检索结果-南通市图书馆

Chemical Research in Chinese Universities 2013年第2期29卷 299-306页

作者： XU Xian-jin CANNISTRARO Salvatore BIZZARRI Anna-rita ZENG Yi CHEN Wei-zu wang cun-xin College of Life Science and Bioengineering Beijing University of Technology Beijing 100124 P. R. China Biophysics and Nanoscience Centre CNISM Dipartimento di Biologia ed Ecologia(DEB) Universita della Tuscia Viterbo 01100 Italy

Alternative mechanisms of toxic effects induced by 2,3,7,8-tetrachlorodibenzo-p-dioxin（TCDD）, instead of the binding to aryl hydrocarbon receptor（AhR）, have been taken into consideration. It has been recently shown that TCDD reduces rapidly the activity of CK2（casein kinase II） both in vivo and in vitro. It is found that TCDD has high molecular similarities to the known inhibitors of CK2 catalytic subunit（CK2a）. This suggests that TCDD could also be an ATP-competitive inhibitor of CK2a. In this work, docking TCDD to CK2 was carried out based on the two structures of CK2a from maize and human, respectively. The binding free energies of the predicted CK2a-TCDD complexes estimated by the molecular mechanics/Poisson-Boltzmann surface area（MM/PBSA） method are from -85.1 kJ/mol to -114.3 kJ/mol for maize and are from -96.1 kJ/mol to -118.2 kJ/mol for human, which are comparable to those estimated for the known inhibitor and also ATP with CK2a. The energetic analysis also reveals that the van der Waals interaction is the dominant contribution to the binding free energy. These results are also useful for designing new drugs for a target of overexpressing CK2 in cancers.

关键词： Casein kinase II Dioxin Inhibitor Modeling Binding free energy

Synthesis and Biological Activities of Quinoline Derivatives as HIV-1 Integrase Inhibitors

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

Chemical Research in Chinese Universities 2009年第6期25卷 841-845页

作者： LUO Zai-gang ZENG Cheng-chu wang Fang HE Hong-qiu wang cun-xin DUHong-guang HU Li-ming College of Life Science and Bioengineering Beijing University of Technology Beijing 100124 P. R. China College of Science Beijing University of Chemical Technology Beijing 100029 P. R. China

Based on the structure of the integrase core domain and pharmacophore perception, the authors picked out the hit quinolone derivative 1 as the lead compound via virtual screen in ACD, MDDIL NCI and Chinese Herb three-dimensional database with the aid of DOCK4.0 program and synthesized a series of analogues of compound 1. Their primary anti-HIV properties against integrase reveal that 6-position methyl group on the benzene ring of quinolone plays a more important role than chlorine, 7-position methyl group or no substituted group. But the title compounds exhibit little difference When the substituted group was phenyl or thienyl on the pyridine ring of quinoline.

关键词： Quinolone Integrase Anti-HIV activity

Light People:Professor Manijeh Razeghi

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第8期13卷 1451-1462页

作者： Hui wang cun Yu Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

The sense of light is the first sensation the human body *** importance of light is ***,we all know that the light we can see and perceive covers only a small section of the ***,for Light People,we feature a researcher who is committed to exploring different spectral bands of light ranging from deep ultraviolet to terahertz waves and working on quantum semiconductor technology,*** Razeghi of the Northwestern University in the United *** for her quick thinking and witty remarks,*** is passionate about life and always kind to *** a scientist,she does not limit her research to a single focus,instead,she works on the entire process from material selection,device design,processing,and manufacturing,all the way to product *** has a strong passion for education,a commitment unwavered by fame or *** her students,she is both a reliable source of knowledge and a motherly figure with a caring *** firmly believes that all things in nature can give her energy and *** science,she is a true“pioneer”in research and a“miner”of scientific *** advises young scientists to enjoy and love what they do,and turn their research into their *** a female scientist,she calls on all women to realize their true value and ***,let’s hear from Professor Manijeh Razeghi,a true star who radiates energy and light.

关键词： mother instead passion

Light People:Professor Laura Na Liu

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

Light(Science & Applications) 2024年第2期13卷 184-189页

作者： Hui wang cun Yu Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of Sciences130033ChangchunChina

Editorial The DNA nanotechnology outlines a new chapter in biological sciences,opening a new era of scientific and technological advancements.A pioneer of DNA nanotechnology,Professor Liu from the University of Stuttgart in Germany,our latest Light People,has been working at the interface,where nanophotonics meets biology and *** the path of scientific explorations.

关键词： chemistry. advancement pioneer

Study of Complexes of Lanthanum with Amino Acids by Titration Calorimeter

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

Wuhan University Journal of Natural Sciences 2000年第4期5卷 479-484页

作者： Ye Gang, wang cun-xin, Qu Song-sheng College of Chemistry and Environment Science, Wuhan University, Wuhan 430072, China College of Chemistry and Environment Science Wuhan UniversityWuhan 430072China

The stability constants and thermodynamic functions for complexes of lanthanum with eight kind of amino acids according to 1∶1 and 1∶2 in proportion have been determined by titration calorimeter at 298.15 K. The enthalpy change makes a predominant contribution to the stability of these complexes. The ring in amino acid associated with lanthanum ion helps to enhance the stability of complexes. Steric effects between rings in complexes leads to that the equilibrium constants of reaction of the complexes (1∶2) is much less than that of the complexes (1∶1).

关键词： titration calorimeter rare earth amino acid complexes steric effects

Quinoline Ring Derivatives as Potent Integrase Inhibitors Using Ligand-based Modeling Studies

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Biomedical Engineering(English Edition) 2015年第1期24卷 33-39页

作者： SUN Xiao-hui GUAN Jian-qing TAN Jian-jun LIU Chang wang cun-xin College of Life Science and Bio-engineering Beijing University of Technology

Integrase has become an attractive target for the design of anti-HIV inhibitor because it plays a quite important role in the process of HIV-1 virus replication. The quinoline ring derivatives, which have the similar pharmacophore toβ-diketoacids, are the kind of integrase inhibitor with highly antiviral activity. A series of quinoline ring derivatives were analyzed by the comparative molecular field analysis(Co MFA), comparative molecular similarity induces analysis(Co MSIA) and Topomer Co MFA methods. Firstly, we chose 77 compounds from former papers as a dataset,followed by dividing it into the training set and test set randomly. Then, we constructed predictive models of Co MFA, Co MSIA and Topomer Co MFA, respectively. The Co MFA yielded the best cross-validated model with a q2=0.758, non-cross-validated r2=*** Co MSIA model yielded a q2=0.701 and r2=0.986 while the Topomer Co MFA model has q2=0.661 and r2=0.966. Through verification, these results suggested a strong predictive ability to the design of novel highly active HIV-1 integrase inhibitors for therapy.

关键词： computer-aided drug design 3D-QSAR HIV-1 integrase inhibitor Co MFA Co MSIA Topomer Co MFA

Enhanced thermoelectric and mechanical properties of Bi_(0.5)Sb_(1.5)Te_(3) alloy with dispersed yttrium oxide ceramic nanoparticles

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第4期43卷 1758-1768页

作者： cun-Cheng Li Ming-Wei Zhang Ji-Wu xin Lei Wei Wen-Yu Zhao School of Materials Science and Engineering Shandong University of TechnologyZibo255000China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore639798Singapore State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

Reducing thermal conductivity while avoiding adverse interfacial reactions during sintering is crucial for improving the thermoelectric performance of Bi_(2)Te_(3)based *** ceramic nanoparticles are good candidates for achieving this *** this study,we designed and prepared a series of p-type Bi_(0.5)Sb_(1.5)Te_(3)nanocomposites decorated with Y_(2)O_(3)ceramic nanoparticles via ball-milling dispersion and spark-plasma *** to the chemical stability of the ceramics,no traces of atomic doping or interfacial reactions were *** measurements revealed that the Y_(2)O_(3)nanoparticles distributed along the grain boundaries acted as energy-dependent carrier-filtering centers to improve the scattering parameter and Seebeck coefficient,contributing to the elevated power factor even with a decreased electrical ***,the incorporated Y_(2)O_(3)nanoparticles and various defect structures they induced effectively strengthened the phonon scattering and suppressed the lattice thermal ***,a peak figure of merit(ZT)of 1.23 at 313 K was achieved for 0.4%Y_(2)O_(3)/Bi_(0.5)Sb_(1.5)Te_(3),which is 13%higher than that of the *** addition,the Vickers hardness of the composite material was 35%higher than that of the *** study demonstrates the effectiveness of ceramic nanoparticles in synergistic ally improving the thermoelectric and mechanical properties,which may be further extended to other thermoelectric systems.

关键词： Bi_(0.5)Sb_(1.5)Te_3 alloy Y_(2)O_(3) ceramic nanoparticles Microstructures Thermoelectric performance Mechanical properties

Near-infrared organic lasers with ultra-broad emission bands by simultaneously harnessing four-level and six-level systems

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第8期35卷 288-293页

作者： Lei wang Jun-Jie Wu Chang-cun Yan Wan-Ying Yang Zong-Lu Che xin-Yu Xia Xue-Dong wang Liang-Sheng Liao Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices Institute of Functional Nano&Soft Materials(FUNSOM)Soochow UniversitySuzhou 215123China Jiangsu Engineering Laboratory of Novel Functional Polymeric Materials College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Macao Institute of Materials Science and Engineering Macao University of Science and TechnologyMacao SAR 999078China

Organic lasers with broad emission bands in near-infrared(NIR)region are crucial for their applications in laser communication,night-vision as well as bioimaging owing to the abundance of selectable lasing ***,for most organic gain materials,gain regions are limited in a small wavelength range because of the fixed energy level ***,we design a strategy to realize NIR organic lasers with broad emission bands based on tunable energy level systems induced by cascaded excited-state intramolecular proton transfer(ESIPT).A novel gain material named DHNN was developed,which can undergo a cascaded double-ESIPT process supporting four-level and six-level systems *** doping DHNN into polystyrene microspheres,NIR lasers with tunable emission bands can be achieved based on the careful modulation of ***,organic lasers with an ultra-broad emission band ranging from 700 nm to 900 nm was successfully achieved by harnessing four-level and six-level systems simultaneously.

关键词： Excited-state intramolecular proton transfer Organic solid-state laser Wide gain interval Near-infrared emission Molecular design

Biochar with self-doped N to activate peroxymonosulfate for bisphenol-A degradation via electron transfer mechanism:The active edge graphitic N site

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第9期35卷 351-355页

作者： Yun-xin Huang Lin-Qian Yu Ke-Yu Chen Hao wang Shou-Yan Zhao Bao-Cheng Huang Ren-cun Jin School of Engineering Hangzhou Normal UniversityHangzhou 311121China Zhejiang Provincial Key Laboratory of Urban Wetlands and Regional Change Hangzhou 311121China

Environmental endocrine disruptors,represented by bisphenol A(BPA),have been widely detected in the environment,bringing potential health risks to human ***-containing biocarbon catalyst can activate peroxymonosulfate(PMS)to degrade BPA in water,but its active sites remain ***,in this work,nitrogen-containing biochar,i.e.,C–Nedge,enriched with graphitic-N defects at the edges was prepared by one-pot co-pyrolysis of chitosan and potassium *** results showed that the C–Nedge/PMS system can effectively degrade 98%of BPA(50 mg/L).The electron transfer based non-radical oxidation mechanism was responsible for BPA *** graphitic-N doping endows biochar with strong electron transfer *** catalyst had good recovery and reuse *** catalytic oxidation was also feasible for other refractory pollutants removal and worked well for treating practical *** work may provide valuable information in unraveling the N doping configurationactivity relationship during activating PMS by biochar.

关键词： Peroxymonosulfate Carbon-based catalysts Edge graphitic-N Non-radicals Bisphenol A

Layered niobium carbide enabling excellent kinetics and cycling stability of Li-Mg-B-H hydrogen storage material Layered niobium carbide enabling excellent kinetics

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第3期43卷 1153-1166页

作者： Li-Wen Lu Hui Luo Guang-Xu Li Yun Li xin-Hua wang cun-Ke Huang Zhi-QiangLan Wen-Zheng Zhou Jin Guo Mohammad Ismail Hai-Zhen Liu Guangxi Novel Battery Materials Research Center of Engineering Technology Guangxi Colleges and Universities Key Laboratory of Blue Energy and Systems IntegrationSchool of Physical Science and TechnologyGuangxi UniversityNanning530004China State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures Nanning530004China School of Mechanical and Electrical Engineering Quzhou College of TechnologyQuzhou324000China Department of Materials Science and Engineering Zhejiang UniversityHangzhou310027China Faculty of Ocean Engineering Technology and Informatics Universiti Malaysia Terengganu21030Kuala NerusTerengganuMalaysia Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin300071China

The Li-Mg-B-H composite(2LiBH_(4)+MgH_(2))has a high capacity of 11.4 wt%as a hydrogen storage ***,the slow kinetics and poor cycling stability severely restrict its practical *** this work,a layered Nb_(2)C MXene was first synthesized and then introduced to tailor the kinetics and cycling stability of the Li-Mg-B-H *** milled 2LiH+MgB_(2)composites were initially hydrogenated to obtain the 2LiBH_(4)+MgH_(2)*** 2LiBH_(4)+MgH_(2)+5wt%Nb_(2)C can release 9.0 wt%H_(2)in 30 min at 400℃,while it is only 2.7 wt%for the undoped 2LiBH_(4)+MgH_(2).The dehydrogenation activation energies of MgH_(2)and LiBH_(4)are 123 and 154 kJ·mol^(-1)respectively for the 5 wt%Nb_(2)C-doped composite,lower than the undoped composite(164 and 165 kJ·mol^(-1)).The 2LiBH_(4)+MgH_(2)+5 wt%Nb_(2)C possesses excellent cycling stability,with the reversible capacity only slightly reduced from 9.4 wt%for the 1st cycle to 9.3 wt%for the 20th ***_(2)C keeps stable in the composite and acts as an efficient catalyst for the Li-Mg-B-H *** is believed that both the layered structure and the active Nb element contribu te to the enhanced hydrogen storage performances of the Li-Mg-B-H *** work confirms that the Nb_(2)C MXene with layered stru cture has a significant enhancing impact on the Li-Mg-B-H hydrogen storage materials,which is different from the bulk NbC.

关键词： Hydrogen storage Lithium borohydride Magnesium hydride Nb_(2)C MXene