从动物血液中提取基因组DNA方法的比较研究

从血液中提取基因组DNA的传统方法是先得到淋巴细胞,再用蛋白酶K、SDS消化,然后用酚、氯仿抽提,乙醇沉淀．CTAB法提取基因组DNA多应用于植物和微生物,从全血中提取基因组DNA报道甚少．采用改良的CTAB法从全血中提取基因组DNA,并以传统方法和TAKARA Blood Genome DNA Extraction Kit作对照．结果表明：CTAB法可以得到大量的、较完整的基因组DNA,并且纯度达到1．8～2．0,可以满足PCR扩增和限制酶切等实验的要求．     

摇蚊基因组DNA的提取方法研究

采用动物基因组DNA快速抽提试剂盒法、SDS法、CTAB法、NaCl法4种方法提取摇蚊基因组DNA.通过紫外分光光度计分别检测所得样品DNA在波长为260nm和280nm的吸光值,根据A260/A280的比值检测其纯度和浓度.采用PCR技术获得摇蚊COI基因,用琼脂糖凝胶电泳检测PCR-COI.综合分光光度法与电泳结果筛选出最适合提取摇蚊基因组DNA的方法.结果表明:SDS法所得样品DNA纯度最高,试剂盒法所得DNA浓度最大.同时综合比较DNA纯度与浓度分析得出:试剂盒法SK8222(改良)提取摇蚊基因组DNA为最佳方法,其次为SDS法或CTAB法(改良).     

全血基因组DNA3种提取方法的比较

目的:比较从全血中3种提取DNA方法所需要的时间、样本量、提取的DNA纯度、产量以及方法本身的优缺点.方法:采用蛋白酶K法、氯仿.异戊醇法、碘化钾法直接从全血中提取基因组DNA.结果表明:3种方法所提取的DNA质量均能达到分子生物学的实验要求,但碘化钾法提取的DNA纯度最高,且操作时间最短,该法简便、快速和DNA收获率高.     

用Chelex-100法大规模快速提取牦牛肌肉中基因组DNA

旨在建立快速、大规模提取牦牛(Bos grunniens)肌肉中基因组DNA的方法.试验样品为冰冻保存的九龙牦牛背最长肌(n=10).采用两种取样方法(镊子取样和枪头取样)采集冰冻的肌肉样品,用Chelex-100方法提取其中的基因组DNA,并进行PCR扩增.结果显示,镊子取样和枪头取样提取的基因组DNA,均可用于两个核基因和一个线粒体基因的PCR扩增,但枪头取样简便易行,提取的DNA用PCR扩增细胞色素b,扩增35个循环数的PCR产物可直接测序.表明Chelex-100法可用于快速提取牦牛肌肉中基因组DNA,操作简单,成本低廉,适用于大规模提取组织中的DNA.     

大草履虫总DNA的提取方法比较

快速而稳定地提取大草履虫的基因组DNA是进行后续分子生物学研究的前提.文章通过比较传统SDS法、CTABⅠ法和CTABⅡ法等提取大草履虫DNA的效果,进一步优化提取方法,获得快速稳定地提取大草履虫基因组DNA的方法.结果表明:用CTAB I法提取的DNA浓度低,杂质较多;CTABII提取的DNA电泳时检测不出条带;而SDS法提取的DNA在电泳时带型较整齐,无降解,且DNA的得率和纯度较高,但仍有蛋白质污染.针对蛋白质的去除,用SDS-蛋白酶K法和SDS-NaAc法来提取DNA,经过试验发现这2种方法都能够很好地去除蛋白质,所获DNA样品的纯度和得率都能用于进一步分子试验,而SDS-NaAc法更经济适用.     

不同类型DNA提取试剂盒提取牦牛乳粉DNA效果的比较

以牦牛乳粉为材料,采用了细胞/组织/血液基因组提取试剂盒、植物基因组提取试剂盒及食物核酸提取试剂盒3种不同类型的DNA提取试剂盒提取牦牛乳粉的基因组DNA,使用核酸和蛋白质分析仪检测后表明3种提取方法获得的DNA浓度相近;使用牦牛线粒体中细胞色素b的DNA序列特异性探针引物对所得的3种DNA进行实时荧光PCR,都获得了特异性扩增。结果表明3种类型的DNA提取试剂盒提取的牦牛乳粉基因组DNA都可以用于牦牛乳粉的分子特异性研究,综合提取操作的难易程度、耗时长短、成本高低及提取DNA的浓度分析,细胞/组织/血液基因组提取试剂盒为最佳选择。但食物核酸提取试剂盒的提取步骤简单,消解更彻底,更适用于一次性提取较多样本的基因组DNA。     

用改进的CTAB法提取肉苁蓉基因组DNA

研究了肉苁蓉(Cistanche deserticola)基因组DNA的分离提取方法.由于肉苁蓉组织内含有大量的多糖类及蛋白等物质,严重干扰DNA的抽提,在对其进行若干预处理之后,采用改进的CTAB法提取基因组DNA.根据外观、琼脂糖凝胶电泳检测、D260/D280的测定和PCR扩增表明,用改进的CTAB法提取肉苁蓉基因组DNA,所得DNA无论是纯度还是完整性都比较好,可以直接用于RAPD反应体系.     

三种血液基因组 DNA 提取方法的比较研究

摘要: 目的 比较采用 3 种不同 DNA 提取方法提取豚鼠血液基因组 DNA 之间的差异。方法 分别用新鲜抗凝血 NaI 手提法、血凝块手提法和试剂盒 DNA 提取法提取 20 只豚鼠血液基因组 DNA,用分光光度计测定、琼脂糖凝胶 电泳、PCR 扩增等方法对提取的 DNA 片段的完整性、浓度、纯度和用于 PCR 扩增的效果等方面进行比较研究。结 果 新鲜抗凝血 NaI 手提法提取的 DNA 完整性、浓度和纯度均为最高; 血凝块法提取的 DNA 浓度和抗凝血提取的 DNA 浓度接近但纯度最低,有一定程度的断裂和降解; 试剂盒法提取的 DNA 浓度最低,纯度和完整性处于中间,但 三种方法提取的 DNA 都可用于 PCR 扩增反应。结论 3 种方法都可以提取基因组 DNA 并且所提取的 DNA 均能 满足后续 PCR 扩增实验的要求,但每种方法各有利弊,可根据具体的条件选择适宜的方法。     

改良CTAB法对蒜头果基因组DNA提纯效果的影响

用改良的CTAB法从我国稀有植物--蒜头果种仁中提取基因组DNA,通过琼脂糖凝胶电泳和紫外分光光度法检测所提取基因组DNA的纯度.结果表明用改良的CTAB法所提取的蒜头果基因组DNA的A260/A280比值都在1.8～2.0之间,电泳条带清晰无拖尾,获得了纯度较高的基因组DNA,为蒜头果分子生物学研究及下游操作奠定了基础.     

稀有植物蒜头果基因组DNA提取方法的研究

 分别用改进的CTAB法、SDS法和高盐低pH法从蒜头果种仁中提取基因组DNA,通过琼脂糖凝胶电泳和紫外分光光度法检测所提取基因组DNA的纯度.结果表明:用改进的CTAB法、SDS法和高盐低pH法所提取的蒜头果基因组DNA的OD₂₆₀/OD₂₈₀值在1.8~2.0之间,带型清晰无拖尾,说明所提取的DNA保持完好.其中改进的CTAB法所提取的基因组DNA质量最好、纯度也最高,为蒜头果分子生物学研究及下游操作奠定了基础.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-