小鼠胚胎玻璃化冷冻保存及保存时间对其体内外发育率的影响

本试验采用乙二醇为主体的ＥＦＳ４０玻璃化溶液,对小鼠扩张囊胚实行二步法玻璃化冷冻保存。结果保存１小时、１年和２年的胚胎,在体内外的发育率无显著性差异（Ｐ＞０．０５）。与对照组相比较也无显著性差异（Ｐ＞０．０５）。     

水稻白叶枯病菌鸡卵黄抗体的制备及其初步应用

 通过免疫产蛋母鸡制备了针对水稻白叶枯病菌菌株ZJ-173的卵黄抗体(IgY),比较了一种中草药佐剂和福氏佐剂对抗体产生和效价的影响。结果表明:与福氏佐剂相比,中草药佐剂对免疫母鸡的生活力和产蛋影响较小,母鸡恢复产蛋较早(免疫后7天)。卵黄中抗体出现后,两种佐剂处理的抗体都能在抗体出现后15天达到较高效价,并维持较高效价达2个月以上。卵黄抗体经PEG方法提纯后可得到比较纯净的IgY。提纯的IgY蛋白含量平均为11.843mg/ml,双扩散效价为1:128~512。将卵黄抗体IgY作为包被抗体用于异动物抗体双夹心ELISA可有效地检测水稻病叶病种上的白叶枯病菌,其检测灵敏度为10⁴cfu/ml。     

New host for raspberry bushy dwarf virus: arctic bramble (Rubus arcticus)

Raspberry bushy dwarf virus (RBDV) was detected in three new host plants inRubus species,i.e., arctic bramble (R. arcticus ssp.arcticus), Alaskan arctic bramble (R. arcticus ssp.stellatus) and their hybrid (R. arcticus L. nothosubsp.stellarcticus G. Larsson). The virus was identified as RBDV by the symptoms elicited in the test plantsChenopodium quinoa andC. amaranticolor, by sedimentation profile in sucrose density gradient, by RNA banding pattern in agarose gel electrophoresis, by protein analysis of the purified viruses in SDS-polyacrylamide gel electrophoresis, and by Western blotting. There was a high incidence of RBDV-infected plants in the experimental plots. The presence of the virus in arctic bramble did not always induce foliar symptoms. However, yellowing of the leaves around central and lateral veins was quite frequently observed, especially in spring and autumn.     

Preparation and identification of anti- angiostatin monoclonal antibodies

AIM:To further study the anti-tumor effect of angiostatin, an anti-human angiostatin monoclonal antibody was prepared and identified.METHODS:The hybrodoma techniques were used. The BALB/C mice were immunized with angiostatin. The supernatant of cell culture were collected and screened by ELISA and double immunodiffusion.RESULTS:There cell lines which steadily secreted the anti-angiostatin monoclonal antibody were identified by ELISA and double immunodiffusion. The antibody was IgG1 and specifically recognized angiostatin without crossing reactions to rhIL-2, rhTNF-α, rhIFN-α and serum proteins.CONCLUSION:The antibodies secreted by three hybridoma cell lines identified by several methods were specific antibodies of angiostatin.     

鸡新城疫-传染性支气管炎二联油乳剂灭活疫苗免疫抗体消长规律的测定

将40日龄非免疫鸡分为3组,每组20只。第1组：肌肉注射鸡新城疫一传染性支气管炎二联油乳剂灭活疫苗0．5mL／只,并在免疫后的不同时间检测ND抗体和IB抗体;第2组：第一次免疫后71d,用同一疫苗进行第二次免疫,并追踪测定ND抗体和IB抗体;第3组：不注射疫苗,试验对照组。用血凝抑制试验（HI）检测ND抗体,用间接ELISA检测IB抗体。结果表明,第1组试验鸡接种疫苗后在6d就可以产生ND抗体（4log2）,30d达到最高峰（10．11log2）,持续期为110d;在18d检测到IB的阳性抗体（S／P值〉10．2或滴度／〉396）,持续期为120d。第2组试验鸡的IB、ND抗体效价普遍高于第1组,抗体水平持续到228d时ND抗体效价达到6．2log2;IB抗体滴度达到4275。     

千里光抗菌有效部位化学成分及其急性毒性研究

用60％乙醇作溶剂制备千里先抗菌有效部位冻干粉（即千里光60％乙醇提取物）．分析其化学成分．并用改良寇氏法测定其对小鼠腹腔注射的急性半数致死量（LD50）。结果发现,千里光60％乙醇提取物合有生物碱、黄酮类化合物,但不含双稠吡咯啶生物碱;测得千里光60％乙醇提取物对小鼠腹腔注射的LD50为2206mg／kg,95％可信限为1867—2607mg／kg。表明千里光60％乙醇提取物属低毒性物质,并可保留千里光的有效成分生物碱和黄酮类化合物而排除其中的双稠吡略啶生物碱．进一步提高了千里光的安全性。     

河南省部分地区奶牛肉孢子虫感染的血清学调查

为了解河南省奶牛肉孢子虫病流行情况,2018年3月至2019年9月用间接酶联免疫吸附试验(ELISA)对采自河南省13个地区58个奶牛场的1 819份血样进行了肉孢子虫抗体检测分析.结果肉孢子虫抗体阳性牛场31个,场阳性率53.4％,阳性样品424份,样品平均阳性率为23.3％;不同生长阶段牛群阳性率差异极显著(P＜0...     

Phylogenetic and epidemiological characteristics of H9N2 avian influenza viruses in Shandong Province,China from 2019 to 2021

H9N2 avian influenza virus(AIV) has widely circulated in poultry worldwide and sporadic infections in humans and mammals. During our surveillance of chicken from 2019 to 2021 in Shandong Province, China, we isolated 11 H9N2AIVs. Phylogenetic analyses showed that the eight gene segments of the 11 isolates were closely related to several sublineages of Eurasian lineage: BJ/94-like clades(HA and NA genes), G1-like clades(PB2 and M genes), and SH/F/98-like clades(PB1, PA, NP and NS genes). The isola...     

小鼠对pGM-CSF/SS生长抑素基因疫苗的免疫应答

通过研究细胞因子GM-CSF与生长抑素pcS/2SS融合表达质粒pGM-CSF/SS诱导小鼠免疫应答的影响,探求生长抑素基因免疫新策略。将60只20日龄雄性昆明小白鼠均分为6组,分别用PBS(C0)、pGM-CSF质粒(C1)、pGM-CSF/SS质粒(T1、T2、T3)、pcS/2SS(T4)质粒口服免疫,T1~T4组的免疫剂量分别为2×106cfu/mL、2×108cfu/mL、2×1010cfu/mL、2×108cfu/mL,以上质粒均以减毒沙门氏菌为传导载体。结果显示:pGM-CSF/SS组的抗生长抑素抗体AP/AN值显著高于pcS/2SS组,阳性鼠体增重亦高于pcS/2SS组,抗体阳性率分别是71.4%和40.0%。另外,高剂量组的AP/AN值极显著高于低剂量组,显著高于中剂量组;中剂量组的AP/AN值显著高于低剂量组,高剂量组的抗体阳性率也明显高于中剂量组和低剂量组,分别为100%、71.4%和20.0%。可见,pGM-CSF/SS疫苗的免疫效果优于pcS/2SS疫苗,且pGM-CSF/SS疫苗呈剂量依赖关系。这些结果显示出细胞因子GM-CSF可以增强生长抑素DNA疫苗的免疫效果。     

轮状病毒VP4基因的原核表达、蛋白纯化及动物免疫试验

在大肠埃希菌中表达并纯化了轮状病毒SA11株的外壳蛋白VP4,并测定了该纯化产物免疫豚鼠后的中和抗体滴度。结果表明,轮状病毒VP4主要以包涵体的形式存在,利用阴离子交换层析纯化后,VP4纯度为80%,与弗氏佐剂混合接种豚鼠后,所产生的中和抗体效价为1∶500。