广西巴马小型猪肌肉生长抑制素(Myostatin)cDNA克隆和序列分析

目的通过RT-PCR扩增广西巴马小型猪Myostatin cDNA序列,经过连接、转化、克隆测序后,与NCBI中发表的猪Myostatin序列进行同源性比较,分析广西巴马小型猪Myostatin的cDNA序列结构特点及与其他物种间的聚类关系,为日后构建Myostatin高效表达载体及进一步研究Myostatin对广西巴马小型猪肌肉生长的影响奠定基础。方法以广西巴马小型猪的肌肉组织总RNA为模板,应用逆转录-聚合酶链式反应(RT-PCR),利用合成的特异性引物,扩增得到巴马小型猪肌肉生长抑制素(Myostatin)cDNA的全序列。该扩增片段经纯化后,连接到pMD18-T载体上扩增,经一系列鉴定后,测序。结果本实验克隆到巴马小型猪Myostatin基因cDNA序列长度为1128 bp,与GenBank报道的猪Myostatin基因cDNA序列同源性高达99.7%,与人、奶牛、家鼠等物种的cDNA序列间同源性可达到92.3%以上,证明Myostatin基因具有较高的保守性。同时发现广西巴马小型Myostatin基因cDNA序列有三处存在碱基突变,两个为同义突变,一个为错义突变。     

猪PSMD13基因的克隆与表达谱分析

为了研究猪PSMD13基因功能,采用SMART-RACE技术对猪PSMD13基因5′和3′端进行扩增,并对其进行序列分析和组织表达分析。结果表明,得到猪PSMD13基因全长1476bp的cDNA序列,其基因编码376个氨基酸,与人、小鼠、蛙、鲐鱼的PSMD13氨基酸序列分别有97%、94%、77%、85%的同源性,含有1个PINT保守结构域和1个类似的PCI domain结构域,无信号肽序列。组织表达分析结果表明,猪PSMD13在背最长肌、心脏、肝脏、脾脏、肺脏、肾脏、卵巢、子宫、睾丸、胚胎和脂肪等组织均有表达。     

近交培育五指山小型猪GHR基因的克隆及其真核表达载体的构建

目的探讨近交培育五指山猪矮小的分子机理,为五指山猪实验动物化奠定基础。方法近交系五指山猪肝脏组织提取总RNA,然后RT-PCR成功扩增出GHR基因,克隆入pGEM-Teasy载体进行测序,并与正常猪GHR基因序列进行比对;然后经SalⅠ和XbaⅠ双酶切回收后与同样经过双酶切回收的pEGFP-C1真核表达载体连接,构建五指山猪GHR基因真核表达载体。结果测序结果表明:五指山猪GHR基因编码区包括639个氨基酸;经过酶切和测序验证五指山猪GHR基因真核表达载体构建成功。结论经序列比对后发现GHR信号肽编码区发生两处氨基酸替换,可能会影响到生长激素的胞内运输;生长激素受体胞内域编码区发生多处突变,并且导致相应氨基酸发生替换,可能会影响生长激素受体的下游信号转导。五指山猪GHR基因真核表达载体的成功构建为进一步研究GHR的功能和下游信号转导奠定了基础。     

广西巴马小型猪生长激素(pGH)基因全序列克隆及序列分析

目的克隆广西巴马小型猪生长激素(pGH)基因全序列,并与已发表的其它品种猪的生长激素(pGH)基因全序列进行比较,探讨该基因在广西巴马小型猪中可能存在的变异。方法以广西大学巴马小型猪基因组DNA为模板,扩增巴马小型猪生长激素基因的全序列,将该扩增片段亚克隆到pMD18-T载体后测序。再将测序结果在NCBI进行BLAST。结果测序结果证明克隆得到了巴马小型猪GH基因,全长为2 007 bp。同源性比较发现,巴马小型猪GH基因全序列与GenBank中发表的五指山猪、太湖猪及普通猪的GH基因全序列的同源性分别为99.4%、98.3%、93.9%。     

猪AIBP基因的克隆与组织表达谱研究

扩增了猪AIBP基因CDS和3′端,测序得到全长935bp的cDNA序列,NCBI登录号为DQ826508。猪AIBP基因编码288个氨基酸,与牛、人、鼠的AIBP氨基酸序列的相似性分别为94%、90%和87%,含有1个YjeF-N保守结构域,有信号肽序列。组织表达分析表明猪AIBP在背最长肌、心脏、肝脏、脾脏、肺脏、肾脏、卵巢、子宫、睾丸、胚胎和脂肪等组织均有表达。     

蒙古鮊ob基因的克隆与组织表达特异性的初步研究

根据已知的人和鼠ob基因序列设计引物,通过运用RT-PCR技术首次从蒙古鮊脂肪组织的RNA中扩增获得ob基因片段,并经序列分析证实为ob基因编码区438 bp的序列.不同物种同源性比较表明ob基因序列具有很高的保守性:蒙古鮊与人、猪和鼠的ob基因核苷酸编码序列的同源性分别为82.9%、84.0%和99.1%;蒙古鮊ob基因编码的蛋白leptin氨基酸序列与人、猪和鼠氨基酸同源性分别为80.8%、78.8%和95.9%.用RT-PCR技术分析组织ob基因的表达特异性,结果表明:ob基因在脂肪和肝脏组织中的表达量最大,在心脏、脾脏、肌肉、脑、卵巢中的表达量次之,在肾脏中仅微量表达,而在精巢和肠道组织中则不表达.     

家猪信号转导及转录激活因子基因3、5a及5b的克隆、剪切变体鉴定及组织表达图谱分析

本研究以家猪为材料,克隆了家猪STAT3、STAT5a、STAT5b基因的cDNA全长,序列分析显示:家猪STAT3基因cDNA编码770个氨基酸的蛋白,与人、牛、大鼠、小鼠STAT3氨基酸序列一致性高达99%;STAT5a基因cDNA编码799个氨基酸的蛋白,与人、牛、大鼠、小鼠氨基酸序列一致性分别为分别为96%,97%,95%,和95%;STAT5b基因cDNA编码787个氨基酸的蛋白,与人、牛、大鼠、小鼠氨基酸序列一致性高达98%.同时,还鉴定到STAT3的一种新剪接变体以及STAT5a的三种剪接变体.采用RT-PCR方法,我们进一步检测了这些基因mRNA在成年家猪各组织中的表达情况.STAT3在除了心脏和肌肉以外的其他被检测组织中均有较高的表达水平;STAT5a在肝脏、肾脏、脾脏、肺和卵巢中有较高的表达水平;STAT5b在所有被检测的组织中均有表达.     

广西巴马小型猪生长素(Ghrelin)cDNA的克隆及序列分析

目的扩增广西巴马小型猪生长素(Ghrelin)cDNA序列,分析其序列结构特点,为进一步从分子水平上对广西巴马小型猪的生长发育提供理论依据,也为日后构建原核表达载体、研究Ghrelin基因的生物功能奠定基础。方法以广西巴马小型猪胃底组织总RNA为模板,用特异性引物扩增Ghrelin的cDNA,纯化连接pMD18-T载体后转化大肠杆菌DH5α,筛选阳性克隆体,鉴定后测序。结果经测序证实克隆得到的广西巴马小型猪Ghrelin cDNA序列全长为357 bp,与相关文献报道一致。同源性比较发现,广西巴马小型猪Ghrelin cDNA基因序列与GenBank报道的猪相应序列同源性为99.7%,只有一处发生碱基突变。结论本实验成功克隆了广西巴马小型猪Ghrelin cDNA。     

猪Akt3基因克隆、序列分析及组织表达图谱研究

本研究以长白猪(Landrace)肌肉cDNA为模板,克隆得到长白猪Akt3基因.序列分析结果显示:长白猪Akt3基因cDNA全长1493bp,编码一个含479个氨基酸的前体蛋白,与人、牛、小鼠和大鼠的氨基酸序列一致性分别为100%、100%、99.58%、99.79%,具有高度保守性.氨基酸结构分析显示,长白猪Akt3基因都具有典型的Pleckstrin homologous domain(PH)结构域和丝氨酸/苏氨酸磷酸化激活位点.组织表达图谱分析结果显示:Akt3基因在所有检测的家猪组织中均有表达.此外,本研究还将Akt3基因编码区序列克隆转入真核表达载体pcDNA3.1(+)中,为下一步功能验证做准备.     

广西巴马小型猪卵泡抑素(Follistatin)克隆及原核表达

目的通过RT-PCR扩增获得广西巴马小型猪Follistatin的cDNA全序列,经克隆测序分析其cDNA序列结构,进而构建pET-Fo原核表达质粒,使用IPTG诱导表达获得其融合蛋白,为将来进一步研究Follistatin对广西巴马小型猪肌肉生长和繁殖性能的影响奠定基础。方法从广西大学巴马小型猪卵巢中提取总RNA,并以其为模板,应用逆转录-聚合酶链式反应(RT-PCR),在合成的特异性引物引导下,扩增获得广西巴马小型猪卵泡抑素(Follistatin)cDNA的全序列,长度为1 035 bp。将PCR产物克隆到pMD18-T载体后进行序列测定及分析。结果广西巴马小型猪卵泡抑素cDNA序列与GenBank中已报道的家猪卵泡抑素同源性高达99.4%。同时,将目的基因插入到原核表达载体pET 32a 多克隆位点中,构建了Follistatin的原核表达载体,并转化于大肠杆菌BL21。转化菌经异丙基硫代半乳糖苷(IPTG)诱导,变性聚丙烯酰胺凝胶电泳(SDS-PAGE)和蛋白质免疫印迹(Western blotting)分析。结论实验已成功地表达了Follistatin的融合蛋白(约58.4 ku)。     

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.     

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.     

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     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

正~~     

Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has