真核延伸因子-1A2基因在宫颈癌侵袭和迁移中的作用研究

目的探讨真核延伸因子-1A2(eEF1A2)基因对宫颈癌细胞增殖、侵袭和迁移的影响。方法设计eEF1A2基因的siRNA干扰片段分别转染宫颈癌SiHa细胞、HeLa细胞和C33A细胞,实验组包括:转染Si-eEF1A2-1和SieEF1A2-2的细胞组,未转染的细胞和非干扰转染细胞(NC组)为对照组。采用Western blot方法检测eEF1A2和E-cadherin在宫颈癌细胞中蛋白质表达水平,通过划痕实验和基质胶包被transwell实验分析细胞迁移能力,通过CCK-8实验和平板克隆实验检测细胞增殖。结果宫颈癌细胞中,siRNA干扰的细胞与对照组相比eEF1A2蛋白质表达水平降低,E-cadherin蛋白质表达水平升高,差异具有统计学意义(P0.05);划痕实验si-eEF1A2转染的细胞与对照组相比较,愈合间隙宽,差异有统计学意义(P0.05); Transwell迁移实验,RNA干扰的细胞与对照组相比,穿过小室基底膜的细胞明显少于对照组,差异有统计学意义(P0.05); si-eEF1A2干扰的细胞CCK8增殖实验、细胞克隆形成实验中可以抑制宫颈癌细胞增殖,差异有统计学意义(P0.05)。结论降低宫颈癌SiHa、HeLa和C33A细胞eEF1A2基因表达水平,可以抑制癌细胞的侵袭和迁移。     

甲基乙二醛诱导牙周膜成纤维细胞基因表达与分析

运用基因芯片研究甲基乙二醛诱导人牙周膜成纤维细胞基因表达谱的变化。原代培养人牙周膜成纤维细胞,诱导组以终质量浓度为0.1 g/L的甲基乙二醛刺激培养细胞,对照组不含甲基乙二醛。24 h后收获细胞,提取mRNA,逆转录cDNA时用Cy3和Cy5荧光染料标记,制备成cDNA探针,与表达谱芯片进行杂交、扫描和分析。芯片检测结果用实时定量聚合酶链反应验证和生物信息学分析。结果共有18条基因显著差异表达,其中上调基因有11条,下调基因有7条,差异性表达的基因按功能可分为程序性细胞死亡、信号转导、细胞因子、代谢酶类、载体蛋白和未知基因等。与程序性细胞死亡、信号转导和细胞因子相关基因的差异表达可能是甲基乙二醛通过线粒体信号通路,诱导人牙周膜成纤维程序性细胞死亡,破坏牙周组织增生,从而导致牙周病发生的机制。     

应用表达谱基因芯片筛选植物激活蛋白处理水稻相关差异基因

应用基因表达谱检测植物激活蛋白处理水稻相关差异基因的表达,建立相关基因表达谱。用Cy5和Cy3分别标记激活蛋白处理和对照cDNA,将两种荧光探针混合,与载有10368位点的水稻表达谱cDNA基因芯片进行杂交,并用芯片扫描系统进行扫描,通过Cy5与Cy3信号强度比值的计算研究基因的表达差异。共获得97个差异表达基因,其中上调基因4个,下调基因93个。应用基因表达谱芯片成功筛选了植物激活蛋白处理水稻差异表达的基因,为深入揭示该激活蛋白的作用机制研究提供依据。     

应用cDNA微阵列芯片筛选胃癌转移相关基因的初步研究

采用cDNA微阵列技术建立胃癌原发灶和淋巴结转移灶基因表达谱,识别和克隆胃癌转移相关基因。用含10000个已知基因和7000个EST的cDNA微阵列分析胃癌原发灶和淋巴结转移灶表达谱的变化,利用生物信息学分析差异表达基因, RT-PCR和反向Northern点杂交验证cDNA微阵列结果。发现2倍以上的差异表达基因601个,其中淋巴结转移灶中表达上调527个,表达下调74个;2倍以上的差异EST 71个,其中淋巴转移灶中表达上调62个,表达下调9个。在胃癌原发灶中,与细胞免疫、发育、信号转导功能相关基因存在高表达;而在淋巴结转移灶中,与细胞生长、细胞周期、细胞运动和粘附功能相关基因存在高表达。RT-PCR和反向Northern点杂交结果进一步证实carbonic anhydraseⅡ、IGFBP-4基因高表达与胃癌转移相关。通过分析胃癌原发灶和淋巴结转移灶表达谱的变化,发现一些与胃癌转移相关的基因和EST,为进一步寻找和克隆胃癌转移相关基因提供研究线索。     

利用大麦寡核苷酸芯片进行小麦苗期叶片热胁迫基因表达谱分析

植物感受热胁迫时基因表达发生变化，而这些差异表达的基因对植物耐热性起着至关重要的作用.为揭示小麦热胁迫响应的分子机理，以38℃热胁迫的小麦幼苗为处理组(HS)，同期未经处理的小麦幼苗为对照组(CK)，分别提取叶片RNA与Affymetrix Barley1基因芯片杂交.杂交结果显示，在总共22840个探针中，对照组(CK)和热胁迫组(HS)共检测到8486个阳性探针，占总探针数的37.15%.利用半定量RT-PCR技术对11个差异表达基因的表达模式进行验证，发现10个基因与芯片的表达类型完全一致. 利用Gene Ontology的GO information对差异表达的基因进行了分类，表明差异表达的基因涉及逆境胁迫、信号转导、物质运输、光合作用、蛋白代谢、脂肪代谢、碳水化合物代谢等多个方面.其中有大量热激蛋白和分子伴侣相关基因上调表达.上调表达的热激蛋白包含热激蛋白各个家族，且上调表达的平均倍数明显高于其他基因的上调倍数.另外泛素—蛋白酶体通路中的多个关键酶的基因也发生了差异表达，预示着负责蛋白质选择性降解的泛素—蛋白酶体通路也参与了植物对热胁迫的应答机制.     

宫颈癌组织差异表达基因的检测及分析

选取三例经分型明确为HPV16感染的宫颈癌病例,取癌组织(T)、癌旁组织(N)及远瘤正常宫颈组织(F)标本,用Roche NimbleGen芯片系统筛选出差异表达的基因并进行分析.三例标本中,癌组织与远瘤正常宫颈组织相比,差异表达基因共有673个,其中261个上调,412个下调;差异表达基因主要有原癌基因、抑癌基因、细胞信号转导、代谢、免疫应答、细胞受体、蛋白翻译合成有关基因等.     

用基因芯片研究苦丁茶甙对K562细胞基因表达的影响

以人红白血病K562细胞株为材料，应用基因芯片技术研究苦丁茶甙对人红白血病K562细胞作用前后基因表达的差异，以诱导分化药物羟基脲处理作为正对照，分别提取药物处理前后细胞RNA进行逆转录cDNA，使获得的cDNA分别标记上Cy3和Cy5两种荧光物质；然后与由1632条cDNA片段制作的基因表达谱芯片杂交，经扫描及对获得的数据用相关软件分析，确定K562细胞经苦丁茶甙处理前后差异表达基因48条，有41条与羧基脲处理相同，其中上调表达的基因有32条，下调表达的基因有16条，这将为进一步建立基因芯片技术药物筛选模型奠定基础。     

基于基因表达谱芯片杂交分析Lamprey-PHB2转染前后Chang liver细胞的基因表达差异

选取了10个物种与本课题组前期克隆得到的东北七鳃鳗抗增殖蛋白2(Lm-PHB2)进行氨基酸序列相似性对比,检测PHB2基因进化水平,结果表明各物种的PHB2氨基酸序列在PHB结构域处高度保守,但在N-端和C-端氨基酸序列保守性较低.将重组质粒pEGFP-N1-Lm-PHB2瞬时转染入张氏肝(CHL)细胞后,利用基因表达谱芯片技术分析基因的表达差异.结果显示CHL细胞中共有270条显著差异表达基因,其中显著上调基因共141条,显著下调基因共129条,涉及细胞信号转导、细胞周期调节、细胞增殖、细胞代谢和细胞凋亡等多个方面.通过实时荧光定量聚合酶链式反应(PCR)对基因表达谱芯片分析结果进行验证,结果显示转染pEGFP-N1-Lm-PHB2质粒后,细胞周期基因CDC25C、氧化应激相关基因(CAT,SOD,GST)和抗细胞凋亡基因HAX1均有显著性差异.     

人p16^INK4cDNA探针在非小细胞肺癌研究中的应用

制备总RNA,RT－PCR克隆p16^INk4cDNA,测序验证,制备探针,进行PCR产物Southern杂交检测非小细胞肺癌组织标本中p1^^INK4基因第二外显子阴性杂交率为12．9％（4／31）,原位杂交显示p16^INK4基因转录阴性率为22．6％（7／31）,结果说明克隆的p^INK4cDNA是正确的。可用于临床基因诊断,p^16INK4基因变异及表达在非小细胞肺癌的、发展中起作用。     

PTP4A3基因在胃癌患者中的表达及对肿瘤细胞MGC-803活性的影响

目的探讨PTP4A3基因在胃癌患者中的表达及对肿瘤细胞MGC-803活性的影响.方法收集胃癌组织标本156例,癌旁正常胃组织标本32例,检测PTP4A3基因编码蛋白的表达水平.使用脂质体2000试剂将特异性沉默PTP4A3基因的siRNA序列转入MGC-803细胞(PTP4A3-siRNA组),将空载体基因序列转入MGC-803细胞(PTP4A3-NC组),同时设置空白对照组,检测细胞增殖、迁移、侵袭能力.结果胃癌组织中PTP4A3基因编码蛋白相对表达量为0.92±0.04,明显高于正常胃组织中的0.21±0.07,差异具有统计学意义(P0.01); PTP4A3-siRNA组MGC-803细胞中PTP4A3 mRNA和蛋白相对表达量明显低于空白对照组、PTP4A3-NC组,差异具有统计学意义(P0. 01);培养48、72、96 h时,PTP4A3-siRNA组MGC-803细胞增殖能力明显低于空白对照组、PTP4A3-NC组,差异具有统计学意义(P0.05); PTP4A3-siRNA组迁移和侵袭细胞数明显少于PTP4A3-NC组和空白对照组,差异具有统计学意义(P0.01).结论 PTP4A3基因编码蛋白在胃癌组织中呈高表达,下调PTP4A3基因表达能有效降低胃癌细胞增殖、迁移、侵袭能力,可作为胃癌治疗的靶基因进行深入研究.     

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.     

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.     

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.     

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.     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

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.     

The Analects and the Moment in Peking——The influence of a Confucian education system on the personality formation,the way of thinking and the fate of the main characters

0.Preface China has long been boasting of its colorful and immense culture which comprises of Taoism,Confucianism and Buddhism.The interwoven influence among the religions on Chinese way of thinking,on the nation＇s behavior in their social life throughout the long history is beyond list.