低温胁迫下棉花子叶蛋白质差异表达的双向电泳分析

采用TCA-丙酮沉淀法,改良优化了棉化蛋白质组研究中的双向电泳技术.通过对根和子叶全细胞蛋白的提取、蛋白的溶解、胶条的选择及电泳等环节的优化,得到了重复性很高、分辨率很好的蛋白质图谱.进一步对5 d苗龄的棉花进行4℃低温处理12 h后,提取子叶的蛋白质,利用双向电泳技术分离全细胞蛋白.并用PDQuest软件分析比较棉花子叶在低温处理下的蛋白表达谱,得到了49个有显著差异的蛋白点.其中,低温处理上调表达的蛋白点有27个,减弱表达的蛋白点有22个,推测这些差异蛋白点可能与低温胁迫相关.     

血管紧张素Ⅱ诱导小鼠心肌肥大差异表达蛋白的鉴定与分析

采用蛋白质组学方法研究血管紧张素(AngiotensinⅡ,AngⅡ)诱导小鼠心肌肥大模型中心脏蛋白差异表达的变化情况并探讨其病理生理学意义.构建AngⅡ诱导的小鼠心肌肥大模型,提取小鼠的心脏蛋白,采用双向电泳技术分离差异表达的蛋白,凝胶考染后切取差异蛋白点进行质谱检测(MALDI-TOF)分析,获取的数据采用Mascot软件在NCBInr数据库内检索.结果发现AngⅡ模型组小鼠心脏蛋白图谱中有34个蛋白点表达量与对照组有显著差异,质谱鉴定出14种差异表达的蛋白,其中高表达的蛋白有2个,低表达的蛋白有12个.AngⅡ诱导小鼠心肌肥大模型中表达有差异的蛋白主要与能量代谢、氧化应激和细胞骨架有关.     

正常与性早熟河蟹视神经节蛋白的二维电泳初步分析

利用双向电泳技术比较正常和性早熟河蟹视神经节蛋白的表达差异,旨在探索蛋白质组学技术在甲壳动物中尤其是河蟹的性早熟研究当中的应用.结果发现,明显差异的蛋白点共24个,为以后通过蛋白质组学手段筛选出真正影响性早熟发生的蛋白质或酶奠定了基础.     

白斑综合征中国对虾肝胰腺蛋白质组学研究的技术探索

建立白斑综合征中国对虾肝胰腺蛋白质组学技术体系,以患白斑综合征中国对虾的肝胰腺为研究对象,健康中国对虾肝胰腺为对照组,探索2种蛋白质组学差异蛋白的分离和鉴定的方法. 采用双向凝胶电泳(4～7固相pH梯度干胶条,10%SDS-PAGE)分离蛋白质组,银染显色,图像分析软件比较分析,识别差异蛋白,胶上扣点,处理后通过基质辅助激光解析电离飞行时间质谱（MOLDI-TOF）得到肽质量指纹图谱,软件分析后应用Mascot数据库搜索软件鉴定蛋白. 分别获得中国对虾患白斑病组及对照组正常肝胰腺蛋白质组表达图谱. 分别识别出203和107个蛋白质点. 筛选并尝试鉴定数个差异蛋白. 对各方法步骤进行了技术探讨,对实验过程提出了一系列建议. 建立了双向电泳及生物质谱方法研究中国对虾白斑病的蛋白质组学技术体系. 该体系拓宽了对虾免疫生理研究的途径,以从蛋白质水平探讨对虾发病机制,寻找有效药物靶点.     

烟草烟碱转化相关蛋白质筛选分析研究

为了研究烟草中烟碱转化机理,应用比较蛋白组学方法研究了高烟碱烟草中烟碱转化相关蛋白质表达情况.采用双向电泳联用质谱技术比较了实验组高烟碱转化烟草叶片和对照组野生型烟草叶片的蛋白质差异,获得了分辨率和重复性较好的双向电泳图谱.选取了34个差异蛋白质点,采用MALDI-TOF-TOF-MS进行肽质谱指纹图分析,最终有12个蛋白质点得到了可靠鉴定,其中在实验组中相对下调的蛋白有7个,相对上调的蛋白有5个.通过比对蛋白质组库数据,发现这些差异表达的蛋白质主要是参与碳水化合物代谢、能量代谢等功能,而且亚细胞定位主要是在叶绿体和线粒体,表明这些蛋白表达水平与烟碱转化具有密切关系,为研究高烟碱转化率烟叶的形成机理提供了新的依据.     

溴氰菊酯抗感品系小菜蛾成虫差异表达蛋白的鉴定

通过对小菜蛾Plutella xylostella(L.)抗溴氰菊酯品系和敏感品系成虫双向电泳图谱的比较,找到8个差异明显的点,并结合质谱分析技术和数据库信息检索最终鉴定出7个蛋白.其中包括2个代谢相关蛋白,2个调控蛋白,1个结构分子蛋白,其余2个蛋白质功能皆不明确.这些在抗性或敏感品系中差异表达蛋白质的发现,为进一步研究小菜蛾抗药性形成机制和抗性相关蛋白的寻找奠定了基础.     

适用于小麦叶片总蛋白分析的双向电泳技术

双向电泳技术越来越成为植物蛋白质组研究中的关键技术,样品制备、固相预制胶条水化、等电聚焦及SDS—PAGE都是影响双向电泳结果的重要步骤,本研究以晋麦47号小麦叶片为研究材料,在样品除盐、预制胶条水化方式、第二向SDS—PAGE电压选择方面进行了探索与优化,通过比较双向电泳图谱,建立适用于小麦叶片总蛋白质分析的双向电泳技术体系．结果表明：样品经多步除盐并加长除盐时间后进行双向电泳,蛋白能较好地被分离,2-DE图谱蛋白点较多,分辨率较高;IPG胶条先后经被动水化与主动水化比仅主动水化的2-DE图谱蛋白点损失少;第二向SDS—PAGE中电压选择120V较200V的2．DE图谱蛋白点拖尾少,纹理现象少．     

肝癌细胞株HepG-2的G1期细胞蛋白质组双向电泳图谱的建立

采用双向电泳分离肝癌细胞株 HepG2 的 G1 期细胞的蛋白质,经考马斯亮蓝染色及图像扫描与分析显示:在 pH3-10,13 cm 的 IPG 胶条上,可分离到 227 个重复性及分辨率均较好的蛋白斑点,蛋白斑点的匹配率为 84%.建立了 HepG2 的G1 期细胞蛋白质组双向电泳图谱,为其蛋白质组学的进一步研究奠定了基础.     

采用比较蛋白质组学方法研究p38β激酶对293T细胞蛋白质表达的影响

采用比较蛋白质组学方法研究了过表达p38信号通路激酶p38β对人类肿瘤细胞293T细胞蛋白质表达的影响,利用双向电泳和质谱技术分离鉴定了13个差异表达蛋白质.这些差异蛋白的分布从细胞质膜到核,其功能涉及核酸、蛋白质、糖脂类分子的转录、合成和成熟,细胞物质跨膜运输,细胞周期调控以及细胞防御等.文献分析并没有发现上述鉴定的差异表达蛋白是p38β激酶现有直接底物的证据,提示其可能为新的p38β激酶相关蛋白.这些结果表明,比较蛋白质组学方法是寻找激酶新靶标的一种有效工具.     

蚯蚓蛋白质组学研究中3种总蛋白提取方法的比较

双向电泳(2-DE)技术在现阶段的蛋白质组学研究当中,由于其价格相对便宜,仪器设备相对简单而被广泛应用.合适的总蛋白质样品制备方法,可以提高双向电泳蛋白点的数目和分辨率以保证蛋白质组信息的完整性,是整个实验的关键.蚯蚓作为土壤污染和土壤生态毒理学研究的重要生物,其总蛋白质提取的方法学研究还不完善.通过对已发表的文献中的蛋白提取方法进行筛选和优化,利用SDS-PAGE电泳和双向电泳的结果,对三氯乙酸-丙酮沉淀法、裂解液法和酚抽提法对蚯蚓总蛋白提取结果进行了评价,建立了适合蚯蚓蛋白质组学研究的总蛋白样品制备方法.     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that