Interferon gamma responses to proteome-determined specific recombinant proteins: Potential as diagnostic markers for ovine Johne's disease

Johne's disease (JD), or paratuberculosis is a fatal enteritis of animals caused by infection with Mycobacterium avium subspecies paratuberculosis (Map). There may be a long subclinical phase with no signs of clinical disease.     

马绒毛膜促性腺激素单克隆抗体的制备及鉴定

本研究采用马绒毛膜促性腺激素(equine chorionic gonadotropin,eCG)纯品免疫BALB/c小鼠,取其脾细胞与同系小鼠骨髓瘤细胞SP2/0按1∶10融合,间接酶联免疫吸附法(ELISA)筛选阳性克隆和有限稀释法克隆,扩大培养后于小鼠腹腔制备腹水,共得到8株能稳定分泌单克隆抗体的杂交瘤细胞株,采用间接ELISA测定抗体效价,效价均达10^-5以上。用获得的杂交瘤细胞株制备单克隆抗体,为eCG分泌水平的ELISA检测方法的建立确立了条件。     

钝叶草叶斑病病原鉴定

为鉴定钝叶草叶斑病的病原,通过对61份来自中国海南、广东、广西、云南、福建、江苏,以及美国和南非的疑似钝叶草叶斑病的叶片样品进行分离培养,获得120个菌株,对其进行纯化培养、形态学观察、致病性测定,利用来自海南的钝叶草为靶标寄主,并利用rDNA-ITS、GAPDH、TUB2引物对55号菌株进行分析鉴定.结果表明,经柯赫...     

O、A、Asia1型口蹄疫病毒胶体金定量检测免疫层析方法的建立

旨在建立口蹄疫病毒(foot-and-mouth disease virus,FMDV)抗原血清型的快速分型和定量的检测方法,利用双抗体夹心法,将口蹄疫病毒的兔抗及豚鼠抗体作为标记胶体金与NC膜检测带的原料,分别制备出检测O、A、Asia 1血清型的3种层析试纸卡.通过对标定的抗原标准品146S检测,拟合出定量标准曲线...     

测鸭出血症病毒间接免疫荧光试验的建立

为寻求一种检测鸭出血症病毒 (duck hemorrhagic disease virus,DHDV)快速、敏感、实用的方法 ,建立了间接免疫荧光试验 ,并测定了一抗 (兔抗鸭出血症病毒阳性血清 )、二抗 (FITC标记的羊抗兔 Ig G)的最佳使用浓度及最佳感作时间分别为 1∶ 2 0、6 0 m in和 1∶ 10 0、6 0 min。以建立的间接免疫荧光试验检测了 DHDV于番鸭胚成纤维细胞中的复制动态 ,结果表明 ,接毒后 36～ 6 0 h为 DHDV大量复制期 ;6 0～ 12 0 h为 DHDV从核膜以出芽方式进入胞浆中成熟的阶段 ;12 0～ 14 4 h为大量 DHDV自胞浆中释放至胞外阶段。该方法快速、特异 ,可用于该病的实验室诊断。     

Influence of endotoxin induced fever on the pharmacokinetics of intramuscularly administered cefepime in rabbits

This study examined the effect of experimentally induced fever on the pharmacokinetics of cefepime (75 mg/kg BW) administered intramuscularly to six rabbits. The study was carried out in two consecutive phases separated by a two-week washout period. An infection was induced by an intravenous inoculation of 5 × 10⁸ colony-forming units of Escherichia coli 24 h before the pharmacokinetic investigation. A quantitative microbiological assay was employed to measure the plasma cefepime concentrations using an agar-gel diffusion method with Bacillus subtilis ATCC 6633 as the test organism. Twenty-four hour after the injection, the rectal temperature in the infected animals increased by 1–. There was a significant reduction in the elimination half-life by 21.8% in the febrile rabbits compared to healthy animals. In addition, the infection significantly increased the peak plasma concentrations by 11.9%, the mean residence time by 19.9%, the area under the plasma-concentration-time curve by 53.6% and the area under the moment curve by 62.3%. In conclusion, the endotoxin-induced febrile state produced significant changes in the plasma levels as well as some of the pharmacokinetic variables of cefepime in rabbits.     

四川盆地部分地区土壤中苏云金芽胞杆菌分离与cry基因鉴定*

［目的］ 对四川盆地土壤中Bt资源进行研究,了解其分布特点,为我国苏云金芽胞杆菌的储备奠定基础。［方法］ 从四川盆地5个地区采集土样,分离苏云金芽胞杆菌野生菌株。利用PCR RFLP及SDS PAGE方法对Bt分离株进行基因型鉴定和蛋白分析,并对其室内杀虫活性进行初步测定。［结果］ 从207份土样中获得26株苏云金芽胞杆菌野生菌株,出菌率为12.56%。油镜观察可看到球形、方形、菱形及不规则形的伴胞晶体。在21株Bt分离株中检测到cry1、cry1I、cry2、cry9四类基因,且多数菌株都是同时含有多个基因类型,有5株Bt分离株未发现已知基因;SDS-PAGE显示有9株菌株只表达了130 ku的蛋白, 2株只表达了124 ku的蛋白,2株只表达了45 ku的蛋白,6株同时表达了130 ku和60 ku的蛋白, 4株同时表达了124 ku和60 ku的蛋白, 2株同时表达了135 ku和60 ku的蛋白, 1株同时表达了130、90 ku及75 ku的蛋白。毒力测定结果表明：9株菌株对小菜蛾具有高毒力,2株对大猿叶虫有一定的杀虫活性。［结论］四川盆地土壤中Bt资源多样性丰富,其中有2株有一定的研究前景。     

卡氏肺孢子虫PCR检测方法研究进展

卡氏肺孢子虫主要引起动物和人的卡氏肺子虫肺炎，本文就PCR检测方法在检测卡氏肺孢子虫中的应用方面进行了综述。     

Comparative molluscicidal action of extract of Ginko biloba sarcotesta, arecoline and niclosamide on snail hosts of Schistosoma japonicum

In search for new local plant molluscicides for the control of the vectors of schistosomiasis, we compared the molluscicidal action of the extract of Ginkgo biloba sarcotesta by benzinum (EGSB) to that of arecoline (ARE) and niclosamide (NIC) against Oncomelania hupensis snails. NIC showed the highest toxicity on snails with 24 h LC₅₀ vales of 0.12 mg/L and LC₉₀ of 0.98 mg/L, while the LC₅₀ and LC₉₀ of EGSB were much lower than that of ARE. Sublethal in vivo 24 h exposure to 40% and 80% LC₅₀ of NIC, EGSB and ARE altered the activities of different enzymes in different body tissues of snails. EGSB could significantly inhibit Choline esterase (ChE), Alanine aminotransferase (ALT), Alkaline phosphatase (ALP) and Malic dehydrogenase (MDH) activities both in the cephalopodium and liver. ARE could significantly cause a reduction in ChE, ALP activities in the cephalopodium and ChE, ALT, ALP, Succinodehydrogenase (SDH), MDH activities in the liver. NIC significantly altered activities of ChE, ALT, ALP, SDH, and MDH in the cephalopodium and ChE, ALT, ALP, SDH activities in the liver. All molluscicides could not affect Lactate dehydrogenase (LDH) activity in the cephalopodium and the liver. Maximum inhibition of ALT and MDH activities was found in the cephalopodium and liver of snails treated with 80% of 24 h LC₅₀ of EGSB. However, NIC and ARE caused maximum reduction in ALP and SDH activities, respectively. The results indicated that molluscicidal action of EGSB was different to that of ARE and NIC in some extent.