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86篇 您的检索式:作者名="SHIQING XU"
    题名 作者 年代 出处 被引量
1Improvement of wheat drought and salt tolerance by expression of a stress- inducible transcription factorGmDREB of soybean (Glycinemax)显示文摘Under stress conditions such as droughthigh-salinity and low-temperature, the transcription factorof DREB (dehydration responsive element binding proteins)improved efficiently stress resistance by regulating the ex-pression of its downstream genes with various environmentastress resistance in plants. GmDREB gene (GenBank Acces-sion No. AF514908) encoding a stress-inducible transcriptionfactor was cloned by screening a cDNA library of Glycinemax cv. Jinong 27 with yeast one-hybrid method. GmDREBgene was 910 bp in length and encoded 174 amino acids con-taining a conserved AP2/EREBP DNA-binding domain of 58amino acids. Two conserved functional amino acids, valineand glutamic acid, were located on the 14th and the 19thamino acid residues in the conserved structural domain. Analkaline amino acid region (KKR) related to a nuclear local-ization signal was at the N-terminal, while an acidic aminoacid region (DDD) related to trans-activation was at theC-terminal. Plant expression vectors were constructed andtransformed into wheat by bombardment. In total, 13 trans-genic plants with Ubi::GmDREB and 11 transgenic plantswith rd29A::GmDREB were identified from 103 regenerationplants by molecular analysis. The drought and salt tolerancesof T1 transgenic lines with Ubi::GmDREB orrd29A::GmDREB were demonstrated to be improved ascompared to wild type. The result also suggested that bothUbiquitin and rd29A promoters could effectively drive theexpression of the GmDREB gene and enhance drought andsalt tolerance of T1 plants.GAO Shiqing XU Huijun CHENG Xianguo CHEN Ming XU Zhaoshi LI Liancheng YE Xingguo DU Lipu HAO Xiaoyan MA Youzhi 2005Chinese Science Bulletin2005,50,23:30
2Estimation of water balance in the source region of the Yellow River based on GRACE satellite data显示文摘Water storage has important significance for understanding water cycles of global and local domains and for monitoring climate and environmental changes.As a key variable in hydrology,water storage change represents the sum of precipitation,evaporation,surface runoff,soil water and groundwater exchanges.Water storage change data during the period of 2003-2008 for the source region of the Yellow River were collected from Gravity Recovery and Climate Experiment(GRACE)satellite data.The monthly actual evaporation was estimated according to the water balance equation.The simulated actual evaporation was significantly consistent and correlative with not only the observed pan(20 cm)data,but also the simulated results of the version 2 of Simple Biosphere model.The average annual evaporation of the Tangnaihai Basin was 506.4 mm,where evaporation in spring,summer,autumn and winter was 130.9 mm,275.2 mm,74.3 mm and 26.1 mm,and accounted for 25.8%,54.3%,14.7% and 5.2% of the average annual evaporation,respectively.The precipitation increased slightly and the actual evaporation showed an obvious decrease.The water storage change of the source region of the Yellow River displayed an increase of 0.51 mm per month from 2003 to 2008,which indicated that the storage capacity has significantly increased,probably caused by the degradation of permafrost and the increase of the thickness of active layers.The decline of actual evaporation and the increase of water storage capacity resulted in the increase of river runoff.Min XU BaiSheng YE QiuDong ZHAO ShiQing ZHANG Jiang WANG 2013Journal of Arid Land2013,5,3:8
3Doping bioactive elements into a collagen scaffold based on synchronous self-assembly/mineralization for bone tissue engineering显示文摘Pure collagen is biocompatible but lacks inherent osteoinductive,osteoimmunomodulatory and antibacterial activities.To obtain collagen with these characteristics,we developed a novel methodology of doping bioactive elements into collagen through the synchronous self-assembly/mineralization(SSM)of collagen.In the SSM model,amorphous mineral nanoparticles(AMN)(amorphous SrCO3,amorphous Ag3PO4,etc.)stabilized by the polyampholyte,carboxymethyl chitosan(CMC),and collagen molecules were the primary components under acidic conditions.As the pH gradually increased,intrafibrillar mineralization occurred via the self-adaptive interaction between the AMNs and the collagen microfibrils,which were self-assembling;the AMNs wrapped around the microfibrils became situated in the gap zones of collagen and finally transformed into crystals.Srdoped collagen scaffolds(Sr-CS)promoted in vitro cell proliferation and osteogenic differentiation of rat bone marrow mesenchymal stromal cells(rBMSCs)and synergistically improved osteogenesis of rBMSCs by altering the macrophage response.Ag-doped collagen scaffolds(Ag-CS)exhibited in vitro antibacterial effects on S.aureus,as well as cell/tissue compatibility.Moreover,Sr-CS implanted into the calvarial defect of a rat resulted in improved bone regeneration.Therefore,the SSM model is a de novo synthetic strategy for doping bioactive elements into collagen,and can be used to fabricate multifunctional collagen scaffolds to meet the clinical challenges of encouraging osteogenesis,boosting the immune response and fighting severe infection in bone defects.Huanhuan Liu Mingli Lin Xue Liu Ye Zhang Yuyu Luo Yanyun Pang Haitao Chen Dongwang Zhu Xue Zhong Shiqing Ma Yanhong Zhao Qiang Yang Xu Zhang 2020Bioactive Materials2020,5,4:6
4In situ trapped high-density single metal atoms within graphene: Iron-containing hybrids as representatives for efficient oxygen reduction显示文摘因为他们为特殊催化作用的效率和 chemoselectivity 比传统的催化剂的那些优异,原子地驱散的催化剂在精力变换应用吸引了注意。然而,他们在支持上由于极其低的装载金属的内容有限制,在在高温度的金属地点和数量以及低稳定性的精确控制的困难。我们经由葡萄糖, dicyandiamide,和无机的金属盐的单个步的热热分解准备了一个高度做的单个金属原子混血儿。高角度的环形的黑暗扫描地的传播电子显微镜学(HAADF 茎) 和 X 光检查吸收罚款结构光谱学(XAFS ) 表明做进 graphene 矩阵的氮原子为由产生 metal-Nx 协作结构的金属原子稳定是枢轴的。由于 graphene 矩阵的强壮的抛锚效果,装载内容的金属是在孤立的原子混血儿的超过 4 wt.%( 磅内容象在做磅的混血儿的 9.26 wt.% 一样高) 。而且,单个做铁的混血儿(做 Fe@N 的 graphene ) 为氧减小反应显示出显著 electrocatalytic 表演。山峰力量密度是 199Daobin Liu Chuanqiang Wu Shuangming Chen Shiqing Ding Yaofeng Xie Changda Wang Tao Wang Yasir A. Haleem Zia ur Rehman Yuan Sang Qin Liu Xusheng Zheng Yu Wang Binghui Ge Hangxun Xu Li Song 2018Nano Research2018,11,4:6
5Effect of Li+ ion concentration on upconversion emission and temperature sensing behavior of La2O3:Er3+ phosphors显示文摘The effects of Li^+ co-doping concentration on the structure, upconversion luminescence and temperature sensing behavior of Er^(3+):La_2O_3 phosphors were investigated. X-ray diffraction and scanning electron microscopy observations reveal that Li^+ ion co-doping can change the lattice parameter of La_2O_3 host and increase the particle size of the samples. The optical investigation shows that co-doping of Li^+ ions can enhance the upconversion emission of Er^(3+) ions in La_2O_3 matrix effectively. Most importantly, the temperature sensing sensitivity of the samples is found to be dependent on Li^+ co-doping concentration,when the emission intensity ratio of the(~2H_(11/2)→~4 I_(15/2)) and(~4 S_(3/2)→~4 I_(15/2)) transitions of Er^(3+) is chosen as the thermometric index. Both of the optimum upconversion luminescence and temperature sensing sensitivity are obtained for 7 mol% Li^+ co-doped sample. When the Li^+ concentration is beyond 7 mol%,both the quenching in upconversion intensity and the degradation of temperature sensitivity are observed, which may be due to the serious distortion in local crystal field around Er^(3+) ions caused by the excess Li^+ ions.Guangrun Chen Ruoshan Lei Shiqing Xu Huanping Wang Shilong Zhao Feifei Huang Yin Tian 2018Journal of Rare Earths2018,36,2:4
6Systematically labeling developmental stage-specific genes for the study of pancreatic β-cell differentiation from human embryonic stem cells显示文摘Haisong Liu Huan Yang Dicong Zhu Xin Sui Juan Li Zhen Liang Lei Xu Zeyu Chen Anzhi Yao Long Zhang Xi Zhang Xing Yi Meng Liu Shiqing Xu Wenjian Zhang Hua Lin Lan Xie Jinning LOU Yong Zhang Jianzhong Xi Hongkui Deng 2014Cell Research2014,24,10:3
7Comparison of clinical outcomes of Chinese men and women after coronary stenting for coronary artery disease:a multi-center retrospective analysis of 4,334 patients显示文摘The outcome differences between Chinese male and female patients within one-year follow-up after percutaneous coronary intervention(PCI) with stent remain unclear.The present study was aimed to compare clinical outcomes in such two populations.From May 1999 to December 2009,4,334 patients with acute myocardial infarction(MI),unstable angina,stable angina,or silent ischemia,who underwent PCI,were registered at our centers.Among these,3,089 were men and 1,245 were women.We compared these groups with respect to the primary outcomes of MI and secondary outcomes including a composite of major adverse cardiac events(MACE) including cardiac death,MI,target lesion revascularization,target vessel revascularization(TVR),stent thrombosis(ST),definite ST and probable ST at one-year follow-up.Chinese male patients had a higher MACE rate(13%vs.10.7%,P =0.039),mainly led by TVR(9.09%vs.6.98%,P=0.024) at one year,which was significantly different than female patients.Chinese male and female patients showed a significant difference on MACEs.However,there was no significant difference with respect to MI between these groups.Rajiv Shrestha Jing Xu Dujiang Xie Zhizhong Liu Tian Xu Fei Ye Shiqing Din Xuesong Qian Song Yang Yueqiang Liu Feng Li Aiping Zhang Shaoliang Chen 2014The Journal of Biomedical Research2014,28,5:3
8Novel lift enhancement method based on zero-mass-flux jets and its adaptive controlling laws design显示文摘For lessening the weight and volume of flow control system,enlarging the circulation control applying area of angle of attack(AOA),and achieving nice controlling characteristics,a novel lift enhancement method based on dual synthetic jet actuators(DSJAs)and synthetic jet actuator(SJA),and an adaptive proportional integral and differential(PID)algorithm based on radial basis function neural network are introduced.DSJAs are uniformly located along the chord to suppress the separation and trailing-edge SJA is applied to achieve the high circulation.Velocities of actuators are modulated to realize the real speed profile and on–off controlling laws of DSJAs are designed.Numerical simulations show that DSJAs and SJA could suppress the separation completely and move leading-edge stagnation point and trailing-edge separation point downstream even at AOA of 19°,hence achieve the highest lift and nose-down moment augmentation(ΔCl_(max)=0.92,ΔCm_(max)=0.02534),andΔL/D can reach 11.39 at AOA of 18°.Stalling is delayed to more than 19°.Linear lift area and pitch-break angle are both increased to 16°.ΔCl/C_(μ) can reach 76.7,indicating the greatest control efficiency.The results of adaptive PID control,whose controlling effects are proved better than PID,indicate that lift could track the objective with the rise time of 0.0325 s and finally keep steady,suggesting the nice stability and rapidness.Zhijie Zhao Zhenbing Luo Bin Xu Xiong Deng Yuyan Guo Wenqiang Peng Shiqing Li 2021Acta Mechanica Sinica2021,37,10:3
9Thermal and luminescent properties of 2 μm emission in thulium-sensitized holmium-doped silicate-germanate glass显示文摘In this paper, we present the luminescent properties of Tm^(3+)∕Ho^(3+)co-doped new glass. A series of silicategermanate glass was prepared by the conventional melt-quenching method. In the Tm^(3+)∕Ho^(3+)co-doped silicategermanate glass, a strong emission of 2 μm originating from the Ho^(3+):~5I_7→~5I_8transition can be observed under conventional 808 nm pumping. The characteristic temperatures, structure, and absorption spectra have been measured. The radiative properties of Ho^(3+)in the prepared glass were calculated. The emission cross section of Ho^(3+)ions transition can reach 4.78 × 10^(-21)cm^2 around 2 μm, and the FWHM is as high as 153 nm. The energy transfer efficiency between Ho^(3+)and Tm^(3+)has a large value(52%), which indicates the Tm^(3+)∕Ho^(3+)co-doped silicategermanate glass is a suitable candidate for the 2 μm laser. Moreover, the energy transfer mechanism between Tm^(3+)and Ho^(3+)ions was investigated.Rong Chen Ying Tian Bingpeng Li Xufeng Jing Junjie Zhang Shiqing Xu Hellmut Eckert Xianghua Zhang 2016Photonics Research2016,4,6:2
10Sintering Behavior and Microwave Dielectric Properties of MgTiO_3 Ceramics Doped with B_2O_3 by Sol-Gel Method显示文摘The B2O3-doped MgTiO3 powders and ceramics have been prepared by sol-gel method using Mg(NO3)2·6H2O, Ti(C4H9O)4 and H3BO3 as the starting materials. The sintering behavior and microwave dielectric properties of ceramics prepared from powders with different particle sizes were investigated. The gels were calcined at 650, 700, 750, 800, 850 and 900 C and the derived particle sizes of powders were 20-30 nm, 30-40 nm, 40-60 nm, 60-90 nm, 90-120 nm and 120-150 nm, respectively. The nanoparticles with the size of 30-60 nm benefited the sintering process with high surface energy whereas nanoparticles with the size of 20-30 nm damaged the microwave dielectric properties due to the pores in the ceramics. The addition of B2O3 used as a liquid sintering aid reduced the sintering temperature of MgTiO3 ceramic, which was supposed to enter the MgTiO3 lattice and resulted in the formation of (MgTi)2(BO3)O phase. The B2O3-doped MgTiO3 ceramic sintered at 1100 C and prepared from the nanoparticles of 40-60 nm had compact structure and exhibited good microwave dielectric properties: εr=17.63, Q × f=33,768 GHz and τ f= 48×10 6 C 1.Huanping Wang Qinghua Yang Denghao Li Lihui Huang Shilong Zhao Shiqing Xu 2012Journal of Materials Science & Technology2012,28,8:2
11Characterization of DNA damage response deficiency in pancreatic cancer patients from China显示文摘To the editor,Pancreatic ductal adenocarcinoma(PDAC)has the worst prognosis among all common malignant solid tumors,with a 5-year overall survival(OS)rate of less than 10%[1].Few effective targets for anticancer ther-apy have been confirmed in pancreatic cancer.Recently,it was substantiated that pancreatic cancer patients carry-ing deleterious mutations of the DNA damage response(DDR)genes are more likely to benefit from platinum-based chemotherapy[2]and poly(adenosine diphosphate-ribose)polymerase(PARP)inhibitor[3].Xiaofei Zhang Tiebo Mao Bei Zhang Haiyan Xu Jiujie Cui Feng Jiao Dongqin Chen Yu Wang Jiong Hu Qing Xia Shumin Li Ming Yue Jingyu Ma Jiayu Yao Yongchao Wang Xiao Zhang Shiqing Chen Yuezong Bai Yuexiang Wang Xuebin Zhang Qiang Liu Yongwei Sun Deliang Fu Yingbin Liu Lei Xiong Liwei Wang 2022Cancer Communications2022,42,1:2
12Spectral and Lasing Properties of Er^(3+0/Yb^(3+) Co-Doped Phosphate Glasses Pumped by LD显示文摘Er~ 3+/Yb~ 3+ phosphate glasses were fabricated. According to McCumber theory, the stimulated emission cross-section of Er~ 3+ ions at 1533 nm was calculated on the basis of absorption spectrum, and 0.84×10~ -20 cm^2 is derived, the fluorescence lifetime of ~4I_ 13/2 level is 8.5 ms. An Er~ 3+/Yb~ 3+ co-doped phosphate glass CW laser pumped by LD was demonstrated at room temperature. The maximum output power is 80 mW and slope efficiency is 16.5%.Zhao Shilong Xu Shiqing Li Shunguang Chen Baoyu Hu Lili 2005Journal of Rare Earths2005,23,5:2
13Prevalence and associated metabolic factors of fatty liver disease in the elderly显示文摘Zhongli Wang Ming Xu Jianhong Peng Li Jiang Zhengguo Hu Hua Wang Shiqing Zhou Rui Zhou Michael Hultstr?m En Yin Lai 2013Experimental Gerontology2013,,8:2
141.3 μm Emission from Nd^(3+)-doped Tellurite Glass Fiber显示文摘1 wt pct Nd2O3-doped tellurite bulk glass and fiber with the same composition of 75TeO2-15ZnO-5Na2O-5Li2O (molfraction, %) were fabricated. Judd-Ofelt analysis was carried out for the bulk. The emission from the 4F3/2→4I13/2 transition in fiber is at 1.33 μm wavelength with a spectral bandwidth of 55 nm, which is similar to that in bulk. In the case of the fiber, the lifetime of 4F3/2 level is 164μs, and the quantum efficiency is ~100%. The figure-of-merit for gain (σoT0) for Nd3+-doped tellurite glass is about 2.8×10-24 cm2.s, which is quite comparable with that in Nd3+-doped fluoroaluminate glasses, and is an order of magnitude larger than pr3+-doped fluoride glasses.Shixun DAI, Junjie ZHANG, Shunguang LI, Jianhu YANG, Shiqing XU, Guonian WANG and Lili HUShanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China 2004Journal of Materials Science & Technology2004,20,6:1
15Preparation and ASE Spectrum of a Single-Mode Erbium Doped Tellurite Glass Fiber with D-type Cladding Geometry显示文摘Based on the host of tellurite glasses, the glass formation, preform manufacture, and fiber fabrication are described. The characterization of amplified spontaneous emission (ASE) from this newly fabricated single-mode Er3+-dopedtellurite fibers is also presented. When pumped at 980 nm, a very broad erbium ASE around 1.53μm was observed. The variations of ASE with fiber length and pumping power are measured and discussed. The output of 2 mW from Er3+-doped tellurite fiber ASE source was obtained under the pump power of 660 mW.Junjie ZHANG, Shixun DAI, Guonian WANG, Shiqing XU, Shunguang LI and Lili HUShanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China 2004Journal of Materials Science & Technology2004,20,6:1
16Study on optical and electrical switching properties and phase transition mechanism of Mo^6+-doped vanadium dioxide thin films显示文摘SHIQING XU HONGPING MA SHIXUN DAI 2004JOURNAL OF MATERIALS SCIENCE2004,39,:1
17Structure and thermal stability of novel fluorophosphate glasses显示文摘SUN Hongtao ZHANG Liyan XU Shiqing 2005J Alloys Comp2005,391,12:1
18Thermal analysis and optical properties of Yb^3+/Er^3+ co-doped oxyfluoride germanate glasses 显示文摘Yang Zhongming Xu Shiqing Hu Lili 2004Journal of Optical Society of America B2004,21,5:1
19Ghrelin prevents doxorubicin-induced cardiotoxicity through TNF-alpha/NF-κB pathways and mitochondrial protective mechanisms显示文摘Zhiwei Xu Shiqing Lin Weikang Wu Hongmei Tan Zhi Wang Chao Cheng Lihe Lu Xuanhong Zhang 2008Toxicology2008,,2:1
20Study of propagation characteristics of plasma surface wave in the medium tube显示文摘WANG Shiqing YAN Zelin LI Wenzhong LIU Jian XU Linfei 2008Plasma Science and Tecnology2008,10,6:1
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