检索结果-南通市图书馆

Chinese Journal of Chemistry 1992年第2期10卷 130-137页

作者： YU,xiu-fen XU,li Department of Chemitsry,Fuzhou University,Fuzhou,Fujian 350002 Department of Chemistry Fuzhou University Fuzhou Fujian 350002

The synthesis and the structural characterization of the title compound HNa[WO（CCH）-（OCCH）（HO）][HWO]·13.5 HO are *** is known that the mixed oxo-ethylidyne-capped tritungsten cluster can be obtained by Zn dust reduction of NaWO·2HO in acetic *** title compound has been characterized by X-ray diffraction,UV/VIS andH NMR *** tungsten atoms in the cluster cation and anion are in the oxidation states of W（IV）and W（VI）*** crystal is rhombohedral with the space group R32,a=17.058（3）,c=49.665（9）,γ=120°,V=12516（9）,Z=6,final R=0.037 for 2071 reflections with I≥3σ（I）.Boththe cluster cation and anion have a *** important interatomic distances in angstroms forthe cluster cation are:W—W,2.730（2）;W—μ-O,2.00;W—O（carboxyl）,2.12;W—O,2.18（2）.

关键词： A new route to prepare the mixed oxo-ethylidynecapped trinuclear tungsten H2O H2W O2CCH3 cluster and the crystal structure of H2Na3[W3O CCH3 Na

Crystalline porous materials for catalytic conversion of lignin-related substances

在线全文

学校读者我要写书评

暂无评论

Aggregate

Aggregate 2024年第3期5卷 142-163页

作者： Qing Huang Pengfei Wu xiu-fen li Yi-Rong Wang Dan Tian Ya-Qian Lan College of Materials Science and Engineering Nanjing Forestry UniversityNanjingJiangsuP.R.China School of Chemistry South China Normal UniversityGuangzhouP.R.China Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjingJiangsuP.R.China

The conversion of the biomass into eco-friendly fuels and chemicals has been exten-sively recognized as the essential pathway to achieve the sustainable economy and carbon neutral ***,as a kind of promising biomass energy,has been certified to produce the high-valued chemicals and *** efforts have been made to develop various catalysts for lignin catalytic *** metal-organic frameworks(MOFs)and covalent organic frameworks(COFs)belong to very important heterogeneous porous catalysts due to their regular porous struc-tures,high specific surface area,and precisely tailored *** the review,thefirst part focused on the catalytic conversion of lignin,lignin model compounds,and lignin derivatives using the pristine MOFs,functional MOF composites,and MOF-derived *** second part summarized the catalytic conversion of lignin model compounds using pristine COFs and functional COF *** review here mainly concentrated on the design of the materials,screening of catalytic conditions,and explorations of the corresponded ***,(1)we summarized the MOF-and COF-based materials for the effects on the catalytic trans-formation of lignin-related substances;(2)we emphasized the catalytic mechanism of C–C and C–O bonds cleavage together with the structure–activity relationships;(3)we in-depth realized the relationship between the chemical/electronic/structural properties of the MOF-and COF-based catalysts and their catalytic performance for lignin-related ***,the challenges and future perspectives were also discussed on the catalytic conversion of lignin-related substances by MOF-and COF-based catalysts.

关键词： catalytic conversion covalent organic frameworks lignin lignin derivatives lignin model compounds metal-organic frameworks

Association of DNA with nuclear matrix in in vitro assembled nuclei induced by rDNA from Tetrahymena shanghaiensis in Xenopus egg extracts

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

Cell Research 1997年第1期7卷 107-117页

作者： CHEN YING BO ZHANG xiu fen li ZHONG HE ZHAI(Department of Cell Biology and Genetics, College of life Sciences, Peking University, Beijing 100871) Department of Cell Biology and Genetics College of Life Sciences Peking University Beijing

The nuclei assembled from exogenous DNA or chromatin in egg extracts resemble their in vivo counterparts in many aspects. However, the distribution pattern of DNA in these nuclei remains unknown. We introduced rDNA from the macronuclei of Tetrabymena into Xenopus cellfree extracts to examine the association of specific DNA sequences with nuclear matrix (NM) in the nuclei assembled in vitro. Our previous works showed the 5'NTS (nontranscription sequences) of the rDNA specifically bind to the NM system in the macronuclei. We show now the rDNA could induce chromatin assembly and nuclear formation in Xenopus cell-free system. When we extracted the NM system and compared the binding affinity of different regions of rDNA with the NM system, we found that the 5'NTS still hold their binding affinity with insoluble structure of the assembled nuclei in the extracts of Xenopus eggs.

关键词： Nuclear assembly nuclear matrix Xenopus egg extracts Tetrahymena rDNA

Micro-strain regulation strategy to stabilize perovskite lattice based on the categories and impact of strain on perovskite solar cells

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 578-604页

作者： Caixia li Wenwu liu Shiji Da lingbin Kong fen Ran State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology School of Materials Science and Engineering Lanzhou University of Technology

Photovoltaic metal halide perovskite solar cells(PSCs) convert light to electricity more efficiently than crystalline silicon cells, and the cost of materials used to make them is lower than that of silicon *** efficiency is not a core issue affecting the application of perovskite solar cells in special *** present, stability is the major technical encounters that hinders its further commercial development. Microstrain in PSCs is currently a significant factor responsible for the device's instability. Strain-induced ion migration is widely believed to accelerate perovskite degradation even when external stimuli are ***, it is imperative to study strain to enhance the stability of PSCs. This paper reviews recent developments to understand strain's origin and effect mechanisms on performance of PSCs, including ion migration,failure behavior, defect formation, and its effect on photoelectric properties, stability, and ***, several well-known strain management strategies are systematically introduced based on the strain effect mechanism and strain engineering on the film, providing more clues for further preparation with increased stability. The manipulation of external physical strain applied from films to entire devices has been extensively studied. Furthermore, recommendations for future research directions and chemical approaches have been provided. It is emphasized that strain engineering plays a crucial role in improving the efficiency and longevity of PSCs. Tensile strain causes rapid degradation, while moderate compressive strain and external strain control could improve properties and stability. Efforts should focus on controlling compressive strain to mitigate residual tensile strain and introducing it in a controlled manner. Future research endeavors may focus on exploring these pathways to improve the efficiency and lifespan of PSCs.

关键词： Halide perovskite solar cells Strain origins Strain effects Strain management

HMM in Predicting Protein Secondary Structure

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2003年第S1期8卷 307-310页

作者： Huang Jing, Shi feng, Zou xiu-fen,li Yuan-xiang,Zhou Huai-beiSchool of Mathematics and Statistics, Wuhan University, Wuhan 430072,Hubei, ChinaAdvanced Research Center for Science & Technology , Wuhan University,Wuhan 430072,Hubei,ChinaState Key Laboratory of Software Engineer, Wuhan University, Wuhan 430072,Hubei, China School of Mathematics and Statistics Wuhan University Wuhan Hubei China Advanced Research Center for Science & Technology Wuhan University Wuhan Hubei China State Key Laboratory of Software Engineer Wuhan University Wuhan Hubei China

We introduced a new method---duration Hidden Markov Model (dHMM) to predicate the secondary structure of Protein. In our study, we divide the basic second structure of protein into three parts: H (a-Helix), E (B-sheet) and O (others, include coil and turn). HMM is a kind of probabilistic model which more thinking of the interaction between adjacent amino acids (these interaction were represented by transmit probability), and we use genetic algorithm to determine the model parameters. After improving on the model and fixed on the parameters of the model, we write a program HMMPS. Our example shows that HMM is a nice method for protein secondary structure prediction.

关键词： hidden markov Model Viterbi algorithm protein secondary structure

Changes of limiting Dextrinase in Germinating Process of Malting Barley

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2002年第9期1卷 982-987页

作者： liANG xiu-mei, li fen, WANG Hong-zhen and WANG Xing-zhi(Department of Biology, Hulunbeir College, Hailaer 021008 , P.R.China Institute of Genetics and Cytology , Northeast Normal University, Changchun 130024 , P. R . China ) Department of Biology Hulunbeir College Hailaer 021008 P.R. China Institute of Genetics and Cytology Northeast Normal University Changchun 130024 P. R . China

Based on five different species of barley, the foot layer analytic method was used to examine the activity and heat-resistance of the limiting dextrinase. The study was conducted on the dynamic changes of several types of the dextrinase in barley germinating process, the effect of temperature on the dextrinase and the divergence of dextrinase in different barley variety. The probability of the dextrinase that as reference index is

关键词： limiting dextrinase Barley malt Beer brewing

在线全文

学校读者我要写书评

暂无评论

血浆置换治疗肝病术中常见护理问题及措施

实用护理杂志 2001年第8期17卷 16-17页

作者：李秀芬史建莉首都医科大学附属北京朝阳医院消化内科北京100020

目的探讨血浆置换治疗肝病术中常见护理问题及措施。方法通过对24例34次血浆置换术的观察，总结术中常见的护理问题产生的因素及护理措施。结果血浆置换是治疗重症肝病的有效方法，但术中可出现过敏反应、低血压、穿刺针脱出血管... 详细信息

目的探讨血浆置换治疗肝病术中常见护理问题及措施。方法通过对24例34次血浆置换术的观察，总结术中常见的护理问题产生的因素及护理措施。结果血浆置换是治疗重症肝病的有效方法，但术中可出现过敏反应、低血压、穿刺针脱出血管、术后感染且病人易产生恐惧心理等护理问题。结论掌握熟练的操作技能和术中的密切观察护理是保证血浆置换顺利完成的关键。

关键词：血浆置换肝疾病护理治疗手术中

Plasmonic tandem heterojunctions enable high-efficiency charge transfer for broad spectrum photocatalytic hydrogen production

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 710-720页

作者： Wenxuan Chen xiu-Qing Qiao Guo Hui Bojing Sun Dongfang Hou Meidi Wang Xueqian Wu Tao Wu Dong-Sheng li College of Materials and Chemical Engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials China Three Gorges University Hubei Three Gorges Laboratory College of Chemistry and Materials Science and Guangdong Provincial Key Laboratory of Supramolecular Coordination Chemistry Jinan University

Rational engineering of semiconductor photocatalysts for efficient hydrogen production is of great significance but still challenging,primarily due to the limitations in charge transfer ***,a fascinating plasmonic tandem heterojunction with the hc-CdS/Mo2C@C heterostructure is aimfully prepared for effectively promoting the charge separation kinetics of the CdS photocatalyst via the synergistic strategy of phase junction,Schottky junction,and photothermal *** difference in atomic configuration between cubic-CdS （c-CdS） and hexagonal-CdS （h-CdS） leads to effective charge separation through a typical Ⅱ charge transfer mechanism,and plasmonic Schottky junction further extracts the electrons in the hc-CdS phase junction to realize gradient charge ***,the photothermal effect of Mo2C@C helps to expand the light absorption,accelerate charge transfer kinetics,and reduce the hydrogen evolution energy *** carbon layer provides a fast channel for charge transfer and protects the photocatalyst from *** a result,the optimized hc-CMC photocatalyst exhibits a significantly high photocatalytic H2production activity of 28.63 mmol/g/h and apparent quantum efficiency of 61.8%,surpassing most of the reported *** study provides a feasible strategy to enhance the charge transfer kinetics and photocatalytic activity of CdS by constructing plasmonic tandem heterogeneous junctions.

关键词： Cadmium sulfide

新疆3个HCM家系MYH7基因突变DHPLC检测和DNA测序结果分析

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

基础医学与临床 2012年第12期32卷 1437-1441页

作者：杨忠伟冯秀丽王伟王忠新疆石河子大学医学院教学实习基地奎屯农七师医院新疆石河子832000 新疆石河子大学医学院研究生办新疆石河子832000 新疆石河子大学医学院第一附属医院新疆石河子832000

目的研究家族性肥厚型心肌病(HCM)的主要致病基因β肌球蛋白重链,MYH7突变情况。方法用变性高效液相色谱DHPLC检测和DNA测序方法对3个HCM家系成员的MYH7基因8、14外显子及附近上下游序列进行检测分析。结果 3个家系其中1个家系发现MYH7... 详细信息

目的研究家族性肥厚型心肌病(HCM)的主要致病基因β肌球蛋白重链,MYH7突变情况。方法用变性高效液相色谱DHPLC检测和DNA测序方法对3个HCM家系成员的MYH7基因8、14外显子及附近上下游序列进行检测分析。结果 3个家系其中1个家系发现MYH7基因14外显子中存在Thr441Met突变,该突变在中国人中是首次发现,此外外显子8也存在1个点突变。另外两个家系也发现有不同位点的突变。结论运用变性高效液相色谱技术和DNA直接测序技术能实现对家族性肥厚型心肌病MYH7基因突变的筛查,有利于早期诊断、患病风险预测。

关键词：家族性肥厚型心肌病 β肌球蛋白重链基因突变

Magnetron sputtered nickel oxide with suppressed interfacial defect states for efficient inverted perovskite solar cells

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 348-355页

作者： Guoqiang Ma Qin Tan Zhaoning li Jingwei xiu Jiafeng Wang Tianle Cheng Dong He Qiang Sun Xuhang Ma Francesco Lamberti Zhubing He Department of Materials Science and Engineering Institute of Innovative Materials (I2M) Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG)Southern University of Science and Technology (SUSTech) Core Research Facilities Southern University of Science and Technology Department of Chemical Sciences Department of Industrial Engineering University of Padova

Widely used spin-coated nickle oxide （NiOx） based perovskite solar cells often suffer from severe interfacial reactions between the NiOxand adjacent perovskite layers due to surface defect states,which inherently impair device performance in a long-term view,even with surface molecule *** this study,we developed high-quality magnetron-sputtered NiOxthin films through detailed process optimization,and compared systematically sputtered and spin-coated NiOxthin film surfaces from materials to *** sputtered NiOxfilms exhibit improved crystallinity,smoother surfaces,and significantly reduced Ni3+or Ni vacancies compared to their spin-coated ***,the interface between the perovskite and sputtered NiOxfilm shows a substantially reduced density of defect *** solar cells （PSCs） fabricated with our optimally sputtered NiOxfilms achieved a high power conversion efficiency （PCE） of up to 19.93%and demonstrated enhanced stability,maintaining 86.2% efficiency during 500 h of maximum power point tracking under one standard sun ***,with the surface modification using (4-(2,7-dibromo-9,9-dimethylacridin-10（9H）-yl)butyl)p hosphonic acid （DMAcPA）,the device PCE was further promoted to 23.07%,which is the highest value reported for sputtered NiOxbased PSCs so far.

关键词： Perovskite