| PDF »|
This Week in Science
Editor summaries of this week's papers.
Science 22 December 2006: 1837.
|Full Text »
Editorial:
Breakthrough of the Year
Donald Kennedy
Science 22 December 2006: 1841.
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Editors' Choice
Highlights of the recent literature.
Science 22 December 2006: 1842.
|Full Text »
Science Podcast
Science 22 December 2006: 1945.
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NEW PRODUCTS
Science 22 December 2006: 1945.
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News of the Week
SCIENTIFIC PUBLISHING: A Scientist's Nightmare: Software Problem Leads to Five Retractions
Greg Miller
Science 22 December 2006: 1856-1857.
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U.S. OCEAN POLICY: Fisheries Bill Gives Bigger Role to Science--But No Money
Erik Stokstad
Science 22 December 2006: 1857.
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IMMUNOLOGY: Mouse Studies Question Importance of Toll-Like Receptors to Vaccines
Ingrid Wickelgren
Science 22 December 2006: 1859-1860.
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WILDLIFE CONSERVATION: River Dolphins Down for the Count, and Perhaps Out
Jerry Guo
Science 22 December 2006: 1860.
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ENVIRONMENT: Spain's Prestige Oil Spill Resurfaces
Xavier Bosch
Science 22 December 2006: 1861.
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ARCHAEOLOGY: Researchers Helpless as Bosnian Pyramid Bandwagon Gathers Pace
John Bohannon
Science 22 December 2006: 1862.
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2007 U.S. BUDGET: NIH Trims Award Size as Spending Crunch Looms
Jeffrey Mervis
Science 22 December 2006: 1862.
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NONPROLIFERATION: Indo-U.S. Nuclear Pact in Jeopardy
Pallava Bagla
Science 22 December 2006: 1863.
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AMERICAN SOCIETY FOR CELL BIOLOGY MEETING: A Gut Germ Goes AWOL
Mitch Leslie
Science 22 December 2006: 1865.
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AMERICAN SOCIETY FOR CELL BIOLOGY: Sprayed-on Growth Factors Guide Stem Cells
Mitch Leslie
Science 22 December 2006: 1865.
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ScienceScope
Science 22 December 2006: 1859.
|Full Text »
Random Samples
Science 22 December 2006: 1845.
|Full Text »
Newsmakers
Science 22 December 2006: 1847.
|Full Text »
News Focus
SCIENTIFIC PUBLISHING: Don't Pretty Up That Picture Just Yet
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