检索结果-南通市图书馆

A Bi-Functional Xyloglucan Galactosyltransferase Is an Indispensable Salt Stress Tolerance Determinant in Arabidopsis

引用

Molecular Plant 2013年第4期6卷 1344-1354页

作者： Wenbo li Qingmei Guan Zhen-yu Wang Yingdian Wang Jianhua Zhu College of life Sciences Beijing Normal University Beijing 100875 China Department of Plant Science and Landscape Architecture University of Maryland College Park MD 20742 USA Center for Plant Stress Genomics and Technology King Abdullah University of Science and Technology Thuwal 23955-6900 Kingdom of Saudi Arabia

Salinity is an abiotic stress that substantially limits crop production worldwide. To identify salt stress tolerance determinants, we screened for Arabidopsis mutants that are hypersensitive to salt stress and designated these mutants as short root in salt medium （rsa）. One of these mutants, rsa3-1, is hypersensitive to NaCI and liCI but not to CsCI or to general osmotic stress. Reactive oxygen species （ROS） over-accumulate in rsa3-1 plants under salt stress. Gene expression profiling with Affymetrix microarray analysis revealed that RSA3 controls expression of many genes including genes encoding proteins for ROS detoxification under salt stress. Map-based cloning showed that RSA3 encodes a xyloglucan galactosyltransferase, which is allelic to a gene previously named MUR3/KAM1. The RSA3/ MUR3/KAMl-encoded xylogluscan galactosyltransferase regulates actin microfilament organization （and thereby con- tributes to endomembrane distribution） and is also involved in cell wall biosynthesis. In rsa3-1, actin cannot assemble and form bundles as it does in the wild-type but instead aggregates in the cytoplasm. Furthermore, addition of phal- Ioidin, which prevents actin depolymerization, can rescue salt hypersensitivity of rsa3-1. Together, these results sug- gest that RSA3/MUR3/KAM1 along with other cell wall-associated proteins plays a critical role in salt stress tolerance by maintaining the proper organization of actin microfilaments in order to minimize damage caused by excessive ROS.

关键词： salt stress tolerance xyloglucan galactosyltransferase endomembranes actin microfilaments RSA3.

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

引用

World Journal of Clinical Cases 2021年第19期9卷 5302-5312页

作者： Jun-yu li Shuo-Zi liu Dan-Feng Zheng Ying-Shuang Zhang Miao yu Department of Orthopaedics Peking University Third HospitalBeijing 100083China Department of Hematology Peking University Third HospitalBeijing 100083China Department of Pathology Peking University Third HospitalBeijing 100083China Department of Neurology Peking University Third HospitalBeijing 100083China

BACKGROUND Scoliosis is a complex three-dimensional deformity of spine and one of the common complications of collagen VI-related myopathy,caused by mutations in collagen type VI alpha 1 chain(COL6A1),COL6A2,and COL6A3 *** typical clinical presentations of collagen VI-related myopathy include weakness,hypotonia,laxity of distal joints,contractures of proximal joints,and skeletal *** SUMMARY A 28-year-old female presented with scoliosis for 28 years without weakness,hypotonia,laxity of distal joints,and contracture of proximal *** tomography and magnetic resonance imaging revealed hemivertebra,butterfly vertebra,and the missing vertebral *** underwent orthopedic surgery and paravertebral muscle *** Cobb angle dropped from 103.4°to 52.9°.However,the muscle biopsy showed neurogenic muscular atrophy with myogenic lesions,suggesting congenital muscular *** analysis indicated that mutations in COL6A1(c.1612-10G>A)and COL6A2(c.115+10G>T,c.2749G>A).Immunohistochemistry staining for collagen VI displayed shallow and ***,the patient was diagnosed as collagen VI-related *** This newly found subtype of collagen VI-related myopathy has no typical manifestations;however,it is characterized by severe scoliosis and congenital vertebral deformity.

关键词： Paravertebral pathology Scoliosis Collagen VI-related myopathy Genetic testing Neuromuscular diseases Case report

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

Frequency-dependent alterations in regional homogeneity in young carriers of the apolipoprotein E genotype

引用

Science Bulletin 2017年第9期62卷 654-655页

作者： Xi-Ze Jia Yi-Wen Zhang yu-Feng Zang Hui-Jie li CAS Key Laboratory of Behavioral Science Institute of Psychology Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China Zhejiang Key Laboratory for Research in Assessment of Cognitive Impairments Center for Cognition and Brain Disorders Hangzhou Normal University Hangzhou 311121 China Institutes of Psychological Sciences Hangzhou Normal University Hangzhou 311121 China

Using resting-state functional magnetic resonance imaging(rf MRI),previous studies showed that the APOE e4 allele might affect the functional connectivity between remote brain regions[1,2].However,the local functional... 详细信息

关键词： test MRI data SPM Re Frequency-dependent alterations in regional homogeneity in young carriers of the apolipoprotein E genotype MTL FWHM FOV

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

All-sky Guide Star Catalog for CSST

引用

Research in Astronomy and Astrophysics 2024年第4期24卷 35-59页

作者： Hui-Mei Feng Zi-Huang Cao Man I Lam ran li Hao Tian Da-Yi Yin yuan-yu Yang Xin Zhang Dong-Wei Fan Yi-Qiao Dong Xin-Feng li Wei Wang Long li Hugh RAJones Yi-Han Tao Jia-Lu Nie Pei-Pei Wang Mao-yuan liu He-jun Yang Chao liu Key Laboratory of Cosmic Rays(Tibet University) Ministry of EducationLhasa 850000China Institute for Frontiers in Astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China University of ChineseAcademy of Sciences Beijing 100049China Shanghai Institute of Technical Physics Chinese Academy of SciencesShanghai200083China Technology and Engineering Center for Space Utilization.Chinese Academy of Sciences Beijing 100094China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Centre for Astrophysics University of HertfordshireHatfieldUK Beijing University of Technology Beijing 100124China

The China Space Station Telescope(CSST)is a two-meter space telescope with multiple back-end *** Fine Guidance Sensor(FGS)is an essential subsystem of the CSST Precision Image Stability System to ensure the required absolute pointing accuracy and line-of-sight *** this study,we construct the Main Guide Star Catalog for *** accomplish this,we utilize the information about the FGS and object information from the Gaia Data Release *** provide an FGS instrument magnitude and exclude variables,binaries,and high proper motion stars from the catalog to ensure uniform FGS guidance ***,we generate a HEALPix index,which provides a hierarchical tessellation of the celestial sphere,and employ the Voronoi algorithm to achieve a homogeneous distribution of stars across the *** distribution ensures adequate coverage and sampling of the *** performance of the CSST guide star catalog was assessed by simulating the field of view of the FGS according to the CSST mock survey strategy *** analysis of the results indicates that this catalog provides adequate coverage and *** catalog's performance meets the FGS requirements,ensuring the functioning of the FGS and its guidance capabilities.

关键词： catalogs astrometry instrumentation:detectors

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

The Effect of Vineyard Cover Crop on Main Monomeric Phenols of Grape Berry and Wine in Vitis viniferal L. cv. Cabernet Sauvignon

引用

Agricultural Sciences in China 2010年第3期9卷 440-448页

作者： XI Zhu-mei ZHANG Zhen-wen CHENG yu-feng li Hua College of Enology Northwest A＆F University/Shaanxi Engineering Research Center for Viti-Viniculture Yangling 712100 P.R.China

This study was conducted to determine the effect of cover crop inter-row in vineyard on main mono-phenol content of grape berry and wine. Three such cover crops, two perennial legumes （white clover and alfalfa） and a perennial gramineous grass （tall fescue） were sown in vineyard. The main phenolic compounds of mature grape berry and wines vinified under the same conditions were extracted with ethyl acetate and diethyl ether and analyzed by high- performance liquid chromatography （HPLC） by comparing to soil tillage. A total of ten phenolic compounds were identified and quantified in the different grape berry and wines, including nonflavonoids （hydroxybenzoic and hydroxycinnamic acids） and flavonoids （flavanols and flavonols）. The concentration of flavonoid compounds （409.43 to 538.63 mg kg^-1 and 56.16 to 81.30 mg L^-1） was higher than nonflavonoids （76.91 to 98.85 mg kg^-1 and 30.65 to 41.22 mg L^-1） for Cabernet Sauvignon grape and wine under different treatments, respectively. In the flavonoid phenolics, Catechin was the most abundant in the different grapes and wines, accounting for 74.94 to 79.70% and 48.60 to 50.62% of total nonanthocyanin phenolics quantified, respectively. Compared to soil tillage, the sward treatments showed a higher content of main mono-phenol and total nonanthocyanin phenolics in grapes and wines. There were significant differences between two cover crop treatments （tall fescue and white clover） and soil tillage for the content of benzoic acid, salicylic acid, caffeic acid, catechin, and total phenolics in the grape berry （P 〈 0.05 or P〈0.01）. The wine from tall fescue cover crop had the highest gallic acid, caffeic acid and catechin. Cover crop system increased the total nonanthocyanin phenolics of grapes and wines in order of the four treatments： tall fescue, white clover, alfalfa, and soil tillage （control）. Cover crop in vineyard increased total phenols of grape berry and wine, and thus improved the quality of wine evidently.

关键词： vineyard cover crops inter-row Cabernet Sauvignon grape berry wine monomeric phenols

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

Studies on the Mechanism of Methyl Methacrylate Polymerization Initiated　by　Volatile　and　Nonvolatile　Products　of　Methyl　Methacrylate　Plasma

引用

Chemical Research in Chinese Universities 1995年第3期11卷 250-255页

作者： liu, Xiao-dong li, Jing Ma, yu-gang Shen, Jia-cong NORMAN BETHUNE UNIV MED SCI BASIC MED COLLCHANGCHUN 130023PEOPLES R CHINA JIliN UNIV KEY LAB MOLEC SPECTRA & STRUCTCHANGCHUN 130023PEOPLES R CHINA

he volatile (VPP) and nonvolatile (NVPP) products of methyl methacrylate(MMA) reaction in plasma chamber were used as initiators of MMA polymeriza-tion. From the structure analyses of the two initiators, the measurement of poly-merization kinetics, and the determination of the molecular weight of resultantpolymers , we found tliat MMA polymerization initiated by NVPP is a typical radical mechanism of polymerization which undergoes a process of continuous initiationand bifunction termination , while VPP-initiated polymerization suggested a mech-anism of living radical process fpolymerization with instantaneous initiation , chain-transfer to monomer , without termination).

关键词： Plasma initiated polymerzation Methyl methacrylate Kinetics

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

Analysis of Non-uniform Mechanical Behavior for a Continuous Casting Mold Based on Heat Flux from Inverse Problem

引用

Journal of Iron and Steel Research International 2016年第2期23卷 83-91页

作者： Feng-ming DU Xu-dong WANG yu liU Tian-yi li Man YAO School of Materials Science and Engineering Dalian University of Technology

The distortion of mold plates plays an important role in the formation of surface cracks on continuously cast steel products. To investigate the non-uniform distortion of a mold, a full-scale stress model of the mold was de veloped. An inverse algorithm was applied to calculate the heat flux using the temperatures measured by the thermo- couples buried inside the mold plates. Based on this, a full-scale, finite-element stress model, including four copper plates, a nickel layer and water slots in different depths, was built to determine the complex mechanical behavior of the continuous casting mold used to produce steel slabs. The heat flux calculated by the inverse algorithm was applied to the stress model to analyze the non-uniform mechanical behavior. The results showed that the stress and distortion distributions of the four copper plates were not symmetrical, which reflected the non-uniform distortion behaviors of copper plates, water slots, nickel layer and the corner region of the mold. The gap between the mold and the slab was increased because of the corner distortion, which was very important for the heat transfer of initial solidifying shell, and it may be a major reason for the slow cooling of the slab corner.

关键词： finite-element stress model inverse algorithm nickel layer water slots continuous casting mold

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 bio-based epoxy resin derived from p-hydroxycinnamic acid with high mechanical properties and flame retardancy

引用

Chinese Chemical Letters 2022年第11期33卷 4912-4917页

作者： Xin Song Ze-Peng Deng Chun-Bo li Fei Song Xiu-li Wang li Chen De-Ming Guo yu-Zhong Wang The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE) National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan)State Key Laboratory of Polymer Materials EngineeringCollege of ChemistrySichuan UniversityChengdu 610064China

Recent advances in epoxy resins have been forward to achieving high mechanical performance,thermal stability,and flame ***,seeking sustainable bio-based epoxy precursors and avoiding introduction of additional flame-retardant agents are still of increasing *** we report the synthesis of p-hydroxycinnamic acid-derived epoxy monomer(HCA-EP)via a simple one-step reaction,and the HCA-EP can be cured with 4,4′-diaminodiphenylmethane(DDM)to prepare epoxy *** with the typical petroleum-based epoxy resin,bisphenol A epoxy resin,the HCA-EP-DDM shows a relatively high glass transition temperature(192.9℃)and impressive mechanical properties(tensile strength of 98.3 MPa and flexural strength of 158.9 MPa).Furthermore,the HCA-EP-DDM passes the V-1 flammability rating in UL-94 test and presents the limiting oxygen index of 32.6%.Notably,its char yield is as high as 31.6%under N_(2),and the peak heat rate release is 60%lower than that of bisphenol A epoxy *** findings provide a simple way of using p-hydroxycinnamic acid instead of bisphenol A to construct high-performance bio-based thermosets.

关键词： Epoxy resin Bio-based p-Hydroxycinnamic acid Mechanical performance Intrinsic flame retardancy

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

Optimal Pole Ratio of Spoke-type Permanent Magnet Vernier Machines for Direct-drive Applications

引用

CES Transactions on Electrical Machines and Systems 2022年第4期6卷 454-464页

作者： yu Zhao Dawei li Xiang Ren Ronghai Qu Jianbo Sun Ping yu the State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan430074China IEEE the Jing-Jin Electric Technology (Zhengding) Co. Ltd

Due to magnetic gearing effects,spoke-type permanent magnet vernier machines(ST-PMVMs)have the merit of high torque density,where an extra torque amplification coefficient,i.e.,pole ratio(the pole-pair ratio of PMs to armature windings)is ***,different from surface-mounted PMVM,the variation of torque against pole ratio in ST-PMVMs is non-linear,which is increased at first and then *** article is devoted to identify the optimal pole ratio of ST-PMVMs by equivalent magnetic circuit *** is found that except the Prth air-gap magnetomotive force(MMF)harmonic having the same pole-pair of PM,the Path air-gap MMF harmonic having the same pole-pair of armature winding is also induced due to the modulation of doubly salient air-gap *** Prth MMF harmonic produces positive torque,while Path MMF harmonic produces negative *** the increase of pole ratio,the proportion of Path MMF harmonic as well as negative torque is increased,which reduces the advantages of high pole ratio ***,the influence of dimension parameters on the performance of ST-PMVMs under different pole ratio are *** show that ST-PMVMs with pole ratio 2.6 have high torque density,low cogging torque and high power factor ***,a prototype is manufactured to validate the analysis.

关键词： Spoke-type permanent magnet machines(ST-PMVMs) Pole ratio Back electromagnetic force(EMF)and torque capability

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

Surface vitrification of carbon by laser treatment: Insights of glass formation from molecular dynamics

引用

Journal of Advanced Ceramics 2024年第6期13卷 729-735页

作者： Yanhui Zhang Haifeng yu Yongying Jia Zhisheng Zhao li-Min Wang Riping liu Center for Advanced Structural Materials State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China

Microstructural modification of carbon materials,such as carbon fibers(Cf)and pyrolytically deposited carbon,is important for engineering ***,the regulation of these materials is not an effortless *** understand the impacts of thermal spikes from pulsed laser processing on the structural adaptation of amorphous carbon(a-C),we performed melt quenching by molecular dynamics(MD)*** results confirm that the vitrification behavior of carbon can be tuned by adjusting the cooling rate(R),which is controlled by the thermal spikes of laser ***,we set up a two-step way to locate the critical cooling rate(R_(c))of monoatomic carbon,which is refined by the sharp change in the environmental similarity *** this novel technique,we demonstrate that the ordering degree and the local atomic motif can be largely modified by going across a bar of 100 K/ps,which is extracted as the critical cooling rate to ensure the complete amorphization of *** approach provides a criterion for both experimentally processing and theoretically simulating a-C ***,this work provides guidelines on how to tune the amorphous carbon structures of engineering materials and provides an outlook for the wonderland of amorphous carbon materials.

关键词： molecular dynamics(MD) structural order carbon fibers(Cf) vitrification critical cooling rate(R_(c))

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

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：