检索结果-南通市图书馆

Neuroprotection of Cyperus esculentus L. orientin against cerebral ischemia/reperfusion induced brain injury

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

Neural Regeneration Research 2020年第3期15卷 548-556页

作者： Si-Qun jing Sai-Sai Wang Rui-Min Zhong Jun-Yan Zhang jin-Zi Wu Yi-xian Tu Yan pu Liang-Jun Yan Yingdong College of Food Science and Engineering Shaoguan UniversityShaoguanGuangdong ProvinceChina School of Bioengineering Jiangnan UniversityWuxiJiangsu ProvinceChina Department of Pharmaceutical Sciences UNT System College of PharmacyUniversity of North Texas Health Science CenterFort WorthTXUSA College of Life Sciences and Technology Xinjiang UniversityUrumqiXinjiang Uygur Autonomous RegionChina

Orientin is a flavonoid *** recent years,its importance as a source of pharmacological active substance is growing rapidly due to its properties such as anti-myocardial ischemia,anti-apoptosis,anti-radiation,anti-tumor,and ***,the neuroprotective effects of Orientin on stroke injury have not been comprehensively *** aim of the present study was thus to investigate the neuroprotective capacity and the potential mechanisms of Cyperus esculentus ***(CLO)from Cyperus esculentus *** against ischemia/reperfusion(I/R)injury using standard orientin as *** in vitro studies,we treated HT22 cells with CoCl2 as an in vitro ischemic injury ***22 cells in the control group were treated with *** in vivo studies,we used rat models of middle cerebral artery occlusion,and animals that received sham surgery were used as *** found that CLO protected CoCl2-induced HT22 cells against ischemia/reperfusion injury by lowering lipid peroxidation and reactive oxygen species formation as well as decreasing protein ***,CLO did not reduce the release of lactate dehydrogenase nor increase the activity of superoxide *** showed that CLO could decrease neurological deficit score,attenuate brain water content,and reduce cerebral infarct volume,leading to neuroprotection during cerebral ischemia-reperfusion *** studies indicate that CLO flavonoids can be taken as a natural antioxidant and bacteriostastic substance in food and pharmaceutical *** molecular mechanisms of CLO could be at least partially attributed to the antioxidant properties and subsequently inhibiting activation of *** experimental procedures and protocols were approved on May 16,2016 by the Experimental Animal Ethics Committee of Xinjiang Medical University of China(approval ***20160516-57).

关键词： antioxidants caspase-3 cerebral ischemia/reperfusion injury cobalt chloride Cyperus esculentus L.orientin(CLO) lipid peroxidation nerve regeneration neurological deficits oxidative stress reactive oxygen species

Power Series Expansion of Propagator for Path Integral and Its Applications

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第5X期48卷 819-822页

作者： OU Yuan-jin LIANG xian-Ting Department of Physics and Institute of Modern Physics Ningbo University Ningbo 315211 China

In this paper we obtain a propagator of path integral for a harmonic oscillator and a driven harmonic oscillator by using the power series expansion. It is shown that our result for the harmonic oscillator is more exact than the previous one obtained with other approximation methods. By using the same method, we obtain a propagator of path integral for the driven harmonic oscillator, which does not have any exact expansion. The more exact propagators may improve the path integral results for these systems.

关键词： harmonic oscillator path integration propagator

r-Matrix Structure for a Restricted Flow with Bargmann Constraint

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2005年第3X期44卷 393-395页

作者： CHEN jin-Bing GENG xian-Guo Department of Mathematics Zhengzhou University Zhengzhou 450052 China

This paper deals with the integrability of a finite-dimensional Hamiltonian system linked with the generalized coupled KdV hierarchy. For this purpose the associated Lax representation is presented after an elementary calculation. It is shown that the Lax representation enjoys a dynamical r-matrix formula instead of a classical one in the Poisson bracket on R2N. Consequently the resulting system is proved to be completely integrable in view of its r-matrix structure.

关键词： Poisson bracket Lax representation r-matrix Liouville integrability

A Micro-Mechanism Model for Porous Media

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2009年第11期52卷 936-940页

作者： WU jin-Sui YIN Shang-xian Department of Basic Teaching North China University of Science and Technology Beijing 101601 China Faculty of Safety Engineering North China University of Science and Technology Beijing 101601 China

Based on the tortuous-expanding path/channel model,a micro-mechanism model for porous media is *** proposed model is expressed as a function of tortuosity,porosity,resistance coefficient,and fluid *** parameter in the proposed model has clear physical *** results show that the model predictions are ingood agreement with those from the existing experimental data.

关键词： resistance porous media micro-mechanism model

Directional quantum random walk induced by coherence

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2020年第2期15卷 13-25页

作者： jin-Fu Chen Yu-Han Ma Chang-pu Sun Beijing Computational Science Research Center Beijing 100193China Graduate School of China Academy of Engineering Physics No.10 Xibeiwang East RoadHaidian DistrictBeijing 100193China

Quantum walk (QW), which is considered as the quantum counterpart of the classical random walk (CRW), is actually the quantum extension of CRW from the single-coin interpretation. The sequential unitary evolution engenders correlation between different steps in QW and leads to a non-binomial position distribution. In this paper, we propose an alternative quantum extension of CRW from the ensemble interpretation, named quantum random walk (QRW), where the walker has many unrelated coins, modeled as two-level systems, initially prepared in the same state. We calculate the walker's position distribution in QRW for different initial coin states with the coin operator chosen as Hadamard matrix. In one-dimensional case, the walker's position is the asymmetric binomial distribution. We further demonstrate that in QRW, coherence leads the walker to perform directional movement. For an initially decoherenced coin state, the walker's position distribution is exactly the same as that of CRW. Moreover, we study QRW in 2D lattice, where the coherence plays a more diversified role in the walker's position distribution.

关键词： quantum walk random walk ensemble interpretation directional walking coherence

Development status of high power fiber lasers and their coherent beam combination

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

Science China(Information Sciences) 2019年第4期62卷 56-87页

作者： Zejin LIU Xiaoxi jin Rongtao SU Pengfei MA pu ZHOU College of Advanced Interdisciplinary Studies National University of Defense Technology

High-power fiber laser has been emerged great potential in a wide range of applications and becomes a robust candidate for high energy solid state laser system. To further increase the output brightness of single-channel fiber laser, high-brightness pump sources and high-power-handling passive components should be fabricated and utilized in the fiber laser systems, in addition to the advanced techniques for multiple nonlinear effects managements. The state-of-the-art high power fiber lasers are reviewed, in terms of narrow-linewidth fiber lasers, broadband fiber lasers and fiber lasers at 2 μm. Coherent beam combining is a promising technique to obtain higher output power while maintaining excellent beam quality simultaneously,which breaks through the bottlenecks of single-channel fiber laser. Based on a series of key techniques for coherent beam combining, high-power coherent beam combining of fiber lasers could be enabled with high combining efficiency. In this paper, we review the progress of high-power fiber lasers and their coherent beam combining in the recent decade, particularly the relevant work in our group. The future prospects of fiber lasers and coherent beam combining technique are also discussed.

关键词： fiber lasers and amplifiers nonlinear effects and mode instability coherent beam combining passive components 2 μm fiber lasers

Identification and Analyses of miRNA Genes in Allotetraploid Gossypium hirsutum Fiber Cells Based on the Sequenced Diploid *** Genome

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 Genetics and Genomics 2012年第7期39卷 351-360页

作者： Qin Li xiang jin Yu-xian Zhu The State Key Laboratory of Protein and Plant Gene Research College of Life SciencesPeking UniversityBeijing 100871China National Center for Plant Gene Research(Beijing) Beijing 100101China

The plant genome possesses a large number of microRNAs （miRNAs） mainly 21-24 nucleotides in length. They play a vital role in regulation of target gene expression at various stages throughout the whole plant life cycle. Here we sequenced and analyzed ~ 10 million non-coding RNAs （ncRNAs） derived from fiber tissue of the allotetraploid cotton （Gossypium hirsutum） 7 days post-anthesis using ncRNA-seq technology. In terms of distinct reads, 24 nt ncRNA is by far the dominant species, followed by 21 nt and 23 nt ncRNAs. Using ab initio prediction, we identified and characterized a total of 562 candidate miRNA gene loci on the recently assembled D5 genome of the diploid cotton G. raimondii. Of all the 562 predicted miRNAs, 22 were previously discovered in cotton species and 187 had sequence conservation and homology to homologous miRNAs of other plant species. Nucleotide bias analysis showed that the 9th and 1st positions were significantly conserved among different types of miRNA genes. Among the 463 putative miRNA target genes, most significant up/down-regulation occurred in 10-20 days post-anthesis, indicating that miRNAs played an important role during the elongation and secondary cell wall synthesis stages of cotton fiber development. The discovery of new miRNA genes will help understand the mechanisms of miRNA generation and regulation in cotton.

关键词： Cotton Genome Micro RNA Deep sequencing Microarray

Elimination of Surfactants and Small Dyes from Water with Silicasupported Dendritic Amphiphiles

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2016年第1期34卷 59-68页

作者： Feng Chen 万德成 Ming jin Hong-ting pu Institute of Functional Polymers School of Materials Science and EngineeringTongji UniversityShanghai 201804China Key Laboratory of Advanced Civil Engineering Materials(Tongji University) Ministry of EducationShanghai 201804China

Silica-supported branched polyethylenimine（Sil@PEI） is a conventional adsorbent and shows a limited affinity to anionic surfactants and small dyes（K = 106？107 L/mol）. If the PEI is alkylated with cetyl groups（C16）, the K of the resulting adsorbents（Sil@PEI@C16-x, where x is the fraction of PEI units being alkylated） is significantly improved. Optimization shows that Sil@PEI@C16-0.15 can best reduce aqueous surfactants to a residue around 10？10 mol/L; while Sil@PEI@C16-0.6 can reduce even small aqueous dyes to a residue below 10？10 mol/L, nearly 105-fold lower than that by Sil@PEI. The adsorbents are well recyclable. It is believed that in the case of dyes, the dense cetyl shell can isolate the PEI from the bulky water and thus suppress the competitive binding by water; while in the case of surfactants, the semiclosed cetyl shell can simultaneously meet electrostatic complement and hydrophobic complement to the surfactants.

关键词： Dendritic amphiphile Water treatment Adsorbent Micropollutant Support

Structures of sodium vanadate solution under different conditions

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2018年第1期37卷 59-65页

作者： Ya-Li Zhang Li-Qun Yang xian-jin Yu School of Chemical Engineering Shandong University of Technology

Combined with Fourier transform infrared spectroscopy（FTIR） analysis of sodium vanadate solution,the relationship between conductivity and structure was investigated by measuring the electric conductivity of the solution under different alkali concentrations and molar ratios of NaOH to V2O5. Results suggest that the polymerization vanadium acid radical ions gradually transform into monomer with the solution diluting. When the solution is diluted to a certain extent,only the vanadium acid radical ion with V-OH chemical bond exists in the solution. At NaOH concentration of below 105.21 g·L^（-1）,the vanadate anions mainly exist in the form of vanadium acid radical ion with V-OH chemical bond and the ion transference number is approximately from 0.58 to 0.82. In the medium NaOH concentration range of 105.21-117.03 g·L^（-1）, the vanadate anions mostly exist in the form of vanadium acid radical ion with V-OH and V-O-V chemical bonds and the ion transference number is approximately 3.29. At NaOH concentration of above 117.03 g·L^（-1）, vanadate anions exist in the form of vanadium acid radical ion with V-OH and V-O-V chemical bonds.

关键词： Sodium vanadate solution Electric conductivity Migration number Infrared spectroscopy