PCR-CE检测溶脲脲原体生物群的实验研究

建立了一种通用引物，PCR-CE检测溶脲脲原体2个生物群的方法．对这个方法进行了敏感性、特异性及重复性的研究，并与通用引物-PCR-琼脂糖凝胶电泳法进行了比较。研究表明，通用引物-PCR-CE法敏感性高．特异性强．重复性好．在区分溶脲脲原体2个生物群能力上要优于通用引物-PCR-琼脂糖电泳法

溶脲脲原体及其两个生物群与非淋菌性尿道炎相关性的研究

目的 阐明溶脲脲原体及其2个生物群与非淋菌性尿道炎的关系。方法 使用通用引物-PCR-毛细管电泳法对淋菌性尿道炎组，非淋菌性尿道炎组和对照组中的溶脲脲原体的2个生物群进行检测。结果 溶脲脲原体生物群2在非淋菌性尿道炎中的检出率高于对照组（P〈0．05），溶脲脲原体生物群1在淋菌性尿道炎中的检出率低于对照组（P〈0．05），而在非淋菌性尿道炎和对照组中，溶脲脲原体生物群1的检出率差异无显著性（P〉0．05）。结论 溶脲脲原体生物群2是和非淋菌性尿道炎有一定关系的，溶脲脲原体生物群2可能才是引起非淋尊性尿道炎的病原体之一，而生物群1不引起非淋菌性尿道炎，淋球菌的增殖有可能抑制尿道中的溶脲脲原体生物群1的生长

Effects of Surface Properties and Microstructures of Carbon Nanofibers on Their Electrocatalytic Activity for Oxygen Reduction Reaction

采用超声处理的方法分别对管式纳米碳纤维(T-Cnf)和鱼骨式纳米碳纤维(f-Cnf)进行了表面化学处理.XPS结果表明,在混酸(浓硫酸+浓硝酸)和氨水中进行超声化学处理可以在Cnf表面分别引入含氧官能团和含氮官能团.电化学测试结果表明,2种不同微结构Cnf的氧还原催化活性都遵循相同的趋势,即Cnf-P<Cnf-O<Cnf-On,且鱼骨式Cnf的催化活性好于相应的管式Cnf.这说明纳米碳纤维的表面性质和微结构都会影响其在碱性溶液中的氧还原催化活性,而前者的影响可能更大些.另外,T-Cnf-On和f-Cnf-On均表现出了很高的氧还原催化活性.Two types of carbon nanofibers(CNFs),tubular CNFs(t-CNFs) and fish-bone CNFs(f-CNFs) were synthesized and the effects of surface properties of CNFs on their electrocatalytic activity for oxygen reduction reaction(ORR) in alkaline media were investigated.Oxygen- and nitrogen-containing functional groups were introduced onto the CNF surface by sonochemical oxidation in mixed acids(concentrated sulfuric acid and nitric acid) and ammonia,respectively.The ORR activities of the CNF catalyst were measured in an oxygen-saturated 0.1 mol/L KOH electrolyte solution by rotating disk electrode(RDE) technique.The RDE results show that the electrocatalytic activities of the two types of CNFs increase in the same sequence untreated CNFs < oxygen-containing CNFs < nitrogen-containing CNFs,while the f-CNFs-based catalysts have higher electrocatalytic activities for ORR than t-CNFs-based counterparts.The results indicate that both the surface properties and the microstructures of CNFs have effects on the electrocatalytic activity of CNFs for ORR,although the former may have a dominant effect.国家自然科学基金(批准号:21073061);厦门大学固体表面物理化学国家重点实验室开放基金资

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies