Damage Action of Alkali-resistant Glass Fiber in Cement-based Material

The compressive strength and flexural strength with the same strength class cement mortar of the alkali-resistant glass fiber cement mortar were tested in standard and hot-water curing condition, and the damage mechanism of alkali-resistant glass fiber was studied. The interaction mechanisms of the chemical erosion and physical injury in different curing conditions were studied in order to summarize the damage mechanism of alkali-resistant glass fiber in cement-based materials, and chloride diffusivity coefficient and porosity of cement mortar were tested in the different curing conditions. The experimental results are that the strength of cement based materials and fiber cement slurry interface zone were closely related, and heat curing could accelerate the hydration of cement, but inevitably enlarge the defect.

Isolation and Identification of Alkali-Resistant 1,3-Propanediol Producing Strain

1,3-Propanediol is a promising renewable resource produced by microbial production. It is mainly used in many synthetic reactions, particularly applied to the polymer synthesis and cosmetics industry. We described here the isolation of strain ZH-1, which has the ability of high production with 1,3-propanediol, from Fenhe River in China. It was classified as a member of K. pneumoniae after the study of phenotypic, physio-logical, biochemical and phylogenetic (16S rDNA). The initial glycerol concentration, fermentation time and pH value of strain ZH-1 were determined to be 50 g·L-1, 36 h and 8.0. Under these conditions, the practical yield of 1,3-PD was 18.53 g·L-1 and a molar yield (mol1,3-PD molGlycerol-1 of 1,3-propanediol to glycerol of 0.497. In addition, we found that for the strain ZH-1, the optimum grown pH was 9.0, so we can deter-mine that it is a new member of alkali-resistant strains.

抗重组人组织因子途径抑制物1单抗抑制rhTFPI-1的抗凝作用

目的研制抗重组人组织因子途径抑制物1单克隆抗体(rhTFPI-1 M cAb),了解其对rhTFPI-1抗凝活性的抑制作用。方法将分泌rhTFPI-1 M cAb的杂交瘤细胞注入经降植烷预处理的Balb/C小鼠腹腔中,诱生腹水。腹水先经硫酸铵沉淀处理,再用rprote in A亲和层析柱进一步纯化。对纯化后的单克隆抗体进行SDS-PAGE检测和W estern b lot分析。并用发色底物法测定rhTFPI-1 M cAb对rhTFPI-1的活性抑制。结果纯化后的抗rhTFPI-1 M cAb经SDS-PAGE检测,其纯度为98%;W estern b lot分析显示其能特异识别rhTFPI-1抗原。发色底物法检测结果表明,其能有效阻断rhTFPI-1的抗FVIIa/TF活性,M cAb浓度为8 mg/L时FVIIa/TF剩余活性达到86%;但对rhTFPI-1的抗FXa活性作用不明显,M cAb浓度为80 mg/L时FXa的剩余活性为48.4%。结论rhTFPI-1 M cAb可明显抑制rhT-FPI-1活性,阻碍rhTFPI-1对TF/FVIIa的抑制活性。纯化后的rhTFPI-1 M cAb的各项鉴定指标均较为理想,rprote inA亲和层析柱纯化方法简便易行值得推广。

重组蛋白A亲和填料的制备及其性能评价

为了获得一种优良的抗体纯化介质,制备了重组金黄色葡萄球菌蛋白A(rProtein A)亲和填料,并考察了所制备的亲和填料的纯化性能。利用自行构建的rProtein A工程菌,经诱导表达、纯化获得rProtein A纯品,将其偶联到经环氧氯丙烷活化的Sepharose 4 Fast Flow凝胶上,得到rProtein A亲和填料,并使用兔抗尿酸氧化酶抗体对该填料的性能进行验证。结果显示,在自制的rProtein A亲和填料上rProtein A浓度为1.5×10-4 mol/L。采用Scatchard模型分析,得到其解离常数和最大表观吸附量分别为2.28×10-7 mol/L和20.697 g/L,说明制得的rProtein A亲和填料对抗体有很好的结合能力。将该填料于0.1 mol/L NaOH溶液中浸泡1 h,其色谱性能未见变化。将该填料用于纯化兔抗体,湿胶结合抗体量可达19 mg/mL;一步柱色谱即可得到电泳纯度的抗体样品,回收率高于96%。本研究为rProtein A亲和填料的国产化奠定了基础。

抗甲肝病毒基因工程单抗分离纯化与鉴定(英文)

为克服血源免疫球蛋白制品的不足 ,开发了抗甲肝病毒基因工程单克隆抗体anti_HAVIgG。用无血清培养基培养rCHO工程细胞株 ,上清液经过rProteinASFF亲和层析→脱盐→离子交换层析→超滤换液纯化后 ,所得anti_HAVIgG纯度达 99%以上 ,比活性约 10 0IU mg ,anti_HAVIgG活性回收率 40 %。所纯化的anti_HAVIgG分子量150kD ,等电点 8 4～ 9 3。免疫印迹实验证实anti_HAVIgG为人源全抗体分子。亲和层析介质rProteinASFF确实存在亲和配基脱落问题 ,但通过后续纯化步骤可有效除去。在亲和层析过程中加入高盐清洗步骤 ,可有效降低宿主DNA残留量水平。对样品中自由巯基含量进行了测定 ,认为非还原电泳图谱中低分子量条带是由于抗体分子内存在自由巯基引起。

基于间接ELISA的鲤血清CyHV-3 pORF65抗体检测方法的建立

鲤疱疹病毒3型(cyprinid herpesvirus 3,Cy HV-3)囊膜蛋白ORF65基因全长1 785 bp,编码594个氨基酸。该研究在稀有密码子分析及信号肽与跨膜结构预测的基础上,将p ORF65中的N端信号肽与C端跨膜区段删除后进行密码子优化与基因合成,将合成的截短ORF65(truncated ORF65)插入p ET32a(+)载体,构建了p ET32a-trun ORF65;进一步采用DNAstar、ABCpred、Bepi Pred 1.0软件预测了p ORF65的5个B细胞表位优势区段,以合成的截短ORF65为模板,通过SOE-PCR将5个B细胞表位优势区段编码序列融合后插入p ET32a(+)载体,构建了p ET32a-mod ORF65。重组质粒分别转入BL21(DE3)菌株,经IPTG诱导,SDS-PAGE和Western-blot分析,p ET32a-mod ORF65获得高效表达,表达的融合蛋白分子量为56.4 k D。此外,利用r Protein G亲和层析纯化了锦鲤(Cyprinus carpio haematopterus)血清Ig M,免疫小鼠,制备了鼠抗锦鲤Ig M多克隆抗体。在上述研究的基础上,将纯化的p ORF65作为包被抗原,鼠抗锦鲤Ig M多克隆抗体作为检测抗体,建立了间接ELISA方法,该方法可以检测p EGFP-ORF65 DNA疫苗免疫锦鲤后产生的特异性抗体。

KINETIC FACTORS AFFECTING THE CORROSION OF SiO_2 IN SILICATE GLASSES CAUSED BY ALKALINE SOLUTIONS

The corrosion of a ZrO2 containing alkali re-sistant silicate glass, float glass and silica glass caused by the aqueous solution of NaOH was studied by use of correlation method with spectrophotometry. Effects of the corroding tem-perature, time and solution concentration on the rate of reac-tion and the degree of corrosion were investigated; effects of the apparent activation energy and the experimental value of frequency factor on the rate constant were discussed.

PRAS40(Ser183)磷酸化多克隆抗体的制备及检测

PRAS40为富含脯氨酸、分子量为40kD的Akt底物蛋白,能够与雷怕霉素哺乳动物细胞靶点复合物1(mTORC1)结合,其苏氨酸183位点(Ser183)可被mTORC1磷酸化。为了制备PRAS40(Ser183)磷酸化多克隆抗体,本实验通过蛋白疏水性抗原性分析设计多肽抗原,用其免疫家兔获得抗血清,ELISA检测其效价为1:10000;Western blotting法检测发现,通过rProtein A Sepharose亲和层析纯化并经非磷酸化的抗原条吸附处理后的抗体可以明显提高磷酸化抗体的特异性;用PRAS40抗体及PRAS40(Ser183)磷酸化抗体对正常细胞HL7702、HEK293及肿瘤细胞HepG2、A549、S180的检测显示:磷酸化的Ser183在不同细胞中表达差异不显著,而在经细胞饥饿处理的HEK293细胞中却明显观察到了S183磷酸化水平随氨基酸含量降低而减弱的现象。因此,本实验所制备的抗体可用于PRAS40(Ser183)磷酸化位点的功能研究。

新型耐碱蛋白A介质的制备与性能

以蛋白A结构中耐碱性更好的C区为基础,构建一种新型耐碱蛋白A,并偶联至琼脂糖基质,获得新型耐碱蛋白A亲和层析介质,分别用激光共聚焦显微镜和石英晶体微天平研究了人免疫球蛋白(h Ig G)与蛋白A介质的结合过程。结果表明,该介质具有较商品配基更高的结合力和稳定的再生性能,hIgG动态载量达62.0 mg/mL,40次再生操作后载量为初始载量的84%。该介质在抗体纯化领域具有较好的应用前景。