检索结果-南通市图书馆

Community structure and elevational diversity patterns of soil Acidobacteria

Journal of Environmental Sciences 2014年第8期26卷 1717-1724页

作者： Yuguang Zhang Jing Cong Hui Lu guangliang li Yuanyuan Qu Xiujiang Su Jizhong Zhou Diqiang li Institute of Forestry Ecology Environment and ProtectionKey Laboratory of Forest Ecology and Environment of State Forestry AdministrationChinese Academy of Forestry School of Mineral Processing and Bioengineering Central South University Institute for Environmental Genomics Department of Botany and MicrobiologyUniversity of Oklahoma Hunan Baiyunshan National Nature Reserve

Acidobacteria is one of the most dominant and abundant phyla in soil,and was believed to have a wide range of metabolic and genetic functions. Relatively little is known about its community structure and elevational diversity patterns. We selected four elevation gradients from 1000 to 2800 m with typical vegetation types of the northern slope of Shennongjia Mountain in central China. The vegetation types were evergreen broadleaved forest,deciduous broadleaved forest,coniferous forest and sub-alpine shrubs. We analyzed the soil acidobacterial community composition,elevational patterns and the relationship between Acidobacteria subdivisions and soil enzyme activities by using the 16 S rRNA meta-sequencing technique and multivariate statistical analysis. The result found that 19 known subdivisions as well as an unclassified phylotype were presented in these forest sites,and Subdivision 6 has the highest number of detectable operational taxonomic units（OTUs）. A significant single peak distribution pattern（P 〈 0.05） between the OTU number and the elevation was observed. The Jaccard and Bray–Curtis index analysis showed that the soil Acidobacteria compositional similarity significantly decreased（P 〈 0.01） with the increase in elevation distance. Mantel test analysis showed the most of the soil Acidobacteria subdivisions had the significant relationship（P 〈 0.01） with different soil enzymes. Therefore,soil Acidobacteria may be involved in different ecosystem functions in global elemental cycles. Partial Mantel tests and CCA analysis showed that soil pH,soil temperature and plant diversity may be the key factors in shaping the soil Acidobacterial community structure.

关键词： Elevational pattern Potential metabolic activity Acidobacterial subdivision Soil pH Driving factor Environmental change

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 spring precipitation over southern China associated with multiyear La Ni?a events

引用

Acta Oceanologica Sinica 2024年第2期43卷 1-10页

作者： guangliang li licheng Feng Wei Zhuang Fei liu Ronghua Zhang Cuijuan Sui National Marine Environmental Forecasting Center Ministry of Natural ResourcesBeijing 100081China State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen 361102China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China Key Laboratory of Tropical Atmosphere-Ocean System of Ministry of Education/School of Atmospheric Sciences Sun Yat-Sen UniversityZhuhai 519082China School of Marine Sciences Nanjing University of Information Science and TechnologyNanjing 210044China

Composite analyses were performed in this study to reveal the difference in spring precipitation over southern China during multiyear La Ni?a events during 1901 to 2015. It was found that there is significantly below-normal precipitation during the first boreal spring, but above-normal precipitation during the second year. The difference in spring precipitation over southern China is correlative to the variation in western North Pacific anomalous cyclone(WNPC), which can in turn be attributed to the different sea surface temperature anomaly(SSTA) over the Tropical Pacific. The remote forcing of negative SSTA in the equatorial central and eastern Pacific and the local air-sea interaction in the western North Pacific are the usual causes of WNPC formation and *** in the first spring is stronger than those in the second spring. As a result, the intensity of WNPC in the first year is stronger, which is more likely to reduce the moisture in southern China by changing the moisture transport, leading to prolonged precipitation deficits over southern China. However, the tropical SSTA signals in the second year are too weak to induce the formation and maintenance of WNPC and the below-normal precipitation over southern China. Thus, the variation in tropical SSTA signals between two consecutive springs during multiyear La Ni?a events leads to obvious differences in the spatial pattern of precipitation anomaly in southern China by causing the different WNPC response.

关键词： multiyear La Nina precipitation anomaly anomalous western North Pacific cyclone southern China

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

VULCANIZATION KINETICS OF SIliCONE RUBBER

引用

Chinese Journal of Polymer Science 1988年第4期6卷 353-358页

作者：袁强李玉福李光亮 Institute of Chemistry Academia Sinica Academia Sinica Beijing

Vulcanization rate of silicone rubber with the aid of organic peroxide or hydrosilylation agent was studied by using oscillation disk rheometer. It was found that the process of network formation would take place through one, two or three steps depending on the structure of the reactants. The effect of phenyl group, vinyl terminals on polysiloxane chain and the functionality of silylation agent was also studied.

关键词： Silicone rubber Vulcanization Kinetics Hydrosilylation.

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

SCANNING ELECTRON MICROSCOPY STUDY OF FILLED SIliCONE RUBBER

引用

Chinese Journal of Polymer Science 1988年第3期6卷 230-235页

作者：李玉福杨啓云李光亮 Institute of Chemistry Academia Sinica Beijing

The fracture surfaces of a number of silicone vulcanizates were investigated by the use of scanning electron microscopy (SEM). It was found that the difference in the presence and absence of filler, the variation of its surface modification as well as the history of thermal aging of the vulcanizates, all of these factors made difference in surface morphology of the fractured surface. This was correlated with the strength of the vulcanizates. The reinforcing effect of filler and the process of fracture were discussed.

关键词： Scanning electron microscopy Silicone rubber Filler effect Silica Fracture of polymer.

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

Study on Habitat Forest Type and Plant Diversity of Sichuan Snub-nosed Monkey in Shennongjia National Nature Reserve

引用

Chinese Forestry Science and Technology 2012年第3期11卷 32-33页

作者： li guangliang Xue Yadong Zhang Yuguang Su Xiujiang Yan Jingyuan Wang Xiulei li Diqiang Research Institute of Forest Ecology Environment and ProtectionChinese Academy of ForestryKey Laboratory of Forest Ecology and EnvironmentState Forestry Administration Hu'nan Baiyunshan Nature Reserve Hubei Shennongjia National Nature Reserve Administration

The experimental plots in representative areas of the Shennongjia Nature Reserve were *** forest communities in Shennongjia were investigated by using *** plant communities in these plots were investigated to discern the pattern of species diversity distribution along the altitudinal ***α-diversity andβ- diversity were calculated by using the data collected. Theα-diversity of the tree layer peaked in the evergreen broadleaved forest zone at low-elevation, theα-diversity of the shrub layer increased gradually at first and then decreased along the altitudinal gradient,while theα-diversity of the herb layer peaked in ***β-diversity peaked at mid-elevations where the composition of edificatory species *** transition zone was characterized by relatively high levels of species diversity and species turn-over *** overall species richness peaked in *** results of this research could provide a sound basis for reserve management and planning,as well as preservation of Sichuan snub-nosed monkey in this reserve.

关键词： Sichuan snub-nosed monkey habitat community structure Shennongjia National Nature Reserve

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

Anlotinib attenuates the clinical severity of experimental autoimmune encephalomyelitis via suppressing Th17 cell differentiation and promoting Treg cell differentiation

Anlotinib attenuates the clinical severity of experimental a...

引用

第十四届全国免疫学学术大会

作者： Haoran Zhu guangliang li Jie Yin Hong Zhang Yurong Da Long li Tianjin Medical University

Context:In multiple sclerosis(MS),imbalance between Th17 cells and Treg cells is critical in autoimmune central nervous system(CNS) inflammation and *** autoimmune encephalomyelitis(EAE) is an established mouse MS model and simulates multiple sclerosis at diverse ***:This study aims at investigating impact of anlotinib on the clinical severity of EAE and on CD4T cell *** and Methods:EAE was induced by injecting mice subcutaneously 1:1 emulsion of 50 μg myelin oligodendrocyte glycoprotein(MOG35-55) peptide in complete Freund’s adjuvant(CFA).Water or anlotinib(6 mg/kg) was given by gavage *** the peak of EAE,histopathological examination and flow cytometry analysis of CNS-infiltrating CD4+T cells were *** vitro differentiation of CD4T cells under different conditions was detected by flow cytometry and quantitative real-time ***,the impacts of anlotinib on the phosphorylation of STAT3 and the transcription levels of key genes involved in Th17 and Treg diffe rentiation were ***:Anlotinib attenuated the clinical severity of EAE and changed the frequencies of CNS-infiltrating CD4+T cell *** inhibited the differentiation of Th17 cells in vitro,decreased the phosphorylation of STAT3 and reduced expression of *** promoted diffe rentiation of Treg cells and upregulated the expression levels of CD39 and *** and Conclusions:Anlotinib alleviated the symptoms of EAE via inhibiting the Th17 cell differentiation and promoting Treg cell diffe *** study provides new opportunities for the exploitation of anlotinib as therapeutic agent for the treatment of MS.

关键词： anlotinib multiple sclerosis EAE Th17 differentiation Treg differentiation

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Study on Structure and Photocatalytic Properties of Cu2O Nanocrystal Synthesized by Low temperature liquid-Phase Method

Study on Structure and Photocatalytic Properties of Cu2O Nan...

引用

中国材料大会2012

作者： Yingchao liu Jinbo Xue Chengzhong Chi Wei liang guangliang li College of Materials Science and Engineering Taiyuan University of Technology Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology Ministry of Education)

ISBN: (纸本)9783037856062;3037856068

Spherical and octahedral Cu2O nanocrystals were prepared by reducing copper acetate monohydrate (Cu(CH3COO)2·H2O) with hydrazine hydrate(N2H4·H2O) at ambient temperature and pressure. The influence of solution composition on the morphology and microstructure of Cu2O nanocrystals were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Ultraviolet and visible light spectrometer(UV-vis) was employed to investigate the photocatalysis behavior of the Cu2O samples. The results show that Cu(OH)2 was initially formed with the addition of NaOH and then reduced into Cu2O by N2H4·H2O. At the same time, a portion of Cu2O particles were further reduced to Cu, but the increasing of O2 contents in the solution under vigorous stirring reconvert Cu into Cu2O whichlead to the formation of pure Cu2O nanocrystals. The alkaline condition which provided by NaOH was the prerequisite for obtaining spherical and octahedral Cu2O crystals. The facile method was provided to fabricate Cu2O nanocrystals with outstanding photocatalysis performance at low temperature, which may play an important role in sewage treatment and organic pollutants decomposition.

关键词： Cuprous oxide liquid-phase reduction Nanosphere Octahedron Photocatalysis

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Deep Reinforcement Learning with Model Predictive Control for Path Following of Autonomous Underwater Vehicle

Deep Reinforcement Learning with Model Predictive Control fo...

引用

第43届中国控制会议

作者： Zheng Zhang Xingwei Pan Tianhao Chen Dong Jiang Zheng Fang guangliang li Ocean University of China

Autonomous underwater vehicle(AUV) is becoming increasingly important to perform underwater tasks. Modelfree reinforcement learning was applied for AUV path following, but is usually inefficient in sampling and time-consuming for training control policies. This paper proposed and implemented an MPC-based model-based reinforcement learning(MBMPC) method for AUV path following. To better capture the uncertainty of the dynamics model, feature vectors from the penultimate layer of the neural network fitting the dynamics model were extracted and Bayesian linear regression was performed on the extracted feature vectors and sampled. Model predictive control and cross-entropy method were used to select an optimal sequence of actions for each AUV state to perform. The proposed MB-MPC method was tested with an AUV simulator on Gazebo in path following tasks with and without currents. Our simulation results show that MB-MPC allows control policy of an AUV to obtain a better performance faster than traditional deep model-free reinforcement learning and model-based reinforcement learning without MPC. Further analysis indicates that MB-MPC has better generalization and adaptation to new tasks than model-free methods and traditional PID controller.

关键词： Model-based reinforcement learning Autonomous control Autonomous underwater vehicle Model predictive control Path following

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

雌激素受体亚型ER-α36与乳腺癌关系的研究进展

引用

肿瘤防治研究 2016年第3期43卷 238-242页

作者：李广亮滕理送浙江省肿瘤医院肿瘤内科杭州310022 浙江大学医学院附属第一医院肿瘤外科杭州310003

雌激素受体(estrogen receptor,ER)是一类有配体激活的核转录因子,介导大部分的雌激素反应,在体内具有重要的生理功能效应。ER主要分为ER-α和ER-β两个亚型,其中ER-α主要表达于乳腺和子宫组织内,在乳腺癌发生发展过程中发挥重要调控... 详细信息

雌激素受体(estrogen receptor,ER)是一类有配体激活的核转录因子,介导大部分的雌激素反应,在体内具有重要的生理功能效应。ER主要分为ER-α和ER-β两个亚型,其中ER-α主要表达于乳腺和子宫组织内,在乳腺癌发生发展过程中发挥重要调控作用。ER-α36是ER-α的一个分子量大小为36k D的新亚型,缺少ER-α的转录活化结构域AF-1及AF-2。ER-α36主要表达于乳腺癌细胞的细胞膜与胞质中,介导非核途径的雌激素信号转导。目前的研究认为ER-α36的调节异常与乳腺癌的发生、发展及治疗疗效密切相关,其有可能成为一个新的乳腺癌诊断、治疗及预后的标志物。在此,本文将对ER-α36的生物特性与功能、及其在乳腺癌内分泌耐药中的作用机制作一综述,评价其潜在的临床应用价值。

关键词：乳腺癌雌激素受体雌激素受体-α36 雌激素受体-α

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

德润四海——董仲舒“大一统”思想与汉武帝“西南夷”经略

引用

重庆大学学报（社会科学版） 2021年第4期27卷 83-91页

作者：朱舸李广良云南师范大学儒学与中国传统思想研究中心云南昆明650500

汉武帝时期,经学思想与政治由各自发展而汇入同一时代脉搏。作为这一时期的“儒者宗”,董仲舒努力改造儒学,使之成为实用于社会和国家的意识形态,其“大一统”学说适应了汉武帝“德润四海”的需求,从而完成了儒学由上到下的过渡。但是... 详细信息

汉武帝时期,经学思想与政治由各自发展而汇入同一时代脉搏。作为这一时期的“儒者宗”,董仲舒努力改造儒学,使之成为实用于社会和国家的意识形态,其“大一统”学说适应了汉武帝“德润四海”的需求,从而完成了儒学由上到下的过渡。但是由于汉匈战争,董仲舒的思想对匈奴并没有机会施展。由于有唐蒙凿路和张骞考察所奠定的基础,汉武帝决心对西南夷进行开拓与经营。因西南夷地理位置特殊,且在“四夷”中军事实力最弱,不会对中原王朝构成威胁。当汉王朝把军队集中于北部边郡,便不可能对西南夷采取像对匈奴一样的武力攻伐。对西南夷的经略实为汉王朝推广董仲舒“大一统”的思想提供了空间。这一儒学思想的实施集中体现在西南夷的开拓道路、置吏及移民方面。汉朝经略西南夷成为董仲舒思想在对待夷夏问题上的第一次成功实践。西南夷的开拓奠定了儒学的正宗地位。董仲舒“大一统”思想成为此后各代王朝的主导思想,对当今加强民族团结、发展民族经济与文化具有重要的借鉴意义。

关键词：董仲舒大一统汉朝儒学思想汉朝治边思想汉武帝边疆经略夷夏之变

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

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：