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Microscopy and Bioinformatic Analyses of Lipid Metabolism Implicate a Sporophytic Signaling Network Supporting Pollen Development in Arabidopsis

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Molecular Plant 2008年第4期1卷 667-674页

作者： yixing wang Hong Wu ming yang Department of Botany Oklahoma State University 104 Life Sciences East Stillwater OK 74078 USA College of Life Sciences South China Agricultural University Guangzhou 510642 China

The Arabidopsis sporophytic tapetum undergoes a programmed degeneration process to secrete lipid and other materials to support pollen development. However, the molecular mechanism regulating the degeneration process is unknown. To gain insight into this molecular mechanism, we first determined that the most critical period for tapetal secretion to support pollen development is from the vacuolate microspore stage to the early binucleate pollen stage. We then analyzed the expression of enzymes responsible for lipid biosynthesis and degradation with available in-silico data. The genes for these enzymes that are expressed in the stamen but not in the concurrent uninucleate microspore and binucleate pollen are of particular interest, as they presumably hold the clues to unique molecular processes in the sporophytic tissues compared to the gametophytic tissue. No gene for lipid biosynthesis but a single gene encoding a patatin- like protein likely for lipid mobilization was identified based on the selection criterion. A search for genes co-expressed with this gene identified additional genes encoding typical signal transduction components such as a leucine-rich repeat receptor kinase, an extra-large G-protein, other protein kinases, and transcription factors. In addition, proteases, cell wall degradation enzymes, and other proteins were also identified. These proteins thus may be components of a signaling network leading to degradation of a broad range of cellular components. Since a broad range of degradation activities is expected to occur only in the tapetal degeneration process at this stage in the stamen, it is further hypothesized that the signaling network acts in the tapetal degeneration process.

关键词： Genes degradation Lipid Mobilization Stamens signalling network pollen development Lipogenesis Lipid Metabolism degeneration Arabidopsis

Novel Ag-AgBr decorated composite membrane for dye rejection and photodegradation under visible light

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Frontiers of Chemical Science and Engineering 2021年第4期15卷 892-901页

作者： yixing wang Liheng Dai Kai Qu Lu Qin Linzhou Zhuang Hu yang Zhi Xu State Key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China

Photocatalytic membranes have received increasing attention due to their excellent separation and photodegradation of organic contaminants in ***,we bound Ag-AgBr nanoparticles onto a synthesized polyacrylonitrile-ethanolamine(PAN-ETA)membrane with the aid of a chitosan(CS)-TiO_(2) layer via vacuum filtration and in-situ partial *** introduction of the CS-TiO_(2) layer improved surface hydrophilicity and provided attachment sites for the Ag-AgBr *** PAN-ETA/CS-Ti0_(2)/Ag-AgBr photocatalytic membranes showed a relatively high water permeation flux(〜47 L·m^(-2)·h^(-1)·bar^(-1))and dyes rejection(methyl orange:88.22%;congo red:95%;methyl blue:97.41%;rose bengal:99.98%).Additionally,the composite membranes exhibited potential long-term stability for dye/salt separation(dye rejection:-97%;salt rejection:-6.5%).Moreover,the methylene blue and rhodamine B solutions(20 mL,10 mg·L^(-1))were degraded approximately 90.75% and 96.81% in batch mode via the synthesized photocatalytic membranes under visible light irradiation for 30 *** study provides a feasible method for the combination of polymeric membranes and inorganic catalytic materials.

关键词： Ag-AgBr dye rejection photodegradation visible light

Cu/ACF adsorbent modified by non-thermal plasma for simultaneous adsorption–oxidation of H_(2)S and PH_(3)

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Journal of Environmental Sciences 2023年第5期127卷 641-651页

作者： Xinyu yang Kai Li Chi wang Fei wang Xin Sun yixing Ma Yuan Li Lei Shi Ping Ning Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries Kunming University of Science and TechnologyKunming 650500China Faculty of Chemical Engineering Kunming University of Science and TechnologyKunming 650500China

Non-thermal plasma(NTP)surface modification technology is a new method to control the surface properties of materials,which has been widely used in the field of environmental protection because of its short action time,simple process and no *** this study,Cu/ACF(activated carbon fiber loaded with copper)adsorbent was modified with NTP to remove H_(2)S and PH_(3) simultaneously under low temperature and micro-oxygen ***,the effects of different modified atmosphere(air,N_(2) and NH_(3)),specific energy input(0–13 J/mL)and modification time(0–30 min)on the removal of H_(2)S and PH_(3) were *** test results indicated that under the same reaction conditions,the adsorbent modified by NH_(3) plasma with 5 J/mL for 10 min had the best removal effect on H_(2)S and PH_(3).CO_(2) temperature-programmed desorption and X-ray photoelectron spectroscopy(XPS)analyzes showed that NH_(3) plasma modification could introduce amino functional groups on the surface of the adsorbent,and increase the types and number of alkaline sites on the ***-Emmett-Teller and scanning electron microscopy showed that NH_(3) plasma modification did not significantly change the pore size structure of the adsorbent,but more active components were evenly exposed to the surface,thus improving the adsorption *** addition,X-ray diffraction and XPS analysis indicated that the consumption of active components(Cu and Cu_(2)O)and the accumulation of sulfate and phosphate on the surface and inner pores of the adsorbent are the main reasons for the deactivation of the adsorbent.

关键词： Non-thermal plasma(NTP) Surface modification Simultaneous adsorption-oxidation Cu/ACF(activated carbon fiber loaded with copper) H_(2)S PH_(3)

Airborne particles and asthma: a biophysical model

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Health 2009年第4期1卷 330-331页

作者： ming yang yixing wang Department of Botany Oklahoma State University

Airborne particles can trigger asthma when reaching certain threshold concentrations that vary by a few to several thousand times among different particles. The underlying mechanism for the variation is unknown. Here, based on common knowledge and observations, we pro-pose that the potency of an airborne particle in causing asthma correlates positively with the weight of the particle and inversely with the friction coefficient between the particle and the airway epithelium. This model may lead to new approaches for investigating the asthma phe-nomenon, and to practical applications for re-ducing the prevalence of asthma.

关键词： Pollen Spores Allergens Surface roughness Environment

On the monolayer dispersion behavior of Co_(3)O_(4)on HZSM-5 support:designing applicable catalysts for selective catalytic reduction of nitrogen oxides by ammonia

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Frontiers of Chemical Science and Engineering 2023年第11期17卷 1741-1754页

作者： Yufeng yang Lihong Zhang Tao Song yixing Huang Xianglan Xu Junwei Xu Xiuzhong Fang Qing wang Haiming Liu Xiang wang Key Laboratory of Jiangxi Province for Environment and Energy Catalysis School of Chemistry and Chemical EngineeringNanchang UniversityNanchang 330031China Shanghai Tech University School of Physical Science&TechnologyShanghai 201210China

Based on monolayer dispersion theory,Co_(3)O_(4)/ZSM-5 catalysts with different loadings have been prepared for selective catalytic reduction of nitrogen oxides by ***_(3)O_(4)can spontaneously disperse on HZSM-5 support with a monolayer dispersion threshold of 0.061 mmol 100 m^(-2),equaling to a weight percentage around 4.5%.It has been revealed that the quantities of surface active oxygen(O_(2)^(-))and acid sites are crucial for the reaction,which can adsorb and activate NO_(x)and NH_(3)reactants *** the monolayer dispersion threshold,Co_(3)O_(4)is finely dispersed as sub-monolayers or monolayers and in an amorphous state,which is favorable to generate the two kinds of active sites,hence promoting the performance of ammonia selective catalytic reduction of nitrogen ***,the formation of crystalline Co_(3)O_(4)above the capacity is harmful to the reaction performance.4%Co_(3)O_(4)/ZSM-5,the catalyst close to the monolayer dispersion capacity,possesses the most abundant active O_(2)^(-)species and acidic sites,thereby demonstrating the best reaction performance in all the *** is proposed the optimal Co_(3)O_(4)/ZSM-5 catalyst can be prepared by loading the capacity amount of Co_(3)O_(4)onto HZSM-5 support.

关键词： Co_(3)O_(4)/ZSM-5 NO_(x)-SCR by NH_(3) monolayer dispersion threshold effect surface acid sites surface active O_(2)^(-)anions

Inverse uncertainty characteristics of pollution source identification for river chemical spill incidents by stochastic analysis

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Frontiers of Environmental Science & Engineering 2018年第5期12卷 115-130页

作者： Jiping Jiang Feng Han Yi Zheng Nannan wang yixing Yuan School of Environment Harbin Institute of TechnologyHarbin 150090China School of Environmental Science and Engineering Southern University of Science and TechnologyShenzhen 581055China School of Mechanical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China

Identifying source information after river chemical spill occurrences is critical for emergency ***,the inverse uncertainty characteristics of this kind of pollution source inversion problem have not yet been clearly *** fill this gap,stochastic analysis approaches,including a regional sensitivity analysis method,identifiability plot and perturbation methods,were employed to conduct an empirical investigation on generic inverse uncertainty characteristics under a well-accepted uncertainty analysis *** studies based on field tracer experiments and synthetic numerical tracer experiments revealed several new *** example,the release load can be most easily inverted,and the source location is responsible for the largest uncertainty among the source *** diffusion and convection processes are more sensitive than the dilution and pollutant attenuation processes to the optimization of objective functions in terms of structural *** differences among the different objective functions are smaller for instantaneous release than for continuous release *** monitoring errors affect the inversion results only slightly,which can be ignored in ***,the estimated values of the release location and time negatively deviate from the real values,and the extent is positively correlated with the relative size of the mixing zone to the objective river *** new findings improve decision making in emergency responses to sudden water pollution and guide the monitoring network design.

关键词： River chemical spills Emergency response Pollution source inversion Inverse uncertainty analysis Regional Sensitivity Analysis method(RSA) Monte Carlo analysis toolbox(MCAT)

SYNTHESIS OF GUIDED CHAIN DRIVE MECHANISM WITH LINKAGE

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Chinese Journal of Mechanical Engineering 1998年第1期11卷 76-81页

作者： Shan, Baozhong Wu, Keyong wang, yixing Chen, Entao Changchun Inst of Optics and Fine Mechanics Changchun China

A method of designing guided chain drive mechanism with linkage basing on the given motion track is expounded. The method consists of two steps that are synthesizing four bar linkage approximately first and then deducing guide track, removing crank and jointing free end with chain. An example of synthesis that can realize the given motion track precisely is provided.

关键词： Chain drive Guide track Linkage Synthesis

Preparation of nitrogen and sulfur co-doped ultrathin graphitic carbon via annealing bagasse lignin as potential electrocatalyst towards oxygen reduction reaction in alkaline and acid media

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Journal of Energy Chemistry 2019年第7期28卷 33-42页

作者： yixing Shen Feng Peng Yonghai Cao Jianliang Zuo Hongjuan wang Hao Yu School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510640GuangdongChina Guangzhou Key Laboratory for New Energy and Green Catalysis School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006GuangdongChina

Renewable lignin used for synthesizing materials has been proven to be highly potential in specific ***,we report a simple method to synthesize nitrogen and sulfur co-doped carbon nanosheets by using bagasse lignin,denoted as lignin-derived carbon(LC).By adjusting the ratio of nitrogen source and annealing temperature,we obtained the ultrathin graphitic lignin carbon(LC-4-1000)with abundant wrinkles with high surface area of 1208 m2g_1 and large pore volume of 1.40 cm3g_*** alkaline medium,LC-4-1000 has more positive half-wave potential and nearly current density compared to commercial Pt/C for oxygen reduction reaction(ORR).More importantly,LC-4-1000 also exhibits comparable activity and superior stability for ORR in acid medium due to its high graphitic N ratio and a direct four electron pathway for *** study develops a cost-effective and highly efficient method to prepare biocarbon catalyst for ORR in fuel cells.

关键词： Electrocatalyst Biocarbon Lignin Nitrogen and sulfur co-doped carbon Oxygen reduction reaction

The anodically polarized Mg surface products and accelerated hydrogen evolution

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Journal of Magnesium and Alloys 2023年第1期11卷 230-248页

作者： Jufeng Huang Guang-Ling Song yixing Zhu Dajiang Zheng Ziming wang Center for Marine Materials Corrosion and Protection College of MaterialsXiamen UniversityPeople’s Republic of China State Key Laboratory of Physical Chemistry of Solid Surfaces Xiamen UniversityXiamen 361005People’s Republic of China School of Engineering The University of QueenslandSt.LuciaQld 4072Australia

To clarify the anodic dissolution mechanism of Mg,the hydrogen evolution from pure Mg in acidic solutions under galvanostatic conditions were systematically *** increasing anodic current density,the cathodic hydrogen evolution rate decreased,and the anodic hydrogen evolution became faster while some surface area on the Mg was becoming dark under anodic *** on the surface analysis results and the generally accepted basic electrochemical equations,the evolution kinetics of hydrogen from Mg was deduced,and the most possible surface intermediate active species that could facilitate the anodic Mg dissolution and anodic hydrogen evolution were *** paper further develops the model of incomplete film Mg^(+) dissolution,explains many reported experimental phenomena,and clarifies misunderstandings of current mechanism.

关键词： Magnesium Corrosion Hydrogen evolution Negative difference effect