抗猪传染性胃肠炎病毒杂交瘤细胞构建及单克隆抗体制备

TGEV-PL株在PK15细胞上增殖,经浓缩纯化获得TGEV抗原,建立了间接ELISA检测方法.应用杂交瘤技术获得3株分泌抗猪传染性胃肠炎病毒(TGEV)单克隆抗体(McAb)杂交瘤细胞.经检测其分泌的抗体亚类为IgG3;杂交瘤细胞染色体数为88;间接ELISA检测细胞培养上清液效价为1∶256,腹水抗体效价达1∶6×104,与6株毒(菌)株的抗原之间无交叉反应.经阻断试验证实,其分泌的McAb能识别抗原是TGEV所特有的抗原决定基.     

猪流行性腹泻病毒S蛋白中和表位区单克隆抗体的制备与鉴定

以纯化的猪流行性腹泻病毒(Porcine epidemic diarrhea virus,PEDV)S蛋白中和表位(SID)重组蛋白为抗原免疫BALB/c小鼠,利用淋巴细胞杂交瘤技术获得了6株稳定分泌抗SID区特异性的单克隆抗体细胞株,分别命名为2C4、3G3、5F8、3G5、6E6和3C3。6株杂交瘤细胞诱生小鼠产生的腹水抗体效价分别为1∶51200、1∶6400、1∶12800、1∶6400、1∶51200和1∶25600。免疫球蛋白类型均为IgG1型,轻链均为Κ链。Western blot试验结果显示,6株单克隆抗体均能特异性地识别天然PEDV中的S蛋白。     

本地毛形线虫49 Ku ES重组蛋白单克隆抗体的制备与鉴定

采用纯化的本地毛形线虫49KuES重组蛋白免疫BALB/c小鼠,取其脾细胞与SP2/0细胞融合,筛选分泌高滴度McAb的杂交瘤细胞株制备腹水。获得两株稳定分泌抗重组蛋白McAb的杂交瘤细胞株D5和C1。试剂盒鉴定两株McAb均属IgM亚类,其轻链均为K链;间接ELISA检测细胞培养液上清和腹水效价,结果显示,两株细胞培养液上清均达到1∶1.28×10~3,腹水效价均达到1∶1.28×10~4;Westetrn blot结果表明,获得的两株McAb均能特异性的识别约49Ku处的ES抗原;间接ELISA结果显示两株McAb与日本血吸虫成虫、猪囊尾蚴囊液、猪蛔虫、猪鞭虫抗原均无交叉反应,表明两株McAb特异性良好。     

猪流行性腹泻病毒N蛋白单克隆抗体的制备与鉴定

采用RT-PCR扩增猪流行性腹泻病毒(PEDV)N蛋白基因并克隆至原核表达载体pET-28a,转化到宿主表达菌BL21后经IPTG诱导表达和Ni柱纯化,SDS-PAGE和Western Blot鉴定重组N蛋白,其大小约为58 ku。将纯化重组N蛋白免疫BALB/c小鼠,通过杂交瘤细胞融合,PEDV间接ELISA方法筛选,制备获得4株能稳定分泌PEDV抗体的杂交瘤细胞株1C9、4C8、4F8和6A11。Western blot和间接免疫荧光试验证明其与PEDV均有特异性反应,单抗亚类鉴定均属于IgG1,轻链为κ型。杂交瘤细胞培养上清ELISA抗体效价为1∶1 600~6 400,腹水ELISA抗体效价达1∶1.024×105以上;4株细胞连续培养20代,其ELISA抗体效价基本一致。本研究为PEDV感染的诊断和致病机制研究提供了有用工具。     

抗猪传染性胃肠炎病毒重组S蛋白单克隆抗体的制备与鉴定

以纯化的猪传染性胃肠炎病毒(TGEV)重组S蛋白免疫BALB/c小鼠,通过细胞融合技术,间接ELISA方法进行筛选和有限稀释法3次克隆,获得2株稳定分泌抗TGEV重组S蛋白单克隆抗体的杂交瘤细胞株,分别为C7C882和B5G8G7,其染色体平均计数均为88±10对,制备腹水抗体效价分别为1:2×105和1:104,分泌抗体亚类均为IgM型.2株杂交瘤细胞上清与猪流行性腹泻病毒(PEDV)、猪轮状病毒(PRV)、猪伪狂犬病病毒(PrV)均无交叉反应,与TGEV感染细胞经间接免疫荧光检测均呈黄绿色荧光.     

大豆凝集素单克隆抗体的制备及鉴定

为获得分泌抗大豆凝集素(SBA)单克隆抗体的杂交瘤细胞,以纯化的SBA为抗原,免疫BALB/c小鼠,加强免疫3 d后取小鼠脾细胞与骨髓瘤细胞(SP2/0)融合,应用有限稀释法和间接ELISA 方法克隆筛选出2株分泌抗SBA单克隆抗体的杂交瘤细胞系A7、F12。细胞上清抗体效价均在1∶2×10³以上,腹水抗体效价均为1∶1×10⁶,单抗亚型鉴定结果均为IgG2b型,分子质量为189.6 ku,亲和常数为7.1×10⁷ mol/L,Western blotting结果表明,2株单抗具有较高的特异性。该McAb的制备为建立SBA定量检测方法奠定了基础。     

赤羽病毒单克隆抗体的研制及鉴定

用纯化的赤羽病毒（akabane virus,AKAV）免疫Balb/c小鼠,取小鼠脾细胞和骨髓瘤细胞SP2/0融合,经间接ELISA筛选和3次有限稀释法克隆,得到2株能稳定分泌抗赤羽病毒单克隆抗体（McAb）的杂交瘤细胞株,分别命名为AKAV McAb 3A株和2C株。ELISA试验和中和试验结果表明,本研究制备的2株McAb均具有良好的特异性,为AKAV阳性,杂交瘤细胞培养上清液抗体的效价分别为1∶640和1∶320,腹水的效价分别为1∶256000和1∶128000,亲和常数（Ka）分别为1.16×10^-9和6.31×10^-8 mol/L,3A株的相对亲和力大于2 C株,具有病毒中和活性,中和效价分别为1∶64和1∶32,其IgG亚类为IgG1,轻链的亚型均为kappa型,2株细胞冻存3次复苏后仍能稳定分泌抗体,表明AKAV McAb制备成功,为赤羽病快速诊断方法的研究奠定了基础。     

抗犬瘟热病毒血凝素蛋白单克隆抗体的制备与鉴定

为制备抗犬瘟热病毒(CDV)血凝素蛋白的单克隆抗体,以CDV弱毒株Onderstepoort免疫Balb/c小鼠,取其脾细胞与骨髓瘤细胞SP2/0进行融合制备杂交瘤细胞。用昆虫杆状病毒表达系统表达的血凝素蛋白作为ELISA包被抗原,进行杂交瘤细胞筛选,获得3株阳性杂交瘤细胞株,分别命名3A8、3E4和1C7。经鉴定,抗体均为IgG1亚型,轻链为kappa链。杂交瘤细胞培养上清中抗体效价为1∶64~1∶256,腹水中抗体效价为1∶10~5~1∶10~7,病毒中和试验表明,3E4对CDV具有中和活性,腹水中抗体中和效价为1∶512。制备的单克隆抗体为CDV感染动物的治疗和基因工程抗体的开发奠定了基础。     

猪传染性胃肠炎病毒M蛋白单克隆抗体的制备与鉴定

为了制备猪传染性胃肠炎病毒(TGEV)M蛋白的单克隆抗体(MAb),试验利用原核表达融合蛋白His-M免疫7周龄雌性Balb/c小鼠,以PK-15细胞培养病毒液作为检测筛选抗原,并采用淋巴细胞杂交瘤技术制备单克隆抗体。结果表明:获得2株稳定分泌抗体的阳性杂交瘤细胞株(2G1、2G2),经检测其细胞培养上清液和诱导的小鼠腹水抗体效价分别可达到1∶3 200和1∶1×10~5;连续培养15代及液氮冻存后复苏,抗体效价稳定;单克隆抗体亚型鉴定均为IgG1,轻链均为k链;MAb能够特异性识别TGEV。     

猪圆环病毒2型Cap蛋白单克隆抗体的研制及其应用

以真核表达的猪圆环病毒2型（PCV2）Cap蛋白所形成的病毒样颗粒作为免疫原,按照常规方法免疫BALB/c小鼠,取脾细胞与骨髓瘤细胞融合。经间接ELISA法和间接免疫荧光试验（IFA）筛选,总共获得了4株分泌抗PCV2 Cap蛋白单克隆抗体的杂交瘤细胞株,分别命名为7A6、3F2、3B7、1A6。4株单抗腹水效价均达到1:10⁵。IFA和免疫过氧化物酶单层实验结果显示,4株单抗均能与PCV2发生特异反应,与PCV1无交叉反应。PCV2 Cap蛋白单克隆抗体的制备,为猪圆环2型病毒抗原表位分析及其相关抗原抗体诊断试剂盒的研制奠定了基础。     

癸氧喹酯干混悬剂含量测定的改进

采用高效液相色谱法测定癸氧喹酯干混悬剂的含量,在2-250μg/mL范围内,峰面积的常用对数与进样量浓度的常用对数呈良好的线性关系,R^2=1(n=5),平均回收率为99.24%~99.51%,RSD在0.05%~0.28%。此方法分析时间短,样品前处理简便、定量结果准确,重现性好,结果满意,为其质量控制提供了依据。     

商会自治的基石——商会自治规范研究

在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。     

猪毛色遗传的研究进展

本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。     

中华人民共和国农业部公告 第267号

为贯彻落实《兽药生产质量管理规范》(简称《兽药GMP》),进一步推动兽药GMP实施进程,我部制定了《兽药生产质量管理规范检查验收办法》,现予公告。本公告自2003年6月1日起施行。附件:兽药生产质量管理规范检查验收办法二○○三年四月十日第一章 总则 第一条 为推动《兽药生产质量管理规范》(以下简称兽药GMP)的实施,规范兽药GMP检查验收工作,制定本办法。 第二条 农业部负责全国兽药GMP管理和检查验收工作;负责制修订兽药GMP检查验收管理规定;负责兽药GMP检查员队伍建设和监督管理工作,负责国际兽药贸易中GMP互认工作。 …     

鸡败血支原体垂直传播模式及其阻断方法

以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。     

Comparison of 2 methods of centesis of the bursa of the biceps brachii tendon of horses

REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air.     

不同样本商品蜂蜜中硒含量的测定

用硝酸和高氯酸消化蜂蜜,使硒游离出来,在微酸性环境下,硒和2,3-二氨基萘(DAN)生成有较强荧光的物质,用环己烷萃取,在激发波长378nm,荧光波长518nm处测定其荧光强度。蜂蜜中硒含量范围:0.10～0.82μg/g。表明:蜂蜜应视为天然富硒营养品。     

乳酸杆菌益生作用机制的研究进展

乳酸杆菌作为益生菌广泛用于人和动物。本文综述了乳酸杆菌改善宿主健康的机制。乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道。文章重点讨论了乳酸杆菌表面成分（表面蛋白、脂磷壁酸和肽聚糖）与肠道受体（Ｃ型凝集素受体、Ｔｏｌｌ样受体和 Ｎｏｄ样受体）,阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制。     

Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF

Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo.