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Effects of 24-Epibrassinolide on Antioxidant System in Cucumber Seedling Roots Under Hypoxia Stress

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Agricultural Sciences in China 2007年第3期6卷 281-289页

作者： KANG Yun-yan guo Shi-rong li Juan DUAN Jiu-ju College of Horticulture Nanjing Agricultural University Nanjing 210095 P.R.China

This article aims to study the effects of exogenous 24-epibrassinolide （EBR） on the changes in ROS, activities of antioxidative enzymes and antioxidants in cucumber （Cucumis sativus L.） seedling roots under hypoxia stress. Seedlings of a hypoxiaresistant cultivar, Lühachun 4, and a hypoxia-sensitive cultivar, Zhongnong 8, were hydroponically grown for 8 d in normoxic or hypoxic nutrient solutions that were added or not added with 10^-3 mg L^-1 EBR. Under hypoxia stress, the ROS levels and the lipid peroxidation were significantly increased in the roots upon exposure to hypoxia stress, which were inhibited by EBR application. The EBR treatment significantly increased the seedlings growth and SOD, APX, GR activities, and contents of AsA and GSH under hypoxia stress. From the results obtained in this study, it can be concluded that oxidative damage on seedling roots by hypoxia stress can be considerably alleviated and the tolerance of plants was elevated.

关键词： cucumber (Cucumis sativus L.) 24-epibrassinolide seedlings hypoxia stress antioxidative system lipid peroxidation

Spatial Genetic Structure of Two HIV-I-resistant Polymorphisms (CCR2-64 Ⅰ and SDF1-3’A) Alleles in Population of Shandong Province, China

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Biomedical and Environmental Sciences 2005年第4期18卷 241-253页

作者： FU-ZHONG XUE JIE-ZHEN WANG DAO-XIN MA guo-rong li PING HU Department of Epidemiology and Biostatistics School of Public Health Shandong University Jinan 250012 ShandongChina Qilu Hospital Shandong University Jinan 250012 Shandong China Center for Disease Control and Prevention of Shandong Province Jinan 250012 Shandong China

To explore the spatial genetic structure of two HIV-Ⅰ-resistant polymorphisms （CCR2-64 Ⅰ and SDF1-3＇A） alleles in the population of Shandong Province, China. Methods Using the techniques of spatial stratified sampling and spatial statistics, the spatial genetic structure of the locus （CCR2-64 Ⅰ and SDF1-3＇A）, which was shown to be important co-receptor for HIV infection, was quantified from the populations of 36 sampled counties of Shandong Province, and a total of 3147 and 3172 samples were taken for testing CCR2-64Ⅰ and SDF1-3＇A respectively from individuals without known history of HIV-Ⅰ infection and AIDS symptoms. Results There were significantly spatial genetic structures of the two alleles at different spatial distance classes on the scale of populations, but on the scale of individuals, no spatial structure was found in either the whole area of Shandong Province or the area of each sampled county. Although the change of frequencies of the two alleles with geographic locations in Shandong Province both showed gradual increase trends, their changing directions were inverse. The frequency of CCR2-64Ⅰallele gradually increased from the southwest to the northeast, while the frequency of SDF1-3＇A allele gradually increased from the northeast to the southwest. However the RH to AIDS of combined types of their different genotypes did not represent obvious geographic diversity on the whole area of the Province. Conclusion The frequency of allele usually has some spatial genetic structures or spatial autocorrelation with different spatial distance classes, but the genotypes of individuals have random distribution in the same geographic area. Evaluating spatial distribution of the genetic susceptibility of HIV （AIDS） to CCR2-64Ⅰand SDF1-3＇A alleles, should focus on the frequencies of combined genotypes of CCR2 and SDFI based on the two-locus genotypes of each individual rather than the frequencies of CCR2-641 and SDF1-3＇A alleles.

关键词： Spatial genetic structure Chemokine receptors HIV-Ⅰ Resistant polymorphism Relative hazard

Regulating crystallization and retarding oxidation in Sn-Pb perovskite via 1D cation engineering for high performance all-perovskite tandem solar cells

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Journal of Energy Chemistry 2025年第1期100卷 646-652页

作者： Ranran liu Xin Zheng Zaiwei Wang Miaomiao Zeng Chunxiang Lan Shaomin Yang Shangzhi li Awen Wang Min li Jing guo Xuefei Weng Yaoguang rong Xiong li Michael Gr?tzel Center for Mesoscopic Solar Cells Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced Technology Chinese Academy of Sciences School of Physics and Optoelectronic Engineering Hainan University Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO) Chinese Academy of Sciences School of Chemistry Chemical Engineering and Life Sciences State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

All-perovskite tandem solar cells have the potential to surpass the theoretical efficiency limit of single junction solar cells by reducing thermalization ***,the challenges encompass the oxidation of Sn2+to Sn4+and uncontrolled crystallization kinetics in Sn-Pb perovskites,leading to nonradiative recombination and compositional heterogeneity to decrease photovoltaic efficiency and operational ***,we introduced an ionic liquid additive,1-ethyl-3-methylimidazolium iodide （EMIMI） into Sn-Pb perovskite precursor to form low-dimensional Sn-rich/pure-Sn perovskites at grain boundaries,which mitigates oxidation of Sn2+to Sn4+and regulates the film-forming dynamics of Sn/Pb-based perovskite *** optimized single-junction Sn-Pb perovskite devices incorporating EMIMI achieved a high efficiency of 22.87%.Furthermore,combined with wide-bandgap perovskite sub-cells in tandem device,we demonstrate 2-terminal all-perovskite tandem solar cells with a power conversion efficiency of 28.34%,achieving improved operational stability.

关键词： All-perovskite tandem solar cells Sn-Pb perovskite 1D Regulated crystallization Antioxidation

A Wind Tunnel Experimental Study on the Wake Characteristics of a Horizontal Axis Wind Turbine

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Journal of Thermal Science 2025年第1期34卷 145-158页

作者： guo Xingduo li Yinran li Rennian MA Yulong WEI Kui College of Energy and Power Engineering Lanzhou University of Technology Key Laboratory of Fluid Machinery and Systems Gansu Provincial Technology Centre for Wind Turbines

The characteristics of wind turbine wakes are influenced by multiple factors,including the atmospheric boundary layer(ABL) wind and wind turbine operating conditions(e.g.,tip speed ratio and yaw angle).In this study,two types of ABL winds with different velocity gradients and turbulence intensities are generated in a wind tunnel through configurations of spires,baffles,and various numbers of roughness elements.A wind turbine with a rotor diameter of 0.8 m and a hub height of 0.6 m is tested under varying tip speed ratios,yaw angles,and ABL wind *** results indicate that the streamwise velocity deficit in the near-wake region becomes more pronounced with an increase in the tip speed ratio,while the far-wake velocity deficit remains largely unaffected by changes in the tip speed *** the yaw angle increases,the wake deflection becomes more prominent and the wake narrows;the offset of the wake center at various downstream positions grows linearly,reaching a maximum value of approximately half the rotor ***,the turbulence level and influence range in the wake region are reduced when the turbine is *** ABL wind conditions,high turbulence intensity in the incoming flow accelerates wake recovery,and the Reynolds stress at different lateral positions tends to become consistent with increasing longitudinal ***,turbulence has a significant impact on the meandering characteristics of the wind turbine wake,with greater fluctuations in the wake center observed under higher turbulence ***,this study provides insights that could inform the optimal operation of wind farms.

关键词： horizontal axis wind turbine turbulence wind tunnel experiment wind turbine wake

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和谐社会的刑事政策与公民参与

北京师范大学学报（社会科学版） 2011年第1期 119-124页

作者：郭理蓉北京师范大学刑事法律科学研究院北京100875

国家.社会本位型刑事政策符合社会发展趋势和现实国情,契合和谐社会"以人为本"的价值取向,是我国当前刑事政策改革和发展的理性选择。在国家.社会本位型刑事政策模式中,公民参与既是犯罪治理的客观必要,也是刑事政策科学化的需要,更是... 详细信息

国家.社会本位型刑事政策符合社会发展趋势和现实国情,契合和谐社会"以人为本"的价值取向,是我国当前刑事政策改革和发展的理性选择。在国家.社会本位型刑事政策模式中,公民参与既是犯罪治理的客观必要,也是刑事政策科学化的需要,更是现代社会公民的权利要求。我国目前刑事政策实践中的公民参与,无论在参与的范围还是参与的程度等方面,都存在明显不足。在构建和谐社会的背景下,完善我国刑事政策中的公民参与,需要在社会基础构建、意识培养、制度建设等方面做出努力。

关键词：刑事政策和谐社会公民参与

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宋代商业市场管理法律初探

北京工商大学学报（社会科学版） 2008年第1期23卷 97-101页

作者：柴荣郭理蓉北京师范大学北京100875

宋代是中国古代商品经济相对比较发达时期,与此相对应,其商业立法也较为完善。为了建立相对比较平等的商品交易秩序,在宋代有"均输法"和"市易法"。其目的都是为了打击大商人,限制大商人与官僚操纵垄断市场。

关键词：宋代商业市场管理均输法市易法

High-throughput screening of CO_(2) cycloaddition MOF catalyst with an explainable machine learning model

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Green Energy & Environment 2025年第1期10卷 132-138页

作者： Xuefeng Bai Yi li Yabo Xie Qiancheng Chen Xin Zhang Jian-rong li Beijing Key Laboratory for Green Catalysis and Separation and Department of Chemical Engineering College of Materials Science&EngineeringBeijing University of TechnologyBeijing100124China

The high porosity and tunable chemical functionality of metal-organic frameworks(MOFs)make it a promising catalyst design ***-throughput screening of catalytic performance is feasible since the large MOF structure database is *** this study,we report a machine learning model for high-throughput screening of MOF catalysts for the CO_(2) cycloaddition *** descriptors for model training were judiciously chosen according to the reaction mechanism,which leads to high accuracy up to 97%for the 75%quantile of the training set as the classification *** feature contribution was further evaluated with SHAP and PDP analysis to provide a certain physical understanding.12,415 hypothetical MOF structures and 100 reported MOFs were evaluated under 100℃ and 1 bar within one day using the model,and 239 potentially efficient catalysts were *** them,MOF-76(Y)achieved the top performance experimentally among reported MOFs,in good agreement with the prediction.

关键词： Metal-organic frameworks High-throughput screening Machine learning Explainable model CO_(2)cycloaddition