Objective:To evaluate effects of diagnostic tests for Helicobacter pylori(H.pylori)infec- tion.Methods:A meta-analysis was conducted in 22 identified studies through Chinese literature searching which were published a...Objective:To evaluate effects of diagnostic tests for Helicobacter pylori(H.pylori)infec- tion.Methods:A meta-analysis was conducted in 22 identified studies through Chinese literature searching which were published after 1995 and evaluated diagnostic tests for Helicobacter pylori(H.pylori)infec- tion.Results:Polymerase chain reaction(PCR)had the best performance with diagnostic odds ratio (DOR)of 6.7(5.5-7.8),followed by ^(13)C urea breath test and Enzyme-linked immunosorbent assay (ELISA)quantitative serological test,with DOR being 6.4(5.4-7.4)and 4.5(3.8-5.2),respectively. Conclusion:Non-invasive tests are the appropriate methods for screening H.pylori infection,whereas in- vasive tests are the best methods for ascertaining the suspected patients.展开更多
口蹄疫的有效控制关键在于早期检测 ,然而有很多疾病症状与口蹄疫相似 ,仅靠临床症状难以确诊 ,因此必须进行实验室诊断。实验室诊断包括病毒学诊断和血清学诊断。病毒学诊断方法有病毒分离、补体结合试验、酶联免疫吸附试验 ( EL ISA)...口蹄疫的有效控制关键在于早期检测 ,然而有很多疾病症状与口蹄疫相似 ,仅靠临床症状难以确诊 ,因此必须进行实验室诊断。实验室诊断包括病毒学诊断和血清学诊断。病毒学诊断方法有病毒分离、补体结合试验、酶联免疫吸附试验 ( EL ISA)、RT-PCR以及乳胶凝集试验 ( L AT)。 RT-PCR有待进一步完善 ,而用于野外检测的现场诊断方法已取得可喜进展。血清学诊断包括中和试验和 EL ISA,中和试验已经被 EL ISA方法取代 ,并且通过检测非结构蛋白的抗体可以区分感染动物和免疫动物。更加快速、敏感、可靠以及用于检测潜伏感染的诊断技术将是今后研究的热点。展开更多
By mating transgenic mice, transgenic mice model of high expression of foreign gene was screened. Making use of conventional way of breeding to mate 2(A♀,B♂)transgenic mice integrated Hepatitis B virus(HBV) gene, 2A...By mating transgenic mice, transgenic mice model of high expression of foreign gene was screened. Making use of conventional way of breeding to mate 2(A♀,B♂)transgenic mice integrated Hepatitis B virus(HBV) gene, 2A(♀♂) and 2B(♀♂)transgenic homozygote mice, and 6 bi-heterozygote mice(4♀2♂) by mating A and B homozygote mice were taken. Blood serum of these transgenic mice and their off-springs’ were collected, and HBV DNA expressing in blood serum of transgenic mice was tested by polymerase chain reaction and ELISA (PCR- ELISA). The results were as follows: HBV DNA expression in the blood of bi-heterozygote mice was much more than that of homozygote and heterozygote mice. Breeding bi-heterzygote mice is likely to be a good way of high expression of foreign gene in transgenic animals.展开更多
从日本引进的西瓜种子隔离种植后,采用生物学、双抗体夹心酶联方法及反转录PCR(RT-PCR)技术对其幼苗样品进行了黄瓜绿斑驳花叶病毒(Cucumber green mottle mosaic virus,CGMMV)的检测,结果表明:生物学试验接种的黄瓜健康植株全部发病;...从日本引进的西瓜种子隔离种植后,采用生物学、双抗体夹心酶联方法及反转录PCR(RT-PCR)技术对其幼苗样品进行了黄瓜绿斑驳花叶病毒(Cucumber green mottle mosaic virus,CGMMV)的检测,结果表明:生物学试验接种的黄瓜健康植株全部发病;双抗体夹心酶联试验结果均为阳性;RT-PCR反应后进行1%琼脂糖凝胶电泳检测,结果出现预期的715 bp特异性扩增产物。3种方法均表明此次从日本引进的西瓜种质已经受到黄瓜绿斑驳花叶病毒的侵染,须做销毁处理。试验结果表明,采用3种方法中的2种对样品进行检测,即可以根据检测结果确诊被检对象是否带有CGMMV病毒。展开更多
文摘Objective:To evaluate effects of diagnostic tests for Helicobacter pylori(H.pylori)infec- tion.Methods:A meta-analysis was conducted in 22 identified studies through Chinese literature searching which were published after 1995 and evaluated diagnostic tests for Helicobacter pylori(H.pylori)infec- tion.Results:Polymerase chain reaction(PCR)had the best performance with diagnostic odds ratio (DOR)of 6.7(5.5-7.8),followed by ^(13)C urea breath test and Enzyme-linked immunosorbent assay (ELISA)quantitative serological test,with DOR being 6.4(5.4-7.4)and 4.5(3.8-5.2),respectively. Conclusion:Non-invasive tests are the appropriate methods for screening H.pylori infection,whereas in- vasive tests are the best methods for ascertaining the suspected patients.
文摘口蹄疫的有效控制关键在于早期检测 ,然而有很多疾病症状与口蹄疫相似 ,仅靠临床症状难以确诊 ,因此必须进行实验室诊断。实验室诊断包括病毒学诊断和血清学诊断。病毒学诊断方法有病毒分离、补体结合试验、酶联免疫吸附试验 ( EL ISA)、RT-PCR以及乳胶凝集试验 ( L AT)。 RT-PCR有待进一步完善 ,而用于野外检测的现场诊断方法已取得可喜进展。血清学诊断包括中和试验和 EL ISA,中和试验已经被 EL ISA方法取代 ,并且通过检测非结构蛋白的抗体可以区分感染动物和免疫动物。更加快速、敏感、可靠以及用于检测潜伏感染的诊断技术将是今后研究的热点。
文摘By mating transgenic mice, transgenic mice model of high expression of foreign gene was screened. Making use of conventional way of breeding to mate 2(A♀,B♂)transgenic mice integrated Hepatitis B virus(HBV) gene, 2A(♀♂) and 2B(♀♂)transgenic homozygote mice, and 6 bi-heterozygote mice(4♀2♂) by mating A and B homozygote mice were taken. Blood serum of these transgenic mice and their off-springs’ were collected, and HBV DNA expressing in blood serum of transgenic mice was tested by polymerase chain reaction and ELISA (PCR- ELISA). The results were as follows: HBV DNA expression in the blood of bi-heterozygote mice was much more than that of homozygote and heterozygote mice. Breeding bi-heterzygote mice is likely to be a good way of high expression of foreign gene in transgenic animals.
