利用螯合-缓冲营养液对小麦苗期磷-锌关系的研究

采用螯合-缓冲营养液培养技术(Chelator-buffer culture solution),对小麦幼苗植株的磷-锌营养进行了探讨。结果表明,高磷条件下小麦出现的缺锌黄化与磷中毒症状之间存在着明显区别,本研究结果支持高磷条件下作物出现的黄化是锌缺乏症状而非磷中毒的观点。与缺磷相比。正常供磷促进了小麦的生长,但过量磷对小麦生长有阻碍作用,而且锌的供应加剧了"促进"或"抑制"的程度。正常供应磷、锌条件下.小麦幼苗根系或地上部的磷、锌含量、吸收量及转运率均处于相对较高的水平,其余各处理则因为磷或锌供应量不适宜而使植株的磷、锌营养受到不同程度的影响。另外,磷-锌相互拮抗的作用方式及大小程度不同:磷主要影响小麦根系对锌的吸收,而锌对小麦磷营养的影响主要是通过对其从根系向地上部转运的抑制来实现的;磷对锌的影响要明显大于锌对磷的影响.磷素水平在小麦的磷、锌营养平衡中起着更为重要的作用。磷-锌拮抗作用只在双方供应不适宜的情况下发生,而且相互作用的方式及程度存在明显差异

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