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THE GENETIC DIVERSITY OF GAOZHOU WILD RICE ANALYZED BY SSR

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Chinese Science Bulletin 2006年第5期51卷 562-572页

作者： li Chen PAN Dajian MAO Xingxue TU Congyong ZHOU hanqin FAN Zhilan li Xiaofang Rice Research Institute of Guangdong Academy of Agricultural Sciences Key Laboratory of Ministry of Agriculture Guangzhou 510640 China

The genetic diversity of total 240 acces- sions of common wild rice coming from Gaozhou, Shaoguan, Zhanjiang, and other places in Guang- dong, and Jiangxi, Fujian, Yunnan provinces, etc. in China and South-eastern Asia was evaluated by us- ing 24 pairs of SSR primers. The results indicated that: (i) there were 17 polymorphic loci in 24 pairs of SSR primers, and the average percentage of poly- morphic loci was 69%; the average total number of alleles, the average number of alleles per locus and the average number of alleles per polymorphic loci were 51.1, 2.04 and 2.43, respectively; (ii) the aver- age gene diversity was 0.8447. There were remark- able differentiations among 5 populations of Gaozhou wild rice. All the above-mentioned genetic parame- ters indicated that Gaozhou wild rice of Pengshan Village (or Bei Toudong) of Zhenjiang Town should be a center of genetic differentiation and diversity of Gaozhou wild rice. Gaozhou wild rice is probably the largest center of genetic differentiation and diversity of common wild rice from Guangdong Province, South China and even the whole China.

关键词：野生稻遗传多样性 SSR标记遗传育种广东

MicroRNA-23-27 clusters alleviate neuronal apoptosis though targeting Apaf-1 protein

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MicroRNA-23-27 clusters alleviate neuronal apoptosis though ...

Global convergence in terrestrial gross primary production response to atmospheric vapor pressure deficit

中国神经科学学会第十届全国学术会议

作者： Qun Chen Jie Xu hanqin li liang li Susu Mao Ke Zen Chen-Yu Zhang Qipeng Zhang Jiangsu Engineering Research Center for microRNA Biology and Biotechnology State Key Laboratory of Pharmaceutical BiotechnologySchool of Life SciencesNanjing University

Apoptotic protease activating factor-1（Apaf1） is a key apoptotic protein and plays a critical role in the regulation of neuronal apoptosis.Expression of Apaf1 is gradually decreased during the central nervous system development,which responsible to the decreased caspase activity.However,the mechanism of decreased expression of Apaf1 in mouse cortex during development remains elusive.In present study,we found that four microRNAs encoded by miR-23a-27a cluster and miR-23b-27b cluster participated in the regulation of Apaf1 expression.Luciferase assay and western blotting assay revealed that these four microRNAs suppressed the expression of Apaf1 in vitro.Furthermore,the expression miR-23-27 clusters in mouse cortex are gradually increased,showed a reversed-correlated pattern to the Apaf1 expression pattern.Hypoxic injury,the most commonly cause of neurological damages in fetus during the perinatal period,could cause neuronal apoptosis.We examined whether miR-23-27 cluster could attenuate the susceptibility of fetal brain.In primary neurons,miR-23-27 clusters inhibited the apoptosis induced by hypoxia in vitro;in neuronal specific transgenic mice,over-expression miR-23b-27b cluster inhibited the neuronal apoptosis induced by intrauterine hypoxia in vivo.Taken together,our results indicate that miR-23-27 clusters are the endogenous inhibitory factors of Apaf1 expression;increased expression of miR-23-27 clusters may control the sensitivity of neurons to apoptosis.For the first time,we discovered that microRNAs play roles in the neuronal apoptosis during development.This study implied that microRNAs might be a potential target to treat the neuronal apoptosis diseases.

关键词： Apafl apoptosis neuron microRNA hypoxia

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Science China life Sciences 2024年

作者： Chao Huang Jingfeng Huang Jingfeng Xiao Xing li Hong S.He Yu liang Fusheng Chen hanqin Tian Key Laboratory of National Forestry and Grassland Administration on Forest Ecosystem Protection and Restoration of Poyang Lake Watershed College of Forestry Jiangxi Agricultural University CAS Key Laboratory of Forest Ecology and Management Institute of Applied Ecology Chinese Academy of Sciences Institute of Applied Remote Sensing & Information Technology College of Environmental and Resource Sciences Zhejiang University Key Laboratory of Agricultural Remote Sensing and Information Systems Zhejiang Province Zhejiang University Earth Systems Research Center Institute for the Study of Earth Oceans and Space University of New HampshireDurham Research Institute of Agriculture and life Sciences Seoul National University School of Natural Resources University of Missouri 203 ABNR BuildingColumbia Schiller Institute for Integrated Science and Society Department of Earth and Environmental Sciences Boston College

Atmospheric vapor pressure deficit(VPD) increases with climate warming and may limit plant growth. However, gross primary production(GPP) responses to VPD remain a mystery, offering a significant source of uncertainty in the estimation of global terrestrial ecosystems carbon dynamics. In this study, in-situ measurements, satellite-derived data, and Earth System Models(ESMs) simulations were analysed to show that the GPP of most ecosystems has a similar threshold in response to VPD: first increasing and then declining. When VPD exceeds these thresholds, atmospheric drought stress reduces soil moisture and stomatal conductance, thereby decreasing the productivity of terrestrial ecosystems. Current ESMs underscore CO2fertilization effects but predict significant GPP decline in low-latitude ecosystems when VPD exceeds the thresholds. These results emphasize the impacts of climate warming on VPD and propose limitations to future ecosystems productivity caused by increased atmospheric water demand. Incorporating VPD, soil moisture, and canopy conductance interactions into ESMs enhances the prediction of terrestrial ecosystem responses to climate change.

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基于新闻大数据的北极地区地缘关系研究

Journal of Geographical Sciences 2022年第10期32卷 2036-2052页

作者：李萌袁文袁武牛方曲李汉青胡段牧 Institute of Geographic Sciences and Natural Resources Research CASBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China School of Computer Science&Technology BITBeijing 100081China First Research Institute of the Ministry of Public Security of PRC Beijing 100048China

Global warming has caused the Arctic Ocean ice cover to shrink.This endangers the environment but has made traversing the Arctic channel possible.Therefore,the strategic position of the Arctic has been significantly improved.As a near-Arctic country,China has formulated relevant policies that will be directly impacted by changes in the international relations between the eight Arctic countries(regions).A comprehensive and real-time analysis of the various characteristics of the Arctic geographical relationship is required in China,which helps formulate political,economic,and diplomatic countermeasures.Massive global real-time open databases provide news data from major media in various countries.This makes it possible to monitor geographical relationships in real-time.This paper explores key elements of the social development of eight Arctic countries(regions)over 2013-2019 based on the GDELT database and the method of labeled latent Dirichlet allocation.This paper also constructs the national interaction network and identifies the evolution pattern for the relationships between Arctic countries(regions).The following conclusions are drawn.(1)Arctic news hotspot is now focusing on climate change/ice cap melting which is becoming the main driving factor for changes in geographical relationships in the Arctic.(2)There is a strong correlation between the number of news pieces about ice cap melting and the sea ice area.(3)With the melting of the ice caps,the social,economic,and military activities in the Arctic have been booming,and the competition for dominance is becoming increasingly fierce.In general,there is a pattern of domination by Russia and Canada.

关键词： Arctic geographical relationship spatiotemporal data mining topic model interactive network big data

集体共识、知识生产与分众对话:全球话语竞争背景下的中国对外传播话语体系建构新思路

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中国新闻传播研究 2023年第3期 3-13页

作者：周庆安李涵沁清华大学新闻传播学院清华大学新闻与传播学院

百年变局之中,媒介技术的发展不断推动全球传播秩序与交互模式的变化,围绕国际话语权展开的博弈与竞争日益激烈。与此同时,话语安全化趋势进一步深化了当下的不确定性与不稳定性,世界陷入新型安全与对话困局。对此,中国应围绕“新概念... 详细信息

百年变局之中,媒介技术的发展不断推动全球传播秩序与交互模式的变化,围绕国际话语权展开的博弈与竞争日益激烈。与此同时,话语安全化趋势进一步深化了当下的不确定性与不稳定性,世界陷入新型安全与对话困局。对此,中国应围绕“新概念、新范畴、新表述”三个核心维度,以回归集体共识、重视知识生产、分众精细对话为策略导向,创新与再构自身对外传播话语体系,准确、高效传递中国理念,实现全球共识的引导塑造,为人类命运共同体的形成奠定观念基础。

关键词：对外传播话语体系安全化塑造共识传播效能

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军事通用基础课程虚拟教研室建设研究

科教导刊 2023年第15期 39-41页

作者：周浩毛超李瀚钦海军工程大学作战运筹与规划系湖北武汉430033

推进现代信息技术与教育教学的深度融合是我国高校教学改革和创新的基本方向,虚拟教研室是信息化时代新型基层教学组织建设的重要探索,为跨院校、跨地域的课程建设、资源共享、教学研究等工作搭建起新型的交流平台。文章总结了军事通用... 详细信息

推进现代信息技术与教育教学的深度融合是我国高校教学改革和创新的基本方向,虚拟教研室是信息化时代新型基层教学组织建设的重要探索,为跨院校、跨地域的课程建设、资源共享、教学研究等工作搭建起新型的交流平台。文章总结了军事通用基础课程教学面临的困境,分析了军事通用基础课程虚拟教研室建设的现实价值,围绕虚拟教研室建设的重点内容,规划了军事通用基础课程虚拟教研室的建设路径,为军队院校提高军事通用基础课程教学质量、探索虚拟教研室的建设与发展提供了理论指导。

关键词：虚拟教研室军事通用基础课程军队院校

结构加固用干混自密实混凝土的制备与强度试验

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水泥工程 2023年第4期 91-94页

作者：陈皓吴霞李汉钦江西省建材产品质量监督检验站有限公司江西南昌330001 南昌工学院江西南昌330108

本文选取不同的水料比和粗骨料含量,制定了8种制备干混自密实混凝土的配比方案。根据不同方案制备的干混自密实混凝土拌合物的坍落扩展度、T500扩展时间,选取满足自密实混凝土工作性能的配比进行抗压强度、抗折强度、劈裂抗拉强度和钢... 详细信息

本文选取不同的水料比和粗骨料含量,制定了8种制备干混自密实混凝土的配比方案。根据不同方案制备的干混自密实混凝土拌合物的坍落扩展度、T500扩展时间,选取满足自密实混凝土工作性能的配比进行抗压强度、抗折强度、劈裂抗拉强度和钢筋握裹强度试验。试验结果表明,当水料比取1.3,粗骨料含量取30%和35%时,制备的干混自密实混凝土同时具备良好的工作性能和力学性能,可应用于结构加固。

关键词：结构加固干混自密实混凝土强度工作性能

政党引领国家治理研究的热点议题与前沿趋势——基于CSSCI期刊论文的计量分析

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广州社会主义学院学报 2023年第1期 83-89页

作者：李汉卿孟子龙华东政法大学政府管理学院北京航空航天大学人文社会科学学院

自中共十八届三中全会提出国家治理体系与治理能力现代化发展目标以来,政党引领国家治理已成为当前中国政治学研究的重要议题,揭示政党引领国家治理研究领域的热点内容和前沿知识,可为今后政党中心的国家治理理论推进及政策完善提供启... 详细信息

自中共十八届三中全会提出国家治理体系与治理能力现代化发展目标以来,政党引领国家治理已成为当前中国政治学研究的重要议题,揭示政党引领国家治理研究领域的热点内容和前沿知识,可为今后政党中心的国家治理理论推进及政策完善提供启示与参考。以CSSCI数据库收录的296篇文献为基础,采用文献计量分析和关键词共现分析方法对政党引领国家治理研究的年代演进、热点聚类和前沿知识等进行深入分析。学界对政党引领国家治理领域的研究重视程度逐渐增加,研究热点主要形成了中国式国家治理现代化、中国特色社会主义制度优势、人民民主、全面从严治党、政党中心主义以及党和国家监督体系等六个方面。基于本土经验的政党中心主义将逐步成为该领域的核心议题,需要在理论范畴的中国化以及对话西方治理话语的基础上持续深入。

关键词：政党中心主义国家治理政党治理

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基于新闻大数据的北极地区地缘关系研究

地理学报 2021年第5期76卷 1090-1104页

作者：李萌袁文袁武牛方曲李汉青胡段牧中国科学院地理科学与资源研究所北京100101 中国科学院大学北京100049 北京理工大学计算机学院北京100081 公安部第一研究所北京100048

随着全球气候变暖,北极地区海冰大面积消融,引发了严重环境问题,同时使得北极航道成为可能,北极地区的战略地位显著提升。作为近北极国家,北极地区国际关系变化对中国的北极政策有直接影响。全面实时地分析北极地区地缘关系及其变化特征... 详细信息

随着全球气候变暖,北极地区海冰大面积消融,引发了严重环境问题,同时使得北极航道成为可能,北极地区的战略地位显著提升。作为近北极国家,北极地区国际关系变化对中国的北极政策有直接影响。全面实时地分析北极地区地缘关系及其变化特征,对中国制定北极地区的政治、经济、外交政策具有重要指导作用。海量全球实时开放数据库的出现以及大数据技术的发展,如GDELT新闻事件数据库提供了覆盖全世界的源于各国主要媒体服务平台的新闻数据,为地缘关系实时监控及分析提供了可能性。本文利用GDELT数据库,引入labeledLDA主题分析的理论与方法,挖掘了2013—2019年北极圈内8个国家和地区社会发展关键要素,构建了国家(地区)交互网络,发现了北极地区国家(地区)之间关系的演变格局。主要结论为:(1)北极地区热点新闻主题聚焦于气候变化/冰盖融化,冰盖融化是北极地缘关系变化的主要驱动因子;(2)冰盖融化新闻热度与海冰监测数据变化存在极强的相关性;(3)随着冰盖融化,北极地区的社会经济军事活动激增,其主导权的争夺日趋激烈,总体呈现出俄罗斯、加拿大主导的格局。

关键词：北极地区地缘关系时空数据挖掘主题模型交互网络大数据