检索结果-南通市图书馆

Differences in leaf functional traits between exotic and native Compositae plant species

Journal of Central South University 2017年第10期24卷 2468-2474页

作者： WANG Cong-yan LIU Jun zhou jia-wei XIAO Hong-guang School of the Environment and Safety Engineering Jiangsu University State Key Laboratory of Soil and Sustainable Agriculture (Institute of Soil Science Chinese Academy of Sciences)

This study aims to determine the differences in leaf functional traits and phenotypic plasticity of leaf functional traits between exotic and native Compositae plant species. Leaf width of exotic plants was significantly lower than that of native species. Leaf length, specific leaf area(SLA), single-leaf wet and dry weights, leaf moisture, and leaf thickness of exotic plants were also lower than those of native species but not significantly. The leaf shape index of exotic plants was higher than that of native species but not significantly. This implies that the relatively low leaf construction cost for exotic plants may play an important role in the success of their invasions. The higher leaf shape index and lower leaf width of exotic plants can enhance the efficiency of resource capture(especially sunlight capture) via adjustments to leaf shape and size, thereby increasing the survival of exotic plants. The plasticity indices of single-leaf wet weight and leaf thickness of exotic plants were significantly lower than those of native species. The lower phenotypic plasticity of single-leaf wet weight and leaf thickness of exotic plants may be the result of a cost to plasticity. That is, if the plasticity is too high, the fitness of plant species might be reduced sharply under unfavorable environments. Thus, lower plasticity of leaf functional traits may compensate for the negative impact of adverse environments and stabilize leaf construction costs for exotic plants. Moreover, reduced phenotypic plasticity might be one of the key competitive strategies by which exotic plants successfully invade new habitats. Overall, exotic plants did not always exhibit higher values of leaf functional traits or increased phenotypic plasticity of leaf functional traits compared with native species.

关键词： leaf functional traits specific leaf area (SLA) phenotypic plasticity exotic plants Compositae

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparative proteomic analysis of differentially expressed proteins in human pancreatic cancer tissue

引用

Hepatobiliary & Pancreatic Diseases International 2009年第2期8卷 193-200页

作者： Chen, jian-Hua Ni, Run-zhou Xiao, Ming-Bing Guo, Ji-Guang zhou, jia-wei Nantong Univ Affiliated Hosp Dept Gastroenterol Nantong 226001 Peoples R China Chinese Acad Sci Shanghai Inst Biol Sci Inst Neurosci Shanghai 200030 Peoples R China

BACKGROUND: Pancreatic cancer is one of the most common malignant tumors. Early diagnosis of pancreatic cancer is difficult because of the latent onset and lack of good biomarkers. This study aimed to look for and identify differentially expressed proteins in tissues of pancreatic cancer and adjacent noncancerous tissues by proteomic approaches so as to provide information about possible pancreatic cancer markers and therapeutic targets. METHODS: Proteins extracted front 3 paired adjacent noncancerous and cancerous pancreatic tissue specimens were separated by two-dimensional gel electrophoresis (2-DE). The protein spots exhibiting statistical alternations between the two groups through computerized image analysis were then identified by matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS). In addition, Western blotting and immunohistochemistry were performed to verify the expression of certain candidate proteins. RESULTS: Twelve proteins were significantly upregulated and 4 were downregulated between cancerous and paired adjacent noncancerous pancreatic tissues. Several proteins (S100A11, Ig gamma-l chain C region, GSTO1 and peroxiredoxin 4) were found for the first time to be associated with pancreatic cancer. Differential expression of some identified proteins was further confirmed by Western blotting analysis and/or immunohistochemical analysis. CONCLUSIONS: Comparative proteomic analysis using 2-DE and MALDI-TOF-MS is an effective method for identifying differentially expressed proteins that may be the potential diagnostic biomarkers and therapeutic targets for pancreatic cancer.

关键词： electrophoresis, gel, two-dimensional pancreatic neoplasms proteomics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Identification of a cytochrome P450 from Tripterygium hypoglaucum(Levl.)Hutch that catalyzes polpunonic acid formation in celastrol biosynthesis

引用

Chinese Journal of Natural Medicines 2022年第9期20卷 691-700页

作者： CHEN Xiao-Chao LU Yun LIU Yuan zhou jia-wei ZHANG Yi-Feng GAO Hai-Yun LIDan GAO wei School of Traditional Chinese Medicine Capital Medical UniversityBeijing 100069China Beijing Shijitan Hospital Capital Medical UniversityBeijing 100038China

Tripterygium hypoglaucum(Levl.)Hutch,a traditional Chinese medicinal herb with a long history of use,is widely distributed in *** of its main active components,celastrol,has great potential to be developed into anti-cancer and anti-obesity *** it exhibits strong pharmacological activities,there is a lack of sustainable sources of celastrol and its derivatives,making it crucial to develop novel sources of these drugs through synthetic *** key step in the biosynthesis of celastrol is considered to be the cyclization of 2,3-oxidosqualene into friedelin under the catalysis of 2,3-oxidosqualene *** was speculated to be oxidized into celastrol by cytochrome P450 oxidases(CYP450s).Here,we reported a cytochrome P450 ThCYP712K1 from Tripterygium hypoglaucum(Levl.)Hutch that catalyzed the oxidation of friedelin into polpuonic acid when heterologously expressed in *** substrate supplementation and in vitro enzyme analysis,ThCYP712K1 was further proven to catalyze the oxidation of friedelin at the C-29 position to produce polpunonic acid,which is considered a vital step in the biosynthesis of celastrol,and will lay a foundation for further analysis of its biosynthetic pathway.

关键词： Tripterygium hypoglaucum Cytochrome P450 Polpunonic acid Celastrol Biosynthesis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Dry matter production and panicle characteristics of high yield and good taste indica hybrid rice varieties

引用

Journal of Integrative Agriculture 2023年第5期22卷 1338-1350页

作者： LI Min ZHU Da-wei jiaNG Ming-jin LUO De-qiang jiaNG Xue-hai JI Guang-mei LI Li-jiang zhou wei-jia Rice Research Institute Guizhou Academy of Agricultural SciencesGuiyang 550006P.R.China Rice Product Quality Supervision and Inspection Center Ministry of Agriculture and Rural AffairsChina National Rice Research InstituteHangzhou 310006P.R.China

Indica hybrid rice(Oryza sativa) production aims to achieve two crucial targets: high yield and good taste. This study selected three types of indica hybrid rice according to grain yield and taste value, including high yield and good taste(HYGT), low yield and good taste(LYGT), and high yield and poor taste(HYPT), to analyze yield components,corresponding growth characteristics, and rice taste quality. When values were averaged across varieties and years,there were almost no differences in taste value between HYGT and LYGT;HYGT showed a significant increase in yield,owing to a higher number of panicles and spikelets per panicle, with a respective increment of 16.2 and 20.6%. The higher grain yield of HYGT compared with LYGT was attributed to three key factors: a higher leaf area index(LAI) during heading, a higher ratio of grain to leaf, and a higher biomass accumulation at maturity. HYGT and HYPT achieved similar high yields;however, HYGT had more panicle numbers and lower grain weight. In addition, HYGT showed a significantly higher taste value than HYPT, attributed to its significantly lower protein and amylose contents, with reductions of 8.8and 15.7%, respectively. Lower protein and amylose contents might be caused by a proper matter translocation from vegetative organs to panicle. This study suggested that reasonable panicle characteristics and translocation efficiency from vegetative organs to panicle during heading to maturity are the key factors in balancing yield and rice taste *** results will provide valuable insights for rice breeders to improve the grain yield and quality of indica hybrid rice.

关键词： indica hybrid rice grain yield taste quality growth characteristics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

铜改性生物质基分级多孔炭及其电容性能

引用

新型炭材料 2022年第2期37卷 412-423页

作者：胡家荣周佳伟贾雨欣李爽西北大学化工学院陕西西安710069

多孔炭由于其较长的循环寿命和前驱体种类繁多而被广泛应用于超级电容器中,但其电容量较低,导致能量密度较低。本文通过简单、高效的炭化和活化方法合成了铜修饰的生物质衍生的分级多孔炭(Cu-AC-x),混合价态(CuO、Cu_(2)O、Cu^(0))的铜... 详细信息

多孔炭由于其较长的循环寿命和前驱体种类繁多而被广泛应用于超级电容器中,但其电容量较低,导致能量密度较低。本文通过简单、高效的炭化和活化方法合成了铜修饰的生物质衍生的分级多孔炭(Cu-AC-x),混合价态(CuO、Cu_(2)O、Cu^(0))的铜纳米颗粒均匀分散在其表面。作为超级电容器电极材料,由于分级孔结构提供的快速电子/离子转移途径,以及Cu混合价态之间的加速氧化还原反应,Cu-AC-x纳米复合材料表现出良好的电化学性能。在三电极体系中,CuAC-2在0.5 A g^(-1)下表现出360 F g^(-1)的高比电容,是AC(163 F g^(-1))的1.21倍。此外,当将其组装对称电容器时,该器件在0.5 A g^(-1)下的比电容为143.44 F g^(-1),经6000次循环后的循环稳定性为81.8%。

关键词：生物质铜分级多孔炭电极超级电容器

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Variability of leaf functional traits of invasive tree Rhus typhina L. in North China

引用

Journal of Central South University 2020年第1期27卷 155-163页

作者： wei Mei WANG Shu WU Bing-de jiaNG Kun zhou jia-wei WANG Cong-yan Institute of Environment and Ecology Academy of Environmental Health and Ecological Security&School of the Environment and Safety EngineeringJiangsu UniversityZhenjiang 212013China School of the Environment Nanjing UniversityNanjing 210023China State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China

Functional traits, specifically leaf functional traits, are core-topics to explore importance to the invasion success of invasive plant species. This study aims to address the differences in leaf functional traits and their corresponding variability of the invasive tree staghorn sumac Rhus typhina L. with different invasion success, including lower and higher invasion success, in two climatic regions in North China, including a warm temperate region and a cold temperate region. No significant differences were found for leaf functional traits of staghorn sumac across different invasion success. However, the variability of leaf chlorophyll and nitrogen concentrations of staghorn sumac under higher invasion success were approximately 66.023% and 68.615% higher than those under lower invasion success, respectively. The leaf chlorophyll and nitrogen concentrations of staghorn sumac in the warm temperate region were approximately 18.432% and 16.337% higher than those in cold temperate region, respectively. The variability of specific leaf area of staghorn sumac in warm temperate region was approximately 59.802% higher than that in cold temperate region. Accordingly, leaf chlorophyll and N concentrations as well as specific leaf area of staghorn sumac and their corresponding variability may play an essential role in shaping ecological success of studied invader along a climatic gradient.

关键词： climatic region invasive tree coefficient of variation variability specific leaf area Rhus typhina L.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Differences in functional traits and reproductive allocations between native and invasive plants

引用

Journal of Central South University 2018年第3期25卷 516-525页

作者： WANG Cong-yan zhou jia-wei LIU Jun XIAO Hong-guang WANG Lei Institute of Environment and Ecology Academy of Environmental Health and Ecological Security & School of the Environment and Safety Engineering Jiangsu University

Because co-occurring native and invasive plants are subjected to similar environmental selection pressures,the differences in functional traits and reproductive allocation strategies between native and invasive plants may be closely related to the success of the ***,this study examines differences in functional traits and reproductive allocation strategies between native and invasive plants in Eastern *** height,branch number,reproductive branch number,the belowground-to-aboveground biomass ratio,and the reproductive allocation coefficient of invasive plants were all notably higher than those of native ***,the specific leaf area(SLA)values of invasive plants were remarkably lower than those of native *** indexes of SLA,maximum branch angle,and branch number of invasive plants were each notably lower than those of native *** reproductive allocation coefficient was positively correlated with reproductive branch number and the belowground-to-aboveground biomass ratio but exhibited negative correlations with SLA and aboveground *** height,branch number,reproductive branch number,the belowground-to-aboveground biomass ratio,and the reproductive allocation coefficient of invasive plants may strongly influence the success of their invasions.

关键词： functional trait specific leaf area reproductive allocation strategy phenotypic plasticity invasive plant

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于扩展LLE方法的非线性系统故障诊断研究

引用

电子学报 2015年第9期43卷 1810-1815页

作者：张伟周维佳刘晓源中国科学院沈阳自动化研究所机器人学国家重点实验室辽宁沈阳110016

针对非线性系统故障诊断难以解决的问题,提出了一种基于扩展局部线性嵌入映射(Locally Linear Embedding,LLE)的故障诊断方法.通过引入切空间距离代替欧氏距离,可以更加科学的满足算法近邻点局部线性的要求,从而可以更好的保留原始数据... 详细信息

针对非线性系统故障诊断难以解决的问题,提出了一种基于扩展局部线性嵌入映射(Locally Linear Embedding,LLE)的故障诊断方法.通过引入切空间距离代替欧氏距离,可以更加科学的满足算法近邻点局部线性的要求,从而可以更好的保留原始数据的局部流形特征.另外,将故障状态与高维空间分布结合起来,通过确定数据点在空间超球内的分布完成故障的检测,在这个过程中将超球的确定与LLE算法中基于核函数的样本外数据扩展相结合,减少了计算量,提高了算法的实时性,从而为复杂非线性系统的故障诊断提供了一种新的有效的方法.

关键词：故障诊断局部线性嵌入映射切空间距离

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

煤块冲击破碎粒度分形特征

引用

振动与冲击 2013年第3期32卷 18-21,28页

作者：刘瑜周甲伟杜长龙河南理工大学机械与动力工程学院河南焦作454000 中国矿业大学机电工程学院江苏徐州221116

煤块冲击破碎后粒度分布具有分形特征,据分形理论建立煤块冲击破碎粒度分形模型,对不同矿区煤块进行冲击破碎试验。在不同试验条件下对破碎煤块筛下质量累积概率进行函数拟合,结果表明:分形模型能很好地描述煤块冲击破碎后的粒度分布特... 详细信息

煤块冲击破碎后粒度分布具有分形特征,据分形理论建立煤块冲击破碎粒度分形模型,对不同矿区煤块进行冲击破碎试验。在不同试验条件下对破碎煤块筛下质量累积概率进行函数拟合,结果表明:分形模型能很好地描述煤块冲击破碎后的粒度分布特征,粒度分形维数能评价煤块冲击破碎效果。采用Matlab软件建立粒度分形维数与试验参数间二次方模型,该模型预测结果与试验结果平均误差为2.51%,可满足预测误差要求,为控制煤块冲击破碎后产品粒度分布提供理论依据。

关键词：煤块冲击破碎粒度分形维数试验

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Physical Layer Security Scheme With AoI-Awareness for Industrial IoT Based on Covert Communications

引用

IEEE/CAA Journal of Automatica Sinica 2025年第1期 276-278页

作者： Yaping Li Zhi-Xin Liu jia-wei Su Ya-zhou Yuan the Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan University

Dear Editor,Industrial Internet of things(IIoT) is a typical application of cyberphysical system(CPS). In the IIoT, wireless communication is an inevitable trend to replace the deployment-limited wired transmission for cases with large-scale and mobile devices. However, wireless communication gives rise to critical issues related to physical security, such as malicious detections and attacks [1].

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：