检索结果-南通市图书馆

Panax notoginseng saponins preconditioning protects rat liver grafts from ischemia/reper- fusion injury via an antiapoptotic pathway

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2005年第2期4卷 207-212页

作者： Yi zhang, Qi-Fa Ye, Li Lu, Xian-Lin Xu, Ying-Zi Ming and Jian-Sheng xiao Wuhan, {2. Institute of Organ Transplantation, Tongji Hospital, Tongji Medical college, Huazhong university of science and Technology, Wuhan 430030, {2. Xiangya Transplantation Medical Academy, Third Xiangya Hospital, Xiangya Medi- cal college, Central South university, changsha 410013, {2. Institute of Organ Transplantation Tongji Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430030 China.

BACKGROUND: Ischemia/reperfusion (I/R) injury is a major cause of primary graft dysfunction and renders an al- lograft more immunogenic in orthotopic liver transplanta- tion (OLT). Panax notoginseng saponins (PNS) has been re- ported to exert protective effects against I/R injury to vari- ous organs. The objective of this study is to investigate whether PNS preconditioning protects rat liver grafts from I/R injury via an antiapoptotic pathway. METHODS: Male Sprague-Dawley rats were used as donors and recipients of orthotopic liver transplantation ( OLT) and were divided into PNS preconditioning group (group P) and normal saline control group (group N) randomly according to whether PNS (50 mg/kg) was injected intra- venously 1 hour before liver grafts harvesting, and sham group (group S). The animals were separately killed 2. 6 and 2. hours after reperfusion. Plasma samples were collect- ed for test of alanine amino-transferase (ALT) and aspartate aminotransferase (AST). Liver tissues were collected to de- tect histological changes, apoptosis and the expression of TNF-α, Bcl-2.and Caspase-3 mRNA. RESULTS: The serum levels of ALT and AST and the apop- tosis index (AI) of liver tissue in group P were lower than in group N significantly 2. 6 and 2. hours after reperfusion. Compared with group N, the expression of TNF-a and Caspase-3 mRNA was reduced significantly in group P 2.and 6 hours after reperfusion and the expression of Bcl-2.mRNA was enhanced significantly in group P 6 and 2. hours after reperfusion. CONCLUSIONS: PNS preconditioning protects liver grafts from I/R injury effectively in rat OLT via an antiapoptotic pathway. The antiapoptotic mechanisms of PNS may in- clude inhibiting the expression of TNF-a and Caspase-3 and enhancing the expression of Bcl-2.

关键词： Panax notoginseng saponins liver transplantation ischemia/reperfusion injury apoptosis

Arbuscular mycorrhizal fungi-mediated resistance to salt spray in Cinnamomum camphora seedlings enhanced by leaf functional traits

在线全文

学校读者我要写书评

暂无评论

Soil Ecology Letters 2024年第3期6卷 163-175页

作者： xiao Li Duo Zheng Naili zhang Lijia Dong Aiping Wu Qiqian Wu Hua Liu Mingshui Zhao Yan Li Xinping Wang Yanhong Wang State Key Laboratory of Subtropical Silviculture Zhejiang A&F UniversityHangzhou 311300China State Key Laboratory of Efficient Production of Forest Resources and the Key Laboratory of Silviculture and Conservation of Ministry of Education Beijing Forestry UniversityBeijing 100083China School of Life and Environmental sciences Shaoxing UniversityShaoxing 312000China Ecology Department College of Environment and EcologyHunan Provincial Key Laboratory of Rural Ecosystem Health in Dongting Lake AreaHunan Agricultural UniversityChangsha 410128China Zhejiang Tianmu Mountain National Nature Reserve Administration Hangzhou 311311China

Salt spray is a natural disturbance in coastal *** mycorrhizal fungi(AMF)are recognized as bio-ameliorators of soil salinity in ***,the mechanism through which AMF protects Cinnamomum camphora against aerial salinity remains *** address this knowledge gap,plants were subjected to four fungal regimes,namely sterilized fungal inoculum,Glomus tortuosum,Funneliformis mosseae,or a combination of these two fungi,and exposed to three sprayed-salt regimes(0,7,or 14 mg NaCl cm−2.d−1)in a *** spray significantly decreased photosynthetic capabilities,total dry weight,and salinity tolerance of non-mycorrhizal *** inoculation,particularly a combination of *** and ***,evidently mitigated the detrimental effects induced by salt ***,mycorrhiza-mediated protection depended on the intensity of sprayed salt and the identity of fungal ***,the enhanced resistance of mycorrhizal *** seedlings to aerial salinity was mainly owing to increased leaf thickness and photosynthetic *** findings imply that inoculation with combined fungi could be an optimal strategy for cultivating *** plants in coastal *** results gained hold the potential to offer both theoretical and practical guidance for the managers of coastal ecosystems in soil restoration and conservation.

关键词： arbuscular mycorrhizal fungi leaf thickness photosynthetic capability salinity-tolerance salt spray

Epitaxial quasi-2./3D hybrid perovskite heterojunctions for photodetector with enhanced detectivity and stability

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第7期17卷 6594-6602页

作者： Yifu Chen Lin zhang Xinxin Peng Weiran Qin Shiqing Li Yingwei Wang Zhihui Chen Si xiao Bin Yang Biao Liu Junliang Yang Han Huang Yun Lin Jun He Liming Ding Yongbo Yuan hunan Key Laboratory of Super Microstructure and Ultrafast Process School of PhysicsCentral South UniversityChangsha 410083China hunan Key Laboratory of Nanophotonics and Devices School of PhysicsCentral South UniversityChangsha 410083China college of Materials science and Engineering Hunan UniversityChangsha 410082China Department of Photoelectric Information School of PhysicsCentral South UniversityChangsha 410083China Center for Excellence in Nanoscience Key Laboratory of Nanosystem and Hierarchical FabricationNational Center for Nanoscience and TechnologyChinese Academy of ScienceBeijing 100190China

Although numerous metal halide perovskite materials have been investigated in the field of optoelectronic,the development of perovskite heterojunctions with exotic structures is still ***,we report the epitaxial growth of quasi-two-dimensional(Q-2.)perovskites on methylammonium lead iodide(MAPbI_(3))single crystals to form perovskite heterojunctions with interfacial *** MAPbI_(3)adjacent to epitaxial Q-2. perovskite shows blue shifted photoluminescence with shortened lifetime,which becomes significant with the reduced layer number of the Q-2. *** findings suggest the presence of an interfacial strain gradient leading to enhanced photocarrier ***,compared to the MAPbI_(3)single crystal detector,the BA_(2.MAPb_(2.I_(7)/MAPbI_(3)(BA:n-butylamine)heterojunction-based photodetector demonstrates a bandpass detecting property and exhibits 5 times enhanced external quantum efficiency and 83 times enhanced specific detectivity(D*=3.2.×10^(11)Jones).Remarkably,the unencapsulated BA_(2.MAPb_(2.I_(7)/MAPbI_(3)heterojunction is stable in ambient condition for>300 *** Q-2./3D heterojunction shows suppressed ion inter-diffusion due to the presence of Q-2. phase.

关键词： epitaxial growth interfacial strain quasi-two-dimensional/three-dimensional(Q-2./3D)heterojunctions ion inter-diffusion

BjuIR:A multi-omics database with various tools for accelerating functional genomics research in Brassica juncea

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Communications 2024年第8期5卷 96-99页

作者： Linna zhang Jinyuan xiao Congyuan Liang Yifan Chen Changchun Yu Xinle Zhao Jiawei Li Mingli Yan Qian Yang Hao Chen Zhongsong Liu Zhengjie Wan Zhiquan Yang Qing-Yong Yang National Key Laboratory for Germplasm Innovation and Utilization of Horticultural Crops College of InformaticsHuazhong Agricultural UniversityWuhan 430070China Hubei Key Laboratory of Agricultural Bioinformatics and Hubei Engineering Technology Research Center of Agricultural Big Data College of InformaticsHuazhong Agricultural UniversityWuhan 430070China National Key Laboratory of Crop Genetic Improvement Hubei Hongshan LaboratoryHuazhong Agricultural UniversityWuhan 430070China Yazhouwan National Laboratory Sanya 572025China National Key Laboratory for Germplasm Innovation and Utilization of Horticultural Crops College of Horticulture and Forestry SciencesHuazhong Agricultural UniversityWuhan 430070China Crop Research Institute Hunan Academy of Agricultural SciencesChangsha 410125China college of Agronomy Hunan Agricultural UniversityChangsha 410128China

Dear Editor,Advances in high-throughput omics technologies,along with methodologies for integrating multi-omics datasets,have substantially enhanced the efficiency of identifying candidate genes in breeding(Gusev et al.,2.1.;Gupta et al.,2.1.).However,this process is often complex and *** address this challenge,databases that integrate extensive data and enable convenient and efficient functional genomics studies are being developed(Ma et al.,2.2.;Yang et al.,2.2.).

关键词： functional integrating convenient

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

供水调度系统的构造

计算机工程与应用 2003年第12期39卷 228-229页

作者：张伟黄炜中南大学铁道学院计算机科学系长沙410075 中国人民解放军航空维修技术学院长沙410124

自来水行业的计算机集成制造技术的实施,目前在我国尚处于刚刚起步阶段。文章就其中的供水调度问题进行了分析,给出了供水调度系统的一般结构。并对其中的几个重要问题进行了讨论。

关键词：计算机集成制造优化调度自来水

Design and Implementation of USB Key System Based on Dual-Factor Identity Authentication Protocol

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Research and Application 2024年第5期8卷 161-167页

作者： Jianxin Wang Zifan Xu Xiangze Chang Chaoen xiao Lei zhang Beijing Electronic science and Technology Institute Beijing 100070China

With the increasing demand for information security,traditional single-factor authentication technology can no longer meet security *** this end,this paper proposes a Universal Serial Bus(USB)Key hardware and software system based on a two-factor authentication protocol,aiming to improve the security and reliability of *** paper first analyzes the current status and technical principles of USB Key-related research domestically and internationally and designs a two-factor authentication protocol that combines impact/response authentication and static password *** system consists of a host computer and a USB Key *** host computer interacts with the USB Key through a graphical user *** Secure Hash Algorithm 1(SHA-1)and MySQL database are used to implement the authentication *** results show that the designed two-factor authentication protocol can effectively prevent replay attacks and information tampering,and improve the security of *** the corresponding USB Key is not inserted,the system will prompt that the device is not *** the USB Key is inserted,user identity is confirmed through two-factor verification,which includes impact/response authentication and static password authentication.

关键词： Information security USB Key Impact/response authentication Static password authentication

Technical analysis of 3DTV and outstanding issues

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Shanghai university(English Edition) 2011年第4期15卷 316-320页

作者：张兆杨程浩沈礼权杨高波 Key Laboratory of Advanced Display and System Application (Shanghai university) Ministry of Education college of computer and Communication Hunan University

This paper analyzes the technical characteristic of three-dimensional display technology （3DTV） system and some core technologies yet to be solved. It points out the ways to solve these problems and presents an effe... 详细信息

关键词： three-dimensional (3D) display multi-view/depth coding inter-view rendering discomfort of watching threedimensional display technology (3DTV)

在线全文

学校读者我要写书评

暂无评论

基于信息熵的IP网端到端行为分析与建模

计算机工程与应用 2004年第18期40卷 15-18,28页

作者：张连明陈志刚湖南师范大学物理与信息科学学院中南大学信息科学与工程学院长沙410083 中南大学信息科学与工程学院

具有开放、分布式、不协作、异构、无中心控制等特点的Internet复杂巨系统的管理、容量规划、新一代网络体系结构设计与分析和性能预测都离不开对网络行为的充分理解。而端到端行为作为网络行为的一个重要组成部分,具有一定的研究价值... 详细信息

具有开放、分布式、不协作、异构、无中心控制等特点的Internet复杂巨系统的管理、容量规划、新一代网络体系结构设计与分析和性能预测都离不开对网络行为的充分理解。而端到端行为作为网络行为的一个重要组成部分,具有一定的研究价值。该文利用信息熵原理建立用于分析端到端整体宏观行为的信息熵模型,该模型能很好地反映端到端整体宏观行为与链路上各节点的状态概率之间关系,根据该模型可以分析端到端链路上各节点之间的相互作用关系以及它们是如何引起端到端整体宏观行为的。最后,给出了该模型的有效性和稳定性定量分析的判别式。

关键词：网络宏观行为端到端行为信息熵状态概率

基于Markov Chain的协议异常检测模型

在线全文

学校读者我要写书评

暂无评论

计算机科学 2004年第10期31卷 66-68,95页

作者：李娜秦拯张大方陈蜀宇湖南大学计算机与通讯学院长沙410082 重庆大学计算机学院重庆400044

本文介绍了基于Markov链的协议异常检测模型,此外,通过对MIT Lincoln实验室1999评估数据的分析,证明此模型的正确性和有效性。

关键词：异常检测模型协议正确性数据 Markov链 MIT 证明实验室有效性