Chunming Wang

Nanjing Agricultural University, Nan-ching, Jiangsu Sheng, China

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Publications (142)480.74 Total impact

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    ABSTRACT: The bimetallic alloy CuAu nanoparticles (NPs) can produce more photogenerated electrons when compared with single metal Au NPs. Moreover, graphene (Gr) sheets can help the charge separation and slow down the recombination of the electron hole pairs of ZnO. Hence, a novel graphene-based bimetallic alloy-semiconductor catalyst: CuAu–ZnO–Gr nanocomposite is synthesized. Due to the synergistic effect among CuAu NPs, ZnO nanopyramids, and Gr sheets, CuAu–ZnO–Gr behaves an enhanced photocatalytic activity for the photocatalytic degradation of synthetic colorants methyl orange (MO), methylene blue (MB), indigotin (IN), sunset yellow (SY), and tartrazine (TT) under the simulated sunlight irradiation. Furthermore, the apparent rate constants (kapp) of MO, MB, IN, SY, and TT degradation are estimated respectively. In addition, the as-prepared CuAu–ZnO–Gr nanocomposite is characterized by X-ray diffraction, UV–vis spectrum, transmission electron microscopy, energy dispersive X-ray analysis (EDX), and EDX mapping. As a result of the facile synthesis route and the enhanced photocatalytic activity, this new material CuAu–ZnO–Gr can be a promising photocatalyst for the degradation of dyes.
    Journal of Alloys and Compounds 07/2015; 636. DOI:10.1016/j.jallcom.2015.02.159 · 2.73 Impact Factor
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    ABSTRACT: Transition-metal dichalcogenide (TMD) monolayer alloys are a branch of two-dimensional (2D) materials which can have large-range band gap tuning as the composition changes. Synthesis of 2D TMD monolayer alloys with controlled composition as well as controlled domain size and edge structure is of great challenge. In the present work, we report growth of MoS2(1-x)Se2x monolayer alloys (x = 0.41 - 1.00) with controlled morphology and large domain size using physical vapor deposition (PVD). MoS2(1-x)Se2x monolayer alloys with different edge orientations (Mo-zigzag and S/Se-zigzag edge orientations) have been obtained by controlling the deposition temperature. Large domain size of MoS2(1-x)Se2x monolayer alloys (x = 0.41 - 1.00) up to 20 μm have been obtained by tuning the temperature gradient in the deposition zone. Together with previously obtained MoS2(1-x)Se2x monolayer alloys (x = 0 - 0.40), the band gap photoluminescence (PL) is continuously tuned from 1.86 eV (i.e., 665 nm, reached at x = 0.00) to 1.55 eV (i.e., 800 nm, reached at x = 1.00). Additionally, Raman peak splitting was observed in MoS2(1-x)Se2x monolayer alloys. This work provide a way to synthesize MoS2(1-x)Se2x monolayer alloys with different edge orientations, which could be benefit to controlled growth of other 2D materials.
    ACS Nano 06/2015; DOI:10.1021/acsnano.5b02506 · 12.03 Impact Factor
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    ABSTRACT: Rice blast caused by Magnaporthe oryzae poses a major threat to rice production worldwide. The utilization of host resistance (R) genes is considered to be the most effective and economic means to control rice blast. We show here that the japonica landrace Yangmaogu (YMG) displays a broader spectrum of resistance to blast isolates than other previously reported broad spectrum resistant cultivars. Genetic analysis suggested that YMG contains at least three major R genes. One gene, Pi64, which exhibits resistance to indica-sourced isolate CH43 and several other isolates, was mapped to a 43 kb interval on chromosome 1 of YMG. Two ORFs (NBS-1 and NBS-2) encoding nucleotide-binding site and leucine-rich repeat proteins were short-listed as candidate genes for Pi64. Constructs containing each candidate gene were transformed into three susceptible japonica cultivars. Only transformants with NBS-2 conferred resistance to leaf and neck blast, validating that NBS-2 represents the functional Pi64 gene. Pi64 is constitutively expressed at all development stages and in all tissues examined. Pi64 protein is localized in both the cytoplasm and nucleus. Furthermore, introgression of Pi64 into susceptible cultivars via gene transformation and marker-assisted selection conferred high-level and broad-spectrum leaf and neck blast resistance to indica-sourced isolates, demonstrating its potential utility in breeding broad-spectrum resistant rice cultivars.
    Molecular Plant-Microbe Interactions 05/2015; 28(5):558-568. DOI:10.1094/MPMI-11-14-0367-R · 4.46 Impact Factor
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    ABSTRACT: Efficient evolution of hydrogen through electrocatalysis at low overpotentials holds tremendous promise for clean energy. Herein, a highly active and stable MoS2 electrocatalyst is supported on reduced graphene oxide-modified carbon nanotube/polyimide (PI/CNT-RGO) film for hydrogen evolution reaction (HER). The PI/CNT-RGO film allows the intimate growth of MoS2 nanoparticles on its surface. The nanosize and high dispersion of MoS2 nanoparticles provide a vast amount of available edge sites and the coupling of RGO and MoS2 enhances the electron transfer between the edge sites and the substrate, greatly improving the HER activity of PI/CNT-RGO-MoS2 film. The MoS2 with a smaller loading less than 0.04 mg cm−2 on the PI/CNT-RGO film exhibits excellent HER activities with a low overpotential of 0.09 V and large current densities, as well as good stability. The Tafel slope of 61 mV dec−1 reveals the Volmer–Heyrovsky mechanism for HER. Thus, this work paves a potential pathway for designing efficient MoS2-based electrocatalysts for HER.
    Advanced Functional Materials 03/2015; 25(18). DOI:10.1002/adfm.201500194 · 10.44 Impact Factor
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    ABSTRACT: Floral organ identity in plants is controlled by floral homeotic A/B/C/D/E-class genes. In Arabidopsis thaliana, several epigenetic repressors that regulate these floral organ identity genes have been characterized. However, the roles of epigenetic factors in rice floral development have not been explored in detail. Here, we report the identification and functional characterization of a rice epigenetic repressor, DEFORMED FLORAL ORGAN1 (DFO1) gene, which causes abnormal floral morphology when mutated. We isolated dfo1 by mapping, and confirmed its function by rescue experiments, combined with genetic, cytological and molecular biological analysis. We showed that DFO1 is constitutively expressed and encodes a nuclear-localized protein. Mutation of DFO1 causes the ectopic expression of C-class genes in the dfo1-1 mutant, and overexpression of OsMADS58, a C-class gene, phenocopies the dfo1 mutants. In vitro and in vivo experiments demonstrated that DFO1 interacts with the rice polycomb group (PcG) proteins (OsMSI1 and OsiEZ1). Remarkably, trimethylation of histone H3 lysine 27, a mark of epigenetic repression, is significantly reduced on OsMADS58 chromatin in the dfo1-1 mutant. Our results suggest that DFO1 functions in maintaining rice floral organ identity by cooperating with PcG proteins to regulate the H3K27me3-mediated epigenetic repression on OsMADS58. © 2015 The Authors. New Phytologist © 2015 New Phytologist Trust.
    New Phytologist 02/2015; 206(4). DOI:10.1111/nph.13318 · 6.55 Impact Factor
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    ABSTRACT: Based on the excellent properties of dopamine (reduction, self-polymerization and adhesion), we designed a one-step and environment-friendly reduction route to synthesize and simultaneously functionalize polydopamine (PDA)-Ag-reduced graphene oxide (RGO) hybrid. The obtained PDA-Ag-RGO hybrid was characterized by transmission electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, FT-IR and UV-vis analysis. Silver nanoparticles were uniformly dispersed on the surface of RGO sheets and coated with a thin PDA film. The hybrid exhibited good dispersivity in polar solvents (water and acetonitrile). Compared with Ag-RGO hybrid prepared via NaBH4 reduction and commercial Pd/C catalyst, PDA-Ag-RGO hybrid had better catalytic activity for the oxidation of hydroquinone to benzoquinone in the presence of H2O2. Moreover, the hybrid still retained superior catalytic activity over multiple cycles.
    Applied Catalysis B Environmental 11/2014; s 160–161:400–407. DOI:10.1016/j.apcatb.2014.05.042 · 6.01 Impact Factor
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    ABSTRACT: We proposed a facile approach for the synthesis of zinc sulfur-coated poly (3,4-ethylenedioxythiophene)-reduced graphene oxide hybrids film (ZnS-PEDOT-rGO) by using thioacetamide (TAA) as the reducing agent. The ZnS-PEDOT-rGO hybrids film modified glassy carbon-rotating disk electrode (GC-RDE) was then developed for the sensitive simultaneous determination of three deoxyribonucleic acid (DNA) bases: guanine (G), adenine (A), and thymine (T). By cyclic voltammetry (CV), this electrochemical sensor showed a good photoelectronic effect, and the peak currents of G, A, and T increased obviously. Some kinetic parameters were estimated by linear sweep voltammetry (LSV). Under the optimal conditions, the magnified anodic peak currents represented the excellent analytical performance of simultaneous detection of G, A, and T in a wide linear range and low detection limit. This proposed method also has been successfully applied to the assessment of G, A, and T contents in real-life samples, such as herring sperm DNA samples, milk powder and urine sample from human beings, with satisfactory results. The obtained results were also compared to HPLC of analysis for those three DNA bases and no significant differences were found. By the treatment of the experimental data, the electrochemical reaction mechanisms of G, A, and T all involved a two-electron-two-proton-transfer process.
    Sensors and Actuators B Chemical 11/2014; 203:271–281. DOI:10.1016/j.snb.2014.06.135 · 3.84 Impact Factor
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    ABSTRACT: The Au-SnO2/graphenes (GNs)-single-walled carbon nanotubes (SWCNTs) nanocomposite has been prepared through green chemistry methods. This composite material was deliberately designed to combinethe virtues of metal, semiconductor, and carbon materials. Its successful formation has been confirmedby a series of characterizations, such as transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). A new electrode based on this nanocomposite was fabricated and used as a voltammetric sensor for detection of 2-tert- butylhydroquinone (TBHQ) through cyclic voltammetry (CV) and differential pulse voltammetry(DPV) methods. Under optimized conditions, this electrode presents a linear response in a broad concentration range of 5.0 x 10(-8) to 2.3 x 10(-4) M of TBHQ, with its detection limit reaching 5.8 x 10(-8) M. Thissimultaneous broad-range and ultrasensitive detecting capability for TBHQ is, to our best knowledge, better than all the previously reported modified electrodes. The excellent performance is attributed tothe synergistic effects among the constituent nanomaterials (GNs, SWCNTs, SnO2, and Au) and the uniquenanoarchitecture of this nanocomposite. c 2014 Elsevier B. V. All rights reserved.
    Sensors and Actuators B Chemical 11/2014; 203:926-934. DOI:10.1016/j.snb.2014.06.094 · 3.84 Impact Factor
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    ABSTRACT: A novel honokiol electrochemical sensor based on MoS2/graphene nanohybrid was introduced in this work. The hybrid was characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy and X-ray photoelectron spectroscopy. The electrochemical behavior of honokiol on the MoS2/graphene modified glassy carbon electrode was investigated in pH 5.5 phosphate buffer solution by cyclic voltammetry and differential pulse voltammetry. Compared with bare glassy carbon electrode, the proposed electrode showed improved analytical performance characteristics in catalytic redox of honokiol. Under the optimal conditions, the modified electrode showed a linear voltammetric response to the honokiol with a concentration range from1.0×10−9 to 2.5×10-6 mol L-1, and the detection limit (S/N=3) was estimulated at 6.2×10-10 mol L-1. Moreover, the sensor also exhibited good reproducibility and stability, and could be used for the detection of honokiol in pharmaceutical samples.
    Analytical methods 10/2014; DOI:10.1039/C4AY01790K · 1.94 Impact Factor
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    ABSTRACT: A simple and effective approach was demonstrated to synthesize flowerlike Pt nanocrystals on polydopamine (PDA) functionalized reduced oxide graphene (RGO). In-spired by mussels, the PDA/RGO composites were obtained via the reduction of GO nanosheets by dopamine, followed by simultaneous capping by PDA. Then, the synthesis of Pt flowerlike nanocrystals assembled with small elongated nanoparticles on PDA/RGO (Pt(F)-PDA/RGO) was carried out by mixing H2PtCl6 with PDA/RGO in the presence of ascorbic acid under boiling. PDA as a surface-adherent and multifunctional biopolymer played a dual role: dispersing stable RGO into aqueous solution and providing functional groups to bind metal ions and metal nanoparticles. The as-prepared Pt(F)-PDA/RGO catalyst showed considerably improved catalytic activity and stability toward methanol electrooxidation, compared with Pt nanoclusters on PDA/RGO (Pt(C)-PDA/RGO) and Pt nanoparticles on pristine graphene sheets (Pt/RGO). The kinetic characterization of Pt(F)-PDA/RGO was further discussed by cyclic voltammetry. This simple and green approach could be applicable to other metallic nanocrystals as a novel platform in catalysis, fuel cells and biosensors. (C) 2014 The Authors. Published by Elsevier Ltd.
    Electrochimica Acta 10/2014; 142. DOI:10.1016/j.electacta.2014.06.161 · 4.09 Impact Factor
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    ABSTRACT: Diluted magnetic semiconductor ZnMnSe2 has been synthesized on reduced graphene oxide/polyimide (rGO/PI) substrate by a simple electrochemical method. The structure, surface morphology, magnetism and photoelectric property of ZnMnSe2 were examined. For comparison, ZnSe and MnSe were also prepared by electrochemical deposition. Porous structure of ZnMnSe2 was obtained, and the porous structure was consisted of nanosheets. The atomic ratio of Zn, Mn and Se was measured to be 1:1:2 by X-ray photoelectron spectra and energy-dispersive X-ray spectroscopy. The high resolution transmission electron microscopy and X-ray Powder Diffraction pattern confirmed the preferred crystal growth orientation was the (111) direction. The absorption spectrum provided a band gap of 2.4 eV. Open-circuit potential measurement indicated that ZnMnSe2 composite film was a good p-type semiconductor material. The photoelectrical phenomena of ZnSe, MnSe and ZnMnSe2 were observed, and the optoelectronic property of ZnMnSe2 was the best, the potential difference was 0.27 V. Besides, the ZnMnSe2 composite film had prominent magnetism, and it was ferromagnetism material. These results indicated that rGO/PI-ZnMnSe2 composite film by electrochemical deposition was a promising ferromagnetism semiconductor.
    Journal of Alloys and Compounds 10/2014; 609:233–238. DOI:10.1016/j.jallcom.2014.04.178 · 2.73 Impact Factor
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    ABSTRACT: Porous structured Ag-Ag2S/MoS2 composite was synthesized by a facile chemical etching method and tested with respect to its application in hydrogen evolution reaction (HER). Extensive spectroscopic and electrochemical characterizations were performed to investigate the origin of the catalytic activity of this Ag-Ag2S/MoS2 composite and understand the property of this material for HER. During the synthesis process, cysteine (Cys) was used to improve the number of highly catalytic S edges as revealed by a low ratio of Mo to S. The high density of active sites that result from the rough and porous structure surface morphology also contributes to the highly catalytic activity. The catalytic activity for HER increases with the change of material morphology from a relatively complete lamellar structure to the porous structure. The electrochemical stability tests indicate that the catalyst remains highly active throughout prolonged operation. Our enhanced understanding of this highly active hydrogen evolution catalyst may facilitate the development of economical electrochemical hydrogen production systems. (C) 2014 Published by Elsevier Ltd.
    Electrochimica Acta 10/2014; 142:173–181. DOI:10.1016/j.electacta.2014.07.129 · 4.09 Impact Factor
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    ABSTRACT: Jatropha curcas is a new promising bioenergy crop due to the high oil content in its seeds that can be converted into biodiesel. Seed size, a major determinant of Jatropha oil yield, is a target trait for Jatropha breeding. Due to the vital roles of phytohormone auxin in controlling seed and fruit development, we screened key genes in auxin pathway including ARF and IAA families and downstream effectors to identify candidate genes controlling seed size in Jatropha. As a result, JcARF19 was mapped in the major quantitative trait locus (QTL) region and significantly associated with seed length. By using expression QTL (eQTL) analysis to link variants with functional candidate genes, we provided evidences that seed traits were affected by the interaction of JcARF19 and JcIAA9. ARF19 and IAA9, involved in auxin signal transduction, were conserved in higher plants. These data including the single-nucleotide polymorphisms (SNPs) in the two genes could lead to utilization of the genes by integrating favored alleles into elite varieties through marker-assisted selection.
    Functional & Integrative Genomics 09/2014; DOI:10.1007/s10142-014-0400-5 · 2.69 Impact Factor
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    ABSTRACT: Promising catalytic activity of MoSe2 in the hydrogen evolution reaction (HER) is synthesized on a new reduced graphene oxide/polyimide (rGO/PI) substrate by a simple electrochemical method. The MoSe2 nanoparticles have excellent photo-responsive properties; the potential difference could reach 0.45 V with the photo-responsive time just 0.6 s. Furthermore, MoSe2 thin film exhibits superior catalytic activity in the hydrogen evolution reaction (HER). It has a greater cathode current at more positive potential compared to other MoSe2 and MoS2, and the efficiency of H2 evolution is strongly influenced by illumination; this suggests that MoSe2 composite film has good photoelectrocatalysis properties for hydrogen evolution. Besides, both dark and illumination MoSe2 films exhibit extremely high stability in acidic solution as the HER catalytic activity shows no degradation after 100 cycles for two hours. All results indicate that MoSe2–rGO/PI composite film has potential to be a better catalyst for HER.
    Advanced Functional Materials 09/2014; 25(12). DOI:10.1002/adfm.201401814 · 10.44 Impact Factor
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    ABSTRACT: Heading date is a key determinant of regional and seasonal adaptation in rice (Oryza sativa L.). A minor-effect quantitative trait locus (QTL), QTL for D ays t o h eading 12a (qDTH-12a), with unknown genetic action was previously coarsely detected in a recombinant inbred line population. The study reported here was designed to better define the qDTH-12a locus (designated as DTH12) in advanced segregating populations. DTH12 was initially verified in chromosome segment substitution line CSSL84. A CSSL84/Asominori//Asominori BC4F2 population was then developed, and a near-isogenic line (NIL), NIL(DTH12), was subsequently selected from this population using marker-assisted tracking that headed 8 days later than Asominori under long-day (LD) conditions but which was not significantly different in heading date in short-day environments. Using 358 Asominori/NIL(DTH12) F2:3 families grown under LD conditions, we were able to initially map DTH12 to a 26-cM interval between markers InDel12-1 and RM6296. F3 individuals heterozygous for the DTH12 regions were then chosen, and 2,388 F4:5 families were used for fine mapping. DTH12 was finally dissected as a single gene and delimited to a 153-kb genomic region with 32 open reading frames. Compared with Asominori, NIL(DTH12) showed reduced transcription of the florigen genes Heading date 3a and RICE FLOWERING LOCUS T 1, suggesting that DTH12 functions as an up-regulator of florigen genes during floral induction under LD conditions. DTH12 was also found to have an important role in rice adaptation and breeding for precise control of seed maturity. These findings provide a firm basis for cloning this minor-effect QTL involved in rice flowering.
    Molecular Breeding 08/2014; 34(2):311-322. DOI:10.1007/s11032-014-0035-1 · 2.28 Impact Factor
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    ABSTRACT: Platinum nanoparticles were synthesized with molybdenum disulfide (MoS2) as a template through a facile hydrothermal method. The as-prepared nanocomposites (Pt-MoS2) were characterized by TEM, HRTEM, electrochemical impedance spectroscopy, and X-ray photoelectron spectroscopy, and they were then used to fabricate a biosensor for enzyme-like catalysis of hydrogen peroxide (H2O2). The electrochemical activity for the reduction reactions of H2O2 was evaluated in N2-saturated phosphate buffer solution. The cyclic voltammetry and amperometry results demonstrated that the biosensor modified by the nanocomposites exhibited a fast amperometric response and excellent electrocatalytic activity for reduction of H2O2 with a wide linear range from 0.004 to 48.5 mM and a low detection limit of 0.001 mM at 3σ. Thus, the present work indicates that Pt nanoparticles can be synthesized on the surface of few-layer MoS2 owing to interfacial PtS bonds and that the composites show a clear enhancement in the catalytic activity relative to that of the platinum nanoparticles alone. This method provides a new way to prepare metal nanoparticles for extensive applications in the field of catalysis.
    ChemCatChem 07/2014; 6(7). DOI:10.1002/cctc.201400051 · 5.04 Impact Factor
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    ABSTRACT: MoS2-carbon composites which with different morphologies were synthesized by hydrothermal method and tested with respect to their application in hydrogen evolution reaction (HER). Their performances were compared to evaluate how the morphology influence HER. The obtained results showed that the composite containing amorphous MoS2 showed higher activity than composite which contains crystalline MoS2. The catalytic activity of composite was highly correlated to its active surface area which was controlled by the morphology. In addition, compared with composite which contains amorphous MoS2, the composite containing crystalline MoS2 showed higher durability in the long-term operation. However, in acidic and alkaline environments, the stability of composite containing amorphous MoS2 is better than which containing crystalline MoS2. The impedance measurements suggested that the high catalytic activity of the composite stems from the synergistic effect of MoS2 and carbon materials. The enhanced understanding of these highly active hydrogen evolution catalysts can facilitate the development of economical electrochemical hydrogen production systems.
    International Journal of Hydrogen Energy 06/2014; 39(18):9638–9650. DOI:10.1016/j.ijhydene.2014.04.092 · 2.93 Impact Factor
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    ABSTRACT: Mutation of the AM1 gene causes an albino midrib phenotype and enhances tolerance to drought in rice K(+) efflux antiporter (KEA) genes encode putative potassium efflux antiporters that are mainly located in plastid-containing organisms, ranging from lower green algae to higher flowering plants. However, little genetic evidence has been provided on the functions of KEA in chloroplast development. In this study, we isolated a rice mutant, albino midrib 1 (am1), with green- and white-variegation in the first few leaves, and albino midrib phenotype in older tissues. We found that AM1 encoded a putative KEA in chloroplast. AM1 was highly expressed in leaves, while lowly in roots. Chloroplast gene expression and proteins accumulation were affected during chlorophyll biosynthesis and photosynthesis in am1 mutants. Interestingly, AM1 was induced by salt and PEG, and am1 showed enhanced sensitivity to salinity in seed germination and increased tolerance to drought. Taken together, we concluded that KEAs were involved in chloroplast development and played important roles in drought tolerance.
    Plant Cell Reports 06/2014; 33(9). DOI:10.1007/s00299-014-1639-y · 2.94 Impact Factor

Publication Stats

2k Citations
480.74 Total Impact Points

Institutions

  • 2004–2015
    • Nanjing Agricultural University
      • • State Key Laboratory of Crop Genetics and Germplasm Enhancement
      • • National Key Laboratory of Crop Genetics and Germplasm Enhancement
      Nan-ching, Jiangsu Sheng, China
  • 2002–2015
    • Lanzhou University
      • • State Key Laboratory of Applied and Organic Chemistry
      • • School of Pharmacy
      Kao-lan-hsien, Gansu Sheng, China
  • 2013
    • University of California, San Diego
      • Department of Nanoengineering
      San Diego, CA, United States
  • 2006
    • State Key Laboratory of Medical Genetics of China
      Ch’ang-sha-shih, Hunan, China