检索结果-南通市图书馆

Post-synthetic metalation of organic cage for enhanced porosity and catalytic performance

Science China Chemistry 2023年第6期66卷 1763-1770页

作者： Miao Yang Xun Chen yifei Xie El-Sayed MEl-Sayed Ning Xu Wenjing Wang Kongzhao Su Daqiang Yuan State Key Lab of Structure Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of the Chinese Academy of Sciences Beijing 100049China College of Chemistry Fuzhou UniversityFuzhou 310116China Chemical Refining Laboratory Refining DepartmentEgyptian Petroleum Research InstituteNasr City 11727Egypt

Porous organic cages(POCs)have shown great potential in many applications,and post-synthetic modification(PSM)has been confirmed to be an effective strategy to tailor their structures and related ***,it is extremely challenging to develop a general platform for simple-to-make functional POCs for advanced applications by PSM ***,we reported that octahedral calix[4]resorcinarene-based hydrazone-linked porous organic cage(HPOC-401)provides an excellent platform for post-synthetic metalation by various transition metal(TM)ions under mild conditions due to the abundance of coordination sites in its *** metalated products(HPOC-401-TM)exhibit Brunauer-Emmett-Teller(BET)surface area up to1,456 m^(2)g^(-1),much higher than that of the pristine HPOC-401,which has a BET value of 474 m^(2)g^(-1).Moreover,the metalation and porosity increases further influence their gas capture,separation,as well as catalytic *** instance,HPOC-401-TM products exhibit higher CO_(2),H_(2),and C2 hydrocarbon gas uptake,as well as higher C_(2)H_(6)/C_(2)H_(4) selectivity than ***,the HPOC-401-TM also shows better catalytic performance in the cycloaddition of CO_(2) with epoxides compared to *** findings uncover a simple yet effective approach for modifying the porosity characteristics of organic cages,which will undoubtedly expand their future implementations.

关键词： porous organic cage(POC) calixresorcinarene post-synthetic metalation(PSM) gas adsorption and separation CO_(2)cycloaddition

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

Distribution of pericellular matrix molecules in the temporomandibular joint and their chondroprotective effects against inflammation

引用

International journal of Oral Science 2017年第1期9卷 43-52页

作者： Wern Cui Chu Shipin Zhang Timothy j Sng Yu jie Ong Wen-Li Tan Vivien Y ang Casper B Foldager Wei Seong Toh Faculty of Dentistry National University of SingaporeSingapore Orthopaedic Research Laboratory Aarhus University HospitalAarhusDenmark Tissue Engineering Program Life Sciences InstituteNational University of SingaporeSingapore

The objectives of this study were to （1） determine the distribution and synthesis of pericellular matrix （PCM） molecules （collagen VI, collagen IV and laminin） in rat temporomandibular joint （TMj） and （2） investigate the effects of PCM molecules on chondrocytes against inflammation in osteoarthritis. Four zones （fibrous, proliferating, mature and hypertrophic） of condylar cartilage and three bands （anterior, intermediate and posterior） of disc were analysed by immunohistochemistry for the presence of PCM molecules in rat TMjs. Isolated chondrocytes were pre-treated with PCM molecules before being subjected to interleukin （IL）-II~ treatment to stimulate inflammation. The responses of the chondrocytes were analysed using gene expression, nitric oxide release and matrix metalloproteinase （MMP）-13 production measures. Histomorphometric analyses revealed that the highest areal deposition of collagen VI （67.4%）, collagen IV （45.7%） and laminin （52.4%） was in the proliferating zone of TMj condylar cartilage. No significant difference in the distribution of PCM molecules was noted among the three bands of the TMj disc. All three PCM molecules were expressed intracellularly by chondrocytes cultured in the monolayer. Among the PCM molecules, pre-treatment with collagen VI enhanced cellular proliferation, ameliorated IL-lp-induced MMP-3, MMP-9, MMP-13 and inducible nitric oxide synthase gene expression, and attenuated the downregulation of cartilage matrix genes, including collagen I, aggrecan and cartilage oligomeric matrix protein （COMP）. Concurrently, collagen VI pretreatment inhibited nitric oxide and MMP-13 production. Our study demonstrates for the first time the distribution and role of PCM molecules, particularly collagen VI, in the protection of chondrocytes against inflammation.

关键词： cartilage chondrocytes collagen iV collagen W inflammation laminin pericellular matrix temporomandibular joint

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

一种复杂环境下UWB测距误差预测方法

引用

导航定位学报 2024年第1期12卷 85-96页

作者：李圣令刘克中陈聪王一飞王国宇陈默子郑凯武汉理工大学航运学院武汉430063 内河航运技术湖北省重点实验室武汉430063 国家水运安全工程技术研究中心武汉430063 中船邮轮科技发展有限公司上海200137

针对复杂室内环境中,多径干扰和视距遮挡影响室内定位精度的问题,提出一种复杂环境下UWB测距误差的预测方法:根据超宽带(UWB)室内定位方法抗干扰能力强、定位精度高的特点,从理论上分析影响超宽带信号测距精度的因素;然后通过模型量化... 详细信息

针对复杂室内环境中,多径干扰和视距遮挡影响室内定位精度的问题,提出一种复杂环境下UWB测距误差的预测方法:根据超宽带(UWB)室内定位方法抗干扰能力强、定位精度高的特点,从理论上分析影响超宽带信号测距精度的因素;然后通过模型量化分析每种影响因素对测距误差的影响程度,改进以往通过信道脉冲响应特征分析单一的视距遮挡参数来提高定位精度的补偿算法;最后从数据挖掘和机器学习的角度出发,将多径效应、视距遮挡、标签与基站的距离、标签移动速度、标签与基站天线俯仰角以及气象因素(温度、湿度、压强)等对测距精度造成影响的重要因素作为特征进行分类和归类,并使用梯度提升决策树模型对数据集进行训练和预测。实验结果表明,该模型可以根据当前状态下的组合特征值估计出测距误差值,将当前预测的误差值补偿到测量值上,可以有效提高超宽带室内定位的精度。

关键词：室内定位超宽带(UWB)定位测距误差梯度提升决策树机器学习

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

辽东湾蛤蜊岗四角蛤蜊和光滑河蓝蛤的能量收支及其养殖容量评估

引用

渔业科学进展 2024年第6期45卷 47-56页

作者：姜娓娓白永安袁明军李伟伟李昂朱玲毛玉泽蒋增杰盘锦光合蟹业有限公司大连盘锦124200 海水养殖生物育种与可持续产出全国重点实验室、中国水产科学研究院黄海水产研究所山东青岛266071

为探究辽东湾蛤蜊岗四角蛤蜊(Mactra veneriformis)和光滑河蓝蛤(Potamocorbula laevis)的能量收支及其养殖容量情况,本研究利用便携式颗粒计数器、多通道溶氧仪以及现场流水系统,测定了四角蛤蜊[壳长(35.89±1.61) mm]和光滑河蓝蛤[壳... 详细信息

为探究辽东湾蛤蜊岗四角蛤蜊(Mactra veneriformis)和光滑河蓝蛤(Potamocorbula laevis)的能量收支及其养殖容量情况,本研究利用便携式颗粒计数器、多通道溶氧仪以及现场流水系统,测定了四角蛤蜊[壳长(35.89±1.61) mm]和光滑河蓝蛤[壳长(17.66±0.66) mm]的摄食、代谢等生理指标,分析了其能量分配策略,并在此基础上,基于有机碳供需平衡模型估算了辽东湾蛤蜊岗2种主要滩涂贝类的养殖容量。结果显示:1)四角蛤蜊和光滑河蓝蛤的滤水率分别为(4.87±0.85) L/(h·g)和(6.46±2.25) L/(h·g),耗氧率分别为(0.94±0.45)mg/(h·g)和(0.22±0.14)mg/(h·g),四角蛤蜊和光滑河蓝蛤的总吸收能分别为748.97~1 333.52 j/(h·g)和931.55~1 647.08 j/(h·g);2)基于有机碳供需平衡模型,结合海域初级生产力及贝类滤水率,估算出辽东湾蛤蜊岗海域1龄(总湿重6.7 g)、2龄(总湿重9.3 g)和3龄(总湿重14.6 g)四角蛤蜊的养殖容量分别为57、47和34 ind./m^(2);1龄(总湿重0.14 g)、2龄(总湿重0.69 g)和3龄(总湿重1.25 g)光滑河蓝蛤的养殖容量分别为346、143和99 ind./m^(2)。四角蛤蜊的平均养殖密度已超出了该海域的养殖容量,而光滑河蓝蛤的养殖密度尚存在一定的空间。研究结果为滩涂贝类资源的合理开发利用以及生物多样性保护提供了基础数据。

关键词：蛤蜊岗四角蛤蜊光滑河蓝蛤能量收支养殖容量

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Spatial variations in CO2 fluxes in a subtropical coastal reservoir of Southeast China were related to urbanization and land-use types

引用

journal of Environmental Sciences 2021年第11期33卷 206-218页

作者： yifei Zhang Min Lyu Ping Yang Derrick Y.F.Lai Chuan Tong Guanghui Zhao Ling Li Yuhan Zhang Hong Yang Key Laboratory of Humid Subtropical Eco-geographical Process of Ministry of Education Fujian Normal UniversityFuzhou 350007China School of Geographical Sciences Fujian Normal UniversityFuzhou 350007China Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China School of Urban and Rural Construction Shaoyang UniversityShaoyang 422000China Department of Geography and Resource Management The Chinese University of Hong KongHong KongChina College of Environmental Science and Engineering Fujian Normal UniversityFuzhou 350007China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control(AEMPC)School of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China Department of Geography and Environmental Science University of ReadingReading RG66AB United Kingdom

Carbon dioxide(CO_(2))emissions from aquatic ecosystems are important components of the global carbon cycle,yet the CO_(2)emissions from coastal reservoirs,especially in developing countries where urbanization and rapid land use change occur,are still poorly *** this study,the spatiotemporal variations in CO_(2)concentrations and fluxes were investigated in Wenwusha Reservoir located in the southeast coast of ***,the mean CO_(2)concentration and flux across the whole reservoir were 41.85±2.03μmol/L and 2.87±0.29 mmol/m2/h,respectively,and the reservoir was a consistent net CO_(2)source over the entire *** land use types and urbanization levels in the reservoir catchment significantly affected the input of exogenous carbon *** mean CO_(2)fluxwasmuch higher from waters adjacent to the urban land(5.05±0.87 mmol/m2/hr)than other land use *** with larger input of exogenous substance via sewage discharge and upstream runoff were often the hotspots of CO_(2)emission in the *** results suggested that urbanization process,agricultural activities,and large input of exogenous carbon could result in large spatial heterogeneity of CO_(2)emissions and alter the CO_(2)biogeochemical cycling in coastal *** studies should characterize the diurnal variations,microbial mechanisms,and impact of meteorological conditions on reservoir CO_(2)emissions to expand our understanding of the carbon cycle in aquatic ecosystems.

关键词： Carbon dioxide fluxes Spatiotemporal dynamics Land use Urbanization Anthropogenic activities Coastal reservoir

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

Tooth regeneration: a revolution in stomatology and evolution in regenerative medicine

引用

International journal of Oral Science 2011年第3期3卷 107-116页

作者： Sibel Yildirim Susan Y. Fu Keith Kim Hong Zhou Chang Hun Lee ang Li Sahng Gyoon Kim Shuang Wang jeremy j. Mao Tissue Engineering and Regenerative Medicine Laboratory （TERML） Center for Craniofacial Regeneration Columbia University Medical Center New York NY 10032 USA Department of Basic Science Xi＇an Jiaotong University School of Stomatology Xi＇ an 710049 China

A tooth is a complex biological organ and consists of multiple tissues including the enamel, dentin, cementum and pulp. Tooth loss is the most common organ failure. Can a tooth be regenerated？ Can adult stem cells be orchestrated to regenerate tooth structures such as the enamel, dentin, cementum and dental pulp, or even an entire tooth？ If not, what are the therapeutically viable sources of stem cells for tooth regeneration？ Do stem cells necessarily need to be taken out of the body, and manipulated ex vivo before they are transplanted for tooth regeneration？ How can regenerated teeth be economically competitive with dental implants？ Would it be possible to make regenerated teeth affordable by a large segment of the population worldwide？ This review article explores existing and visionary approaches that address some of the above-mentioned questions. Tooth regeneration represents a revolution in stomatology as a shift in the paradigm from repair to regeneration： repair is by metal or artificial materials whereas regeneration is by biological restoration. Tooth regeneration is an extension of the concepts in the broad field of regenerative medicine to restore a tissue defect to its original form and function by biological substitutes.

关键词： stem cells bioactive cues biomaterials cell homing dental pulp tooth regeneration growth factors scaffold dental implants pulp regeneration

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

A quantitative RT-PCR assay for rapid detection of Eurasianlineage H10 subtype influenza A virus

引用

Virologica Sinica 2016年第5期31卷 444-447页

作者： Hailiang Sun jian-Li Xue Elizabeth Bailey yifei Xu Guoliang Hu john Baroch Yi Zhang Lanny Pace Thomas j DeLiberto Xiu-Feng Wan Department of Basic Sciences College of Veterinary MedicineMississippi State UniversityMississippi 39762USA College of Animal Science and Technology Jiangxi Agricul-tural UniversityNanchang 330045China Animal and Plant Health Inspection Service of the US Depart-ment of Agriculture Fort Collins 80526USA Mississippi Veterinary Research and Diagnostic Laboratory College of Veterinary MedicineMississippi State UniversityMississippi 39762USA

Dear Editor,Influenza A viruses(IAVs)are single-stranded,negative sense RNA *** subtype is determined on the basis of the viral surface glycoproteins,hemagglutinin(HA),and neuraminidase(NA).To date,18 HA and 11NA subt... 详细信息

关键词： PCR A quantitative RT-PCR assay for rapid detection of Eurasianlineage H10 subtype influenza A virus RT

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

A Review of the Research on Language Teacher Autonomy

引用

Sino-US English Teaching 2012年第4期9卷 1045-1055页

作者： j.ang Yu-hong MATing Southwest University Chongqing China Xiao Tang Shan Middle School Beijing China

Teacher autonomy is one of the most significant and problematic concepts to have emerged from the field of teacher education in recent years. It has generally been referred to as teachers＇ control over their own teaching Teachers＇ autonomous learning is also one of the most effective ways to support teachers in their classroom practice, as well as to improve and expand their professional preparation and practices. Research on teacher autonomy in the field of second language education has had a short history and many terms related to language teacher autonomy are still under discussion. The paper mainly discusses the rationale of teacher autonomy and its related topics in the literature in recent years, and then presents the authors＇ own views about the research on teacher autonomy of university English teachers in China.

关键词： English teachers teacher autonomy literature review

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

SAMD4 family members suppress human hepatitis B virus by directly binding to the Smaug recognition region of viral RNA

引用

Cellular & Molecular Immunology 2021年第4期18卷 1032-1044页

作者： Yuze Wang Xinrui Fan Yunlong Song yifei Liu Ruixin Liu jianfeng Wu Xiaoling Li Quan Yuan Guo Fu Ningshao Xia jiahuai Han State Key Laboratory of Cellular Stress Biology Innovation Center for Cell Signaling NetworkSchool of Life SciencesXiamen UniversityXiamenFujian 361102China State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics National Institute of Diagnostics and Vaccine Development in Infectious DiseasesSchool of Public HealthXiamen UniversityXiamenFujian 361005China Cancer Research Center of Xiamen University Xianmen Hospital of Xiamen UniversitySchool of MedicineXiamen UniversityXiamenFujian 361102China

HBV infection initiates hepatitis B and promotes liver cirrhosis and hepatocellular ***-α is commonly used in hepatitis B therapy,but how it inhibits HBV is not fully *** screened 285 human interferon-stimulated genes(ISGs)for anti-HBV activity using a cell-based assay,which revealed several anti-HBV *** these ISGs,SAMD4A was the strongest suppressor of HBV *** found the binding site of SAMD4A in HBV RNA,which was a previously unidentified Smaug recognition region(SRE)sequence conserved in HBV ***4A binds to the SRE site in viral RNA to trigger its *** SAM domain in SAMD4A is critical for RNA binding and the C-terminal domain of SAMD4A is required for SAMD4A anti-HBV *** SAMD4B is a homolog of human SAMD4A but is not an ISG,and the murine genome encodes *** these SAMD4 proteins suppressed HBV replication when overexpressed in vitro and in *** also showed that knocking out the Samd4 gene in hepatocytes led to a higher level of HBV replication in mice and AAV-delivered SAMD4A expression reduced the virus titer in HBVproducing transgenic *** addition,a database analysis revealed a negative correlation between the levels of SAMD4A/B and HBV in *** data suggest that SAMD4A is an important anti-HBV ISG for use in IFN therapy of hepatitis B and that the levels of SAMD4A/B expression are related to HBV sensitivity in humans.

关键词： ISG Hepatitis B virus SAMD4 family proteins RNA degradation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Second-harmonic generation using d(33)in periodically poled lithium niobate microdisk resonators

引用

Photonics Research 2020年第3期8卷 311-317页

作者： ZHENZHONG HAO LI ZHang WENBO MAO ang GAO XIAOMEI GAO FENG GAO Fang BO GUOQUAN ZHang jINGjUN XU MOE Key Laboratory of Weak-Light Nonlinear Photonics TEDA Institute of Applied Physics and School of PhysicsNankai UniversityTianjin 300457China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

A fabrication process allowing for the production of periodically poled lithium niobate(PPLN)photonic devices with any domain pattern and unit size down to 200 nm is developed by combining semiconductor fabrication techniques and piezo-force-microscopy tips *** on this fabrication process,PPLN microdisk resonators with quality factors of 8×10~4 were fabricated from a Z-cut lithium niobate ***-harmonic generation(SHG)utilizing d(33)in the whole cavity was demonstrated in a PPLN microdisk with a 2μm-spatialperiod radial domain *** SHG conversion efficiency was measured to be 1.44×10^(-5)m W^(-1).This work paves the way to fabricate complex PPLN photonic devices and to obtain efficient nonlinear optical effects that have wide applications in both classical and quantum optics.

关键词： lithium harmonic niobate

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：