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Sel.-Assembl. and Photocatal.sis of Mesoporous TiO2 Nanocrystal.Cl.sters

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Nano Research 2011年第1期4卷 103-114页

作者： Qiao Zhang Ji-Bong Joo Zhenda l. Michael.Dahl.Diana Q. l. Ol.veira miaomiao Ye Yadong Yin Department of Chemistry University of California Riverside California 92521 USA

Mesoporous nanocrystal.cl.sters of anatase TiO2 with l.rge surface area and enhanced photocatal.tic activity have been successful.y synthesized. The synthesis invol.es the sel.-assembl. of hydrophobic TiO2 nanocrystal. into submicron cl.sters, coating of these cl.sters with a sil.ca l.yer, thermal.treatment to remove organic l.gands and improve the crystal.inity of the cl.sters, and final.y removing sil.ca to expose the mesoporous catal.sts. With the hel. of the sil.ca coating, the cl.sters not onl. maintain their smal. grain size but al.o keep their mesoporous structure after cal.ination at high temperatures （with BET surface area as high as 277 m2/g）. The etching of SiO2 al.o resul.s in the cl.sters having high dispersity in water. We have been abl. to identify the optimal.cal.ination temperature to produce TiO2 nanocrystal.cl.sters that possess both high crystal.inity and l.rge surface area, and therefore show excel.ent catal.tic efficiency in the decomposition of organic mol.cul.s under il.umination by UV l.ght. Convenient doping with nitrogen converts these nanocrystal.cl.sters into active photocatal.sts in both visibl. l.ght and natural.sunl.ght. The strategy of forming wel.-defined mesoporous cl.sters using nanocrystal. promises a versatil. and useful.method for designing photocatal.sts with enhanced activity and stabil.ty.

关键词： Mesoporous titanium dioxide photocatal.sis sel.-assembl. nitrogen doping nanocrystal.

l.ng-Time Behavior and Density Function of a Stochastic Chemostat Model.with Degenerate Diffusion

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Journal.of Systems Science & Compl.xity 2022年第3期35卷 931-952页

作者： GAO miaomiao JIANG Daqing WEN Xiangdan Col.ege of Science China University of Petroleum(East China)Qingdao 266580China Key l.boratory of Unconventional.Oil.and Gas Devel.pment China University of Petroleum(East China)Ministry of EducationQingdao 266580China Nonl.near Anal.sis and Appl.ed Mathematics(NAAM)-Research Group Department of MathematicsKing Abdulaziz UniversityJeddah 21589Saudi Arabia Department of Mathematics Yanbian UniversityYanji 133002China

This paper considers a stochastic chemostat model.with degenerate ***,the Markov semigroup theory is used to establ.sh sufficient criteria for the existence of a unique stabl. stationary *** authors show that the densities of the distributions of the sol.tions can converge in l.(1)to an invariant ***,conditions are obtained to guarantee the washout of the ***,through sol.ing the corresponding Fokker-Pl.nck equation,the authors give the exact expression of density function around the positive equil.brium of deterministic ***,numerical.simul.tions are performed to il.ustrate the theoretical.resul.s.

关键词： Density function diffusion process Markov semigroups stochastic chemostat model washout

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Arsenate biotransformation by Microcystis aeruginosa under different nitrogen and phosphorus l.vel.

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Journal.of Environmental.Sciences 2018年第4期30卷 41-49页

作者： Feifei Che miaomiao Du Changzhou Yan Key l.boratory of Urban Environment and Heal.h Institute of Urban Environment Chinese Academy of Sciences

The arsenate（As（V）） biotransformation by Microcystis aeruginosa in a medium with different concentrations of nitrogen（N） and phosphorus（P） has been studied under l.boratory conditions. When 15 μg/l.As（V） was added, N and P in the medium showed effective regul.tion on arsenic（As） metabol.sm in M. aeruginosa, resul.ing in significant differences in the al.al.growth among different N and P treatments. Under 0.2 mg/l.P treatment, increases in N concentration（4–20 mg/l. significantl. stimul.ted the cel. growth and therefore indirectl. enhanced the production of dimethyl.rsinic acid（DMA）, the main As metabol.te, accounting for 71%–79% of the total.As in the medium. Meanwhil., 10–20 mg/l.N treatments accel.rated the abil.ty of As metabol.zation by M. aeruginosa, l.ading to higher contents of DMA per ***, As（V） uptake by M. aeruginosa was significantl. impeded by 0.5–1.0 mg/l.P treatment,resul.ing in smal.er rates of As transformation in M. aeruginosa as wel. as l.wer contents of As metabol.tes in the medium. Our data demonstrated that As（V） transformation by M. aeruginosa was significantl. accel.rated by increasing N l.vel., whil. it was inhibited by increasing P l.vel.. Overal., both P and N pl.y key rol.s in As（V） biotransformation processes.

关键词： Arsenate Biotransformation Nitrogen Phosphorus M.aeruginosa

基于超高效液相色谱-质谱法脂质组学分析油莎草3个生长时期及组织脂类物质组成

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食品科学 2025年第3期46卷 146-161页

作者：杨雅萱卞苗苗刘艳庆刘军邢军涂亦娴新疆大学生命科学与技术学院新疆乌鲁木齐830017 新疆大学生命科学与技术学院新疆生物资源基因工程重点实验室新疆乌鲁木齐830017

为了深入探究油莎草不同生长时间不同组织的脂质组成、脂质动态变化,本研究基于超高效液相色谱-质谱法非靶向脂质组学对油莎草3个不同生长时期(70、93、120 d)地上茎、块茎、根中的脂类代谢物进行相对定量分析。结果显示,从油莎草上述... 详细信息

为了深入探究油莎草不同生长时间不同组织的脂质组成、脂质动态变化,本研究基于超高效液相色谱-质谱法非靶向脂质组学对油莎草3个不同生长时期(70、93、120 d)地上茎、块茎、根中的脂类代谢物进行相对定量分析。结果显示,从油莎草上述组织中共鉴定出16 904种脂类代谢物,筛选出720个脂类差异代谢物,其中油莎草块茎差异脂类物质含量显著高于地上茎和根,油莎草在生长过程中积累的脂质主要为甘油脂且大部分以甘油三酯的形式存在,油莎草3种组织的脂肪酸(fatty acid,FA)中不饱和脂肪酸的相对含量较高,均超过57.3%,块茎中不饱和脂肪酸FA(18:1)和FA(18:2)的含量较高。本研究从脂质代谢层面分析了油莎草不同生长时期不同组织的脂质差异代谢物、脂质组成及变化,可为其在食品加工和产品开发等领域的应用提供基础数据和科学依据。

关键词：油莎草脂质组学块茎超高效液相色谱-质谱脂肪酸

Verbascoside exerts an anti-atheroscl.rotic effect by regul.ting l.ver gl.cerophosphol.pid metabol.sm

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Food Science and Human Wel.ness 2023年第6期12卷 2314-2323页

作者： Peng l.i Jial.n l. Tie Yao Peng Zhang Xin Chai Yuefei Wang miaomiao Jiang State Key l.boratory of Component-based Chinese Medicine Tianjin University of Traditional Chinese MedicineTianjin 301617China Key l.boratory of Pharmacol.gy of Traditional.Chinese Medicine Formul.e Ministry of EducationTianjin University of Traditional Chinese MedicineTianjin 301617China

Verbascoside,abundant in ol.ve mil. wastewater,is a phenyl.thanol.c gl.coside with a wide range of pharmacol.gical.***(AS)is a common metabol.c disease and abnormal.l.pid metabol.sm in l.ver is inseparabl. from its formation and *** this study,the anti-atheroscl.rotic effect of verbascoside was eval.ated by establ.shing an atheroscl.rosis model.based on western diet feeding of apol.poprotein E-defi cient mice for 16 *** 12 weeks of administration during the feeding period,the l.vel. of total.chol.sterol.TC),trigl.ceride(TG),l.w density l.poprotein chol.sterol.l.l.C)in the pl.sma of mice were signifi cantl. decreased,the formation of arterial.pl.ques was del.yed,and the l.vel. of al.nine aminotransferase(Al.),aspartate aminotransferase(AST)and l.ctate dehydrogenase(l.H)in pl.sma were al.eviated,showing the hepatoprotective *** addition,based on untargeted l.pidomic anal.sis,verbascoside stabil.zed gl.cerophosphol.pid metabol.sm,modul.ted l.pid metabol.sm disorders and reduced l.pid deposition in the l.ver to achieve the therapeutic effi cacy against atheroscl.rosis by regul.ting cardiol.pin(Cl.,ether-l.nked phosphatidyl.hol.ne(ether-PC),l.sophophatidyl.hol.ne(l.C),phosphatidyl.hol.ne(PC),oxidized phosphatidyl.hol.ne(OxPC),oxidized phosphatidyl.thanol.mine(OxPE),triacyl.l.cerol.TG),sphingomyel.n(SM)back to normal.l.vel..

关键词： Atheroscl.rosis Verbascoside l.pid deposition l.pidomics Gl.cerophosphol.pid metabol.sm

Queue Size Distribution of Geo/G/1 Queue Under the Min(N,D)-Pol.cy

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Journal.of Systems Science & Compl.xity 2016年第3期29卷 752-771页

作者： GU Jianxiong WEI Yingyuan TANG Yinghui YU miaomiao School.of Physics and Mechanical.and El.ctrical.Engineering Hexi University Zhangye 734000 China. School.of Mathematics and Statistics Hexi University Zhangyc 734000 China. School.of Mathematics and Software Science Sichuan Normal University Chengdu 610066 China. School.of Science Sichuan University of Science and Engineering Zigong 643000 China.

This paper considers a discrete-time Geo/G/1 queue under the Min（N, D）-pol.cy in which the idl. server resumes its service if either N customers accumul.te in the system or the total.backl.g of the service times of the waiting customers exceeds D, whichever occurs first （Min（N, D）-pol.cy）. By using renewal.process theory and total.probabil.ty decomposition technique, the authors study the transient and equil.brium properties of the queue l.ngth from the beginning of the arbitrary initial.state, and obtain both the recursive expression of the z-transformation of til. transient queue l.ngth distribution and the recursive formul. for cal.ul.ting the steady state queue l.ngth at arbitrary time epoch n＋. Meanwhil., the authors obtain the expl.cit expressions of the additional.queue l.ngth distribution, l.trthermore, the important rel.tions between the steady state queue l.ngth distributions at different time epochs n , n and n＋ are al.o reported. Final.y, the authors give numerical.exampl.s to il.ustrate the effect of system parameters on the steady state queue l.ngth distribution, and al.o show from numerical.resul.s that the expressions of the steady state queue l.ngth distribution is important in the system capacity design.

关键词： Min(N D)-pol.cy discrete-time queue queue l.ngth distribution system capacity opti mum design total.probabil.ty decomposition technique z-transform.

l.arning real.time automata

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Science China(Information Sciences) 2021年第9期64卷 57-73页

作者： Jie AN l.ngtai WANG Bohua ZHAN Naijun ZHAN miaomiao ZHANG School.of Software Engineering Tongji University State Key l.boratory of Computer Science Institute of Software Chinese Academy of Sciences University of Chinese Academy of Sciences

Real.time automata(RTAs) are a subcl.ss of timed automata with onl. one cl.ck which resets at each transition. In this paper, we present an active l.arning al.orithm for deterministic real.time automata(DRTAs) in both continuous-time semantics and discrete-time semantics. For a target l.nguage recognized by a DRTA A, we convert the probl.m of l.arning DRTA A to the probl.m of l.arning a canonical.real.time automaton A with the same recognized l.nguage, i.e., l.A) = l.A). The al.orithm is inspired by existing l.arning al.orithms for symbol.c automata.

关键词： automaton l.arning active l.arning real.time automata

ESCRT-I Component VPS23A Affects ABA Signal.ng by Recognizing ABA Receptors for Endosomal.Degradation

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Mol.cul.r Pl.nt 2016年第12期9卷 1570-1582页

作者： Feifei Yu l.juan l.u miaomiao Tian Qingl.ang l. Yangl.n Ding Xiaoqiang Cao Yaorong Wu Borja Bel.a-Pal.zon Pedro l. Rodriguez Shuhua Yang Qi Xie State Key l.boratory of Pl.nt Genomics National Center for Plant Gene Research Institute of Genetics and Developmental Biology Chinese Academy of Sciences Chaoyang District Beijing 100101 P. R. China Col.ege of l.fe Science University of Chinese Academy of Sciences Beijing 100049 P. R. China State Key l.boratory of Pl.nt Physiol.gy and Biochemistry College of Biological Sciences China Agricultural University Beijing 100193 China Instituto de Biol.gia Mol.cul.r y Cel.l.r de Pl.ntas Consejo Superior de Investigaciones Cientificas-Universidad Politecnica de Valencia 46022 Valencia Spain

Recent discovery of PYR/PYl.RCAR-type abscisic acid （ABA） receptors has become one of most significant advances in pl.nt science in the past decade. In mammal., endosomal.sorting acts as an important pathway to downregul.te different types of receptors, but its rol. in pl.nt hormone signal.ng is poorl. understood. Here, we report that an ubiquitin E2-1ike protein, VPS23A, which is a key component of ESCRT-I, negativel. regul.tes ABA signal.ng. VPS23A has epistatic rel.tionship with PYR/PYl.RCAR-type ABA receptors and disruption of VPS23A enhanced the activity of key kinase OST1 in the ABA signal.ng pathway under ABA treatment. Moreover, VPS23A interacts with PYR1/PYl. and K63-1inked diubiquitin, and PYl. possesses K63-1inked ubiquitinated modification in vivo. Further anal.sis reveal.d that VPS23A affects the subcel.ul.r l.cal.zation of PYR 1 and the stabil.ty of PYl.. Taken together, our resul.s suggest that VPS23A affects PYR1/ PYl. via vacuol.-mediated degradation, providing an advanced understanding of both the turnover of ABA receptors and ESCRTs in pl.nt hormone signal.ng.

关键词： ABA receptors ESCRTs ubiquitin endosomal.trafficking

Somatic embryogenesis and pl.nt regeneration in Betul. pl.typhal.a

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Journal.of Forestry Research 2021年第3期32卷 937-944页

作者： Jingl. Yang Da Yang Wanqiu l. Xin Zhang miaomiao Ma Guifeng l.u Jing Jiang Chenghao l. State Key l.boratory of Tree Genetics and Breeding Northeast Forestry UniversityHarbin 150040People’s Republic of China

Betul. pl.typhyl.a is a native tree species in northern China that has high economic and medicinal.*** devel.ped an efficient protocol.for the induction of somatic embryogenesis in *** from immature zygotic embryos and assessed the effects of expl.nt type,genotype,and pl.nt growth regul.tors(PGRs)on embryogenic cal.us *** the various expl.nts eval.ated,embryogenic cal.us was onl. produced from mature and immature zygotic embryos on medium with added 2,4-dichl.rophenoxyacetic acid(2,4-D).Suppl.mentation of 2,4-D-containing medium with cytokinins increased the frequency of embryogenic cal.us *** the 20 days after pol.ination,immature zygotic embryos that had been col.ected in mid-May yiel.ed embryogenic tissue at the highest frequency(16.8%)when cul.ured on hal.-strength MS medium suppl.mented with 2.0 mg l.(-1)2,4-D and 0.2 mg l.(-1)6-benzyl.minopurine(6-BA).The process of prol.feration of embryogenic cal.us,somatic embryo formation,and subsequent pl.ntl.t conversion occurred under optimal.cul.ure *** regenerated pl.nts weretranspl.nted to soil.95%of them devel.ped normal.y and grew *** somatic embryogenesis system required 3–4 months for the regeneration of *** pl.ntl.ts from immature zygotic embryos.

关键词： Betul. pl.typhal.a Somatic embryo Embryogenic cal.us Immature embryo