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Physicochemical characterization of Baizhi particles by ultrafine pulverization

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International Journal of Minerals,Metallurgy and Materials 2011年第2期18卷 247-251页

作者： Lian-wei yang Peng Sun Guo-sheng Gai Yu-fen yang Yu-rong Wang Department of Material Science and Technology Tsinghna University Beijing 100084 China Department of Material Science and Technology Northeastern University at Qinhuangdao Branch Qinlauangdao 066004 China School of Chinese Pharmacy Beijing University of Chinese Medicine Beijing 100029 China

Baizhi, as a medicinal plant, has been demonstrated to be useful for the treatment of aches and pains in China. The physicochemical characterization of Baizhi particles is greatly influenced by ultrafine pulverization. To study the physicochemical characterization of Baizhi, the raw plant material of Baizhi was ground to 6 μm particles by a high speed centrifugal sheering （HSCS） pulverizer. The micron particles were characterized by optical microscopy and scanning electron microscopy （SEM）. Imperatorin is one of the active ingredients of Baizhi, and its extraction yield is determined to evaluate the chemical characterization of Baizhi powder. Imperatorin was analyzed by high performance liquid chromatography （HPLC）. The results show that after ultrafine pulverization, the plant cell walls are broken into pieces and the extraction yield of imperatorin is increased by 11.93% compared with the normal particles.

关键词： Baizhi physicochemical characterization pulverization imperatorin extraction

Viscosity Solutions to a Parabolic Inhomogeneous Equation Associated with Infinity Laplacian

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Acta Mathematica Sinica,English Series 2015年第2期31卷 255-271页

作者： Fang LIU Xiao Ping yang Department of Applied Mathematics School of Science Nanjing University of Science & Technology

We obtain the existence and uniqueness results of viscosity solutions to the initial and boundary value problem for a nonlinear degenerate and singular parabolic inhomogeneous equation of the form ut-△ ∞N u=f, wher... 详细信息

关键词： Parabolic equation infinity Laplacian viscosity solution inhomogeneous equation comparison principle existence

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Solvable D_2-Groups

Acta Mathematica Sinica,English Series 2017年第1期33卷 77-95页

作者： yang LIU Zi Qun LU School of Mathematical Science Tianjin Normal University Department of Mathematics Tsinghua University

Let G be a finite group, Irra（G） be the set of nonlinear irreducible characters of G and cdl （G） the set of degrees of the characters in Irrl （G）. A group G is said to be a D2-group if │cdl （G）│ = │Irrl（G... 详细信息

关键词： Character degree degree multiplicity solvable group

UNIQUENESS PROBLEM FOR SPDES FROM POPULATION MODELS

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Acta Mathematica Scientia 2019年第3期39卷 845-856页

作者： Jie XIONG Xu yang Department of Mathematicss Southern University of Science and TechnologyShenzhen 518055China School of Mathematics and Information Science North Minzu UniversityYinchuan 750021China

This is a survey on the strong uniqueness of the solutions to stochastic partial differential equations(SPDEs) related to two measure-valued processes: superprocess and Fleming-Viot process which are given as rescaling limits of population biology models. We summarize recent results for Konno-Shiga-Reimers’ and Mytnik’s SPDEs, and their related distribution-function-valued SPDEs.

关键词： Stochastic partial differential equation superprocess Fleming-Viot process distribution function backward doubly stochastic differential equation pathwise uniqueness

Applications of pillarenes, an emerging class of synthetic macrocycles

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Science China Chemistry 2014年第9期57卷 1185-1198页

作者： SONG Nan yang Ying-Wei State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin University

Synthetic macrocycles, a typical type of building block for molecular recognition and self-assembly, are crucial to supramolecular chemistry and materials science. Since 2008, a new generation of synthetic macrocyclic hosts, pillarenes and their abundant derivatives, which consist of hydroquinone units linked by methylene bridges at 2,5-positions, have been the focus of much research. Numerous studies on their host-guest properties and the fabrication of supramolecular assemblies have demon- strated that pillarenes and their derivatives possess many advantages that facilitate their applications in many research fields. Herein we summarize and classitfy the applications of pillarenes in terms of artificial transmembrane channels, controlled delivery systems, dispersion of carbon hybrid materials, extraction and absorption, liquid crystals, metal-organic frameworks, sensing and detection, stabilization of nanoparticles （Au/Ag/CdTe）, and other typical biological applications. We also provide an overview of future developments in pillarene chemistry.

关键词： drug delivery host-guest interactions macrocycles pillarenes supramolecular materials

Increasing prevalence of antibiotic resistance genes in manured agricultural soils in northern China

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Frontiers of Environmental Science & Engineering 2020年第1期14卷 43-54页

作者： Nan Wu Weiyu Zhang Shiyu Xie Ming Zeng Haixue Liu Jinghui yang Xinyuan Liu Fan yang College of Engineering and Technology Tianjin Agricultural UniversityTianjin 300384China College of Marine and Environmental Sciences Tianjin University of Science&TechnologyTianjin 300457China Laboratory of Agricultural Analysis Tianjin Agricultural UniversityTianjin 300384China College of Horticulture and Landscape Tianjin Agricultural UniversityTianjin 300384China

Land application of manure tends to result in the dissemination of antibiotic resistance in the *** this study,the influence of long-term manure application on the enrichment of antibiotic resistance genes(ARGs)and mobile genetic elements(MGEs)in agricultural soils was *** the analyzed eight ARGs(tetA,tetW,tetX,sull,sulll,ermF,aac(6')-Ib-cr and blaTEM)and two MGEs(intJJ and Tn916/1545)were detected in both the manured and control soils,with relative abundances ranging from 10^-6 to 10^-2 Compared with the control soil,the relative abundances of ARGs and MGEs in manured soils were enriched 1.0-18.1 fold and 0.6-69.1 fold,***-throughput sequencing analysis suggested that at the phylum level,the bacteria carrying intll and ermF might be mainly affiliated with Proteobacteria and Bacteroides,*** dominant genera carrying intll and ermF cow\d be Pseudomonas and Bacteroides,independent of manure *** analysis revealed that ARGs had strong links with soil physicochemical properties(TC,TN,and OM),heavy metals(Cu,Zn and Pb)and MGEs,indicating that the profile and spread of ARGs might be driven by the combined impacts of multiple *** contrast,soil pH and C/N exhibited no significant relationships with *** findings provide evidence that long-term manure application could enhance the prevalence and stimulate the propagation of antibiotic resistance in agricultural soils.

关键词： Antibiotic resistance Mobile genetic elements Soil Manure Heavy metals

Antibacterial Mechanism of Copper-bearing Antibacterial Stainless Steel against ***

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Journal of Materials Science & Technology 2008年第2期24卷 197-201页

作者： Li NAN Weichao yang Yongqian LIU Hui XU Ying LI Manqi LU Ke yang Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China Graduate School of Chinese Academy of Sciences Beijing 100049 China

A preliminary study was made on the antibacterial mechanism of copper-bearing antibacterial stainless steels against *** through experiments of microbiology such as EDTA （ethylenediaminetetraacetic acid） complexing, DNA smearing and AFM （atomic force microscope） observation. It was measured that the antibacterial stainless steels showed excellent antibacterial functions with antibacterial rate to *** over 99.99%. The antibacterial rate was weak if the bacteria solution was complexed by EDTA, indicating that the copper ions play a dominant role in the antibacterial effect of the antibacterial stainless steels. The electrophoresis experiment did not show the phenomenon of DNA smearing for *** after contacting antibacterial stainless steels, which meant that DNA of *** was not obviously damaged. It was observed by AFM that the morphology of *** changed a lot after contacting antibacterial stainless steels, such as cell walls being seriously changed and lots of contents in the cells being leaked.

关键词： Copper Stainless steel E.coli Antibacterial mechanism

LID-2 is an E3 ubiquitin ligase important for lysosome membrane integrity

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LID-2 is an E3 ubiquitin ligase important for lysosome membr...

TAILORED FINITE CELL METHOD FOR SOLVING HELMHOLTZ EQUATION IN LAYERED HETEROGENEOUS MEDIUM

第五届中国秀丽线虫大会

作者： Tianchao Hao dongfeng Zhao Jinchao Liu Xiaochen Wang National Laboratory of Biomacromolecules CAS Center for Excellence in BiomacromoleculesInstitute of BiophysicsChinese Academy of Sciences College of Life Sciences University of Chinese Academy of Sciences

＜正＞Lysosomes are membrane-bound organelles containing more than 60 acid hydrolases that function in the degradation of macromolecules derived from endocytosis,phagocytosis or autophagy *** rupture of lysosomal membrane causes leakage of luminal hydrolases to the cytosol,resulting in unwanted degradation of cellular components that may lead to cell ***,

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Journal of Computational Mathematics 2012年第4期30卷 381-391页

作者： Zhong-yi Huang Xu yang Department of Mathematical Sciences Tsinghua University Beijing 100084 China Department of Mathematics Courant Institute of Mathematical Sciences New York UniversityNew York NY 10012 USA

In this paper, we propose a tailored finite cell method for the computation of two- dimensional Helmholtz equation in layered heterogeneous medium. The idea underlying the method is to construct a numerical scheme based on a local approximation of the solution to Helmholtz equation. This provides a computational tool of achieving high accuracy with coarse mesh even for large wave number （high frequency）. The stability analysis and error estimates of this method are also proved. We present several numerical results to show its efficiency and accuracy.

关键词： Tailored finite cell method Helmholtz equation Heterogeneous media Som-merfeld condition.