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Impact of biosolids,ZnO,ZnO/biosolids on bacterial community and enantioselective transformation of racemic–quizalofop–ethyl in agricultural soil

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Journal of Environmental Sciences 2020年第1期32卷 163-172页

作者： qing zhou Xu Zhang School of Resources and Environmental Science Wuhan University

The effects of biosolids,ZnO,and ZnO/biosolids on soil microorganism and the environmental fate of coexisting racemic–quizalofop–ethyl(rac-QE)were *** biomass carbon in native soil,soil/biosolids decreased by 62%and 52%in the presence of ZnO(2‰,weight ratio).The soil bacterial community structure differed significantly among native soil,soil/biosolids,soil/ZnO,and soil/biosolids/ZnO based on a principal co-ordinate analysis(PCo A)of OTUs and one-way ANOVA test of bacterial *** transformation caused by ZnO only contributed 4%and 3% of the overall transformation of R-quizalofop-ethyl(R-QE)and S-quizalofop-ethyl(S-QE)in soil/*** inhibition effect of ZnO on the initial transformation rate of R-QE(rR-QE)and S-QE(rR-QE)in soil only observed when enantiomer concentration was larger than 10 mg/*** embedded with ZnO(biosolids/ZnO)caused a 17%–42% and 22%–38%decrease of rR-QE and rS-QE,although rR-QE and rS-QE increased by 0%–17% and 22%–58%by the addition of *** results also demonstrated that the effects of biosolids on agricultural soil microorganism and enantioselective transformation of chiral pesticide was altered by the embedded nanoparticles.

关键词： Bacterial structure Biosolids Chirality Enantiomer fraction ZnO

Cooperative Hedging in the Complete Market under g-expectation Constraint

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Acta Mathematicae Applicatae Sinica 2011年第3期27卷 373-380页

作者： qing zhou School of Science Beijing University of Posts and Telecommunications Beijing 100876 China

The paper studies the muiti-agent cooperative hedging problem of contingent claims in the complete market when the g-expected shortfall risks are bounded. We give the optimal cooperative hedging strategy explicitly by... 详细信息

关键词： hedging Neyman Pearson lemma g-probability backward stochastic differential equation

固定-可摘联合义齿对牙周病合并牙列缺损的修复效果

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现代生物医学进展 2016年第17期16卷 3379-3381页

作者：刘鹍鹏李森森张峰李明余周庆恩施州中心医院口腔科湖北恩施445000 武汉科技大学附属天佑医院口腔科湖北武汉430000 武汉大学中南医院口腔科湖北武汉430000

目的:观察固定-可摘联合义齿应用于牙周病伴牙列缺损修复效果,探讨其临床价值。方法:选择本院于2013年1月-2014年1月收治的符合牙周病伴牙列缺损诊断标准60例患者作为研究对象,按照数字法分为两组,每组30例,对照组采取可摘夹板式活动义... 详细信息

目的:观察固定-可摘联合义齿应用于牙周病伴牙列缺损修复效果,探讨其临床价值。方法:选择本院于2013年1月-2014年1月收治的符合牙周病伴牙列缺损诊断标准60例患者作为研究对象,按照数字法分为两组,每组30例,对照组采取可摘夹板式活动义齿修复,观察组给予固定-可摘联合义齿修复,两组患者均随访18个月,比较两组患者疗效。结果:戴义齿18个月观察组咀嚼效率(55.4±3.8),显著高于对照组(50.1±3.6),差异具有统计学意义,P<0.05。观察组临床疗效显著优于对照组,差异具有统计学意义,P<0.05。观察组戴用义齿后基牙拔除情况显著优于对照组,差异具有统计学意义,均P<0.05。结论:固定-可摘联合义齿应用于牙周病伴牙列缺损修复效果较佳,具有重要临床价值。

关键词：固定-可摘联合义齿修复义齿牙周病牙列缺损临床价值

Reflected and Doubly Reflected BSDEs for L'evy Processes:Solutions and Comparison

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Acta Mathematicae Applicatae Sinica 2010年第2期26卷 333-344页

作者： qing zhou School of Science Beijing University of Posts and Telecommunications Beijing 100876 China

In this paper we study reflected and doubly reflected backward stochastic differential equations （BSDEs, for short） driven by Teugels martingales associated with L^vy process satisfying some moment condi- tions and by an independent Brownian motion. For BSDEs with one reflecting barrier, we obtain a comparison theorem using the Tanaka-Meyer formula. For BSDEs with two reflecting barriers, we first prove the existence and uniqueness of the solutions under the Mokobodski＇s condition by using the Snell envelope theory and then we obtain a comparison result.

关键词： Backward stochastic differential equation L^vy process Teugels martingale Comparison theorem,Snell envelope

On Comparison Theorem and Solutions of BSDEs for Lévy Processes

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Acta Mathematicae Applicatae Sinica 2007年第3期23卷 513-522页

作者： qing zhou School of Science Beijing University of Posts and Telecommunications Beijing 100876 China

In this paper, we consider backward stochastic differential equations driven by a Levy process. A comparison theorem and an existence and uniqueness theorem of BSDEs with non-Lipschitz coefficients are obtained.

关键词： Backward stochastic differential equation Comparison theorem

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碱性介质中腐植酸电化学氧化动力学研究

现代化工 2025年第1期45卷 207-213页

作者：冯晴晴何德民范玉强关珺大连理工大学化工学院辽宁大连116024

采用三电极体系的H型隔膜电解池对腐植酸(humic acid,HA)在碱性条件下的电化学氧化过程进行动力学研究,考察了温度、阳极电位、碱液质量浓度对电化学氧化反应的影响。结果表明,HA电化学氧化符合二级反应动力学模型,活化能为19.94 kJ/mol... 详细信息

采用三电极体系的H型隔膜电解池对腐植酸(humic acid,HA)在碱性条件下的电化学氧化过程进行动力学研究,考察了温度、阳极电位、碱液质量浓度对电化学氧化反应的影响。结果表明,HA电化学氧化符合二级反应动力学模型,活化能为19.94 kJ/mol,各反应条件对HA进一步氧化成高附加值的煤酸(CA)有不同程度的影响。对各反应条件下的氧化过程进行分析发现,温度影响分子间键能和双电层充放电速率;阳极电位影响相应的电流密度,进而影响电子转移效率;碱液质量浓度改变溶液的电导性。HA电化学氧化后分子结构发生改变,可为进一步研究煤电化学氧化这一复杂反应提供参考。

关键词：腐植酸碱性电化学氧化动力学反应条件

Application of 2D fluorescence correlation method to investigate the dilution-induced heterogeneous distribution of the bound FMN in azoreductase

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Chinese Chemical Letters 2015年第2期26卷 210-214页

作者： Juan Feng Ting Han Mi-qing Zhang yu zhou qing-Qin Wu School of Life Science and Technology University of Electronic Science and Technology of China

AzoR is a homodimeric,flavin mononucleotide（FMN）-containing,NADH-dependent azoreductase from Escherichia *** this paper,we investigated the effect of the concentration of both AzoR and R59 G on the spectral behavior of the bound FMN using two-dimensional fluorescence correlation *** cross peaks（530,490） and（580,530） were observed from the dilution-induced 2D asynchronous correlation map of wt AzoR,while only one cross peak appeared at（600,530） for R59 C *** result indicated that the mutation at site 59 influenced the formation of dilution-induced *** specific activity of both AzoR and R59 G mutant was unaffected by dilution when the enzyme concentration is below 1 μmol/L,which suggested that no significant dissociation of FMN occurred at low ***,in order to explore the origin of these intermediates,we carried out a2 D correlation analysis using excitation wavelength-dependent fluorescence emission *** results showed that there coexisted two types of FMN that emitted fluorescence at 530 nm and 500 nm,*** together,these results suggested that the 2D method is a very powerful method to identify the heterogeneous distribution of the bound FMN in solution.

关键词： Azoreductase FMN 2D fluorescence correlation spectra Heterogeneous distribution

Inactivation of the positive LuxR-type oligomycin biosynthesis regulators OlmRI and OlmRII increases avermectin production in Streptomyces avermitilis

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Chinese Science Bulletin 2012年第8期57卷 869-876页

作者： yu qing BAI LinQuan zhou XiuFen DENG ZiXin State Key Laboratory of Microbial Metabolism and School of Life Sciences&BiotechnologyShanghai Jiao Tong UniversityShanghai 200030China

Oligomycins are a group of 26 macrocyclic lactones that exhibit broad biological activities,including antifungal,anticancer and nematocidal *** of the oligomycin biosynthetic gene cluster (olm) in *** revealed 2 tandem LuxR-type regulators,OlmRI (931 aa) and OlmRII (941 aa),with shared identity of 38%.Gene replacement of olmRI or olmRII abolished oligomycin production,and this production could be partially restored in the disruptants by introducing cloned olmRI and olmRII with their native promoters,demonstrating the essential role of OlmRI and OlmRII for oligomycin *** real-time RT-PCR analysis revealed that transcription of 14 olm genes was differentially affected by the deletion of olmRI and ***,avermectin production in both mutants was enhanced at least *** identification of the positive cluster-situated regulators,OlmRI and OlmRII,paves the way for the transcriptional analysis of oligomycin biosynthesis and for the enhancement of oligomycin and avermectin production through regulator engineering.

关键词：生物合成基因簇阿维菌素生产监管 R型链霉菌 RT-PCR分析灭活

Mechanical strain triggering flux jumps of multi-filamentary Nb_(3)Sn wires

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Superconductivity 2022年第4期4卷 14-21页

作者： qing-yu Wang Cun Xue You-He zhou School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Mechanics on Disaster and Environment in Western China Attached to the Ministry of Education of China and Department of Mechanics and Engineering Sciences Lanzhou UniversityLanzhou 730000China

The composite multi‐filamentary Nb_(3)Sn wire with a high critical current density is a preferred option for fabricating the superconducting magnet beyond the limit of NbTi wire(9–16 T).However,one crucial issue stems from the fact that electromagnetic force in superconducting coils is very strong,and the critical physical properties of Nb_(3)Sn,such as Jc,are more sensitive to mechanical strain than those of other possible low‐temperature *** theoretically investigated the impact of mechanical strain on the thermomagnetic instabilities such as the flux jump(FJ)and quenching of Nb_(3)Sn wire exposed to a static magnetic field and transport *** good agreements with H formulation or H‐φformulation implemented on COMSOL software confirm the validity of our numerical simulations using home‐made *** is discovered that mechanical strain can trigger flux jumps even in a static magnetic ***,the threshold value of mechanical strain to trigger the first flux jump is a monotonic function of the static magnetic field in the case of high transport currents,while it is a non‐monotonic function in the case of low transport *** is attributed to the fact that flux can be released by the mechanical strain,causing smooth flux penetration before triggering the flux *** also present the stable/unstable regions by applying mechanical strain by varying transport current,magnetic field,and working temperature,which helps in avoiding thermomagnetic instabilities while designing the superconducting magnet.

关键词： Nb_(3)Sn wires Thermomagnetic instability Flux jump Mechanical strain