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绛红褐链霉菌CC2-6抑制大白菜根肿病的效果及机制分析

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园艺学报 2024年第5期51卷 1137-1150页

作者：王青胡燕陈姗陆景伟郑阳陶伟林孙现超周娜陈国康西南大学植物保护学院重庆400716 重庆市农业科学院蔬菜花卉研究所重庆401329 浙江省嘉善县林业技术推广站浙江嘉善314199

为筛选可抑制芸薹根肿菌(Plasm odiophora brassicae)的生防菌株,以棉花枯萎病尖孢镰刀菌(Fusarium oxysporum)为指示菌,通过平板对峙法筛选出优良菌株CC2-6,其抑制率为50.03%;该菌株发酵液能抑制根肿菌休眠孢子萌发及根肿菌根毛侵染,提... 详细信息

为筛选可抑制芸薹根肿菌(Plasm odiophora brassicae)的生防菌株,以棉花枯萎病尖孢镰刀菌(Fusarium oxysporum)为指示菌,通过平板对峙法筛选出优良菌株CC2-6,其抑制率为50.03%;该菌株发酵液能抑制根肿菌休眠孢子萌发及根肿菌根毛侵染,提前7 d接菌CC2-6对大白菜根肿病的盆栽防效为53.20%。同时,该菌株CC2-6对包括烟草叶斑病菌(Pestalotiopsis nicotiae)等9种病原菌均有抑制效果,其抑菌率在47.20%~76.19%,表明菌株CC2-6具有广谱抑菌活性。形态学观察及16S rDNA基因序列分析,初步鉴定菌株CC2-6为绛红褐链霉菌(Streptomyces purpeofuscus)。菌株CC2-6可产生蛋白酶、纤维素酶、几丁质酶,其发酵液可诱导大白菜中的PPO、POD、PAL活性增强,SA、JA含量升高,降低ET含量。GC-TOF/LC-QTOF/QE非靶标代谢组学检测结果表明,菌株CC2-6发酵液中含有潮霉素B(Hygromycin B)、喜树碱(Camptothecin)、2–苯乙醇(2-Phenylethanol)、柠檬酸(Citric acid)等抑菌活性物质,表明CC2-6可能通过产生上述化合物抑制根肿菌侵染寄主。

关键词：根肿菌生防放线菌绛红褐链霉菌诱导抗性代谢产物

RMB Exchange Rate,Overseas Education,and High-Quality Economic Growth

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Contemporary Social Sciences 2023年第6期8卷 97-118页

作者： sun Yuchen sun xianchao Sichuan Normal University

China is transitioning its industrial structure from labor-and resource-intensive industries that previously contributed significantly to the country’s GDP growth to technology-intensive industries emphasizing a highly-skilled workforce and sustainability to achieve high-quality economic *** paper examines the impact of the RMB exchange rate on high-quality economic growth through theoretical modeling and empirical analysis and discusses the variable of overseas education to explore the mechanism of how the RMB exchange rate and overseas education jointly impact high-quality economic *** research sample includes the National Bureau of Statistics data on education from 1995 to 2015,the Bank for International Settlements(BIS)data on the RMB exchange rate,and the added value of China’s high-quality economic growth estimated based on the national economy *** empirical analysis of theoretical expectations was conducted,finding that RMB appreciation could make a positive contribution to China’s high-quality economic growth;RMB exchange rate fluctuations would impact the relative cost of overseas education and overseas returnees could have a positive impact on domestic resource utilization efficiency and domestic capacity to make sci-tech innovations,thereby injecting vitality to high-quality economic *** study focuses on both the RMB exchange rate and the population studying abroad,providing additional observation dimensions to existing research.

关键词： RMB exchange rate overseas education high-quality economic growth

Stock Market Turnover and China’s Real Estate Market Price: An Empirical Study Based on VAR

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Contemporary Social Sciences 2022年第4期7卷 17-38页

作者： sun xianchao Huang Chengjie School of Economics and Management Sichuan Normal UniversityChengduSichuan610066China

Our analysis used the monthly data of the average sales price of commodity houses and stock turnover in the Shenzhen Stock Exchange from January 2016 to December 2020. We selected this data to establish a Vector Autoregression(VAR) model using the Granger causality test to investigate the correlation between the stock market and the real estate market. We found that there is a significant positive correlation between the stock market and the real estate market. We also found that the real estate market price is the one-way Granger cause for the stock market turnover, and that changes in the real estate market price have a significant role in forecasting changes in stock market turnover. Therefore, the linkage between the two markets should be considered in macro regulations, and the impact on one of the markets should be considered when regulating the other.

关键词： stock market turnover real estate prices VAR model Granger causality test

Genome-wide analysis of NDR1/HIN1-like genes in pepper(Capsicum annuum L.)and functional characterization of CaNHL4 under biotic and abiotic stresses

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Horticulture Research 2020年第1期7卷 1611-1625页

作者： Changyun Liu Haoran Peng Xinyu Li Chaolong Liu Xing Lv Xuefeng Wei Aihong Zou Jian Zhang Guangjin Fan Guanhua Ma Lisong Ma xianchao sun Laboratory of plant immunity and ecological control of plant disease College of Plant ProtectionSouthwest University400716 ChongqingChina Department of Botany and Plant Biology Section of BiologyFaculty of ScienceUniversity of Geneva1211 Geneva 4Switzerland State Key Laboratory of North China Crop Improvement and Regulation College of Plant ProtectionHebei Agricultural University071001 BaodingChina

Plant NDR1/HIN1-like(NHL)genes play an important role in triggering plant defenses in response to biotic *** this study,we performed a genome-wide identification of the NHL genes in pepper(Capsicum annuum L.)and characterized the functional roles of these CaNHL genes in response to abiotic stresses and infection by different *** analysis revealed that CaNHLs can be classified into five distinct subgroups,with each group containing generic and specific *** element analysis showed that the majority of the promoter regions of the identified CaNHLs contain jasmonic acid(JA)-responsive and salicylic acid(SA)-responsive elements,and transcriptomic analysis revealed that CaNHL genes are expressed in all the examined tissues of *** CaNHL1,CaNHL4,CaNHL6,CaNHL10,CaNHL11,and CaNHL12 genes were significantly upregulated under abiotic stress as well as in response to different pathogens,such as TMV,Phytophthora capsici and Pseudomonas *** addition,we found that CaNHL4 localizes to the plasma ***4-silenced pepper plants display significantly increased susceptibility to TMV,Phytophthora capsici and Pseudomonas syringae,exhibiting reduced expression of JA-related and SA-related genes and reduced ROS ***,transient overexpression of CaNHL4 in pepper increases the expression of JArelated and SA-related genes,enhances the accumulation of ROS,and inhibits the infection of these three ***,for the first time,we identified the NHL genes in pepper and demonstrated that CaNHL4 is involved in the production of ROS and that it also regulates the expression of JA-related and SA-related genes in response to different pathogens,suggesting that members of the CaNHL family play an essential role in the disease resistance of pepper.

关键词： pepper analysis functional

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基于改进萤火虫算法的覆盖优化方法

传感技术学报 2021年第12期34卷 1676-1683页

作者：苟平章孙现超西北师范大学计算机科学与工程学院甘肃兰州730070

针对无线传感器网络中目标区域仅部署静态节点和移动节点时,分别存在覆盖率低和成本高的问题,提出一种基于改进萤火虫算法的覆盖优化方法。首先,将静态和移动传感器节点随机部署在目标区域内,改进位置公式和步长因子,提高全局搜索能力,... 详细信息

针对无线传感器网络中目标区域仅部署静态节点和移动节点时,分别存在覆盖率低和成本高的问题,提出一种基于改进萤火虫算法的覆盖优化方法。首先,将静态和移动传感器节点随机部署在目标区域内,改进位置公式和步长因子,提高全局搜索能力,加快搜索速度;其次,利用改进萤火虫算法初步确定移动传感器节点的候选目标位置;最后,通过目标位置优化方法得到节点的最佳目标位置,从而完成覆盖优化。仿真结果表明,与基于PSO算法和CS算法等启发式算法的覆盖优化相比,该优化方法能够缩短平均移动距离,提高网络覆盖率,节省节点能量,延长网络生命周期。

关键词：无线传感器网络覆盖空洞萤火虫算法步长因子目标位置优化

The Information Efficiency of QFII's Investment in China's Capital Market

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Contemporary Social Sciences 2021年第2期6卷 129-155页

作者： sun xianchao Zhao Xiaolei Liu Xinran Dong Jianming Sichuan Normal University China Kerry School of Business Arizona State UniversityUS Nankai University China Southwest University of Finance and Economics China

This paper takes stock price synchronization and price delay as indicators of information efficiency, and uses mixed cross-sectional data of listed companies into which Qualified Foreign Institutional Investors(QFII) have made investments, to study the impact of QFII's investment behaviors on the information efficiency of China's stock market. The results show that QFII's investments can improve the information efficiency of China's stock market, but its impact is varied. The impact of QFII's investments on market information efficiency is more significant in bear markets than in bull markets, the impact on private enterprises is more significant than on state-owned enterprises, and the impact on Small and Medium Enterprises(SME) market is more significant than in main board market. Further research also finds that QFII has a certain threshold effect on the information efficiency of China's stock market. This research paper provides a problem-solving perspective for China's capital markets to achieve information efficiency through opening up, and at the same time warns against financial risks.

关键词： Qualified Foreign Institutional Investors stock price synchronization mixed cross-sectional data information efficiency

心电图MVP积分在阵发性心房颤动射频导管消融术后随访中的临床价值

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心电与循环 2024年第2期43卷 136-140页

作者：孙娴超黄玥王志勇孔丽娅胡立群徐文博张晓丽嘉兴市第一医院(嘉兴大学附属医学院)心电科 314000 嘉兴市第一医院(嘉兴大学附属医学院)心血管内科 314000 浙江中医药大学统计教研室

目的探讨心电图P波形态、电压及时间(MVP)积分在阵发性心房颤动(下称房颤)射频导管消融术(下称消融)后随访中的临床价值。方法选择2018年2月至2022年1月嘉兴市第一医院(嘉兴大学附属医院)收治的心房颤动消融患者84例,随访1年,依据房颤... 详细信息

目的探讨心电图P波形态、电压及时间(MVP)积分在阵发性心房颤动(下称房颤)射频导管消融术(下称消融)后随访中的临床价值。方法选择2018年2月至2022年1月嘉兴市第一医院(嘉兴大学附属医院)收治的心房颤动消融患者84例,随访1年,依据房颤是否复发分为未复发组60例、复发组24例。比较两组患者消融前、消融后1年心电图P波参数(MVP)积分、超声心动图检查指标。结果未复发组消融前患者P波时间、MVP积分小于复发组,P波面积大于复发组,未复发组消融后1年患者P波时间、V_(1)P波负向部分振幅和时间的乘积(PtfV_(1))、P波面积、MVP积分小于复发组,差异均有统计学意义(均P<0.05)。复发组消融后1年PtfV_(1)大于消融前,差异有统计学意义(P<0.05)。心电图P波时间、P波面积、MVP积分是房颤消融后房颤复发的影响因素(均P<0.05)。ROC曲线分析发现,MVP积分诊断房颤复发的AUC较大(P=0.001)。未复发组消融前后左心房前后径(LAD)小于复发组,消融后左心室短轴缩短率、左心室射血分数大于复发组,差异均有统计学意义(均P<0.05)。复发组消融前后MVP积分与LAD均呈正相关(r=0.312、0.381,均P<0.05)。结论心电图MVP积分有助于预测房颤消融后复发。

关键词：心房颤动射频导管消融术 P波参数 P波形态、电压及时间积分

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基于改进遗传算法的覆盖空洞修复优化

传感技术学报 2020年第12期33卷 1800-1807页

作者：苟平章孙现超毛刚西北师范大学计算机科学与工程学院甘肃兰州730070

针对无线传感器网络虚拟修复节点位置的不确定性使网络拓扑结构随之变化,导致网络失去连通性的问题,提出一种基于改进遗传算法的覆盖空洞修复优化方法。首先,根据空洞类型采取不同的覆盖策略,确定虚拟修复节点的位置;其次,通过改进遗传... 详细信息

针对无线传感器网络虚拟修复节点位置的不确定性使网络拓扑结构随之变化,导致网络失去连通性的问题,提出一种基于改进遗传算法的覆盖空洞修复优化方法。首先,根据空洞类型采取不同的覆盖策略,确定虚拟修复节点的位置;其次,通过改进遗传算法对待修补节点序列进行编码与适应度函数的构造,对遗传算子进行改进,避免陷入局部最优,求出传输路径的最优解,提升全局寻优能力;最后,根据改进遗传算法找到某空洞内待修补节点之间的一条最短连通路径,该空洞区域内的感测数据在某一时间周期内沿该路径进行传输通信。仿真结果表明,将改进遗传算法应用到覆盖空洞修复中是可行的,网络覆盖率明显提高,具有更好的收敛性。通过算法多次迭代能够找到空洞内各修补节点间的一条最短路径,实现网络连通,节约节点能量,延长了网络生命周期。

关键词：无线传感器网络覆盖空洞修复遗传算法遗传算子最短路径

Copula方法中的边缘分布设定需要计量检验吗?——基于CVaR框架的资产组合视角

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系统科学与数学 2017年第2期37卷 537-552页

作者：潘志远孙显超西南财经大学中国金融研究中心成都611130 西南财经大学金融安全协同创新中心成都611130

Copula理论已经明确了边缘分布需要正确的设定,而在实证应用中,边缘分布的设定检验存在着改进的空间,会使模型风险下降.与以往拆开检验不同,选择最新的统计量同时检验边缘分布的设定,Monte Carlo模拟结果显示同时检验比拆开检验更加稳健... 详细信息

Copula理论已经明确了边缘分布需要正确的设定,而在实证应用中,边缘分布的设定检验存在着改进的空间,会使模型风险下降.与以往拆开检验不同,选择最新的统计量同时检验边缘分布的设定,Monte Carlo模拟结果显示同时检验比拆开检验更加稳健.通过资产组合的实证分析,发现通过检验的边缘分布在样本内获得更高的有效前沿,样本外的测试表明正确的边缘分布设定可以得到更好的投资绩效,显著性检验也支持了该结论.

关键词： Copula方法边缘分布检验 CVaR 资产组合