Arabinogalactan proteins may facilitate the movement of pollen tubes from the stigma to the ovules in Actinidia deliciosa and Amaranthus hypochondriacus

Sexual plant reproduction is a complex process that involves a series of interactions between the male gametophyte and the different cell types of the pistil. These interactions are believed to direct the pollen tube growth until its final target, the embryo sac. Arabinogalactan proteins are complex proteoglycans that are believed to be involved in these processes. The pistil is enriched in these highly glycosylated proteins and we provide results that show the selective presence of different AGP epitopes at the surface of the cells or in the ECM of the tissues that correspond exactly to the pollen tube growth pathway in Amaranthus hypochondriacus and Actinidia deliciosa. We also show that in Actinidia deliciosa, which is a dioecious plant with the male flowers having rudimentary ovaries where fertilization does not occur, there is no presence at all of the epitopes recognised by the monoclonal antibodies utilized in this study. This revised version was published online in July 2006 with corrections to the Cover Date.     

斑点金标免疫渗滤法诊断家畜血吸虫病的敏感性和特异性

研制成家畜血吸虫病斑点金标免疫渗滤法（DIGFA）诊断试剂盒可测出人工感染血吸虫14—42d的病牛、猪和兔的血清及血纸抗体，比病原体检查法提早28d查出病畜，达到早期诊断的要求；同时亦能检出仅感染1对血吸虫病牛抗体，证实DIGFA具有较高的敏感性。血吸虫与肝片吸虫、锥虫、蛔虫、囊虫和旋毛虫病之间未见交叉反应现象，说明本法具有较强的特异性。     

水稻白叶枯病菌单克隆抗体酶联试剂盒的研制及其应用

利用全菌包被酶联免疫吸附试验间接法,建立了能准确快速灵敏测定不同类型的水稻白叶枯病菌的单抗酶联试剂盒。应用该试剂盒检测水稻白叶枯病病叶样品101份、病种样品10份及水稻白叶枯病病菌65个菌株,结果均为阳性,且重复性好,该试剂盒使用简便、灵敏度高、特异性强,有实用价值。     

抗猪瘟病毒单克隆抗体的研究——Ⅱ抗猪瘟兔化弱毒单克隆抗体杂交瘤细胞株的建立

用聚乙二醇沉淀浓缩纯化猪瘟兔化弱毒中国株(SFV-C)免疫 BALB/C 小鼠,取其脾脏,制备淋巴细胞,与 FO 骨髓瘤细胞融合,经 EliSA 检测和有限稀释法克隆化,最后筛选出5株对SFV 的单克隆抗体杂交瘤细胞.所制成的腹水抗体,一株只对 SFV-C 发生特异性反应,四株与SFV-S,SFV-F 及 BVDV oregon 发生微弱的交叉反应.细胞上清液的 EliSA 效价为1:800～1600,腹水效价为1:10~6～10~7.     

Production and Identification of High Affinity Monoclonal Antibodies Against Pesticide Carbofuran

To produce high-affinity monoclonal antibodies against pesticide carbofuran, and the develop immunochemical assays for people＇s health and environmental protection, the hapten 4-[[（2,3-dihydro-2,2-dimethyl-7-benzofuranyloxy） carbonyl]- amino]-butanoic acid （BFNB） of carbofuran was synthesized and Balb/c mice were immunized by the hapten-carrier （BFNB-bovine serum albumin, BFNB-BSA） conjugates. The splenocytes of immunized mice were fused with Sp2/0 cells and the cultural supernatants of hybridoma cells were screened by the indirect enzyme-linked immunoabsorbent assay （ELISA）, based on BFNB-ovoalbumin conjugates （BFNB-OVA）. Purified monoclonal antibody （McAb） was obtained from fluids of ascites, deposited by octanoic acid and ammonium sulfate. The affinity and the specificity of McAb were characterized by ELISA or indirect competitive ELISA. A hybridoma cell line （5D3） secreting anti-carbofuran McAb had been established. The titer of culture medium and ascites was up to 1：2.048 × 10^3 and 1：1.024 × 10^6, respectively, and the subtype of the McAb was IgG1. The affinity constant of the McAb was about 2.54 × 10×9 L mol^-1, with an IC50 value of 1.18 ng mL^-1 and a detection limit of 0.01 ng mL^-1. Cross-reactivity studies showed that the McAb was quiet specific for carbofuran, as among the four analogous compounds, they were all hardly recognized （4.59 × 10^-4% for 2,3-dihydro-2,2- dimethyl-7-benzofuranol and less than 3.0 × 10^4% for others）. The prepared McAb had a very high affinity and specificity, and it could be used to develop ELISA for rapid determination of carbofuran.     

抗沙门氏菌O_4、O_(12)抗原特异单克隆抗体的产生及其特性鉴定

用鼠伤寒沙门氏菌的热灭活全菌和热酚—水抽提脂多糖抗原免疫BALB/c小鼠,取脾脏淋巴细胞与SP_2/O细胞融合,获得稳定分泌抗沙门氏菌O_4和O_(12)抗原的特异单克隆抗体的杂交瘤细胞系7个,分别命名为AG24-1、AG90-5、BG1-8、BG17-12、BG66-10、BG78-15、EG19-11。小鼠腹水中的单抗直接凝集滴度为10~2-10~4,间接免疫荧光滴度为10~3-10~6。与沙门氏菌和肠杆菌科中其他细菌的反应性试验表明,BG78-15是O_(12)因子特异单抗,其他6种为对O_4因子的特异单抗。     

猫瘟热病毒胶体金快速检测试纸的研究

利用双抗体夹心和胶体金免疫层析技术的原理,在玻璃纤维膜、硝酸纤维膜的检测线(T)和对照线(C)上分别喷上胶体金与猫瘟热病毒(FPV)单克隆抗体(3C4)的偶联物、FPV多克隆抗体和羊抗鼠IgG单克隆抗体,制成检测FPV抗原的猫瘟热病毒胶体金快速检测试纸,对临床26份虎粪便样本进行检测,并与PCR检测法及韩国(ASAN ...     

新城疫病毒感染绵羊诱导免疫应答反应的实验研究

为探索新城疫病毒(NDV)作为羊病毒病疫苗载体的可行性,验证NDV感染绵羊的可能性,本研究采用NDV Clone-30株分别通过滴鼻和气管灌注两种途径接种绵羊,接种后观察临床症状,检测接种动物排毒情况,通过血凝抑制试验检测接种绵羊特异性血凝抑制抗体,ELISA试验检测接种绵羊血清特异性IgG抗体,微量中和试验检测接种绵羊血清中和抗体.研究结果表明,NDV在绵羊体内是非致病性的,并且通过两种接种途径在绵羊体内均可以产生血凝抑制抗体、NDV特异性IgG抗体和中和抗体反应.本研究结果表明NDV有可能作为宿主限制性疫苗载体用于预防无特效疫苗的羊类疾病,且与气管灌注接种途径比,滴鼻接种途径相对安全.