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During the postgenomics era the information about genomic sequence and gene functions provides a new foundation for evolutionary biology and ecology As the first whole-genome sequenced plant Arabidopsis thaliana and its wild relatives have played a critical role in understanding the evolution of genomics and speciation Both A halleri and A lyrata are closely related to the model species A thaliana A halleri ssp gemmifera occurs in northeastern China Japan and Taiwan; while its sister A halleri ssp halleri is mainly distributed in Europe Geographical barriers such as Tienshan Mountain Range isolate these intraspecific sisters Likewise A lyrata ssp kamchatica and ssp lyrata occur in East Asia and North America respectively Such distribution patterns seem to be consistent with allopartic speciation The comparison between ancestral and extant polymorphism by multilocus can be informative about the population genetics of speciation In this study we collected and analyzed DNA sequences of 98 genes from four wild relatives of A thaliana A halleri ssp gemmifera A halleri ssp halleri A lyrata ssp kamchatica and A lyrata ssp lyrata The ancestral states of these four species were compared to each other in terms of level of genetic variation However the ancestral species at the time of speciation were substantially more polymorphic than the extant geographical populations The observations are not fully compatible with speciation by strict allopatry At some species pairs parapatric speciation seems more reasonable in speciation of Arabidopsis The 98 gene sequences are also used for the congruence test between gene genealogy and species phylogeny Only 28 genes support the species phylogeny but there are 23 genes supports another major genealogy { lyrata} thaliana Based on the phylogenetic position change of A lyrata ssp kamchatica and Ks value for each species pair suggested the recent directional gene flow between A halleri ssp gemmifera and A lyrata ssp kamchatica

阿拉伯芥是第一个完成基因体定序的开花植物,其基因体资讯提供植物学研究的重要依据;在解析阿拉伯芥属物种的亲缘关系以及种化机制等重要的演化议题时,阿拉伯芥近缘的野生物种自然成了不可或缺的关键;跟阿拉伯芥近缘的物种包括A halleri及A lyrata,其中A halleri ssp gemmifera主要分布於中国东北、日本以及台湾,与近缘的A halleri ssp halleri其分布於欧洲隔著天山及大陆的障蔽,而A lyrata ssp kamchatica主要分布於东北亚及台湾,与分布於北美五大湖的A lyrata ssp lyrata被北极圈所分隔,这样的分布模式暗示异域种化的可能。藉由多基因分析比较祖先物种与现生物种遗传歧异度的相关可提供讯息探讨种化时期的族群遗传结构,本研究针对A halleri ssp gemmifera、A halleri ssp halleri及A lyrata ssp kamchatica、A lyrata ssp lyrata四个物种,两对互为亚种的姊妹群,以阿拉伯芥为外群进行研究,在四个物种完成98个同源基因的分子序列,利用套装软体MCMCcoal来估算祖先物种的遗传变异,亦估算现生物种的核苷酸歧异度,观察到?多物种配对中祖先物种遗传多型性大於现生物种DNA歧异度,显示异域种化模型并无法完全解释阿拉伯芥属物种的种化模式,在某些物种配对间邻域种化模式应比异域种化更为可能;在基因树与物种树的比较,98个基因片段的亲缘模式只有28个是与已知物种树一致的,有23个基因其树状图支持{ lyrata} thaliana的型式,藉由kamchatica位置的变化以及估算各物种配对间的平均同义置换率,推测在A halleri ssp gemmifera与A lyrata ssp kamchatica间具有近代的单方向基因交流。

His village home lay there at the end of the waste land, beyond thesugar-cane field, hidden among the shadows of the banana and theslender areca palm, the coconut and the dark green jack-fruittrees.

他的家就在荒地边缘的村庄里,在甘蔗园之后,隐藏在香蕉树、细长槟榔树、椰子树以及深绿榴莲树的浓荫里。

So, I could spend 2 points in Heightened Senses which is a berserker skill, and 3 points in Bash which is a Juggernaut skill, thus adding up to 5 points and granting me access to the second tier of skills for all of the trees.

所以,我可以在狂战士技能树的高度警觉上加2点,在毁灭技能树的重击上加3点,这样就有5点了,然后就可以允许我在所有这些树的第二层加点。

However, careful you can easily find in this tree there is no other trees around the figure, it is difficult grass under a tree to survive, this is a natural phenomenon.

然而,细心的你不难发现,在这棵树的周边没有了别的树的身影,树下小草也难以生存,这是一个自然现象。

In the ER-Tree, the efficiency of retrieval could be improved by the ways of partition of the vector space with hyper-sphere and R*-Tree s re-insert technology introduced to enhance ER-Tree s capability to represent the data-sets'features.

该索引树用超球体划分多维向量空间,以有利于计算最近邻;吸取R*-Tree树的重插技术,以增强索引树对数据集整体特征的表达能力,从而提高检索效率;通过引入插入安全点和删除安全点概念,有效地提高建树的效率。

The maximum parsimony trees of matK indicated that Myricaceae are sister to (Betulaceae-Ticodendraceae)-Casuarinaceae clade; however, trnL-F trees showed that Myricaceae are sister to Juglandaceae-Rhoiptelea clade.

最简约树的严格一致树显示杨梅科和木麻黄科聚在一起得到的BS支持不强,另外桦木科和核果桦科,壳斗科和马尾树科分别聚在一起,但得到的支持都未超过50%。

Http://photos.gznet.com/photos/1077167/1077167-tAo5MLwz4G$PERvFtBjZSjnL7ejp4g .gif 幽影六腿马没有图图……幽影树怪图图: http://photos.gznet.com/photos/1077167/1077167-NP9r$hEBONk5R7szA8z$4plQkqeLkz .gif 新出现的译名 Ephemera 幽影生物 Dusk Beast 双头幽影兽 Ecalypse 幽影六腿马 Discorporate 不稳构造 Umbral Banyan 幽影树怪 Yank upward 猛扯上拉没想到幽影生物一个比一个弱智……——||)-- Griffons make their homes in high places,swooping down with a shrill,eaglelike cry to attack their prey.

伪装:因为当幽影树怪休息时和一般的树木无异,故必须要在它攻击之前通过一次成功的侦察技能检定(DC 25)来发现它的存在。

Knema globularia belongs to the family Myristicaceae. The CHCl〓 extract of Knema globularia showed strong anti-PAF activity. It can also inhibit platelet aggregation induced by AA and ADP.

小叶红光树为肉豆蔻科红光树属植物,对其粗提物进行药理筛选的结果表明,小叶红光树的CHCl〓部分具有较好的抗PAF活性,另外还具有对抗花生四烯酸和ADP诱导能力。

And that they should proclaim this word and spread it throughout their towns and in Jerusalem:"Go out into the hill country and bring back branches from olive and wild olive trees, and from myrtles, palms and shade trees, to make booths"--as it is written.

并要在各城和耶路撒冷宣传报告说,你们当上山,将橄榄树,野橄榄树,番石榴树,棕树,和各样茂密树的枝子取来,照着所写的搭棚。

The wood of a gum tree .

胶树材产树胶的树的木材;胶树材

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Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来,英国,在此地早期居住的是凯尔特人,已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。

The almost sure central limit theorem is a pop topic of the probability research in recent years,because it has many actual applications in the random analogue.

中文摘要:几乎处处中心极限定理是近几十年概率论研究的一个热门话题。它之所以引起人们的注意是由于它在随机模拟方面的实际应用参见Fisher