Volume 434 Number 7032 pp421-544封面故事：能隔代遗传的植物
由孟德尔首次观察到的遗传原理是足够清楚的。遗传信息在生物体的每个细胞中都有的染色体所携带的DNA中从父辈传给子辈，在如线粒体和叶绿体等细胞器中的辅助基因组中也进行着这样的遗传信息传递，只是程度小一些。但对拟南芥（Arabidopsis thaliana）中发生回复突变的hothead基因突变体所做的分析表明，这些植物能遗传在父辈染色体中没有、但与祖父或更远祖先的染色体中相同的信息。这可能涉及从一个RNA存放处传递来的祖先DNA在模板引导下的恢复，这种RNA存放处就像一个存放旧网页的浏览器存放处一样。研究这种形式的遗传是否普遍存在将会很有趣。本期封面所示为一株有hothead突变体的花（扫描电子显微图片由M. A. Webb提供）。
“弗洛勒斯人”发掘工作还在继续
Nature杂志上宣布在印尼弗洛勒斯岛上发现“弗洛勒斯人”（Homo floresiensis）的论文（发表在去年10月28日一期Nature上）引起了轰动。生活在距今仅18000年前的一种微型人类的存在是人们未曾料到的，导致一些持怀疑态度者对该发现提出不同解释。在印尼这一岛屿上更多人类遗骨的发现可能会揭开这个人种是怎样演化及什么时候演化的谜团，所以研究人员还在寻找。Nature杂志记者Rex Dalton放下他在圣迭哥的事情对挖掘工作进行了采访，他发现了为什么在这一地区工作是如此大的一个挑战。
大象会学卡车叫声
人类、鸟类、蝙蝠和海豚模仿同类中其他成员叫声的能力可能已经演化到了当动物分开后再团聚时用来恢复彼此之间联系的程度。如果是这样的话，声音的学习也许能在其他社会性物种中见到。巴塞尔动物园中一头雄性非洲象的行为表明，非灵长类动物也能利用模仿。在与两头雌性亚洲象呆了18年之后，这头名叫Calimero的雄性非洲象也能发出被认为是亚洲象专利的叽叽叫声。另一头非洲象，一头名叫Mlaika的母象，能模仿一种更不太可能的声音：附近内罗毕-蒙巴萨高速公路上卡车的隆隆声。Mlaika卡车一样的叫声作为“补充信息”可在上听到。
线虫的基因筛选研究
要将由基因组测序工作所产生的大量信息变成关于基因的生物功能的知识，需要进行本期Nature上所报道的对线虫（Caenorhabditis elegans）所做的那种规模的筛选研究。该项目识别细胞分裂所需的基因，采用基因组范围内的RNA干涉来阻断基因组中98%的基因的表达，然后通过“差异干涉对比显微方法”拍摄4000幅以上影像，并对其进行观察，搞清哪些基因图像影响了受精后前两轮的细胞“有丝分裂”。这些早期阶段的胚胎生成需要650个以上基因。
大脑中对尿有反应的细胞区域
多数哺乳动物能根据身体分泌物如汗液中的气味来相互识别。对很多动物来说，尿是关于另一个体身份和性别的一个丰富的信息来源。然而，对这些信号的化学性质和它们在大脑中是如何表示的我们知之甚少。现在，通过记录小鼠大脑的嗅球中各个神经细胞的活动，研究人员发现了一个被尿激发的细胞区域。这些细胞中有些只对雄性尿液中一个以前不知道的成分有反应，即巯基甲烷（methanethiol）。该化学物质对人来说有强烈大蒜味，比其他信息素挥发性强，也许能指示尿是否新鲜。
太阳表面的暗丝结构
在太阳表面上所观测到的诸多结构中有将极性相反的太阳黑子连接起来的暗丝，它们与来自太阳内部的磁通量的出现有关，其喷射活动和X-射线发射活动表明，它们在日冕加热中发挥一定作用。在“地球模拟器”（一台超级计算机，很可能具有世界上最高的模拟性能）进行的第一批天体物理计算中，研究人员发现暗丝结构是自然地来自“瑞利-泰勒”不稳定性，这是当一种致密的重流体被一种轻流体加速时所出现的一种不稳定性。这可以解释日冕加热中所出现的间断和太阳耀斑中的亮斑等现象。
纪念“玻色-爱因斯坦凝聚态”发现10周年
自被称为“玻色-爱因斯坦凝聚态”的奇异的物质形式首次生成以来已有10年了。该成果是超低温物理学的诞生，该领域的科学家上月聚集加拿大Banff举行庆祝活动，同时讨论最新动态。Karen Fox对他们的研讨活动进行了报道。（News Feature, p. 430）本期Nature宣布了一项有可能在该领域产生重大影响的新进展。上个世纪50年代，Hanbury Brown和Twiss发现，有可能通过独立探测器中信号强度的关联性来测量天文射电源的角度大小。这种被称为“HBT干涉测量法”的方法后来成为量子光学中的一个关键技术，现在它已被用来识别“超冷玻色原子”的一个量子相。
微型气相激光器
小到足以放进一张信用卡中或一个手持激光指示器中的气相激光器很快将变成现实。研究人员开发出一种基于中空光子晶体纤维的气体腔，它在一个5米长的空腔中含有十分之一微升的氢。激光可很容易发射进这一空腔中，其实用性已被在一种紧凑型“拉曼”激光器中的应用所证明。填充有乙炔的空腔在一种紧凑型全光纤系统中已经证明了它们的价值，它们在这种全光纤系统中的作用是稳定激光频率。
二叠纪/三叠纪边界灭绝事件的分子标记
二叠纪/三叠纪边界（距今约2.40亿年前）发生了已知最严重的灭绝事件之一。新的证据表明，二叠纪末期的这次生态危机是以至少两次有明显分别的事件的形式出现的。能够进行光合作用的“藻青菌”（“绿色粘菌”）过去的种群以Methylhopanes的形式留下了一个分子化石。在中国二叠纪/三叠纪边界沉积层中留下的这些标记，记录了两次生态危机中每次之后“藻青菌”数量的迅速增加。
Afrotheria存在与否及其起源
1998年，分子演化学家提出一个令人震惊的观点：若干组表面有差异的哺乳动物实际上是密切相关的。像大象、蹄兔、象鼠和土豚这些差异很大的动物被称为“Afrotheres”，据说是为了表示很久之前当非洲还是一个岛屿、很像今天的澳大利亚时哺乳动物的大规模繁殖（这些动物相当于澳大利亚的本地动物袋鼠）。Afrotheria的存在很少或几乎没有得到古生物学家的支持，而在本期Nature上又遭到了冷落。 Zack等人对迄今为止仍像谜一样的、来自北美的化石动物Hyopsodontids进行了研究，将其与象鼠列为一类。这表明，如果Afrotheria过去真的存在，那么其起源也未必是非洲。
雄性性装饰演化之谜
雄性性装饰的演化是一个谜，因为它们似乎忽略了自然选择，后者倾向于装饰越少越好。它们通常被解释为遗传素质的标志，或被人为地与更具有功能性的雌性偏好联系起来。用Goodeinae（一种来自墨西哥中部的小鱼）所做的实验表明，装饰演化的最初阶段由性冲突来引导，表现为一种“传感陷阱”，即利用原本存在的一种雌性偏见。雌性后来学会如何来区分模特与装饰，然后使装饰演化贯穿于经典的性别选择过程。在Goodeinae鱼的雄性装饰中，尾鳍上蠕虫一样的图案首先形成，因为雌性会以进食行为（传感陷阱）对此做出反应，但随着尾鳍长得越来越明显（而且成本高昂），雌性开始以性行为对其做出反应。
Leptin在骨发育中的作用
骨结构和功能是由骨重塑来维持的，后者是“破骨细胞”的骨再吸收作用与“造骨细胞”的骨形成作用之间的一种平衡。用小鼠进行的新的研究工作显示，Leptin（一种调节体重和性腺功能的激素，对其这种作用人们最为了解）在维持这种平衡中可能扮演一个重要角色。在一个通道中，Leptin对交感神经元的刺激会促进“破骨细胞”的分异（促进骨再吸收），而在另一通道中，一个被称为CART的神经肽抑制“破骨细胞”的分异。阻断这一由Leptin调节的神经通道，也许能防止骨质疏松病患中的骨质损失。
本期目录：
Editorial
Joys of (top-notch) supervision p421
The roles of mentors in research are seldom appreciated, let alone rewarded. All the more reason to celebrate the winners of the Nature/NESTA awards for creative mentoring in science.
doi: 10.1038/434421a
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Top of pageNews
US launches probe into sales of unapproved transgenic corn p423
Syngenta admits 150 square kilometres accidentally sown with wrong seeds.
Colin Macilwain
doi: 10.1038/nature03570
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Obesity expert owns up to million-dollar crime p424
Physiologist pleads guilty to one of the largest misconduct cases on record.
Rex Dalton
doi: 10.1038/434424a
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No-confidence vote fails to shift Harvard president p424
University faculty members may call for Larry Summers to step down.
Emily Singer
doi: 10.1038/434424b
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France takes on Google in scanning race p425
Jacques Chirac calls for proposals to digitize Europe's libraries.
Declan Butler
doi: 10.1038/434425a
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Surfeit of boys could spread AIDS in China's cities p425
Gender bias could spell bad news for health in Shanghai.
David Cyranoski
doi: 10.1038/434425b
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Academies seek better prospects for postdocs p426
US report advises reforms to improve the lot of young scientists.
Jessica Ebert
doi: 10.1038/434426a
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US undervalues foreign researchers, survey reveals p426
Foreign postdocs work longer hours and are paid less than American counterparts.
Rex Dalton
doi: 10.1038/434426b
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Lawsuits and logistics tie up California's stem-cell funds p427
State funding for stem-cell research delayed by red tape.
Peter Aldhous
doi: 10.1038/434427a
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Fake papers hamper plans for nuclear store at Yucca Mountain p427
Documents relating to safety may have been falsified.
Geoff Brumfiel
doi: 10.1038/434427b
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news in brief p428
doi: 10.1038/434428a
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Top of pageNews Features
Condensed matter physics: Some like it cold p430
In 1995, scientists created the first ultracold quantum gas and to their surprise launched a new scientific field. Ten years on and its chilly revelations are attracting a growing number of physicists. Karen Fox joins the party.
doi: 10.1038/434430a
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Palaeoanthropology: Looking for the ancestors p432
The scientists who discovered a new species of human in Indonesia last year are now back, looking for the bones that will flesh out their theories. Rex Dalton joins them.
doi: 10.1038/434432a
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Top of pageCorrespondence
Immigration could ease climate-change impact p435
A modest proposal to allow the big gas-emitters to take their share of responsibility.
Sujatha Byravan and Sudhir Chella Rajan
doi: 10.1038/434435a
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Consumer law is used to attack climate findings p435
Michael C. MacCracken
doi: 10.1038/434435b
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That chemist pose is a classic because we do it p435
Piers R. J. Gaffney
doi: 10.1038/434435c
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Erratum p435
doi: 10.1038/434435d
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Top of pageBooks and Arts
The never-ending story p437
A guide to the biggest idea in the Universe: infinity.
Simon Singh reviews The Infinite Book: A Short Guide to the Boundless, Timeless and Endless by John D. Barrow
doi: 10.1038/434437a
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Wine with a deep flavour p438
George W. Moore reviews The Winemaker's Dance: Exploring Terroir in the Napa Valley by Jonathan Swinchatt and David G. Howell
doi: 10.1038/434438a
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The quantum Universe p438
Frank Close reviews Science and Ultimate Reality: Quantum Theory, Cosmology and Complexity edited by John D. Barrow, Paul C. W. Davies and Charles L. Harper, , Jr
doi: 10.1038/434438b
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Museum: Waxing and waning p439
Achim Schneider
doi: 10.1038/434439a
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Top of pagePhysics Detective
Schr?dinger's mousetrap p440
Part 10: The trap is sprung.
Henry Gee
doi: 10.1038/434440a
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Top of pageNews and Views
Genetics: Hotheaded healer p443
A previously unknown way of reversing genome-wide sequence changes in DNA has been revealed by an analysis of plants carrying mutations in a gene called HOTHEAD. The mechanism remains a mystery.
Detlef Weigel and Gerd Jürgens
doi: 10.1038/434443a
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Genomics: Frontiers of gene function p444
The technique of RNA interference continues to pay dividends. The latest application of the method to the nematode worm adds detail to the list of genes known to function in the early stages of development.
Sean M. O'Rourke and Bruce Bowerman
doi: 10.1038/434444a
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Earth science: A different kind of foreshock p445
Underwater sound recordings have been used to monitor transform faults in the equatorial Pacific, implicating a mechanism of foreshock generation distinct from that on most continental fault systems.
DelWayne R. Bohnenstiehl
doi: 10.1038/434445a
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Physiology: Do neural signals remodel bone? p447
The hormone leptin is best known for its influence on body weight. But it also controls bone mass, and recent work in mice is beginning to uncover the neuroendocrine systems involved.
Joel K. Elmquist and Gordon J. Strewler
doi: 10.1038/434447a
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Condensed-matter physics: Lab in a trap p448
May Chiao
doi: 10.1038/434448a
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Biodiversity: Gut feeling for yeasts p449
The startling news that has emerged from studies of the intestines of beetles is a reminder of how little is known about the diversity of even such comparatively well-characterized groups as the yeasts.
Teun Boekhout
doi: 10.1038/434449a
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Nanotechnology: New spin on correlated electrons p451
In the Kondo effect, the flow of electrons in a solid is modulated by magnetic impurities. Nanostructures such as carbon nanotubes can be designed to obtain even more complex versions of this intriguing effect.
Ronald M. Potok and David Goldhaber-Gordon
doi: 10.1038/434451a
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100 and 50 years ago p451
doi: 10.1038/434451b
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Obituary: Hubert Curien (1924?2005) p453
Declan Butler
doi: 10.1038/434453a
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research highlights p454
doi: 10.1038/434454a
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Top of pageBrief Communications
Animal behaviour: Elephants are capable of vocal learning p455
Two animals coin unexpected sounds as a surprising form of social communication.
Joyce H. Poole, Peter L. Tyack, Angela S. Stoeger-Horwath and Stephanie Watwood
doi: 10.1038/434455a
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Meteorology: Dusty ice clouds over Alaska p456
Kenneth Sassen
doi: 10.1038/434456a
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Top of pageArticles
Foreshock sequences and short-term earthquake predictability on East Pacific Rise transform faults p457
Jeffrey J. McGuire, Margaret S. Boettcher and Thomas H. Jordan
doi: 10.1038/nature03377
Abstract | Full Text | PDF (499K) | Supplementary information
See also: News and Views by Bohnenstiehl
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Full-genome RNAi profiling of early embryogenesis in Caenorhabditis elegans p462
B. S?nnichsen, L. B. Koski, A. Walsh, P. Marschall, B. Neumann, M. Brehm, A.-M. Alleaume, J. Artelt, P. Bettencourt, E. Cassin, M. Hewitson, C. Holz, M. Khan, S. Lazik, C. Martin, B. Nitzsche, M. Ruer, J. Stamford, M. Winzi, R. Heinkel, M. R?der, J. Finell, H. H?ntsch, S. J. M. Jones, M. Jones, F. Piano, K. C. Gunsalus, K. Oegema, P. G?nczy, A. Coulson, A. A. Hyman and C. J. Echeverri
doi: 10.1038/nature03353
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Encoding social signals in the mouse main olfactory bulb p470
Da Yu Lin, Shao-Zhong Zhang, Eric Block and Lawrence C. Katz
doi: 10.1038/nature03414
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Top of pageLetters to Nature
Filamentary structure on the Sun from the magnetic Rayleigh?Taylor instability p478
Hiroaki Isobe, Takehiro Miyagoshi, Kazunari Shibata and Takaaki Yokoyama
doi: 10.1038/nature03399
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Spatial quantum noise interferometry in expanding ultracold atom clouds p481
Simon F?lling, Fabrice Gerbier, Artur Widera, Olaf Mandel, Tatjana Gericke and Immanuel Bloch
doi: 10.1038/nature03500
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Orbital Kondo effect in carbon nanotubes p484
Pablo Jarillo-Herrero, Jing Kong, Herre S.J. van der Zant, Cees Dekker, Leo P. Kouwenhoven and Silvano De Franceschi
doi: 10.1038/nature03422
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See also: News and Views by Potok & Goldhaber-Gordon
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Compact, stable and efficient all-fibre gas cells using hollow-core photonic crystal fibres p488
F. Benabid, F. Couny, J. C. Knight, T. A. Birks and P. St J. Russell
doi: 10.1038/nature03349
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Obliquity pacing of the late Pleistocene glacial terminations p491
Peter Huybers and Carl Wunsch
doi: 10.1038/nature03401
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Two episodes of microbial change coupled with Permo/Triassic faunal mass extinction p494
Shucheng Xie, Richard D. Pancost, Hongfu Yin, Hongmei Wang and Richard P. Evershed
doi: 10.1038/nature03396
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Affinities of 'hyopsodontids' to elephant shrews and a Holarctic origin of Afrotheria p497
Shawn P. Zack, Tonya A. Penkrot, Jonathan I. Bloch and Kenneth D. Rose
doi: 10.1038/nature03351
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Evidence that sensory traps can evolve into honest signals p501
Constantino Macías Garcia and Elvia Ramirez
doi: 10.1038/nature03363
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Genome-wide non-mendelian inheritance of extra-genomic information in Arabidopsis p505
Susan J. Lolle, Jennifer L. Victor, Jessica M. Young and Robert E. Pruitt
doi: 10.1038/nature03380
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Independent recruitment of a conserved developmental mechanism during leaf evolution p509
C. Jill Harrison, Susie B. Corley, Elizabeth C. Moylan, Debbie L. Alexander, Robert W. Scotland and Jane A. Langdale
doi: 10.1038/nature03410
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Leptin regulation of bone resorption by the sympathetic nervous system and CART p514
Florent Elefteriou, Jong Deok Ahn, Shu Takeda, Michael Starbuck, Xiangli Yang, Xiuyun Liu, Hisataka Kondo, William G. Richards, Tony W. Bannon, Masaki Noda, Karine Clement, Christian Vaisse and Gerard Karsenty
doi: 10.1038/nature03398
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Recognition of bacterial glycosphingolipids by natural killer T cells p520
Yuki Kinjo, Douglass Wu, Gisen Kim, Guo-Wen Xing, Michael A. Poles, David D. Ho, Moriya Tsuji, Kazuyoshi Kawahara, Chi-Huey Wong and Mitchell Kronenberg
doi: 10.1038/nature03407
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Exogenous and endogenous glycolipid antigens activate NKT cells during microbial infections p525
Jochen Mattner, Kristin L. DeBord, Nahed Ismail, Randal D. Goff, Carlos Cantu, III, Dapeng Zhou, Pierre Saint-Mezard, Vivien Wang, Ying Gao, Ning Yin, Kasper Hoebe, Olaf Schneewind, David Walker, Bruce Beutler, Luc Teyton, Paul B. Savage and Albert Bendelac
doi: 10.1038/nature03408
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Fission yeast Mes1p ensures the onset of meiosis II by blocking degradation of cyclin Cdc13p p529
Daisuke Izawa, Masuo Goto, Akira Yamashita, Hiroyuki Yamano and Masayuki Yamamoto
doi: 10.1038/nature03406
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Recruitment of Drosophila Polycomb group proteins to chromatin by DSP1 p533
Jér?me Déjardin, Aurélien Rappailles, Olivier Cuvier, Charlotte Grimaud, Martine Decoville, Daniel Locker and Giacomo Cavalli
doi: 10.1038/nature03386
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Top of pageNaturejobs
Prospects
Tale of two surveys p539
Paul Smaglik
doi: 10.1038/nj7032-539a
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Special Report
Pity poor postdocs p540
Many European PhD students and junior researchers are getting a bad deal, with few rights and little or no supervision. But things are about to change, reports Quirin Schiermeier.
Quirin Schiermeier
doi: 10.1038/nj7032-540a
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Career View
Graduate Journal: Facing the reviewers p542
Jason Underwood
doi: 10.1038/nj7032-542a
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Recruiters & Academia p542
Jonas F. Ludvigsson
doi: 10.1038/nj7032-542b
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Movers p542
doi: 10.1038/nj7032-542c
Full Text | PDF (90K)
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Heartwired p544
Love is the drug.
Joe Haldeman
doi: 10.1038/434544a
Full Text | PDF (237K)
