针对畜产品安全涉及到的多方面、多环节和多层次问题,分析畜产品质量安全管理现状,确定影响畜产品安全的主要因素,指出动物疫病风险预警是公共卫生应急及城市预警应急系统的重要组成部分。提出如何构建畜产品质量安全风险预警框架、形成风险评估及预警决策模型方法。提出采用基于地理信息系统(Geographic information system,GIS)的数字化监控系统,将流行病学数据库、地理图形、非空间应用模型和空间应用模型有机地结合,实现图形和数据资源共享。系统可及时跟踪疾病的蔓延,通过动物疫病流行病学图形分析,可提出适宜的防治措施,达到重大动物疫病预警预报目的。并对解决畜产品质量安全问题提出了建议与对策。
[Objective] This study aimed to investigate the secretory expression of P97R1 gene of Mycoplasma hyopneumoniae（Mhp） in Pichia pastoris expression system and the primary application; of the expression product. [Metho...
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[Objective] This study aimed to investigate the secretory expression of P97R1 gene of Mycoplasma hyopneumoniae（Mhp） in Pichia pastoris expression system and the primary application; of the expression product. [Method] A pair of specific primers was designed to conduct PCR according to the Mhp P97R1 gene sequence in Genbank, and the amplified P97R1 gene was cloned into the pPICZa-A yeast expression vector to construct the secretory recombinant expression vector pPICZa-A-P97R1. The plasmid pPICZa-A-p97R1 linearized by Sac I was transformed into P. pastoris GSl15 by electroporation. Positive transformant identified by PCR was incubated to express P97R1 protein after methanol induction. And the expression product was identified using SDS-PAGE and Western-blotting ***. [Result] P97R1 protein was successfully expressed in the P. pastoris system, with a secre- tory amount of 499μg/ml, and revealed good reactogenicity. Meanwhile, an indirect ELISA method was established with P97R1 protein after the optimization of each reaction factor, which showed good specificity and repeatability according to repeated tests. [Conclusion] This study provides bases for developing the ELISA Kit for anti- body detection and genetically engineered vaccine to Mhp.
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