Objectives: To compare multiplex fluorescent PCRwith serum type-specific antibody detection in thediagnosis of herpes simplex virus (HSV) infection andto evaluate its significance in the diagnosis of genitalherpes.Met...Objectives: To compare multiplex fluorescent PCRwith serum type-specific antibody detection in thediagnosis of herpes simplex virus (HSV) infection andto evaluate its significance in the diagnosis of genitalherpes.Methods: We detected HSV infection in 121 speci-mens collected from patients with genital herpesusing both multiplex fluorescent PCR and serum type-specific antibody detection. HSV viral isolation wasused as the standard control.Results: When compared with the viral isolation, thesensitivity and specificity for multiplex fluorescentPCR were 100% and 88.89%, respectively afterdiscrepant analysis. The sensitivity and specificity fortype-specific antibody detection was 77.68 % and77.78 %, respectively. However, the type-specificantibody detected HSV in two asymptomatic patientswhile the multiplex fluorescent PCR couldn’t detectany HSV DNA from those specimens.Conclusions: Multiplex fluorescent PCR is a verysensitive and specific method for detection and typingof HSV in the lesion of genital herpes, it failed todetect HSV DNA from the asymptomatic patients.Serum type-specific antibody detection was a lesssensitive and specific test but could detect the specificantibody from some asymptomatic patients. Thecombination of these two techniques would allow rapid,sensitive and accurate detection and typing of HSVand help clinical diagnosis and epidemiologic survey-ing of genital herpes.展开更多
We report the experimental results of hybrid four-wave mixing and fluorescence signals from nitrogen-vacancy(NV)centers in diamond. The fluorescence signals are slowed owing to dark state. The observed delay time of l...We report the experimental results of hybrid four-wave mixing and fluorescence signals from nitrogen-vacancy(NV)centers in diamond. The fluorescence signals are slowed owing to dark state. The observed delay time of light slowing due to interconversion between NV^- and NV^0 is about 6.4 μs. The relative intensities of read-out signals change with the wavelength and power of writing pulse. Based on light slowing, we present the model of all-optical time division multiplexing. The intensity ratio in different demultiplexed channels is modulated by the wavelength and power of control field. It has potential applications in quantum communication and all-optical network.展开更多
Trisomy 21, also named Down syndrome was the most frequent autosomal aneuploidy and the most common cause of mental retardation. Fifty percent patients had congenital heart malformation. Every 20 minutes one case of t...Trisomy 21, also named Down syndrome was the most frequent autosomal aneuploidy and the most common cause of mental retardation. Fifty percent patients had congenital heart malformation. Every 20 minutes one case of trisomy 21 was born, and the incidence rate was 1 in 600 to 800 newborns in China.1 In two thirds of cases with trisomy 21, there was a spontaneous abortion, so the actual incidence was higher than that obtained postnatally.展开更多
建立了食品中4种常见食源性致病菌的微流控芯片快速检测方法。根据副溶血弧菌的Vpara（16S-23SrDNAIGS）基因、沙门菌的invA基因、大肠杆菌O157：H7的rfbO157基因和志贺菌的ipaH基因序列设计了4对特异性引物，对上述致病菌进行四重PCR...建立了食品中4种常见食源性致病菌的微流控芯片快速检测方法。根据副溶血弧菌的Vpara（16S-23SrDNAIGS）基因、沙门菌的invA基因、大肠杆菌O157：H7的rfbO157基因和志贺菌的ipaH基因序列设计了4对特异性引物，对上述致病菌进行四重PCR扩增，采用微流控芯片-激光诱导荧光检测食品中4种常见致病菌的多重PCR扩增产物。优化了多重PCR扩增和微流控芯片电泳分离的实验条件。当芯片电泳的筛分介质HPMC-50浓度为2．2％、溴乙锭（EB）含量为3．75μmol／L、电场强度为120V／cm时，pUC Mix DNA Marker8和待测致病菌的多重PCR扩增产物可以实现基线分离，600S内即可完成上述4种致病菌的同时检测，迁移时间的日内相对标准偏差为0．74％～2．09％。本方法能够检出1×10^2cfu／mL的副溶血弧菌、沙门菌、大肠杆菌O157：H7和志贺菌。方法特异性高，所设计的引物在10种非目的菌株体系中均未见扩增的片段。将本法应用于食品中上述致病菌的测定，获得了满意的结果，为常见食源性致病菌的快速检测提供了一种新的可靠分析手段，对保障食品安全具有重要的现实意义。展开更多
文摘Objectives: To compare multiplex fluorescent PCRwith serum type-specific antibody detection in thediagnosis of herpes simplex virus (HSV) infection andto evaluate its significance in the diagnosis of genitalherpes.Methods: We detected HSV infection in 121 speci-mens collected from patients with genital herpesusing both multiplex fluorescent PCR and serum type-specific antibody detection. HSV viral isolation wasused as the standard control.Results: When compared with the viral isolation, thesensitivity and specificity for multiplex fluorescentPCR were 100% and 88.89%, respectively afterdiscrepant analysis. The sensitivity and specificity fortype-specific antibody detection was 77.68 % and77.78 %, respectively. However, the type-specificantibody detected HSV in two asymptomatic patientswhile the multiplex fluorescent PCR couldn’t detectany HSV DNA from those specimens.Conclusions: Multiplex fluorescent PCR is a verysensitive and specific method for detection and typingof HSV in the lesion of genital herpes, it failed todetect HSV DNA from the asymptomatic patients.Serum type-specific antibody detection was a lesssensitive and specific test but could detect the specificantibody from some asymptomatic patients. Thecombination of these two techniques would allow rapid,sensitive and accurate detection and typing of HSVand help clinical diagnosis and epidemiologic survey-ing of genital herpes.
基金Project supported by the National Key Research and Development Program of China(Grant Nos.2017YFA0303700 and 2018YFA0307500)the National Natural Science Foundation of China(Grant Nos.61605154,11604256,and 11804267)。
文摘We report the experimental results of hybrid four-wave mixing and fluorescence signals from nitrogen-vacancy(NV)centers in diamond. The fluorescence signals are slowed owing to dark state. The observed delay time of light slowing due to interconversion between NV^- and NV^0 is about 6.4 μs. The relative intensities of read-out signals change with the wavelength and power of writing pulse. Based on light slowing, we present the model of all-optical time division multiplexing. The intensity ratio in different demultiplexed channels is modulated by the wavelength and power of control field. It has potential applications in quantum communication and all-optical network.
基金This work was supported by grants from the National Natural Science Foundation of China (No. 30200107) as well as fund from the Chenguang Plan of Wuhan City (No. 20025001027).
文摘Trisomy 21, also named Down syndrome was the most frequent autosomal aneuploidy and the most common cause of mental retardation. Fifty percent patients had congenital heart malformation. Every 20 minutes one case of trisomy 21 was born, and the incidence rate was 1 in 600 to 800 newborns in China.1 In two thirds of cases with trisomy 21, there was a spontaneous abortion, so the actual incidence was higher than that obtained postnatally.
文摘建立了食品中4种常见食源性致病菌的微流控芯片快速检测方法。根据副溶血弧菌的Vpara（16S-23SrDNAIGS）基因、沙门菌的invA基因、大肠杆菌O157：H7的rfbO157基因和志贺菌的ipaH基因序列设计了4对特异性引物，对上述致病菌进行四重PCR扩增，采用微流控芯片-激光诱导荧光检测食品中4种常见致病菌的多重PCR扩增产物。优化了多重PCR扩增和微流控芯片电泳分离的实验条件。当芯片电泳的筛分介质HPMC-50浓度为2．2％、溴乙锭（EB）含量为3．75μmol／L、电场强度为120V／cm时，pUC Mix DNA Marker8和待测致病菌的多重PCR扩增产物可以实现基线分离，600S内即可完成上述4种致病菌的同时检测，迁移时间的日内相对标准偏差为0．74％～2．09％。本方法能够检出1×10^2cfu／mL的副溶血弧菌、沙门菌、大肠杆菌O157：H7和志贺菌。方法特异性高，所设计的引物在10种非目的菌株体系中均未见扩增的片段。将本法应用于食品中上述致病菌的测定，获得了满意的结果，为常见食源性致病菌的快速检测提供了一种新的可靠分析手段，对保障食品安全具有重要的现实意义。
