小儿内脏器官的形态学研究(五)——新生儿盲肠和阑尾的形态观察

测量30例新生儿盲肠和阑尾的形态和位置。回盲口的形状多数(80.00±7.30％)呈不规则形。阑尾根部体表投影在脐水平线下方1.51±8.95mm和腹股沟韧带中点垂线外侧1.26±10.90mm处。     

固尔苏治疗NRDS前后血管内皮分泌功能的改变

目的 :研究肺表面活性物质 (PS)治疗新生儿呼吸窘迫综合征 (NRDS)前后血管内皮分泌功能变化及可能的治疗机理。方法 :用PS制剂固尔苏治疗 18例NRDS患儿 ,于治疗前 3 0min ,治疗后 1、 6、 12、 2 4h ,用硝酸还原酶法测定NO (一氧化氮 )、放射免疫法测定ET (内皮素 )、 6 K PGF1α (6 酮前列环素 )。结果 :固尔苏治疗后患儿NO、 6 K PGF1α明显升高 ,ET明显下降 ,与治疗前比较有显著性差异 (P <0 0 1)。治疗后 1、 6、 12、 2 4hNO、6 k PGF1α、ET各组间两两比较无明显差异 (P >0 0 5 )。结论 :PS治疗NRDS的机理可能是通过改善血管内皮功能发挥作用 ,为用外源性NO吸入和静注前列环素辅助治疗NRDS提供可能的实验依据。     

Identification of Babesia bigemina infected erythrocyte surface antigens containing epitopes conserved among strains

The presence of previously uncharacterized antigens (new antigens) on the surface of intact erythrocytes infected with three strains of Babesia bigemina from Kenya and one each from Puerto Rico, Mexico, St. Croix, and Texcoco-Mexico was demonstrated by indirect immunofluorescent antibody (IFA) reactions. These antigens were not strain specific because antibodies in bovine immune serum to either the Mexico or Kenya isolates reacted with all seven strains tested. Homologous and heterologous immune serum antibodies bound a maximum of 83% and 55%, respectively, of intact erythrocytes infected with the Kenya-Ngong strain but not uninfected erythrocytes. Both sera caused agglutination of only infected erythrocytes. Antibodies eluted from the surface of glutaraldehyde (0.25%) fixed infected erythrocytes had IFA reaction patterns among strains similar to those of immune sera before elation. Eluted antibodies were used to determine if these antigens were protein and encoded by B. bigemina. Eluted antibodies bound seven parasite-encoded proteins of 240, 220, 66, 62, 58, 52 and 38 kDa in an erythrocyte surfacespecific immunoprecipitation reaction of ³⁵-methionine labelled proteins. It was concluded that the surface of B. bigemina infected erythrocytes had parasite-encoded proteins and that these proteins had surface exposed epitopes that were conserved among the seven strains examined which were from two continents.     

血清前－S_2蛋白检测的临床意义

采用ＥＬＩＳＡ法检测１０４例各类型乙型肝炎（乙肝）患者的血清前－Ｓ２抗原（Ｐｒｅ－Ｓ２Ａｇ）及其抗体（Ｐｒｅ－Ｓ２Ａｂ），结果表明，Ｐｒｅ－Ｓ２Ａｇ的出现与ＨＢｓＡｇ、ＨＢｅＡｇ、ＨＢｃＡｂ呈显著相关性（Ｐ值均＜０．００５），主要见于乙肝急性期及慢性乙肝患者，说明病毒复制活跃、传染性强。而Ｐｒｅ－Ｓ２Ａｂ阳性仅见于急性乙肝恢复期。     

乙型肝炎病毒表面抗原单链抗体细胞内免疫抗乙型肝炎病毒基因治疗研究

目的 :研究乙型肝炎病毒表面抗原 (HBsAg)人源单链可变区抗体 (ScFv)细胞内免疫抗乙型肝炎病毒(HBV)基因治疗的作用。方法 :用噬菌体表面展示技术筛选特异性的HBsAg人源单链可变区抗体 ,聚合酶链反应(PCR)法扩增HBsAg单链抗体基因 ,并构建表达HBsAgScFv基因的重组逆转录病毒载体pLXSN HBsAgScFv,转染PA317细胞 ,将转染细胞分泌的假病毒颗粒感染 2 2 15细胞 ,酶联免疫吸附法 (ELISA)检测其上清HBsAg和HBeAg ,定量检测HBVDNA。结果 :成功筛选出HBsAgScFv ,PCR扩增出 75 0bp的全基因 ,构建HBsAgScFv基因的逆转录病毒载体 ,转染PA317细胞 ,在上清中检测出含HBsAgScFv假病毒颗粒的存在 ,上清感染 2 2 15细胞后第 3、5、7、14天 ,HBsAg、HBeAg逐渐下降 ,到第 14天时HBsAg已变为阴性 ,DNA定量检测无明显变化。结论 :HBsAgScFv能成功地在逆转录病毒载体中表达 ,并有抑制HBsAg、HBeAg表达的作用     

聚乳酸骨固定材料的研究

用聚乙烯醇(PVA)的二甲基亚砜(DMSO)溶液对水热反应法合成的超细羟基磷灰石(HAP)进行表面改性，用溶液分散复合法分别制备了HAP含量均为0．03g／mE的聚乳酸(PLLA)／HAP和PLIA／HAP-PVA复合物，并经过挤出成型得到φ=5mm的棒材。重点研究了热拉伸取向的拉伸规律及表面改性前后HAP粒子在PLLA基质中的分散情况。结果表明，经PVA改性的HAP粒子在PLLA基质中的分散要明显优于未经改性的HAP粒子。拉伸取向后PLLA／HAP-PVA复合材料的弯曲强度达262MPa。     

Application of an immunosensor for the detection of the β-lactam antibiotic, cephalexin

Public concern surrounding antibiotic contamination in food and food products has made it imperative to develop analytical methods for their detection. Polyclonal antibodies were used in the development of a surface plasmon resonance (SPR)-based inhibition immunoassay for cephalexin. A conjugate consisting of cephalexin-bovine serum albumin (BSA) was immobilized on the dextran gel surface of the sensor chip. Binding/regeneration studies of antibody to immobilized cephalexin were studied and dissociation of the antibody from the immobilized cephalexin was easily achieved with 10 mmol l^-1 NaOH. Forty surface regeneration cycles were carried out and found to be reproducible with only a 7.4% decrease in binding over this number of regenerations. Model inhibition immunoassays for cephalexin were developed in PBS and spiked milk samples with detection ranges of 4.88 to 2,500 ng ml^-1 and 244 to 3,906 pg ml^-1, respectively.     

体表电位标测微机系统(Ⅰ型)

本系统的107个电极中,103个分布于胸、背部,1个为参考电极,1个为V_3,其余用于肢导。本系统除能绘出2、4、8ms任意间隔的103通道同步的体表等电位图,常规12导联和V_(7 9)心电图,胸、背部位的心电图外,还可记录R峰值等电位图,∑R,Q波等电位图,nQ30、40,极大、极小轨迹图等。     

人抗HBsAg噬菌体抗体Fab段基因的序列分析及表达

对已建的噬菌体抗体库分离出来的人抗－ＨＢｓ克隆进行了序列分析和表达研究，发现４个克隆中３个克隆的重链和轻链完全相同，ＤＮＡ序列分析表明ＶＨ分别属于ＶＨ１亚群和Ⅱ亚群，其轻链ＶＬ分别属于ＶλⅡ亚群和ＶλⅠ亚群。构建了可溶性Ｆａｂ段表达载体，显示出在细菌中表达的Ｆａｂ段抗体与ＨＢｓＡｇ特异性结合，这说明所筛选出来的噬菌体抗体具有ＨＢdisplay status