茂县花椒化学成分分析及抑菌活性研究

综合运用多种化学分析方法对茂县花椒化学成分进行深入研究,并探索其抑菌活性,结果表明:样品水分含量9.5%,总灰分含量5.5%,总碳含量44.14%,总氮含量2.23%,碳氮比19.79,铵态氮含量13.56mg/kg,蛋白质含量9.72g/100g;经氨基酸自动分析仪检测其含有17种氨基酸,总量达到7.15%;经红外光谱、电子鼻和GC-MS定性与定量分析,其挥发性成分主要包含酯类、醛类、烯类、醇类、酮类等。抑菌活性研究表明:其对枯草芽孢杆菌和金黄色葡萄球菌等阳性菌具有明显的抑制作用,对大肠杆菌和乙型副伤寒沙门氏菌等阴性菌的抑菌活性不明显。研究较全面地分析了茂县花椒的化学基础和生物活性,为其进一步开发应用奠定一定的理论基础

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