多波长萤光分光光度法(一)

本文叙述了作者提出的多波长萤光分光光度法的原理,它可应用于二组分和三组分萤光混合物的同时测定或分别测定

多波长萤光分光光度法(二)——萤光黄、罗丹明6G和罗丹明B三组分混合物的测定

本文叙述了应用多波长萤光分光光度法测定人工样品中的萤光黄、罗丹明6G和罗丹明B_。于波长502nm直接测量萤光黄的萤光强度,罗丹明6G和罗丹明B均不干扰;罗丹明6G的测定波长λ_1为555nm,参比波长λ_2和λ_3为502nm和660nm,罗丹明B的测定波长λ_1选用585nm,参比波长λ_2、λ_4和λ_3相应为538nm、508nm和494nm,方法的相对误差一般小于6%。作者于前文叙述了多波长萤光分光光度法的原理,为了验证该原理的可靠性,特对萤光黄、罗丹明6G和罗丹明B人工混合样品进行实测。结果表明,方法原理可靠,实验操作和数据处理简便快速,三次测定平均偏差<3%

人生长激素基因在转基因鲤鱼体内的遗传

通过有性繁殖转移人生长激素基因鲤鱼(P_1),获得了转基因鲤鱼的子一代(F_1)和子二代(F_2);外源基因在转基因P_1与普通鲤鱼杂交产生的F_1代和转基因F_1代自交产生的F_2代鱼中的存在率分别为45.4%和66.7%;外源基因拷贝数在子代个体之间存在很大差异,从每细胞2拷贝到每细胞200拷贝不等;外源基因在转基因鱼子代中仍可表达具有生物功能的产物,人生长激素(hGH),并能促进鱼的生长

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