不同LED光质对迭鞘石斛生理及品质的影响

设置6种光质,自然光(对照,N5)、100%红光+0%蓝光(R5)、100%蓝光+0%红光(B5)、80%红光+20%蓝光[RB(4:1)]、60%红光+40%蓝光[RB(3:2)]、40%红光+60%蓝光[RB(2:3)],测定不同处理时间迭鞘石斛的生理指标以及多糖、黄酮的含量.结果显示光质对迭鞘石斛生理及品质有较为明显的影响.B5处理组的超氧化物歧化酶含量最高;R5处理组的丙二醛含量最高.RB(3:2)处理组的叶绿素含量最高,RB(2:3)处理组的可溶性糖、可溶性蛋白、多糖含量都最高;N5处理组的黄酮含量最高.R5处理组的叶绿素、可溶性糖、可溶性蛋白、多糖和黄酮含量都较低,说明纯红光并不利于迭鞘石斛生长.此外,不同处理天数下丙二醛、可溶性蛋白、可溶性糖、多糖和黄酮含量整体上呈现上升趋势;超氧化物歧化酶活力整体下降趋势;叶绿素含量整体上呈现先下降后上升的趋势.本研究说明红蓝光配比有利于迭鞘石斛生长发育和次生代谢物质积累,对迭鞘石斛组培苗的光控培养和品质改良具有生产上的指导意义

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