新冠病毒的现场可视化LAMP检测及其冷链食品分析应用

建立了一种基于环介导等温扩增技术(Loop-mediated Isothermal Amplification,LAMP)和核酸分子"光开关"[Ru(phen)₂dppz]²⁺相结合的新型冠状病毒高灵敏可视化检测方法。分别采用保温杯代替实验室恒温装置,采用蓝光手电代替蓝光透射仪,实现了新冠病毒的现场快速可视化LAMP检测。针对新型冠状病毒N基因设计特异性序列引物,采用[Ru(phen)₂dppz]²⁺分子光开关的特性检测LAMP扩增产物,结果可以借助蓝光手电直接通过肉眼观察是否出现红色荧光进行判定。该方法可检测到单个拷贝数的新型冠状病毒基因片段,并具有高度特异性,检验快速,整个过程仅需40min即可目视观察结果。对新冠病毒假病毒人工污染的模拟冷链食品进行检测,结果与目前新型冠状病毒检测金标准实时荧光定量PCR法吻合度为100%。该方法仅需保温杯和蓝光手电,可以作为实时荧光PCR方法的补充,为食品新冠病毒的现场筛查提供快速高效的技术支持。     

水产品和水体中创伤弧菌现场可视化环介导恒温扩增快检方法的建立及应用

目的 基于环介导恒温扩增(LAMP)技术建立水产品和养殖水域中创伤弧菌现场可视化快速、简便的检测方法。方法 以创伤弧菌作为研究对象,分别采用煮沸法和离心柱法提取基因组DNA,优化简便、快速的弧菌DNA提取方法;以创伤弧菌gyrB基因作为靶基因,设计筛选最佳的适于LAMP的引物序列,分别通过LAMP荧光扩增曲线(加SYTO-9 荧光染料),以及LAMP可视化观察扩增产物的颜色变化(加钙黄绿素),开展特异性、灵敏度和重复性试验分析。结果 确定煮沸法为适合于弧菌基因组DNA提取的快捷方法;优化筛选的引物可以特异地检测创伤弧菌,检测核酸浓度的灵敏度可以达到10 fg/μL,并且结果稳定、可靠。采用该方法进行实际样品的检测应用,在558份水体样品和655份水产品样品中,创伤弧菌阳性检出率分别为9.01%和8.60%,阳性检出率高于传统的分离培养鉴定结果。结论 低技术要求、低设备成本以及检测时间短使得可视化LAMP快检方法成为现场可使用的一个理想选择,对于水产养殖业来说也更方便。     

基于LAMP的WEB安全模型

从Linux平台安全、Apache安全、MySQL数据库安全及PHP开发技术等几个方面探讨了如何架设一个安全高效的WEB网站技术,并给出了一个可行的安全模型。     

CRISPR/Cas12-Based Ultra-Sensitive and Specific Point-of-Care Detection of HBV

Hepatitis B remains a major global public health challenge, with particularly high prevalence in medically disadvantaged western Pacific and African regions. Although clinically available technologies for the qPCR detection of HBV are well established, research on point-of-care testing has not progressed substantially. The development of a rapid, accurate point-of-care test is essential for the prevention and control of hepatitis B in medically disadvantaged rural areas. The development of the CRISPR/Cas system in nucleic acid detection has allowed for pathogen point-of-care detection. Here, we developed a rapid and accurate point-of-care assay for HBV based on LAMP-Cas12a. It innovatively solves the problem of point-of-care testing in 10 min, particularly the problem of sample nucleic acid extraction. Based on LAMP-Cas12a, visualization of the assay results is presented by both a fluorescent readout and by lateral flow test strips. The lateral flow test strip technology can achieve results visible to the naked eye, while fluorescence readout can achieve real-time high-sensitivity detection. The fluorescent readout-based Cas12a assay can achieve HBV detection with a limit of detection of 1 copy/μL within 13 min, while the lateral flow test strip technique only takes 20 min. In the evaluation of 73 clinical samples, the sensitivity and specificity of both the fluorescence readout and lateral flow test strip method were 100%, and the results of the assay were fully comparable to qPCR. The LAMP-Cas12a-based HBV assay relies on minimal equipment to provide rapid, accurate test results and low costs, providing significant practical value for point-of-care HBV detection.     

基于LAMP的网站流量分析系统图表功能的设计与实现

阐述了基于LAMP架构开发设计的网站流量分析系统的结构模型,并对JpGraph配置进行了详细的分析,对图表功能做了进一步的实现,展示了运行效果。     

应用LAMP方法检测动物源性食品中沙门菌

目的运用两种方法对动物源性食品中沙门菌进行检测,找出一种更加快速、敏感、特异、简便的检验方法。方法采集60份市售的禽、畜等生肉及60份奶制品,分别采用LAMP方法和国家标准方法GB/T4789.4—2008对沙门菌进行分离与鉴定。结果 120份采集样品中,LAMP方法检出2例,阳性率1.67%;国家标准方法检出1例,阳性率0.83%。LAMP方法的符合率为99.2%,敏感性为100%,特异性为99.2%。结论 LAMP检测法快速、特异、简便,该方法与国标法的阳性率差异无显著性。