查询词典 diversity

Molecular systematics on germplasm resources of oak silkworm, Antheraea pernyi, including genetic diversity, cultivar taxonomy and microevolution within species, were investigated using Random Amplified Polymorphic DNA , mtDNA sequence analysis and population genetic analysis.

中文题名柞蚕种质资源的分子系统学研究副题名外文题名 Molecular systematics on germplasm resources of Antheraea pernyi 论文作者刘彦群导师鲁成向仲怀学科专业特种经济动物饲养学研究领域\研究方向蚕的生物技术与遗传育种学位级别博士学位授予单位西南农业大学学位授予日期2003 论文页码总数143页关键词蚕种质资源柞蚕馆藏号BSLW /2003 /S885 /1 柞蚕业是我国的一项传统产业，在现代国民经济中仍然具有资源配置、经济和生态的合理性，有着广阔的发展前景。

Objective To investigate the effects of different fecal DNA extraction methods on the molecular analysis of the diversity of gut microflora.

目的比较不同粪便总DNA提取方法对肠道菌群多样性研究的影响。

The Lower/Upper Cretaceous boundary in Songliao Basin is,therefore,between the Quantou and Denglouku formations,instead of between the Quantou and Qingshankou formations.2.The dark mudstones and shales in the Member 1 of Qingshankou Formation are of high organic carbon and low diasteranes contents.Organic geochemical characters are illustrated by biomarkers of 28,30-bisnorhopane and gammacerane,and positive excursion of kerogen isotopes.It is suggested that the dark mudstones and shales in the Member 1 of Qingshankou Formation are the products of lake anoxic period.It corresponds to the oceanic anoxic event at Cenomanian-Turonian boundary in Cretaceous.3.Based on the study of biostratigraphy,chronostratigraphy,magnetostratigraphy and event stratigraphy,a correlation of the lacustrine sequence to marine standard has been proposed,i.e.,the Quantou Formation corresponds to Cenomanian stage,Qingshankou Formation correlates to Later Cenomanian-Early Turonian,Yaojia Formation to Later Turonian-Coniacian,Nenjiang Formation to Santonian-Campanian.Sifangtai and Minshui Formations to Maastrichtian. 4.Analysis of lithology,lithofacies and microfossils of Cretaceous in Songliao Basin, shows that shore and shallow lake facies yield the most abundant microfossil groups,and the predelta and deltaic distributary plain facies rich in fossils as well.In the shore and shallow lake areas during the high level periods(such as Qingshankou and Nenjiang sedimentary periods),the lacustrine biota are of high diversity and high abundance.

因此，松辽盆地上、下白垩统的界线应在泉头组的底界，即泉头组与登娄库组之间，而不是泉头组的顶界。2、青山口组一段黑色泥岩、页岩具有有机碳含量高、重排甾烷含量低，生物标志物出现28，30—双降藿烷和伽马蜡烷，干酷根碳同位素具有正向偏移等有机地球化学特征，表征为青山口组一段黑色页岩、油页岩是古湖泊缺氧事件的产物，它对应于白垩纪古海洋Cenomanian—Turonian期界线附近缺氧事件，二者具同步性。3、通过生物地层学、年代地层学、磁性地层学和事件地层学研究，认为泉头阶大体相当于Cenomanian阶，青山口阶相当于晚Cenomanian—早Turonian阶，姚家阶对应于晚Turonian—Coniacian阶，嫩江阶对应于Santonian—Campanian阶，四方台阶和明水阶相当于Maastrichtian阶。4、通过对松辽盆地上白垩统的岩性、岩相及微体化石分析，认为滨浅湖相是微体生物群最为发育的相带，其次为三角洲前缘相和三角洲分流平原相。

While this diversity and size makes Middlesex one of the largest universities in the UK, each of its five campuses is small enough to be friendly and welcoming.

虽然本校的规模和多元性使之成为全国最大的学校之一，但它的5个校区却小巧而友善温馨。

Their study, just published in American Mineralogist , explores the history of minerals by identifying how much of the diversity was created by the rocks alone and how much of it was created by the evolution of life.

他们的研究刚发表在美国矿物学报上，通过识别有多少多样性是由岩石独自产生的有多少是随着生命进化产生的来揭示矿物历史。

This study was carried out in collective-owned summer grassland in Ganchaitan, which is located at the south foot of eastern Lenglongling Mountain (a branch of north Qilian Mountain), with yak and Tibetan sheep miscellaneously grazed on it. The grassland type could be classified as alpine meadow, dominated by Potentilla froticosa shrub. This study, under grads grazing stress, focused on the community structure, composition, species diversity, above-ground biomass of PFS, by using pane net sampling based on spatial distribution in stead of temporal succession. Results showed that: Grazing stress negatively related to the distance between grazing area and resident area.

以祁连山北支冷龙岭东段南麓的甘柴滩夏季牧场集体长期混合放牧的高寒金露梅Potentilla froticosa灌丛草场为对象，利用空间分布代替时间演替的方法，采用方格网法取样分析调查，对不同放牧压力梯度下金露梅灌丛群落的结构、组成、物种多样性、地上生物量进行研究，结果表明：①放牧居住点由远到近，放牧压力梯度不断增加，金露梅株高、密度、覆盖度、地上生物量和丛间草地的地上生物量均有不同程度的降低，地上的总生物量降低幅度达84.77%。

They have diversity requirements of the data, the distribution of variables, the efficient of the misclassification, the result of the estimation function.

从数据的要求、对索赔的分布特点要求、数据的缺失影响、参数的估计、识别的准确率、错误率等角度进行模型的比对分析。

The "Diversity Institute" at Misericordia describes its' mission in this way:"The Institute sees as its primary goal working collaboratively with community members to promote multi- cultural understanding and the elimination of all forms of discrimination."

在Misericordia大学的"多元化研究院"，以这样的一种方式描述了它的任务："该研究院的主要目标是与社会成员共同努力，以促进对多元文化的了解和消除一切形式的歧视。"

In the process that should reform in rural integrated form a complete set particularly, basic level structural reorganization of farming ability promotion mentions schedule to come up, should pass clear function, straighten system, optimize a series of reform such as mechanism of layout, compact personnel, contented a gleam of, innovation and perfect arrange - 13- is applied, propose form with the country orgnaization of farming ability promotion is dominant, organization of rural collaboration economy is a foundation, the unit such as agricultural scientific research, education is mixed experience farming enterprise is participated in extensively, cooperation of division of labor, service reachs the designated position, the total direction that system of farming ability promotion regards red-blooded diversity basic level as reform.

非凡要在农村综合配套改革的过程中，把基层农技推广机构改革提到议事日程上来，要通过明确职能、理顺体制、优化布局、精简人员、充实一线、创新机制等一系列改革和完善措-13-施，把构建以国家农技推广机构为主导，农村合作经济组织为基础，农业科研、教育等单位和涉农企业广泛参和、分工协作、服务到位、布满活力的多元化基层农技推广体系作为改革的总方向。

This is the webpage of Molecular Diversity.

这是《分子多样性》的网页。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。