斜纹夜蛾核型多角体病毒多角体蛋白和病毒粒子的血清学研究

斜纹夜蛾核型多角体病毒多角体蛋白的抗血清与其同源抗原,在双向免疫扩散和免疫电泳中产生一条沉淀线和一条沉淀弧,病毒粒子的抗血清与其同源抗原,在双向免疫扩散和免疫电泳中形成两条沉淀线和三条沉淀弧。异源系统之间无交叉反应。凝胶内吸收试验表明多角体蛋白与病毒粒子之间不存在共同抗原,两种组分无血清学关系。     

从对流免疫扩散电泳免疫复合物沉淀线提取抗原小核RNA的方法

可提取性核抗原(ENA,包括Sm、RNP、Ro和La等多种抗原成分)是小核RNA和蛋白质组成的复合物。本文介绍从对流免疫扩散电泳(CIDE)形成的免疫复合物沉淀线提取单一抗原小核RNA的方法。其结果与纯化抗原的小核RNA组成相同。此法仅需约100微升的单价特异性抗体,抗原不需纯化,操作简单易行。     

山蚂蝗植物的免疫双扩散研究

以豆科山蚂蝗类(传统的山蚂蝗属)植物中的长柄山蚂蝗属的两种代表植物尖叶长柄山蚂蝗(Podocarpium oxyphyllum)和长柄山蚂蝗(P．podocarpum)；山蚂蝗属的两种代表种波叶山蚂蝗(Desmodium sinuatum)和大叶拿身草(D．1axifiorum)等4种植物的种子为材料，提取分离其球蛋白组份作为抗原，免疫家兔得到相应的抗血清。在免疫实验中，反应抗原增加了山蚂蝗属的总状山蚂蝗(D．spicatum)、圆锥山蚂蝗(D．esquirdii)和小槐花(D．caudatum)3种，通过免疫双扩散，研究了山蚂蝗植物7个种的部分血清学行为以及他们之间的相互关系。其结果为尖叶长柄山蚂蝗和长柄山蚂蝗具有相似的血清学特性，支持了形态学将广义的山蚂蝗属分成山蚂蝗属和长柄山蚂蝗属的分类学结论。     

Detection of Grass Carp Hemorrhage Virus （GCHV） from Vietnam and Comparison with GCHV Strain from China

Grass carp plays an important role in small-scale aquaculture in Vietnam. However, a severe disease, known in Vietnam as “Red Spot Disease“, is causing significant economic loss in grass carp aquaculture. In this study, the tissue samples isolated from the grass carp with Red Spot Disease in Vietnam are investigated and eomparied with the control GCHV isolated in China by experimental infection, culture cell infection, serological cross reactivity, and RT-PCR amplifica-tion. Infected grass carp exhibits hemorrhage symptoms about 5 days after experimental injection with GCHV-V (Vietnam) strain. The symptoms and lethality induced by the GCHV-V strain are identical to that induced by the Chinese GCHV-9014 strain. The Chinese GCHV-873 strain in-duces typical cytopathogenic effects in 4 cell lines, such as CIK, CAB, FHM and GCO, from the6 fish cell lines examined. No cytopathogenic effects are observed in all the 6 examined cell lines,including CAB, FHM, CIK, EPC, CCO and G(X), infected by the GCHV-V strain and GCHV-9014 strain. Immunodiffusion assays demonstrate an obvious cross-reactivity among three GCHVstrains. Precipitin lines are clearly observed not only between the anti-GCHV-873 serum and thetwo strains GCHV-873 and GCHV-9014, but also between the anti-GCHV-873 serum and the GCHV-V strain. GCHV can be detected by immunodiffusion assays after three generations of blind propagations in the cell lines inoculated by GCHV-V strain. This implicates that GCHV-Vviruses have been replicated and amplified despite there being no cytopathogenic eifects observed in these examined cell lines. Three genome segments of GCHV, including S8, S9 and S10, are amplified by three sets of PCR primers designed according to the segment sequences published re-cently. The Q8fp and Q8rp primer set specific for genome segment S8 amplifies a 955 bp frag-ment from the extracted sample of diseased fish with Red Spot Disease, and the fragment size is i-dentical to that amplified by the same primer set from control GCHV-873 strain. Simultaneously,the Q9fp and Q9rp primer set specific for genome segment S9 generates a same 635 bp product,and the Q10fp and Q10rp primer set specific for genome segment S10 produces a same 697 bp fragment from both template samples of diseased fish with Red Spot Disease and control GCHV-873 strain. The RT-PCR amplification and corresponding size comparison data indicate that the three GCHV-V genome segments extracted from the diseased grass carp with Red Spot Disease in Vietnam should be identical to that in control GCHV-873 strain from China. The data confirm that the causative agent of grass carp Red Spot Disease in Vietnam is a virus, and the virus is closely similar to GCHV strain in China.     

Biochemical and immunochemical evidence for the origin of the spermatophore material inGlossina morsitans morsitans Westwood

Summary Protein patterns in secretions from fully differentiated male accessory reproductive glands (ARG), spermatophore (Sp) and testes (Te) of the tsetse,Glossina morsitans morsitans Westwood, were determined by isoelectrofocusing. Isoelectrofocusing patterns of total ARG proteins and those of Sp were remarkably similar. At least 27 bands were detected in ARG and Sp. Out of these, 13 were major protein bands and isoelectrofocused in the pl range of 4 and 6.55. About 10 of these 13 were found to be acidic. Ouchterlony immunodiffusion and straight line immunoelectrophoresis showed that male accessory reproductive gland secretory proteins and spermatophore share common immunological characteristics which are different from those of the testes.