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Magnesium single-atom catalysts with superbasicity

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Science China Chemistry 2023年第6期66卷 1737-1743页

作者： Xiang-Bin Shao Yao Nian song-song peng Guo-song Zhang Meng-Xuan Gu You Han Xiao-Qin Liu Lin-Bing Sun State Key Laboratory of Materials-Oriented Chemical Engineering Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

Magnesium-related solid bases have long been considered catalysts with weak or medium *** we report the fabrication of Mg single-atom catalysts with superbasicity for the first time.A sublimation-migration-anchoring strategy is employed,in which the Mg net is sublimated,transported by Ar,and trapped by defective graphene(producing Mg_(1)/G).Simulated and experimental results demonstrate that Mg single atoms are anchored on graphene in tetra-coordination,and Mg single atoms cooperating with C atoms give superbasicity,which differs from conventional alkali/alkaline earth metal oxides with basicity originating from O *** new solid base is highly active in the synthesis of dimethyl carbonate through transesterification of ethylene carbonate with methanol,which is usually catalyzed by strong *** turnover frequency value reaches 99.6 h^(-1) on Mg_(1)/G,which is much higher than that of traditional Mg-related counterparts(1.0–5.6 h^(-1))and even superior to that of typical Na and K-related solid superbases(29.8–36.2 h^(-1))under similar conditions.

关键词： solid superbase single Mg atoms heterogeneous catalysts transesterification reaction

Detection of rice seed vigor by low-field nuclear magnetic resonance

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International Journal of Agricultural and Biological Engineering 2018年第6期11卷 195-200页

作者： Ping song peng song Hongwei Yang Tao Yang Jing Xu Kaitian Wang College of Information and Electrical Engineering Shenyang Agricultural UniversityShenyang 110866China Beijing Research Center for Information Technology in Agriculture Beijing 10097China National Research Center of Intelligent Equipment for Agriculture Beijing 10097China

A new method to predict the seed vigor of rice was developed to control adulteration during the seed trading process and to address the deficiencies of traditional manual detection ***-field nuclear magnetic resonance(LF-NMR)technique was used to detect the vigor of rice *** varieties(Beijing-1,Qianchonglang-2,Yanfeng-47 and Shennong-265)of rice seeds from the Rice Research Institute of Shenyang Agricultural University were chosen for the *** transverse relaxation time T_(2),T_(21) and T_(22) were observed in the *** peak start time of free water(transverse relaxation time T_(22)),signal amplitude of bound water(transverse relaxation time T_(21)),and moisture content decreased with the decrease in the vigor of the *** were no obvious trends observed for the top of the peak and the end point of the transverse relaxation time T_(22).In addition,the start,top,and end time of the peak(transverse relaxation time T_(21)),and the signal amplitude of bound water showed no consistent *** results indicated that LF-NMR could be used as a method to distinguish the vigor of rice seeds *** study provided theoretical basis and technical support for the rapid detection of rice seed vigor.

关键词： nondestructive detection nuclear magnetic resonance transverse relaxation time signal amplitude rice seeds vigor

Rapid and non-destructive detection method for water status and water distribution of rice seeds with different vigor

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International Journal of Agricultural and Biological Engineering 2021年第2期14卷 231-238页

作者： Ping song Ghiseok Kim peng song Tao Yang Xia Yue Ying Gu College of Information and Electrical Engineering Shenyang Agricultural UniversityShenyang 110866China Liaoning Engineering Research Centre for Information Technology in Agricultural Shenyang Agricultural UniversityShenyang 110866China Department of Biosystems&Biomaterials Science and Engineering College of Agriculture&Life SciencesSeoul National UniversitySeoul 08826Korea College of Plant Science&Technology Huazhong Agricultural UniversityWuhan 430070China School of Information and Intelligence Engineering University of SanyaSanyaHainan 572022China Academician Workstation of Guoliang Chen University of SanyaSanyaHainan 572022China

In this study,newly harvested and aged rice seeds were analyzed to determine their aging process,identify the difference between artificially and naturally aged seeds,and develop a rapid,accurate,and non-destructive detection method for water status and water distribution of rice seed with different *** this end,an artificially accelerated aging test was conducted on the newly harvested rice ***,low-field nuclear magnetic resonance(LF-NMR)technology was applied to test the new(Shennong No.9816,2018),old(Shennong No.9816,2017),and artificially aged seeds(Shennong No.9816,2018).A standard germination test was conducted for three types of ***,the differences of water status and distribution between rice seeds of different vigor were analyzed based on the standard germination test results and wave spectrometry information collected using *** results indicated that new seeds,old seeds,and the artificially accelerated aging rice seeds all exhibited two water phases,and the vigor of rice seeds after the artificial accelerated aging test was lower than that of new *** were significant differences between the frequencies of bound water at the time of the peak and the time at the end of the peak for the three types of *** two times showed an increasing trend for rice seeds with poor vigor,indicating that the ability of the water in the rice seeds having poor vigor to combine with other substances was *** were significant differences between the distributions of free water peak end time for the three types of *** the rice seeds with poor vigor exhibited a decreasing trend at this time,indicating that the freedom of free water inside the rice seed samples with poor vigor was *** total water content of the artificially aged seeds and the aged seeds was higher than that of the new seeds,but the free water content increased from artificially aged seeds to new seeds to aged *** indicates that LF-NMR technol

关键词： low-field nuclear magnetic resonance rice seed water status detection water distribution detection seed vigor

An assessment of China-Japan-Korea Free Trade Agreement＇s economic and environmental impacts on China

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Frontiers of Environmental Science & Engineering 2012年第6期6卷 849-859页

作者： Zhaoyang LIU Xianqiang MAO Wei TANG Tao HU peng song School of Environment Beijing Normal Univ.ersityBeijing 100875China Policy Research Center of Environment and Economy Ministry of Environmental ProtectionBeijing 100029China

Recently, China, Japan, and the Republic of Korea （Korea） are conducting a government-commis- sioned feasibility study on the Free Trade Agreement among the three countries （CJKFTA） to form a regional free trade zone in East Asia. Considering that freer trade can cause unexpected impact on domestic environment, there is a need to evaluate the environmental impact of such a trade policy. This move should be made to help negotiators understand and pay more attention to environ- mental issues during CJKFTA negotiations, and to help lobby with the government to carry out appropriate policy instruments for adaptation or mitigation. Following the Chain Reaction Assessment Method that integrates and links the elements of trade, production, and environment, the present research aims to quantitatively assess CJKFTA＇s possible impact on China＇s environment. This is done by estimating the variations of China＇s major conventional pollutants and greenhouse gases （GHGs） emission in two policy scenarios to represent CJKFTA＇s scale and composition effects on China＇s environment. Estimating the variations is based on a static Computable General Equilibrium model, working with Global Trade Analysis Project （GTAP） 7 database and China＇s energy- environment statistics. Based on these assessments, CJKFTA is predicted to lead to notable environmental impact, including increased emissions of agricultural total nitrogen, agricultural total phosphorus, chemical oxygen demand, and GHGs. On the other hand, decreased emissions of industrial SO2 and dust are also expected to happen. Suitable policies need to be made to combat negative effects and amplify positive ones, while aiming at a more sustainable regional freer trade system.

关键词： Free Trade Agreement Strategic Environ-mental Assessment Chain Reaction Assessment Method,Computable General Equilibrium model Global TradeAnalysis Project

Analysis of Global Expression Profiles of Arabidopsis Genes Under Abscisic Acid and H2O2 Applications

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Journal of Integrative Plant Biology 2006年第1期48卷 62-74页

作者： peng-Cheng Wang Yan-Yan Du Guo-Yong An Yun Zhou Chen Miao Chun-peng song Laboratory of Plant Stress Biology Department of Biology Henan University Kaifeng 475001 China

To gain insight into the coordination of gene expression profiles under abscisic acid （ABA） and H2O2 applications, global changes in gene expression in response to ABA and H2O2 in Arabidopsis seedlings were investigated using GeneChip （Santa Clara, CA, USA） arrays. Among over 24 000 genes present in the arrays, 459 tran- scripts were found to be significantly increased, whereas another 221 decreased following H2O2 treatment compared with control. Similar to treatment with H2O2, ABA treatment elevated the transcription of 391 genes and repressed that of 322 genes. One hundred and forty-three upregulated genes and 75 downregulated genes were shared between the two treatments and these genes were mainly involved in metabolism, signal transduction, transcription, defense, and resistance. Only two genes, which encode an APETALA2/dehydra- tion-responsive element binding protein （AP2/DREBP） family transcriptional factor and a late embryogenesis- abundant protein, were downregulated by H202, but upregulated by ABA. These results suggest that, similar to ABA, H202 plays a global role in gene transcription of Arabidopsis seedlings. The transcriptional responses induced by the application of exogenous ABA and H2O2 overlapped substantially. These two treatments regulated most of the downstream genes in a coordinated manner.

关键词： abscisic acid gene expression hydrogen peroxide microarray.

Fluorescent silicon nanoparticle-based gene carriers featuring strong photostability and feeble cytotoxicity

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Nano Research 2016年第10期9卷 3027-3037页

作者： Jingyang Pang Yuanyuan Su Yiling Zhong Fei peng Bin song Yao He Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Institute of Functional Nano and Soft Materials (FUNSOM)Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215123 China

Safe fluorescent gene-transfection vectors are in great demand for basic biological applications and for gene-therapy research. Here, we introduce a new type of luminescent silicon nanoparticle （SiNP）-based gene carrier suitable for determining the intracellular fate of the gene vehicle in a long-term and real-time manner. The presented SiNP-based nanocarriers simultaneously feature strong and stable fluorescence, high DNA-loading capacity and gene-transfection efficienc35 as well as favorable biocompafibility. Taking advantage of these unique benefits, we were able to readily observe the behavior of the gene carriers in live cells （e.g. cellular uptake, intracellular trafficking, and endosomal escape） in a long-term and real- time manner. The results demonstrate the potential usability of these fluorescent SiNP-based gene vectors as powerful tools in the field of gene therapy, and provide invaluable information for understanding the intracellular behavior of gene carriers.

关键词： fluorescent silicon nanoparficles gene delivery biocompatibility long-term and real-time tracking

Shock initiation performance of NTO-based polymer bonded explosive

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Defence Technology（防务技术） 2022年第9期18卷 1538-1545页

作者： peng-song Nie Shao-hua Jin Li-xiao-song Du Li-jie Li Kun Chen Yu Chen Rui Yu School of Materials Science and Engineering Beijing Institute of TechnologyZhongguancun South Street 5Beijing100081China Xi'an Modern Control Technology Research Institute Xi'an710065China

3-nitro-1,2,4-tri-azol-5-one(NTO) is a high energy insensitive explosive. To study the shock initiation process of NTO-based polymer bonded explosive JEOL-1(32%octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine(HMX), 32% NTO, 28% Al and 8% binder system), the cylinder test, the gap experiments and numerical simulation were carried out. Firstly, we got the detonation velocity(7746 m/s) and the parameters of Jones-Wilkins-Lee(JWL) equation of state(EOS) for detonation product by cylinder test and numerical simulation. Secondly, the Hugoniot curve of unreacted explosive for JEOL-1 was obtained calculating the data of pressure and time at different Lagrangian positions. Then the JWL EOS of unreacted explosive was obtained by utilizing the Hugoniot curve as the reference curve. Finally, we got the pressure growth history of JEOL-1 under shock wave stimulation and the parameters of the ignition and growth reaction rate equation were obtained by the pressure-time curves measured by the shockinitiation gap experiment and numerical simulation. The determined trinomial ignition and growth model(IG model) parameters can be applied to subsequently simulation analysis and design of insensitive ammunition with NTO-based polymer bonded explosive.

关键词： NTO Shock initiation Hugoniot data JWL Ignition and growth reactive model

Phase separation in plants:New insights into cellular compartmentalization

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Journal of Integrative Plant Biology 2021年第11期63卷 1835-1855页

作者： Xiumei Xu Canhui Zheng Dandan Lu Chun‐peng song Lixin Zhang State Key Laboratory of Crop Stress Adaptation and Improvement School of Life SciencesHenan UniversityKaifeng 475004China

A fundamental challenge for cells is how to coordinate various biochemical reactions in space and time. To achieve spatiotemporal control, cells have developed organelles that are surrounded by lipid bilayer membranes. Further, membraneless compartmentalization, a process induced by dynamic physical association of biomolecules through phase transition offers another efficient mechanism for intracellular organization. While our understanding of phase separation was predominantly dependent on yeast and animal models, recent findings have provided compelling evidence for emerging roles of phase separation in plants. In this review, we first provide an overview of the current knowledge of phase separation, including its definition, biophysical principles, molecular features and regulatory mechanisms. Then we summarize plant-specific phase separation phenomena and describe their functions in plant biological processes in great detail. Moreover, we propose that phase separation is an evolutionarily conserved and efficient mechanism for cellular compartmentalization which allows for distinct metabolic processes and signaling pathways, and is especially beneficial for the sessile lifestyle of plants to quickly and efficiently respond to the changing environment.

关键词： cellular compartmentalization changing environment condensates liquid droplets phase separation

LA-ICP-MS Zircon U-Pb Age and Hf Isotopic Composition of Late Carboniferous Granodiorite in the Southern East Junggar,Xinjiang:Genesis and Tectonic Implication

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Acta Geologica Sinica(English Edition) 2019年第S1期93卷 140-141页

作者： song peng WANG Tao TONG Ying Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China Beijing SHRIMP Center Beijing 100037China

A large area of Late Paleozoic intrusions occursalong the Kalamaili fault in North Xinjiang,which is divided into I-type and A-type granite(Liu et al.,2013),and are the ideal objects for revealing the geological evolu... 详细信息

关键词： zircon U-Pb age Hf isotopic composition granodiorite East Junggar continental growth