EL-4荷瘤鼠单链噬菌体抗体库的构建

目的:构建一个EL-4荷瘤鼠的单链噬菌体抗体库,为筛选高特异性和高亲和力的单链抗体做准备.方法:于C57小鼠腋区接种EL-4细胞,待肿瘤长大后,从脾细胞中提取总RNA,RT-PCR技术扩增小鼠抗体重、轻链可变区基因(VH、VL),用Linker奖VH和VL基因连成单链抗体可变区片段(scFv).双酶切后(Not Ⅰ、Sfi Ⅰ)与预备好的pCANTAB5E噬粒载体连接,转化入感受态TG1,构建EL-4荷瘤鼠的单链噬茵体抗体库.随机抽取转化后的20个克隆,用以检测外源DNA的转入情况.结果:PCR扩增出的VH约有340bp和VL约有320bp,scFv的长度约有750bp.转化后的TG1约有1.67×107个茵落,随机挑取20个克隆,双酶切显示五分之一的茵落转化了外源DNA片段,有效库容为3.34×106.结论:成功构建了EL-4荷瘤鼠的单链噬茵体抗体库.     

噬菌体筛选技术筛选与联萘酚(BINOL)相结合的抗体

利用噬菌体展示技术筛选只结合1种对应体的BINOL抗体,建立人类单链抗体(scFv)噬菌体文库--Griffin.1文库,以固相化抗原淘筛抗体库,ELISA鉴定噬菌体抗体.从经过4轮富集的次级抗体库中挑选到噬菌体克隆,用该克隆制备的单链抗体阳性克隆,经ELISA证实具有良好的抗原特异性.从人类scFv噬菌体文库中获得抗BINOL的特异性抗体.     

一种噬菌体质粒的构建及其在抗体库模型筛选中的应用

目的 噬菌体展示技术(Phage display technology, PDT)是一种独立于任何免疫系统并在体外进行筛选多肽或者抗体的一种技术,可以从噬菌体抗体库中筛选得到特异性结合的单克隆抗体(monoclonal antibody)。本研究提出了一种应用于噬菌体抗体库筛选的质粒构建方法,旨在提高噬菌体展示技术的筛选效率。方法 首先将编码整个抗体结合域的基因(以单链可变片段scFv的形式)融合到基因III,并在融合噬菌粒scFv-PIII间引入牛凝血酶(thrombin)酶切位点,通过SDS-PAGE及Western Blot实验验证牛凝血酶特异性洗脱效果,同时利用ELISA(酶联免疫吸附实验)及噬菌体滴度检测特异性洗脱后单链抗体的结合活性,最后根据该质粒设计一种新的模型筛选方法,验证筛选效率。结果 本研究成功构建目标质粒并利用该质粒进行模型筛选,证实筛选效率得到提高。结论 在构建噬菌体抗体库的噬菌粒载体上添加牛凝血酶特异性酶切位点的筛选方法,可以减少筛选轮次高效筛选出特异性噬菌体抗体。     

鼠源抗AFB1噬菌体单链抗体库的构建与鉴定

研究以AFB1-BSA免疫的小鼠脾脏细胞为试验材料,利用RT-PCR技术,克隆了抗AFB1抗体重链和轻链可变区基因VH和VL,利用连接肽(Gly4Ser)3将VH和VL链接成单链抗体基因scFv,通过噬菌体展示载体pCANTAB-5E携带将其电转化E.coli TG1,经氨苄青霉素平板筛选,构建了库容为2.13×109 cfu/μg DNA的噬菌体单链抗体库,抗体库的克隆阳性率达到100%,且多样性良好,为高活性抗AFB1单链抗体的筛选提供了材料基础。     

抗弓形虫噬菌体单链抗体库的构建及筛选

采用弓形虫可溶性抗原攻击的小鼠,取小鼠脾脏从中提取细胞总RNA,通过RT-PCR扩增鼠源抗体VH和VL基因,并采用重叠PCR (SOE-PCR)方法构建ScFv基因,将其克隆入噬粒载体pCANTAB5E中,转化于感受态大肠杆菌TG1,通过辅助噬菌体M13K07援救构建噬菌体单链抗体库.从20个噬菌体克隆中筛选到15个具...     

抗口蹄疫病毒phage-scFv及可溶性scFv的构建

利用重组DNA技术在抗口蹄疫病毒单克隆抗体1C 7 VH基因和VL基因之间导入一段连接肽[(G ly4Ser)3],采用重叠延伸拼接法,经聚合酶链反应(PCR)扩增获得scF v基因。将scF v基因克隆至噬菌粒pCANTAB 5E载体,转化E.coli TG 1,构建噬菌体抗体文库。用M 13KO 7辅助噬菌体挽救及固相口蹄疫病毒(FMDV)抗原对噬菌体抗体文库的三轮“吸附-洗脱-扩增”的淘洗,筛选出scFv阳性克隆。将阳性克隆转化E.coli BH 2151,通过异丙基硫代-β-D-半乳糖苷(IPTG)诱导可溶性scFv蛋白的表达。酶联免疫吸附实验(EL ISA)检测表明:scFv克隆表达的phage-scFv及可溶性scFv与FMDV亲和力高,特异性强。     

人源性抗HBc单链噬菌体抗体库的构建

利用RT－PCR和噬菌体表面展示技术，直接从乙肝病毒核心抗体（抗HBc）阳性患淋巴细胞中提取总RNA，反转录成cDNA；合成全套人抗体可变区引物扩增抗体可变区基因，并将重、轻链可变区基因进行拼接装配成单链抗体（ScFv）基因，重组于噬菌粒载体pHEN1，转化抑制型大肠杆菌E.coliTG1，以辅助噬菌体援救后，构建成人源性单链噬菌体库。库容量达106。     

从噬菌体抗体库中淘选人绒毛膜促性腺激素的单链抗体

由鼠源噬菌体抗体库淘选到展示有人绒毛膜促性腺激素单链抗体的噬菌体克隆。用ELISA方法进行检测,从结合力最强的克隆中分离单链抗体基因,插入经改造的高效表达载体pET-21a(+)中,转化大肠杆菌,诱导表达。从培养基中可检测到可溶性抗人绒毛膜促性腺激素的单链抗体。     

小鼠噬菌体抗体库的构建和N-肽结合单链抗体的筛选

成功构建一库容量为1.7×10⁸的小鼠噬菌体抗体库,并从中淘选出对N-肽有结合活性的单链抗体。首先从未免疫小鼠的脾脏中提取总RNA,分离出mRNA,经逆转录合成其总cDNA。随后通过PCR分别扩增出抗体重链和轻链可变区V_H、V_L的基因片断,再经重组PCR将两片断由一编码(Gly₄Ser)₃十五肽的接头连在一起,并克隆到噬菌质粒pCANTAB 5E中,电击转化大肠杆菌TG1。经辅助噬菌体M13KO7超感染回收全部重组噬菌体,此即噬菌体抗体库。N-肽是一种新发现的神经肽,其N端与阿片肽高度同源,可与阿片肽受体相互作用。对其研究可能有助于了解成瘾机制和有临床应用价值。将生物素化的N-肽与抗体库相互作用,用偶联有链霉亲和素的磁珠富集与N-肽结合的重组噬菌体,经四轮淘选,得到亲和力较高的单链抗体。     

SARS-CoV刺突蛋白受体结合区的表达及高潜在中和性人源抗体的制备

为表达SARS-CoV刺突蛋白S(Spike)受体结合区(RBD)并从中筛选高潜在中和性人源抗体,我们用原核表达并纯化的SARS-CoVSRBD进行抗体库的筛选。从多个曾患SARS的健康人血中获得淋巴细胞,PCR扩增全部抗体基因,插入Pcomb3x载体中,构建抗SARS病毒人源噬菌体抗体库。利用噬菌体表面呈现技术,从中筛选结合SARS-CoVSRBD的人源抗体并用ELISA及Westernblot鉴定阳性克隆,竞争ELISA检测人源抗体阻断SARS-CoVSRBD与其受体ACE2的结合情况。结果为构建了库容量6.2×107的免疫Fab噬菌体抗体库,重组率为75%,从中筛选获得9株特异抗SARS-CoVSRBD的人源Fab抗体,ELISA及Westernblot检测均为阳性。其中有一株能阻断SARS-CoVSRBD与其受体ACE2的结合。本实验结果表明:人源抗SARS-CoVSRBD基因工程抗体的获得,一方面将对SARS疾病的特异性预防,治疗和诊断提供新的途径,同时也提示SARS-CoV亚单位疫苗可以用于SARS疾病的预防。     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

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

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