利用新型一次性激流灌注式生物反应器培养动物细胞

利用新型一次性培养袋在5～10L激流灌注式生物反应器中培养3种贴壁和3种悬浮细胞,通过在线控制培养温度、pH值和溶氧等工艺参数,监测并分析培养过程中细胞密度、活率、糖耗等的变化情况.结果表明,贴壁培养细胞MDCK,VERO和DF-1培养6d后消化计数,密度分别达4.8×106,1.0×107和1.5×107mL-1,细胞状态良好,活率在90%以上.悬浮细胞CHO,BHK-21和Sf9经无血清悬浮驯化后,经种子链扩增,在激流式反应器中悬浮培养的初始接种密度分别为2.0×106,2.1×106和2.15×106mL-1时,培养一段时间后其最高培养密度分别可达2.0×107,2.1×107和1.8×107mL-1,维持培养时间分别为13,12和10d

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