表皮生长因子对脊髓灰质炎病毒增殖的影响

在细胞培养维持液中,加入人表皮生长因子(h-EGF),观察在不同温度下、不同浓度EGF 对脊髓灰质炎病毒生长繁殖的情况。结果发现,维持液中加含10～100ng/ml EGF,能获得最高感染滴度,高于100ng/ml 则有所下降,5ng/ml 时与对照组无差别。在36℃培养的滴度高于33℃,病毒滴度变化与温度呈平行关系。所培养的子代病毒,可被抗脊髓灰质炎Ⅰ型血清中和。10ng～100ng/ml 浓度的 EGF 对细胞不产生毒性作用。     

流感病毒感染豚鼠模型的初步建立

目的 初步建立流感病毒感染豚鼠模型.方法 通过滴鼻方式分别将A/威斯康星/67/2005(H3N2)、A/广岛/52/2005(H1N1)和B/马来西亚/2506/20043个型别的流感病毒感染豚鼠,观察感染动物的临床症状,并于感染后第1、3、5、7、9、11和13天,取鼻腔洗液和肺组织,采用细胞培养法检测病毒效价.结...     

人用H5N1禽流感裂解疫苗的制备工艺

目的设计3种工艺,制备不同裂解程度的禽流感疫苗,并观察其免疫效果。方法用禽流感毒种R1203株制备3种禽流感疫苗(全病毒、裂解-1和裂解-2),并分别以不同剂量免疫大鼠和家兔,肌肉接种2针(间隔14d),初免后14d和28d静脉采血,检测动物血清中血凝抑制抗体和中和抗体。结果两种动物在疫苗接种1针后14d,血抑抗体和中和抗体滴度均较低;接种2针后14d,均显著高于1针;裂解-2疫苗接种两种动物后的抗体反应均高于其他两种疫苗,且家兔的中和抗体量-效反应明显。结论裂解-2疫苗的工艺优于其他两种疫苗,其中和抗体能正确反映疫苗的质量。     

Heritable Variation in the Sex Pheromone of the Almond Moth, Cadra cautella

The sex pheromone of the female almond moth, Cadra cautella, constitutes a highly variable signal. Age and period of the L/D cycle had significant effects on the variation in titers of (Z,E)-9,12-tetradecadienyl acetate (Z9,E12-14:Ac) and (Z)-9-tetradecenyl acetate (Z9-14:Ac) and the ratio of Z9,E12-14:Ac to Z9-14:Ac. Across age classes, minimum and maximum mean titers (ng +/- SE) of Z9,E12-14:Ac and Z9-14:Ac ranged from 8.7 +/- 0.46 to 21 +/- 1.0 and from 2.0 +/- 0.14 to 2.9 +/- 0.15, respectively; the mean ratio of Z9,E12-14:Ac to Z9-14:Ac ranged from 5.2 +/- 0.21 to 11 +/- 0.40. The titers of Z9,E12-14:Ac and Z9-14:Ac and the ratio of Z9,E12-14:Ac to Z9-14:Ac were highest at the onset of the scotophase and lowest at the onset of the photophase. Similarly, the titer of Z9,E12-14:Ac and the ratio of Z9,E12-14:Ac to Z9-14:Ac were highest in females sampled 1 d postemergence and declined over all age classes. The titer of Z9-14:Ac increased from day 1 to day 2, and then declined to levels equivalent to day 1. Analysis of pupal and adult mass demonstrated a positive correlation (r = 0.874, P < 0.001); however, the titer of neither Z9,E12-14:Ac or Z9-14:Ac nor the ratio of Z9,E12-14:Ac to Z9-14:Ac were significantly correlated with pupal mass. Age-related variations in pheromone titer and ratios were heritable. The narrow-sense heritability of the observed variation in 1-d-old females, 1 hr into the scotophase is 1.2 +/- 0.32, 0.75 +/- 0.24, and 0.46 +/- 0.17 for the titer of Z9,E12-14:Ac and Z9-14:Ac and the ratio of Z9,E12-14:Ac to Z9-14:Ac, respectively. A significant additive genetic correlation was observed between that of Z9,E12-14:Ac and Z9-14:Ac, but not between that of either Z9,E12-14:Ac or Z9-14:Ac and the ratio of Z9,E12-14:Ac to Z9-14:Ac. The results of the genetic analyses suggest that the traits of titer of Z9,E12-14:Ac and Z9-14:Ac have a greater potential to respond to selection than the trait of ratio of Z9,E12-14:Ac to Z9-14:Ac.     

乙型脑炎减毒活疫苗(SA_(14-14-2))病毒原液及成品疫苗的稳定性观察

目的观察乙型脑炎(乙脑)减毒活疫苗(SA14-14-2)病毒原液及成品疫苗的稳定性。方法取3批乙脑减毒活疫苗病毒原液,分别于20～25、2～8、-18～-22及-38～-42℃储存,间隔一定时间取样,检测病毒滴度;将2～8、-18～-22及-38～-42℃储存的在观察末期符合规定的病毒原液制备成品疫苗,观察其于2～8℃储存的稳定性。结果3批疫苗病毒原液在20～25℃储存16h、2～8℃储存12d、-18～22℃冻存3个月及-38～-42℃冻存6个月,病毒滴度均符合《中国药典》三部(2005版)的要求;由2～8℃储存12d、-18～-22℃冻存3个月、-38～-42℃冻存6个月的病毒原液所制备的成品疫苗2～8℃储存24个月,病毒滴度下降缓慢,且热稳定性良好,符合《中国药典》三部(2005版)的要求。结论乙脑减毒活疫苗病毒原液的稳定性随温度的变化而变化,温度越低,稳定性越好;所制备的相应成品疫苗,在观察期内稳定性良好。     

抗轮状病毒LLR株G10血清型特异性单克隆抗体的制备与鉴定

目的制备抗轮状病毒(RV)LLR株G10血清型特异性单克隆抗体,并鉴定其特性。方法以纯化的RVLLR株(血清型为G10)为抗原免疫BALB/c小鼠,应用杂交瘤细胞技术筛选分泌G10血清型特异性单抗的杂交瘤细胞株。采用层析法纯化单抗,常规免疫学方法鉴定单抗的特性。结果经筛选获得5G5、1H1和7F6共3株可稳定分泌高效价且具有G10血清型特异性单抗的杂交瘤细胞株。3株细胞分泌的单抗分别为IgG2a/κ、IgG2a/κ和IgG1/κ型;腹水效价均可达1.024×106;分别识别两个抗原位点;相对亲和力依次为1H1﹥7F6﹥5G5;5G5和1H1(细胞上清)均与G1～G4和G6血清型RV抗原无交叉反应;3株杂交瘤细胞分泌的单抗均识别相对分子质量约为34000的VP7蛋白,且均有不同程度的中和活性。结论已成功制备了抗RVLLR株G10血清型特异性单抗,该单抗可用于G10血清型RV的分型检测或LLR毒株的鉴别。     

6C型肺炎链球菌抗血清的制备及鉴定

目的制备6C型肺炎链球菌抗血清,并进行鉴定。方法将经美国单克隆抗体方法鉴定为6C型的肺炎链球菌制成菌体抗原免疫家兔,制备抗血清;将抗血清与6A、6B和6C型肺炎链球菌进行荚膜肿胀和凝集试验;用6A、6B及6A和6B型肺炎链球菌吸附血清后,再次检测其与各型肺炎链球菌的凝集效价。结果免疫前的兔血清与6A、6B和6C型肺炎链球菌均未出现荚膜肿胀及凝集反应。免疫后的血清与6A、6B和6C型的凝集效价分别为1∶64、1∶32和1∶64;经6A或6A和6B型吸附后,与6A、6B和6C型的凝集效价分别为(-)、(-)和1∶8;经6B型吸附后,与6A、6B和6C型的凝集效价分别为1∶16、(-)和1∶16。结论6C型为新的肺炎链球菌血清型,已成功制备出6C型抗血清,可用于血清分型研究。     

不同补料工艺对林可霉素发酵的影响

研究补料工艺对林可霉素发酵生产的作用,考察在不同时间1次和2次补加小料对菌体形态和发酵效价的影响。结果显示：发酵过程中补糖和补硫酸铵可提高林可霉素发酵的效价,在此基础上分批增补小料对林可霉素发酵效价的增加效果更好,其中2次补小料的最优时间分别在发酵48 h和96 h。进行2次补小料的林可霉素发酵效价达到7.421 g/L,比不补小料和补1次小料林的林可霉素发酵效价分别提高192.7%和135.4%。     

新型重组人促红细胞生成素抗体中和活性检测方法的建立及其在毒理研究中的应用

目的建立新型重组人促红细胞生成素(Novel recombinant human erythropoietin,HuEPO)抗体中和活性的检测方法,并应用于毒理研究中样品的分析。方法通过考察新型rHuEPO对人UT7/EPO细胞增殖的促进作用及抗新型rHuEPO抗体(兔抗阳性血清)对该细胞增殖的抑制作用,建立抗新型rHuEPO抗体中和活性检测方法,并应用于毒理实验中对相关抗体血清中和活性的检测。结果新型rHuEPO对人UT7/EPO细胞的增殖具有促进作用,在0.125～128 ng/ml浓度范围内作用显著;抗新型rHuEPO抗体在10-1～10-4范围内对人UT7/EPO细胞的增殖具有明显的抑制作用,抑制曲线呈中和抗体性质。毒理实验中,抗新型rHuEPO抗体(SD大鼠血清)显著抑制人UT7/EPO细胞的增殖,且具有特异性;抗新型rHuEPO抗体(Beagle犬血清)对人UT7/EPO细胞的增殖无影响。结论成功建立了一种新型rHuEPO抗体中和活性检测方法,并成功应用于毒理实验样品分析,为新型rHuEPO在长期毒性实验中的免疫原性评价提供了一种有效的检测手段。     

Chemometric identification of canonical metabolites linking critical process parameters to monoclonal antibody production during bioprocess development

A deeper understanding of the biological events occurring when bioprocess parameters changed will be of great value in improving the monoclonal antibodies(mAbs) production. Design of experiment(DoE) was applied to investigate the effect of process parameters(pH, temperature shift and dissolve oxygen(DO)) on protein titer.The key metabolites connecting the critical process parameters(CPPs) with monoclonal antibody production were identified by different chemometrics tools. Finally, the biological events of marker metabolites relating with titer improvement were concluded. pH and temperature shift were identified as CPPs that affect the target protein titer. A series of metabolites influenced by the altered CPPs and correlated with protein titer were screened by principal component analysis(PCA) and Pearson' correlation test. The marker metabolites and their pathways linking CPPs to target protein titer in different culture phases were summarized. Metabolomics and chemometrics are promising data-driven tools to shine light into the biological black box between the bioprocess parameters and process performance.