Chemical constituents of Clematoclethra scandens subsp. Actinidioides

目的研究我国特有药用植物猕猴桃藤山柳Clematoclethra scandens subsp.actinidioides的化学成分。方法采用各种柱色谱及制备液相色谱分离纯化,经理化性质和波谱数据鉴定化合物结构。结果从猕猴桃藤山柳茎叶甲醇提取物中分离得到19个化合物,分别鉴定为夏枯草皂苷A(1)、9-hydroxy-megastigma-4,7-dien-3-one-9-O-β-D-glucopyranoside(2)、山柰酚-3-O-α-L-吡喃鼠李糖苷(3)、槲皮素-3-O-α-L-吡喃鼠李糖苷(4)、槲皮素-3-O-β-D-吡喃葡萄糖苷(5)、金丝桃苷(6)、1,3,6-三-O-没食子酰..

Chemical constituents of Gymnotheca chinensis

目的研究裸蒴Gymnotheca chinensis的化学成分。方法采用多种柱色谱及制备液相色谱分离纯化,经理化性质和波谱数据鉴定结构。结果从裸蒴的甲醇提取物中分离得到16个化合物,分别鉴定为2-(1-羟基-4-羰基环己-2,5-二烯基)乙腈(1)、N-苯甲酰-2-羟基酪胺(2)、N-苯甲酰酪胺(3)、N-苯甲酰基-2-苯基乙胺(4)、7,4′-二甲氧基山柰酚(5)、蜜桔黄素(6)、桔皮晶(7)、姜黄酮A(8)、6-羟基大柱香波龙-4,7-二烯-3,9-二酮(9)、5,6-环氧-3-羟基大柱香波龙-7-烯-9-酮(10)、9-羟基大柱香波龙-4-烯-3-酮(11)、9-羟基大柱香波龙-4,7-..

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