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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。
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Its characteristic is: Have good bibulous performance and ventilated property, actual hea
其特征是:有良好滴吸水质量和透风质量,事实换热辐面靠近表辐面的100倍;材质壮实、耐水浸泡而非改变现状;耐侵蚀,正常应用寿运可达到五年,能够达到和实现低于外面4℃-10℃的降冷作用,同时对空气air中的微尘具备良好滴筛选质量,可自行诘淨,因此完成诘白与降冷的作用。
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The result can be widely applied to many aspects of product design systems,such as parametric design by geometric reason-ing,decomposition of complex design tasks and dependency analysis of design parameters.
该方法在产品设计中有广泛的应用,利用这个模型和算法可较好地解决参数化设计中的几何推理问题,还可用作概念设计的工具,用于完成复杂系统设计任务的划分及定序、设计变量之间相互依赖关系分析等工作。
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Surcharging is one of the exsiting ground improvement techniques. It could be used to reduce long term settlement and also used to increase soil strength. But the rebound and recompression properties after surcharge removal are not well established.
超载工法为众多地盘改良工法之一,常被用来改良软弱土壤,不仅可增加土壤的强度,并可避免建物完成后因不均匀的沉陷而衍生问题,但是对於地盘受超载改良后的回胀与再压缩性质一直无法确实的了解。
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It is typically performed during the deserialization of a relocatable object from disk, such as an executable file or pointer-based data structure.
典型的就是它在一个可重新定位的磁盘中对象的反序列化被完成,像一个可执行文件或基本指针的数据结构。
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2 The execution, delivery, performance and completion of this agreement and the Investor Rights Agreement by each of the Warrantors do not and will not violate in any respect any provision of any law or regulation or any order or decree of any governmental authority, agency or court of any jurisdiction which is applicable to the Warrantor, any Group Company or any Associated Company; the laws and documents incorporating and constituting the Warrantor, any Group Company or any Associated Company prevailing as at the date of this agreement and as at Completion; or any mortgage, contract or other undertaking or instrument to which the Warrantor, any Group Company or any Associated Company is a party or which is binding upon it or any of its assets, and does not and will not result in the creation or imposition of any encumbrance on any of its assets pursuant to the provisions of any such mortgage, contract or other undertaking or instrument.
5.2 由每位担保人实施的本协议和投资者权利协议的执行、送达、履行和完成在任何方面都不会并将不会违反:1)可适用于担保人、任何集团公司或任何联营公司的任何有管辖权的任何政府部门、机构或法院的任何法律、任何规章或任何命令或法令的任何规定-(2)在本协议签订之日和完成之日实行的合并和组成担保人、任何集团公司或任何联营公司的法律和文件的任何规定或(3)担保人、任何集团公司或任何联营公司作为一方或者对其或对其任何资产有约束力的任何抵押,合同或者其他担保或契约的任何规定,而且依照任何这种抵押,合同或者其他担保或契约的任何规定不会并将不会对其任何资产造成任何负担的设立和强加。
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The simulation results show that the improved asway mechanism can complete the asway process in 0.4 s with a more accurate asway angle, which proves that the servo electromotor driven asway mechanism is reasonable and can provide a reliable theoretic basis for optimizing the structure of the laser cutting fracture splitting notch machine.
仿真结果表明,改进后的摆头机构可在0.4s内完成摆头动作,且摆动角度调整方便,说明改进后的摆动机构是较理想的激光头摆动方案,可为连杆初始裂解槽激光加工主机结构优化提供可靠的理论依据。
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The research indicated that the main electric particles forming guiding discharge channel were the electrons released from the process of the breaking up of the negative ions. During 10 microseconds after the laser pulse, the electrode also could guide discharge effectively; and it suggested the new conception of the electrode erosion, and developed new-type running disk electrode, which could discharge for a million times in atmosphere. It also suggested methods of the texturing roller of besmearing with oil film and cathodal discharge in processing. The research of the texturing roller indicated that roughness of 14 microns and the intensified depth of over 200 microns could be got.
研究表明:形成诱导放电通道的带电粒子主要是负离子解离过程释放的电子,在激光脉冲结束后10微秒内,电极都能有效诱导放电;提出了电极损耗的新概念,并研制了新型转动圆盘电极,可在大气中完成上百万次放电,提出了加工过程中负极性放电、工件表面涂介质薄膜放电的毛化工艺方法;并用之对轧辊试件进行了毛化工艺研究,毛化粗糙度可达14微米,强化深度大于200微米。
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(1)Bullae of lung ruptured spontaneous pneumothorax is the best indication for VATS,which has the advantages of less trauma and ache,short operation time,quick recovery and small incision;(2)Recurrent unilateral spontaneous pneumothorax with contineous air leakage of 7 days after closed thoracic drainage,bilateral spontaneous pneumothorax should be treated by VATS;(3)Spontaneous pneumothorax with pleura adhesion can be treated by pneumonolysis and bullae of lung excision under thoracoscopy assisted small incision operation.
疗效满意。结论:(1)肺大泡破裂自发性气胸是胸腔镜手术最佳的适应证,与传统开胸手术相比,胸腔镜手术具有患者创伤小,手术时间短,术后疼痛轻,康复快,符合美容要求等特点;(2)反复发作的单侧自发性气胸,行胸腔闭式引流术后持续漏气7d,双侧自发性气胸,不论是否同时发作都可考虑胸腔镜手术治疗;(3)自发性气胸并胸膜粘连可用胸腔镜辅助小切口行粘连松解肺大泡切除术;(4)为减少一次性材料的消耗,降低手术成本,可辅助小切口使用常规胸科手术器械完成手术;(5)为减少术后复发率需行胸膜固定术。
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The unit can detect the position of withdrawable part and status such as circuit-breaker and earth switch, through I/O function-module control earth switch and withdrawable part.
监控单元软件完成了对可抽出部件的位置及接地开关和断路器等状态的检测,通过I/O模块实现对接地开关和可抽出部件的控制。
- 推荐网络例句
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Do you know, i need you to come back
你知道吗,我需要你回来
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Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.
1〕 杨银书,王祥生,李德昌。安徽省首次发现嗜群血蜱。
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Chapter Three: Type classification of DE structure in Sino-Tibetan languages.
第三章汉藏语&的&字结构的类型划分。