In this study,we present the large photomultiplier tube(PMT)afterpulse measurement results obtained from the Jiangmen underground neutrino observatory(JUNO)experiment.A total of 11 dynode-PMTs(R12860)from the Hamamats...In this study,we present the large photomultiplier tube(PMT)afterpulse measurement results obtained from the Jiangmen underground neutrino observatory(JUNO)experiment.A total of 11 dynode-PMTs(R12860)from the Hamamatsu company(Hamamatsu Photonics K.K.(HPK))and 150 micro-channel plate PMTs(MCP-PMTs,GDB-6201)from the NNVT company(North Night Vision Technology Co.,Ltd.(NNVT))were tested.Subsequently,an afterpulse model was built according to the afterpulse time distribution and the probability of occurrence for these two types of PMTs.The average ratio of the total afterpulse charge with a delay between 0.5μs and 20μs to the primary pulse charge is∼5.7%(13.2%)for the tested MCPPMTs(dynode-PMTs).The JUNO experiment will deploy 20,01220-inch PMTs;this study will benefit detector simulation,event reconstruction,and data analysis regarding the JUNO experiment.展开更多
目的研究蛋白质-O-甘露糖转移酶-2(PMT2)基因对酿酒酵母复制性寿命的影响。方法依据基因同源重组原理,构建PMT2基因缺失(pmt2)或基因过表达(PMT2-ox)酵母菌株;实时定量PCR验证菌株中PMT2基因转录水平;显微镜下分离和计数酵母子细胞数目...目的研究蛋白质-O-甘露糖转移酶-2(PMT2)基因对酿酒酵母复制性寿命的影响。方法依据基因同源重组原理,构建PMT2基因缺失(pmt2)或基因过表达(PMT2-ox)酵母菌株;实时定量PCR验证菌株中PMT2基因转录水平;显微镜下分离和计数酵母子细胞数目,检测酵母细胞的复制性寿命。结果成功构建PMT2基因缺失或过表达酵母菌株,实时定量PCR证明PMT2 m RNA在pmt2菌株中无表达,在PMT2-ox菌株中表达上调。与野生型酵母细胞的平均寿命(约23代)比较,pmt2菌株的寿命为(25.2±8.9)代,PMT2-ox菌株的寿命为(24.1±7.3)代,寿命无明显延长(P>0.05)。结论酿酒酵母PMT2基因不参与复制性寿命的调控。展开更多
基金supported by Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDA10011100),Joint Institute of Nuclear Research (JINR),Russia and Lomonosov Moscow State University in Russia,joint Russian Science Foundation (RSF),DFG (Deutsche Forschungsgemeinschaft)National Natural Science Foundation of China (Nos. 12090062 and 12075087)
文摘In this study,we present the large photomultiplier tube(PMT)afterpulse measurement results obtained from the Jiangmen underground neutrino observatory(JUNO)experiment.A total of 11 dynode-PMTs(R12860)from the Hamamatsu company(Hamamatsu Photonics K.K.(HPK))and 150 micro-channel plate PMTs(MCP-PMTs,GDB-6201)from the NNVT company(North Night Vision Technology Co.,Ltd.(NNVT))were tested.Subsequently,an afterpulse model was built according to the afterpulse time distribution and the probability of occurrence for these two types of PMTs.The average ratio of the total afterpulse charge with a delay between 0.5μs and 20μs to the primary pulse charge is∼5.7%(13.2%)for the tested MCPPMTs(dynode-PMTs).The JUNO experiment will deploy 20,01220-inch PMTs;this study will benefit detector simulation,event reconstruction,and data analysis regarding the JUNO experiment.
文摘目的研究蛋白质-O-甘露糖转移酶-2(PMT2)基因对酿酒酵母复制性寿命的影响。方法依据基因同源重组原理,构建PMT2基因缺失(pmt2)或基因过表达(PMT2-ox)酵母菌株;实时定量PCR验证菌株中PMT2基因转录水平;显微镜下分离和计数酵母子细胞数目,检测酵母细胞的复制性寿命。结果成功构建PMT2基因缺失或过表达酵母菌株,实时定量PCR证明PMT2 m RNA在pmt2菌株中无表达,在PMT2-ox菌株中表达上调。与野生型酵母细胞的平均寿命(约23代)比较,pmt2菌株的寿命为(25.2±8.9)代,PMT2-ox菌株的寿命为(24.1±7.3)代,寿命无明显延长(P>0.05)。结论酿酒酵母PMT2基因不参与复制性寿命的调控。
