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In Vivo Voltammetric Imaging of Metal Nanoparticle-Catalyzed Single-Cell Electron Transfer by Fermi Level-Responsive Graphene

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Research 2024年第1期2023卷 271-280页

作者： Qing Xia Rui Liu Xueqin chen Zixuan chen jun-Jie Zhu State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023P.R.China Shenzhen Research Institute of Nanjing University Shenzhen 518000P.R.China

Metal nanomaterials can facilitate microbial extracellular electron transfer(EET)in the electrochemically active biofilm.However,the role of nanomaterials/bacteria interaction in this process is still unclear.Here,we reported the single-cell voltammetric imaging of Shewanella oneidensis MR-1 at the single-cell level to elucidate the metal-enhanced EET mechanism in vivo by the Fermi level-responsive graphene electrode.Quantified oxidation currents of~20 fA were observed from single native cells and gold nanoparticle(AuNP)-coated cells in linear sweep voltammetry analysis.On the contrary,the oxidation potential was reduced by up to 100 mV after AuNP modification.It revealed the mechanism of AuNP-catalyzed direct EET decreasing the oxidation barrier between the outer membrane cytochromes and the electrode.Our method offered a promising strategy to understand the nanomaterials/bacteria interaction and guide the rational construction of EET-related microbial fuel cells.

关键词： Fermi voltammetry Electron

Phosphorylated cellulose nanofibers establishing reliable ion-sieving barriers for durable lithium-sulfur batteries

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Journal of Energy Chemistry 2024年第5期92卷 619-628页

作者： Zihao Li Pengsen Qian Hongyang Li He Xiao Jun Chen Gaoran Li School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094JiangsuChina National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials Fuzhou 350108FujianChina

The shuttle effect is among the most characteristic and formidable challenges in the pursuit of high-performance lithium-sulfur(Li-S)batteries.Herein,phosphorylated cellulose nanofibers(pCNF)are intentionally engineered to establish an ion-sieving barrier against polysulfide shuttling and thereby improve battery performance.The phosphorylation,involving the grafting of phosphate groups onto the cellulose backbone,imparts an exceptional electronegativity that repels the polysulfide anions from penetrating through the separator.Moreover,the electrolyte wettability and Li^(+)transfer can be significantly promoted by the polar nature of pCNF and the facile Li^(+)disassociation.As such,rational ion management is realized,contributing to enhanced reversibility in both sulfur and lithium electrochemistry.As a result,Li-S cells equipped with the self-standing pCNF separator demonstrate outstanding long-term cyclability with a minimum fading rate of 0.013%per cycle over 1000 cycles at 1 C,and a decent areal capacity of 5.37 mA h cm^(-2) even under elevated sulfur loading of 5.0 mg cm^(-2) and limited electrolyte of 6.0 mL g^(-1).This work provides a facile and effective pathway toward the well-tamed shuttle effect and highly durable Li-S batteries.

关键词： Lithium-sulfur batteries Cellulose Phosphorylation Ion-sieving Shuttle effect

On Quantitative Sphere Equivalence and Extrapolation Phenomenon

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Acta Mathematica Sinica,English Series 2022年第4期38卷 709-717页

作者： jun Xi chen Qing Jin chenG School of Mathematical Sciences Xiamen UniversityXiamen 361005P.R.China

Let X,Y be Banach spaces.We prove that if their unit spheres S(X)and S(Y)are(α,β)-Hlder homeomorphic for someα,β∈(0,1].Then the unit spheres of Lp[Ω,μ,X)and Lq(Ω,μ,Y)are(min{p/q,α},min{q/p,β})-Hlder homeomorphic for every measure space(Ω,μ)and for every 1≤p,q<∞.In particular,the result yields an interesting application involving extrapolation phenomenon.

关键词： Banach space Hlder equivalence unit sphere Matouek’s extrapolation phenomenon

Conformal biderivations of loop W(a,b)Lie conformal algebra

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Frontiers of Mathematics in China 2022年第6期17卷 1157-1167页

作者： jun ZHAO Liangyun chen Lamei YUAN School of Mathematics and Statistics Northeast Normal UniversityChangchun130024China Department of Mathematics Harbin Institute of TechnologyHarbin150001China

We study conformal biderivations of a Lie conformal algebra.First,we give the definition of a conformal biderivation.Next,we determine the conformal biderivations of loop W(a,b)Lie conformal algebra,loop Virasoro Lie conformal algebra,and Virasoro Lie conformal algebra.Especially,all conformal biderivations on Virasoro Lie conformal algebra are inner conformal biderivations.

关键词： Lie conformal algebras conformal biderivations Virasoro Lie conformal algebra loop Virasoro Lie conformal algebra loop W(a,b)Lie conformal algebra

Genomic analysis of isopentenyltransferase genes and functional characterization of TaIPT8 indicates positive effects of cytokinins on drought tolerance in wheat

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The Crop Journal 2023年第1期11卷 46-56页

作者： Na Wang Jun Chen Yuan Gao Yongbin Zhou Ming chen Zhaoshi Xu Zhengwu Fang Youzhi Ma Hubei Collaborative Innovation Center for Grain Industry/College of Agriculture Yangtze UniversityJingzhou 434000HubeiChina Institute of Crop Sciences Chinese Academy of Agricultural Sciences/National Key Facility for Crop Gene Resources and Genetic ImprovementKey Laboratory of Biology and Genetic Improvement of Triticeae CropsMinistry of AgricultureBeijing 100081China

Cytokinins(CKs)function in plant development and during stress responses,but their role in drought tolerance in wheat is unknown.In the present study,24 isopentenyltransferase(IPT)genes,encoding ratelimiting enzymes in CK biosynthesis were identified in the wheat genome.The chromosomal locations and structures of the genes,protein properties,and phylogenetic relationships were characterized.ATP/ADP TaIPT genes showed tissue-specific expression.TaIPT2,TaIPT7,and TaIPT8 expression was rapidly induced by 0.5–1 h drought treatments,which decreased to low levels after 2 h drought treatment,as did most other TaIPT genes.TaIPT8-5a/5b/5d triple mutants showed decreased levels of tZtype CK under normal and drought conditions and reduced drought tolerance,which,however,did not manifest as phenotype alterations.By contrast,transgenic wheat plants with drought-induced TaIPT8showed increased drought tolerance.Our study provides a foundation for further investigation of TaIPT genes and novel insights into the role of CKs in the drought response of wheat.

关键词： TaIPT Phytohormone Abiotic stress Cytokinin biosynthesis Wheat

Disturbances of affective cognition in mood disorders

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Science China(Life Sciences) 2021年第6期64卷 938-941页

作者： Jun Chen Zuowei Wang Zezhi Li Daihui Peng Yiru Fang Clinical Research Center&Division of Mood Disorders Shanghai Mental Health CenterShanghai Jiao Tong University School of MedicineShanghai 200030China Guangdong-Hong Kong-Macao Greater Bay Area Center for Brain Science and Brain-Inspired Intelligence Guangzhou 510515China Hongkou District Mental Health Center of Shanghai Shanghai 200083China Ren Ji Hospital Shanghai Jiao Tong University School of MedicineShanghai 200127China CAS Center for Excellence in Brain Science and Intelligence Technology Shanghai 200031China Shanghai Key Laboratory of Psychotic Disorders Shanghai 201108China

Mood disorders,also known as affective disorders,result in a consistent disturbance in mood.There are two major subtypes of mood disorders,i.e.,major depressive disorder(MDD)and bipolar disorder(BD).Mood disorders affect hundreds of millions of people and are the most common mental disorders.According to China’s national survey in2009(Phillips et al.,2009),the weighted 12-month prevalence of mental disorders was 17.5%and 9.3%,respectively.Mood disorders were among the highest prevalence rate disorders related to disease’s increased burdens.

关键词： disorders prevalence al.

Nonparametric Estimation for the Diffusion Coefficient of Multidimensional Time-Varying Diffusion Processes

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Journal of Systems Science & Complexity 2020年第5期33卷 1602-1631页

作者： WANG jun chen Ping Department of Science Nanjing University of Science andTechnologyNanjing 210000China

This paper proposes a kernel estimator for the coefficient of multidimensional time-varying diffusion processes as an extension of the estimation model for one dimensional diffusion coefficient to the multidimensional case.By using"time division",the authors overcome the problem of sample observation in time varying model.In addition,the authors prove the strong consistency and limit distribution of the estimator.Finally,the authors test the performance of the estimator through a simulation experiment and an empirical application.

关键词： Asymptotic properties kernel function multidimensional model nonparametric estimation time-inhomogeneous

Target detection method in passive bistatic radar

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Journal of Systems Engineering and Electronics 2020年第3期31卷 510-519页

作者： chen Gang WANG jun National Laboratory of Radar Signal Processing Xidian UniversityXi’an 710071China

Owing to the advantages in detecting the low altitude and stealth target,passive bistatic radar(PBR)has received much attention in surveillance purposes.Due to the uncontrollable characteristic of the transmitted signal,a high level range or Doppler sidelobes may exist in the ambiguity function which will degrade the target detection performance.Mismatched filtering is a common method to deal with the ambiguity sidelobe problem.However,when mismatched filtering is applied,sidelobes cannot be eliminated completely.The residual sidelobes will cause false-alarm when the constant false alarm ratio(CFAR)is applied.To deal with this problem,a new target detection method based on preprocessing is proposed.In this new method,the ambiguity range and Doppler sidelobes are recognized and eliminated by the preprocessing method according to the prior information.CFAR is also employed to obtain the information of the target echo.Simulation results and results on real data illustrate the effectiveness of the proposed method.

关键词： passive bistatic radar(PBR) mismatched filtering ambiguity sidelobe target detection

Supporting future earth with global geospatial information

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International Journal of Digital Earth 2017年第4期10卷 325-327页

作者： Songnian Li Jun Chen Ryerson University TorontoONCanada National Geomatics Center of China BeijingPeoples Republic of China

Future Earth,initiated by the International Council of Science Unions and presented during the Pla-net under Pressure conference held on 26-29 March 2012,is a global research initiative aiming at developing the knowledge for effective response to the risks and opportunities of global environ-mental change and for supporting transformation towards a sustainable world.

关键词： supporting initiated global