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C-myc标记肽对单链抗体与抗原结合活性的影响

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免疫学杂志 2004年第5期20卷 369-371页

作者：杨康鹃孟繁平王玉祥金桂花范华英 m.stassen m.de Baets 延边大学医学院微生物学与免疫学教研室吉林延吉133000 Laboratory of Neuroimmunology Department of NeurologyUniversity of Maastricht6202AZ MaastrichtNetherlands

目的　探讨在不同的免疫学检测方法中 ,与单链抗体相连的亲和标记肽对单链抗体与抗原结合活性的影响。方法　在制备“VH 连接链 VL”型结构抗乙酰胆碱受体单链抗体时 ,将c myc标记肽与单链抗体的VL 连接 ,应用先将抗c myc抗体固定单链... 详细信息

目的　探讨在不同的免疫学检测方法中 ,与单链抗体相连的亲和标记肽对单链抗体与抗原结合活性的影响。方法　在制备“VH 连接链 VL”型结构抗乙酰胆碱受体单链抗体时 ,将c myc标记肽与单链抗体的VL 连接 ,应用先将抗c myc抗体固定单链抗体的固相放射免疫测定法、直接将单链抗体与乙酰胆碱受体结合的液相放射免疫测定法 ,分别测定单链抗体与乙酰胆碱受体的结合活性。结果　在固相放射免疫测定法中 ,单链抗体不能与乙酰胆碱受体结合 ;在液相放射免疫测定法中 ,单链抗体则能与乙酰胆碱受体结合。结论　在应用不同的免疫学检测方法中 ,与单链抗体相连的c myc标记肽可影响单链抗体与抗原的结合活性。

关键词：单链抗体标记肽乙酰胆碱受体

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重症肌无力治疗性单价IgG抗体基因的构建

中国免疫学杂志 2009年第11期25卷 1003-1005页

作者：李钟燮孟繁平孙昌元李芳芳金权鑫李红花李英信 m.stassen m.de Baets 延边大学基础医学院免疫学与病原生物学教研部延吉133000 Department of Neurology Faculty of MedicineUniversity of Maastricht

目的:构建一株对重症肌无力(mG)具有特异性免疫治疗作用的单价IgG类抗体基因。方法:应用定点突变技术,将致病性抗乙酰胆碱受体(AChR)抗体IgG637的重(H)链第322位氨基酸进行K322A突变,获得的突变型抗体IgG637/K322A基因再进行H链互补决定... 详细信息

目的:构建一株对重症肌无力(mG)具有特异性免疫治疗作用的单价IgG类抗体基因。方法:应用定点突变技术,将致病性抗乙酰胆碱受体(AChR)抗体IgG637的重(H)链第322位氨基酸进行K322A突变,获得的突变型抗体IgG637/K322A基因再进行H链互补决定区3(CDR3)缺失突变,获得突变型抗体IgG637/K322A/CDR3ΔPLKP基因。经转化大肠杆菌XL1-Blue进行增殖后,转染哺乳类细胞CHO-k1进行表达,表达产物经ELIAS检测与补体C3的结合活性,经RIA检测与特异性抗原人AChR的结合活性。突变抗体H链再经杵(T366Y)臼(Y407T)突变,以利于异源H链的配对。结果:突变型抗体IgG637/K322A丧失了与补体C3结合的能力,突变型抗体IgG637/K322A/CDR3ΔPLKP丧失了与人AChR结合的能力。测序证实已经获得了预想的杵臼突变序列。结论:已经成功的制备了无补体激活能力的单价IgG类抗AChR抗体基因。

关键词：重症肌无力单价抗体定点突变免疫球蛋白G

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抗乙酰胆碱受体单链抗体在大肠杆菌中的表达

延边大学医学学报 2002年第2期25卷 79-82页

作者：杨康鹃孟繁平 m.stassen m.de Baets 延边大学医学院生物学教研室吉林延吉133000 延边大学医学院微生物学免疫学教研室吉林延吉133000 荷兰马斯特里赫特大学医学院神经学系

[目的 ]使构建的抗人乙酰胆碱受体单链抗体基因在大肠杆菌中表达 .[方法 ]将含有单链抗体基因的载体 pHEN2 (含有 pelB引导肽和c myc)转化大肠杆菌HB 2 15 1,在细菌外周质中表达单链抗体 .应用鼠抗c myc单链抗体的斑点杂交试验检查细菌... 详细信息

[目的 ]使构建的抗人乙酰胆碱受体单链抗体基因在大肠杆菌中表达 .[方法 ]将含有单链抗体基因的载体 pHEN2 (含有 pelB引导肽和c myc)转化大肠杆菌HB 2 15 1,在细菌外周质中表达单链抗体 .应用鼠抗c myc单链抗体的斑点杂交试验检查细菌外周质裂解物中单链抗体的表达 .[结果 ]单链抗体表达在细菌外周质中 ,培养液上清及对照大肠杆菌外周质和培养液上清均未发现单链抗体 .[结论 ]已成功地在大肠杆菌中表达了抗人乙酰胆碱受体单链抗体 .

关键词：抗乙酰胆碱受体单链抗体大肠杆菌基因表达重症肌无力

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重症肌无力单链抗体基因的制备

延边大学医学学报 2002年第1期25卷 1-4页

[目的 ]构建抗人乙酰胆碱受体主要免疫原区单链抗体 .[方法 ]应用多聚酶链反应从抗人乙酰胆碱受体主要免疫原区抗原结合片段扩增重链和轻链可变区基因 ,并克隆到载体噬粒 pHEN2 .将含有单链抗体基因的重组噬粒转化大肠杆菌DH5α ,分离... 详细信息

[目的 ]构建抗人乙酰胆碱受体主要免疫原区单链抗体 .[方法 ]应用多聚酶链反应从抗人乙酰胆碱受体主要免疫原区抗原结合片段扩增重链和轻链可变区基因 ,并克隆到载体噬粒 pHEN2 .将含有单链抗体基因的重组噬粒转化大肠杆菌DH5α ,分离提纯重组噬粒后再经酶切、琼脂糖凝胶电泳检查以确认单链抗体基因的正确性 .[结果 ]电泳检查发现了大小分别为 3 78bp ,3 3 9bp和 762bp的重链可变区、轻链可变区和单链抗体基因 ,且位置正确 .[结论

关键词：重症肌无力单链抗体基因制备胆碱能受体

人源性抗乙酰胆碱受体自身抗体的构建及特异性鉴定

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免疫学杂志 2007年第1期23卷 88-90页

作者：杨康鹃孟繁平金桂花李芳芳孙昌元金权鑫 m.stassen m.de Baets 延边大学基础医学院免疫学与病原生物学教研部吉林延吉133000 Laboratory of Neuroimmunology Department of NeurologyUniversity of Maastricht6202 AZ MaastrichtNetherlands

目的用人抗乙酰胆碱受体(AchR)自身抗体的抗原结合片段(Fab)构建完整的抗人AchR自身抗体,为重症肌无力(mG)的实验研究提供人源性抗体材料。方法应用PCR技术从分离自mG患者胸腺的Fab637扩增重链Fd片段基因和轻链基因,并克隆至含有免疫球... 详细信息

目的用人抗乙酰胆碱受体(AchR)自身抗体的抗原结合片段(Fab)构建完整的抗人AchR自身抗体,为重症肌无力(mG)的实验研究提供人源性抗体材料。方法应用PCR技术从分离自mG患者胸腺的Fab637扩增重链Fd片段基因和轻链基因,并克隆至含有免疫球蛋白(IgG1)基因的载体pIgG1上,构建人源性抗AchR自身抗体哺乳类细胞表达的重组载体pIgG1-637。将pIgG1-637转染CHO-k1细胞,细胞培养上清液经斑点杂交试验检测抗体的表达,以放射免疫测定法测定表达的抗体与特异性人AchR结合的活性。结果细胞培养24h后能检测到抗体的分泌,表达的抗体能特异性地与抗原结合,且结合活性很高。结论已成功地构建了具有与抗原特异性结合的人源性IgG1类抗人AchR自身抗体IgG1-637。

关键词：乙酰胆碱受体重症肌无力自身抗体

电鳐乙酰胆碱受体诱导转基因小鼠重症肌无力的机制

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延边大学医学学报 2006年第4期29卷 235-237页

作者：金桂花李红花孟繁平李英信李芳芳孙昌元金权鑫 m.stassen m.deBaets 延边大学基础医学院免疫学与病原生物学教研部吉林延吉133000 荷兰马斯特里赫特大学医学院神经学系

[目的]探讨电鳐乙酰胆碱受体诱导人免疫球蛋白转基因小鼠实验性自身免疫性重症肌无力的机制．[方法]将电鳐电器官分离并纯化的乙酰胆碱受体作为免疫原，免疫人免疫球蛋白转基因小鼠，以放射免疫方法测定小鼠血清中抗乙酰胆碱受体抗体滴... 详细信息

[目的]探讨电鳐乙酰胆碱受体诱导人免疫球蛋白转基因小鼠实验性自身免疫性重症肌无力的机制．[方法]将电鳐电器官分离并纯化的乙酰胆碱受体作为免疫原，免疫人免疫球蛋白转基因小鼠，以放射免疫方法测定小鼠血清中抗乙酰胆碱受体抗体滴度，以免疫荧光技术观察小鼠骨骼肌中抗乙酰胆碱受体抗体的结合性．[结果]小鼠血清中的抗乙酰胆碱受体抗体滴度为155～539pmol，小鼠肌肉中具有人抗乙酰胆碱受体抗体．[结论]电鳐乙酰胆碱受体刺激人免疫球蛋白转基因小鼠产生的人抗乙酰胆碱受体抗体，可与肌肉组织中的乙酰胆碱受体结合，导致肌肉收缩无力，可诱导重症肌无力．

关键词：重症肌无力受体胆碱能小鼠转基因

Influence of cerium ions on structure-dependent magnetic properties of Ba-Sr m-type hexaferrite nanocrystals

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Journal of Rare Earths 2024年第2期42卷 364-372,I0005页

作者： Ram A.Pawar Sunil m.Patange P.m.Dighe Sher Singh meena Abdullah GAl-Sehemi mehboobali Pannipara Santosh S.Jadhav Department of Physics ArtsCommerce and Science CollegeAhmednagar413711MaharashtraIndia Department of Physics Shri Krishna MahavidyalayaGunjotiDistOsmanabad413606MaharashtraIndia Padmashri Vikhe Patil College of Arts Science and CommercePravaranagarA/P.Loni(Kd)Tal.RahataDistAhmednagar413713MaharashtraIndia Solid State Physics Division Bhabha Atomic Research CentreMumbai400085MaharashtraIndia Department of Chemistry King Khalid UniversityAbha61413Saudi Arabia Department of Physics D.S.M's ArtsCommerce and Science CollegeJintur431509MaharashtraIndia

The present study is a systematic effort to investigate the structure-sensitive magnetic parameters of Ce^(3+) substituted Ba-Sr hexaferrite nanocrystals chemically formulated as Ba_(0.5)Sr_(0.5)Ce_(x)Fe_(12-x)O_(19) where x=0.0-0.2 with Δx=*** hexaferrite powders were prepared using the sol-gel self-ignition route and structurally characterized by means of powder X-ray diffraction and Fourier transform infrared *** creation of the m-type hexaferrite phase within the synthesized samples was revealed from the Rietveld refinement of the X-ray *** occurrence of a secondary phase of CeO_(2) was revealed within the hexaferrites for the substitution,x> *** refined X-ray diffraction data were utilized to compute the lattice parameters,X-ray density,and lattice parameter *** crystal structure plotted from the refined XRD data reveals the occupancy of the ions at different lattice *** XPS data of the hexaferrite were analyzed to confirm the oxidation states of the constituent *** nanocrystalline nature of the hexaferrites was revealed from the crystallite sizes calculated using Scherer's *** analysis of FTIR spectra confirms that only a fraction of Ce^(3+)accommodated in the lattice and the remaining Ce content reside in the form of the CeO_(2) *** morphology of the hexaferrites was analyzed from the FESEm profiles of the ferrite *** magnetic behavior study was performed by analyzing the Curie temperature,hysteresis loops,and hyperfine interactions by means of susceptibility,V.S.m,and mossbauer spectroscopy,*** hexaferrites with increasing coercivity,decreasing saturation magnetization,and decreasing Curie temperature are reported in the *** substituted Ce^(3+)ions inhibit the grain growth and create lattice imperfections giving rise to hexaferrites with tuned magnetic parameters suitable for different applications.

关键词： Ba-Sr hexaferrite Ce^(3+)substitution XPS Saturation magnetization Coercivity m?ssbauer spectroscopy

Frequency-dependent viscoelasticity effects on the wave attenuation performance of multi-layered periodic foundations

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Applied mathematics and mechanics(English Edition) 2024年第3期45卷 407-424页

作者： m.SAFI m.VAKILIFARD m.J.mAHmOODI Faculty of Civil Water&Environmental EngineeringShahid Beheshti UniversityTehran ***Iran Faculty of mechanical and Energy Engineering Shahid Beheshti UniversityTehran ***Iran

In this paper,layered periodic foundations(LPFs)are numerically examined for their responses to longitudinal and transverse modes in the time and frequency *** different unit-cells,i.e.,2-layer,4-layer,and 6-layer unit-cells,comprising concrete/rubber,concrete/rubber/steel/rubber,and concrete/rubber/steel/rubber/lead/rubber materials,respectively,are taken into ***,the viscoelasticity behavior of the rubber is modeled with two factors,i.e.,a frequency-independent(FI)loss factor and a linear frequency-dependent(FD)loss *** the extraction of the complex dispersion curves and the identification of the band gaps(BGs),the simulations of wave transmission in the time and frequency domains are performed using the COmSOL *** parametric studies evaluate the effects of the rubber viscoelasticity models on the dispersion curves and the wave transmission for the longitudinal and transverse *** results show that considering the rubber viscoelasticity enhances the wave attenuation ***,the transverse-mode damping is more sensitive to the viscoelasticity model than its longitudinal *** 6-layer unit-cell LPF exhibits the lowest BG,ranging from 4.8 Hz to 6.5 Hz.

关键词： layered metamaterial periodic foundation complex dispersion curve wave transmission diagram

Engineering of efficient visible light photocatalysts:Ti_(1-x+y)Cu_(x)La_(y)O_(2)(x=0.03;y=0,0.005,0.01) compositions

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Journal of Rare Earths 2024年第3期42卷 497-505,I0003页

作者： S.m.Yakout A.m.Youssef Inorganic Chemistry Department National Research Centre(NRC)El Buhouth StDokkiCairo12622Egypt

In dye-photocatalysis, widening the wavelengths absorption range of catalysts as well as aborting the recombination of the photoexcited charge carriers(electrons-holes pairs) are of paramount *** the current study, we report the photocatalytic characteristics of four compositions composed of TiO_(2),Ti_(0.97)Cu_(0.03)O_(2), Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)powders for two harmful dyes(Congo red and methylene blue). The X-ray diffraction technique verified the configuration of mixed anatase and rutile phases in pure TiO_(2)and Ti_(0.97)Cu_(0.03)O_(2)powders while Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)powders possess anatase phase only. The changes of the band gap structure and dimensions of the unit cell volume of TiO_(2)confirm the substitution of Ti^(4+)sites by Cu^(2+)and La^(3+)ions. Remarkable widening of wavelengths absorption with formation of long absorption tails were found in TiO_(2)(3.13 e V) through insertion of La^(3+)plus Cu^(2+)ions. Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)samples exhibit a visible light band gap of 2.3 and 2.7 e V, respectively. Based on SEm images, incorporation of Cu^(2+)and La^(3+)ions influences the surface morphology of TiO_(2). The resulting Ti_(0.97)Cu_(0.03)O_(2), Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)powders present enhanced photocatalytic activity towards Congo red dye degradation compared to pure one under natural solar spectrum. The best Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)catalyst exhibits superior photocatalytic activity of 96% for 10 ppm CR dye in 20 min as well as above average photocatalytic efficiency of 63% for 30 ppm CR dye in 120 min. As well, it showed acceptable photodegradation activity of 52% for 30 ppm mB solution in 140 min of sunlight irradiation. The heightened photodegradation efficiency of Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)catalyst can be clarified in terms of higher ch

关键词： Semiconductor TiO_(2) Rare earths Congo red methylene blue Solar spectrum Photodegradation