其树

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。

The flower is cardinal, when blooming, man Shuzhi does compose to admire completely and huge flower, like a raging fire, dazzling and marked, very gallant, element has " the hero is cultivated " good name.

如棉花的细毛。其树高，可达25m。花-红色，盛开时，满树枝干缀满艳而硕大-花朵，如火如荼，刺眼醒目，极为壮丽，素-有"英雄树"之美称。

On this page, administrators can review their books for orphans and reattach those pages as desired.

管理者可以在这个管理介面里，重新检视这些孤立的页面，并重建其树状架构。

The traditional query tree optimization methods,parallel database optimization methods based on left linear trees and right linear trees,bushy trees,and operation of the forest,have their own pros and cons,they have been more in-depth and maturity of the study.The query optimization method based on multiple weighted tree has studied its model of parallel query plan,its complexity model of parallel query plan and query optimization algorithms.The semantic query method transforms an inquiry into one or several semantic equivalence inquiries then has to find and implement a strategy to achieve a better query.Agent-based parallel database query optimization using Multi-Agent technology to automatically search the integrity constraint conditions which are related to the determined query,there for,the efficiency between several relations' joins has been greatly improved.The parallel optimization algorithm,based on genetic algorithm which is suitable for multi-joins of cluster environment,has deeply studied the relations storage options,multi-joins query optimization and query processing and other key technologies based on cluster parallel database.

传统的查询树优化方法，即基于左线性树、右线性树、浓密树、操作森林的并行数据库查询优化方法，各有优劣，对其的研究比较深入、成熟；基于多重加权树的查询优化方法，研究了其并行查询计划模型、并行查询计划的复杂性模型和查询优化算法；语义查询优化方法将一个查询变换成一个或数个语义等价的查询，进而寻找并执行这些等价查询中具有较好实现策略的一个；基于Agent的并行数据库查询优化采用Multi-Agent技术自动查找与给定查询有关的完整性约束条件，使得多个关系间连接操作的效率得到很大的提高；基于遗传算法的并行优化算法，深入研究了基于机群并行数据库中关系存储的选择、多连接查询优化和查询处理等关键技术。

The posture, foliage, flower and fruit of Cydonia oblonga Mill have highly ornamental value, so it is a good stirp of decorative trees.

其树姿、叶片、花和果实均具有较高的观赏价值，是较好的观赏树种

The research calculates the tree-level and full one-loop electroweak corrections to the third generation scalar-quark pair production in polarized γγ collisions in the minimal supersymmetric standard model, and compares the numerical results with the unpolarized.

研究了γγ→qiqi过程中光子极化对其树图阶和完整一圈电弱修正截面的效应，给出了具体的计算结果，并与非极化光子对撞机上结果进行了比较。

First described the current production flow about company A briefly; Secondly, analyses its manufacture scene strictly according to theory of constraint thinking process,through structured Current Reality Tree finding out its bottleneck;By structured conflict picture, seek the inflex

首先对A公司生产现场管理现状进行了简要描述；其次结合约束理论，严格按照其思维流程对该公司的生产现场进行了分析，构建了该企业的当前现实树，并找出其瓶颈所在；通过构建冲突图，寻找解决冲突的注入，建立了公司改善的未来现实树；以未来现实树为引导，结合丰田生产方式的一系列现场改善工具，从改善员工工作环境，提高员工满意度，增加员工技能培训，建立一系列制度措施保证现场的秩序化等方面入手，构建了公司的转变树，并得到了良好的执行；最后根据案例的实际运行情况，结合笔者的自身体会，对企业应用约束理论和丰田生产方式改善生产现场的操作流程提出了自己的设想。

In mixed or uneven-aged stands, due to the lack of a height/age relationship, the site index is not a reasonably reliable site productivity measurement.

在混淆或异龄林之林分，由於其树高和年龄间之关系并非如单纯林那样明确，使得以树高-年龄为基础所导出的地位指数无法理想地适用於混淆人工林内。

There was a giant tree beside the temple of Earth God. Its shade was large enough to be as a resting place for thousands of cattle; its trunk was hundreds feet in its waist circle; its top was eight feet higher than the nearby mounds.

就在当地土地公庙旁，有一棵巨大无比的树，其树荫所到之处足可供千头牛在它树下休息，其树干的腰围有百来尺粗，其树巅比起附近的山丘还要高上八十余尺。

Ericerus pela Chavannes main parasitic in Ligustrum lucidum Ait and Ligustrum guiboni Carr drawn on the sap of its shushi frail and into a film impact of its ornamental value.

中文摘要：摘要：白蜡虫主要寄生在小叶女贞、女贞上吸取树体的汁液造成其树势衰弱，枝条成片枯死，影响其观赏价值。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失