Effects of Bap and Cr(Ⅵ)on the Growth and Ecophysiology of Mangrove Kandelia candel Seedlings

在玻璃温室、自然透光下采用人工砂基栽培，研究Bap、Cr和二者的复合污染在不同浓度梯度和不同胁迫时间下，对红树植物秋茄（Kandeliacandel）幼苗的生长及生理生态效应的影响。设置Bap的系列胁迫浓度为100、200、300、400、800µg·L-1，以不加Bap为对照；Cr6+的系列胁迫浓度为0.5、2.5、5、10、25、50、100mg·L-1，以不加Cr6+为对照；Bap和Cr的复合胁迫浓度为100、200、300µg·L-1Bap分别与5、10、25mg·L-1Cr6+的混合，以不加Bap和Cr6+为对照。培养基人工海水浓度为15‰，培养期分为40d、...In this paper, Kandelia candel hypocotyls were cultivated in sand and treated with 15‰ seawater for 40,60 and 110 days under laboratory conditions in a greenhouse. The influence of Bap(100, 200, 300, 400, 800µg·L-1), Cr6+(0.5, 2.5, 5, 10, 25, 50mg·L-1) single and combined pollution(5, 10, 25mg·L-1 Cr6+; 100, 200, 300µg·L-1 Bap) on the growth and physiological characteristics effect，inc...学位：理学硕士院系专业：生命科学学院生物学系_植物学学号：X20032600

Effects of Cr(Ⅲ) Stress on Activities and Isozymes of SOD and POD of Kandelia candel Mangrove Seedlings

砂基栽培红树植物秋茄(Kandeliacandel)幼苗60d,研究重金属Cr(Ⅲ)不同暴污强度(0~300mg/L)的环境胁迫下,对秋茄幼苗根系及叶片超氧化物歧化酶(SOD)、过氧化物酶(POD)活性的影响以及其同工酶谱的变化.结果表明:随着Cr(Ⅲ)浓度的提高,秋茄幼苗根系及叶片SOD活性均表现为先上升后下降的变化趋势,并均高于对照,其中根系SOD持最高活性的Cr浓度在25~50mg/L,叶片在10mg/L左右.受Cr(Ⅲ)胁迫,秋茄幼苗根系POD活性普遍明显高于对照,而叶片POD活性则明显低于对照.在有效防御Cr胁迫伤害方面,根系比叶片具有更大的耐受性,POD活性对Cr的敏感性大于SOD.受Cr(Ⅲ)的胁迫,秋茄幼苗根系或叶片SOD和POD活性的变化与同工酶的谱带数量和强弱的变化密切相关.In this paper,mangrove Kandelia candel hypocotyls were cultivated by sand culture and treated for 60 days in a greenhouse under natural light conditions.The influence of increasing concentration of Cr(Ⅲ) (0,10,25,50,100,150,200,300 mg/L) on the activities and isozymes of SOD and POD of mangrove K.candel seedlings was studied.The results showed that activities of SOD and POD in roots of mangrove K.candel seedlings all increased compared to the control under the Cr(Ⅲ) stress conditions.The SOD activities in roots and leaves firstly increased and then decreased with increasing concentration of Cr(Ⅲ) and their efficacious recoveries separately occurred in the conditions that Cr(Ⅲ) concentrations were about 50 mg/L and 10 mg/L.Under the Cr(Ⅲ) stress conditions,the activitiy of POD in roots increased compared to the control but the activitiy of POD in leaves obviously declined.The roots had more tolerance than the leaves did on the Cr(Ⅲ) stress and the POD activity was more sensitive than the SOD activity.Moreover,the study showed that the changes of the SOD and POD activities in roots and leaves were caused by the according variances of the SOD and POD isozymes

海上油田大处理量井下油水分离技术研究及应用

海上油田部分生产井产液量大、含水高，导致平台水处理压力大、海管外输容量受限等问题，影响到油田提液稳产。针对油田减少产出水的需求开发了单级大排量管式井下油水分离器，以海上油田H井为例，开展了管式油水分离器油水分离性能的室内实验研究，并采用Fluent软件以数值模拟方法分析了管式井下分离器入口含油率、分流比和入口流量对分离性能的影响；结合H井注采参数设计要求，确定目标井的管式井下油水分离器结构参数，并设计与井况相适应的“采下注上”的罐装泵式工艺管柱，以解决海上油田大处理量工况需求。研究表明，管式井下油水分离器可实现高效油水分离，分离出的水中含油率低于950 mg/L;罐装泵工艺结构紧凑、功能完善，能满足海上油田大处理量需求；现场试验中井下处理量最高达到2 000 m~3/d,并可将高含水油井产液中60%以上的含水直接在井下分离并回注，高峰期日减少产出水超1 200 m~3/d。本项研究可为油水旋流分离技术在海上油田的应用及实践提供借鉴

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements

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