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Experimental and theoretical investigation on degradation of dimethyl trisulfide by ultraviolet/peroxymonosulfate: Reaction mechanism and influencing factors

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Journal of Environmental Sciences 2023年第5期127卷 824-832页

作者： Jianing Sun xiaodong xin Shaohua Sun Zhenqi Du Zhenxing Yao Mingquan Wang Ruibao Jia Shandong Province Water Supply and Drainage Monitoring Center Jinan 250101China School of Water Conservancy and Environment University of JinanJinan 250022China State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China

With a large amount of domestic sewage and industrial wastewater discharged into the water bodies,sulfur-containing organicmatter inwastewater produced volatile organic sulfide,such as dimethyl trisulfide(DMTS)throughmicroorganisms,caused the potential danger of drinking water safety and human *** present,there is still a lack of technology on the removal of *** this study,the ultraviolet/peroxymonosulfate(UV/PMS)advanced oxidation processes was used to explore the degradation of *** than 90%of DMTS(30μg/L)was removed under the conditions of the concentration ratio of DMTS to PMS was 3:40,the temperature(T)was 25±2℃,and 10 min of irradiation by a 200 W mercury lamp(365 nm).The kinetics rate constant k of DMTS reacting with hydroxyl radical(HO·)was determined to be 0.2477 min^(−1).Mn^(2+),Cu^(2+)and NO_(3)^(-)promoted the degradation of DMTS,whereas humic acid and Cl-in high concentrations inhibited the degradation *** chromatography-mass spectrometry was used to analyze the degradation products and the degradation intermediates were dimethyl disulfide and *** functional theory was used to predict the possible degradation mechanism according to the frontier orbital theory and the bond breaking mechanism of organic *** results showed that the S–S,C–S and C–H bonds in DMTS molecular structure were prone to fracture in the presence of free radicals,resulting in the formation of alkyl radicals and sulfur-containing radicals,which randomly combined to generate a variety of degradation products.

关键词： Ultraviolet/peroxymonosulfate Dimethyl trisulfide Products Density functional theory Degradation mechanism

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OsMLH1 interacts with OsMLH3 to regulate synapsis and interference-sensitive crossover formation during meiosis in rice

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Journal of Genetics and Genomics 2021年第6期48卷 485-496页

作者： xiaodong xin xingwang Li Junkai Zhu Xiaobin Liu Zhenghu Chu Jiali Shen Changyin Wu National Key Laboratory of Crop Genetic Improvement National Center of Plant Gene Research(Wuhan)Huazhong Agricultural UniversityWuhan 430070China Jiangsu Kingearth Seed Co. Ltd.Yangzhou 225012China

Meiotic recombination is essential for reciprocal exchange of genetic information between homologous chromosomes and their subsequent proper segregation in sexually reproducing organisms. MLH1 and MLH3 belong to meiosis-specific members of the Mut L-homolog family, which are required for normal level of crossovers(COs) in some eukaryotes. However, their functions in plants need to be further ***, we report the identification of Os MLH1 and reveal its functions during meiosis in rice. Using CRISPRCas9 approach, two independent mutants, Osmlh1-1 and Osmlh1-2, are generated and exhibited significantly reduced male fertility. In Osmlh1-1, the clearance of PAIR2 is delayed and partial ZEP1 proteins are not loaded into the chromosomes, which might be due to the deficient in resolution of interlocks at late zygotene. Thus, Os MLH1 is required for the assembly of synapsis complex. In Osmlh1-1, CO number is dropped by ~53% and the distribution of residual COs is consistent with predicted Poisson distribution,indicating that Os MLH1 is essential for the formation of interference-sensitive COs(class I COs). Os MLH1 interacts with Os MLH3 through their C-terminal domains. Mutation in Os MLH3 also affects the pollen fertility. Thus, our experiments reveal that the conserved heterodimer Mut Lg(Os MLH1-Os MLH3) is essential for the formation of class I COs in rice.

关键词： Meiosis Crossover OsMLH1 OsMLH3 Rice

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Characterization of 3D DNA Assemblies Using Cryogenic Electron Microscopy

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Chemical Research in Chinese Universities 2020年第2期36卷 227-236页

作者： WANG Mingyang DUAN Jialin DAI Lizhi xin xiaodong WANG Fangfang LI Zheng TIAN Ye School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105P.R.China Shenzhen Research Institute Nanjing UniversityShenzhen 518057P.R.China College of Engineering and Applied Sciences National Laboratory of Solid State MicrostructuresCollaborative Innovation Center ofAdvanced MicrostructuresJiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing 210093P.R.China National Facility for Protein Science in Shanghai Zhangjiang LabShanghai 201210R R.China School of Physics and Optoelectronic Engineering Ludong UniversityYantai 264025P.R.China Chemistry and Biomedicine Innovation Center Nanjing UniversityNanjing 210023R R.China

DNA nanotechnology utilizes DNA double strands as building units for self-assembly of DNA *** specific base-pairing interaction between DNA molecules is the basis of these *** decades of development,this technology has been able to construct complex and programmable *** the increase in delicate nature and complexity of the synthesized nanostructures,a characterization technology that can observe these structures in three dimensions has become necessary,and developing such a technology is considerably *** assemblies have been studied using different characterization methods including atomic force microscopy(AFM),scanning electron microscopy(SEM),and transmission electron microscopy(TEM).However,the three-dimensional(3D)DNA assemblies always collapse locally due to the dehydration during the drying *** electron microscopy(cryo-EM)can overcome the challenge by maintaining three-dimensional morphologies of the cryogenic samples and reconstruct the 3D models from cryogenic samples accordingly by collecting thousands of two-dimensional(2D)projection images,which can restore their original morphologies in ***,we have reviewed several typical cases of 3D DNA-assemblies and highlighted the applications of cryo-EM in characterization of these *** comparing with some other characterization methods,we have shown how cryo-EM promoted the development of structural characterization in the field of DNA nanotechnology.

关键词： DNA nanotechnology DNA-assembly Cryogenic electron microscopy

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Enhancing volatile fatty acids production from waste activated sludge: The role of pretreatment by N,N-bis(carboxymethyl)-L-glutamate (GLDA)

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Environmental Science and Ecotechnology 2024年第5期21卷 149-157页

作者： Chang Liu Lin Li Linji Xu Tanglong Zhang Qiang He xiaodong xin Key Laboratory of the Three Gorges Reservoir Region's Eco-environment Ministry of EducationCollege of Environment and EcologyChongqing UniversityChongqing400045PR China Research Center for Eco-Environmental Engineering Dongguan University of TechnologyDongguan523808PR China

N,N-bis(carboxymethyl)-L-glutamate(GLDA)is an eco-friendly chelating agent that effectively extracts multivalent metal ions from waste activated sludge(WAS)flocs,which could potentially alter their ***,the effect of GLDA on the production of volatile fatty acids(VFAs)from WAS is not well ***,we demonstrate that pretreatment with GLDA at a concentration of 200 mmol per kg VSS results in a significant increase of 142%in extractable extracellular polymeric substances and enhances the total VFAs yield by 64%compared to untreated *** reveal GLDA's capability to mobilize organic-binding multivalent metal ions within sludge ***,post-pretreatment analyses showed the release of 69.1 mg L^(-1) of Ca and 109.8 mg L^(-1) of Fe ions from the flocs,leading to a more relaxed floc structure and a reduced apparent activation energy(10.6 versus 20 kJ mol1)for WAS *** dynamic simulations further demonstrate GLDA's preferential binding to Fe3þand Ca2þover Mg2þ.Our study suggests that GLDA pretreatment causes minimal disruption to reactor stability,thereby indicating the stability of microbial community *** has emerged as a viable pretreatment agent for enhancing volatile fatty acids production from waste activated sludge.

关键词： Anaerobic fermentation Pretreatment Resource recovery Multivalent metals Solubilization

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Waste sludge disintegration, methanogenesis and final disposal via various pretreatments: Comparison of performance and effectiveness

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Environmental Science and Ecotechnology 2021年第4期8卷 119-129页

作者： Haiyang He xiaodong xin Wei Qiu Dong Li Zhicen Liu Jun Ma State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin150090China Department of Environmental Science and Engineering Huaqiao UniversityXiamen361021China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlSchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjing210044China School of Geosciences The University of EdinburghEdinburghEH89JUUK

This study compared the three wastewater pretreatments of ozonation,Fe2þ-S2O82and freeze-thawing(F/T)in the disintegration,anaerobic digestion(AD)and final disposal of the *** F/T pretreatment increased the dewaterability and settleability of the sludge by 7.8%and 47.1%,*** ozonation pretreatment formed more volatile fatty acids(VFAs),with a peak value of 320.82 mg SCOD/L and controlled the release of *** Fe2þ-S2O82pretreatment removed heavy metals through the absorption and flocculation of ferric particles formed *** the anaerobic digestion of the sludge,the ozonation pretreatment accelerated the hydrolysis rate(k)rather than the biochemical methane potential(B0)of the sludge due to the high VFA content in the ***,the F/T pretreatment facilitated the B0 with great economic efficiency by enhancing the solubilisation of the *** Fe2þ-S2O82pretreatment decreased the methane production,the ferric particle was a unique advantage in the disintegration and harmless disposal of the *** digested sludge had more VFAs after ozonation pretreatment,which contributed to the recycling of *** addition,the lower sludge volume could save the expense of transportation and disposal by ozonation *** pretreatments had different *** comparative study provided information allowing the selection of the type of pretreatment to achieve different objectives of the treatment and disposal of sludge.

关键词： Sludge disintegration Anaerobic sludge digestion Effectiveness comparison Different pretreatments

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Quick ice mass loss and abrupt retreat of the maritime glaciers in the Kangri Karpo Mountains, southeast Tibetan Plateau

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Chinese Science Bulletin 2008年第16期53卷 2547-2551页

作者： YANG Wei YAO TanDong XU BaiQing WU GuangJian MA LingLong xin xiaodong Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100085 China National Key Laboratory of Cryospheric Science Chinese Academy of Sciences Lanzhou 730000 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

The maritime glaciers are sensitive to climate change because of high annual precipitation and high air temperature in the region. A combined comprehensive study was carried out based on glacier mass balance observation, GPS-based glacier terminus position survey, glacier Ground Penetrating Radar, topography maps and RS satellite images in the Kangri Karpo Mountains, Southeast Tibet. The study revealed a strong ice mass loss and quick glacier retreat since the 1970s. Ata Glacier, one glacier from the south slope of the Kangri Karpo Mountains, has formed a 6-km-long terminal moraine zone at the end of the glacier since the 1970s, and the accelerating retreat is largely due to the strong glacier sur- face melting. Mass balance study on the other four glaciers on the northern side of the Kangri Karpo Mountains shows that they are in large negative mass balance and the glaciers had retreated 15―19 m from May 2006 to May 2007. The in-situ glacier observation also shows that the glacier retreat is more obvious in small glaciers. The enhanced ice mass deficit caused by climate warming and the ongoing extinction of many small glaciers in this region could seriously affect the water resources, environ- ments, local climate and regional sustainable development in the near future.

关键词：西藏高原海上冰川山脉气候变化

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Oxidative C—H alkynylation of 3,6-dihydro-2H-pyrans

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Chinese Chemical Letters 2019年第7期30卷 1432-1434页

作者： Ran Zhao Guidong Feng xiaodong xin Honghao Guan Jing Hua Renzhong Wan Wei Li Lei Liu Department of Pharmaceutical Analysis School of Pharmacy Shandong University of Traditional Chinese Medicine Ji'nan 250355 China College of Animal Science and Veterinary Medicine Shandong Agricultural University Taian 271018 China School of Chemistry and Chemical Engineering Shandong University Ji'nan 250100 China State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University Guilin 541004 China

Current synthesis of α-substituted 3,6-dihydro-2H-pyrans dominantly relies on functional group transformation. Herein, a direct and practical oxidative C -H alkynylation and alkenylation of 3,6-dihydro-2H-pyran skeletons with a range of potassium trifluoroborates is developed. The metal-free process is well tolerated with a wide variety of 3,6-dihydro-2H-pyrans, rapidly providing a library of 2,4-disubstituted 3,6-dihydro-2H-pyrans with diverse patterns of α-functionalities for further diversification and bioactive small molecule identification.

关键词： 3,6-Dihydro-2H-pyrans C-H Functionalization Alkynylation Oxidation Organoborane

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Effect of indium distribution on optical properties in InGaAs/GaAs quantum wells

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Frontiers of Optoelectronics 2009年第1期2卷 108-112页

作者： Guozhi JIA Jianghong YAO Yongchun SHU xiaodong xin Biao PI Tianjin Institute of Urban Construction The Key Lab of Advanced Technique and Fabrication for Weak-Light Nonlinear Photonics Materials TEDA Applied Physics SchoolNankai University

The effect of In surface segregation and diffusion on the transition energy of an InGaAs/GaAs strained quantum well(QW) was investigated theoretically. Diffusion equations and the Schr?dinger equation on the InGaAs/GaAs QW were solved numerically. The energy shifts under different diffusion lengths were simulated. When the width of QW, L, is larger than 5 nm, the change rate of the transition energy is very minimal at the initial stage of the annealing process for wide QW, and the transition energy has a rapid blue shift with an increase of the diffusion length. When L is smaller than 5 nm, the transition energy is very sensitive to the diffusion *** change rate of transition energy increases with a decrease in QW width.

关键词： 29\c1\b0\8b\hcm0000078737.html

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Microbial Community Profiles Related to Volatile Fatty Acids Production in Mesophilic and Thermophilic Fermentation of Waste Activated Sludge Pretreated by Enzymolysis

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Journal of Harbin Institute of Technology(New Series) 2020年第4期27卷 60-73页

作者： xiaodong xin Bingxin Wang Junming Hong Junguo He Wei Qiu Bor-Yann Chen Department of Environmental Science and Engineering Huaqiao UniversityXiamen 361021China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150090China Department of Chemical and Materials Engineering I-Lan UniversityI-Lan 26047TaiwanChina

Mesophilic and thermophilic anaerobic fermentation performance of waste activated sludge(WAS)pretreated by enzymes catalysis associated with microbial community shifts were *** disintegration was boosted considerably by enzymolysis with 8750 mg/L of soluble COD release within 180 *** anaerobic fermentation(MAF)produced nearly equal VFA accumulation with over 3200 mg COD/L compared with that of thermophilic fermentation(TAF).Bacterial community consortia showed great shifting differences in dynamics of main T⁃RFs between MAF and ***,MAF was conducive to form intermediate bacterial community evenness compared to TAF,which preserved a robust function of VFA *** enzymes catalysis prompted bio⁃energy(electricity)recovery potential of WAS organics via anaerobic fermentation(MAF/TAF)with evaluating electricity conversion efficiency of 0.75-0.82 kW·h/kg VSS(3.9 times higher than control test).Finally,this study proposed some novel thinking on future WAS treatment/management towards energy recovery coupled with energy⁃sufficient wastewater treatment by co⁃locating WAS anaerobic fermentation,MFC plant with wastewater treatment plant(s).

关键词： waste activated sludge(WAS) enzymes catalysis volatile fatty acid(VFA) bacterial community electric energy conversion

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Handover Mechanism in Coordinated Multi-Point Transmission/Reception System

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ZTE Communications 2010年第1期8卷 31-35页

作者： Xu xiaodong Chen xin Li Jingya Key Lab. of Universal Wireless Communications Ministry of Education Wireless Technology Innovation Institute Beijing University of Posts and Telecommunications Beijing 100876 P. R. China

Coordinated Multi-Point （CoMP） transmission/reception technology has been the focus of much attention recently and has becom a key research interest in 3GPP LTE-Advanced due to its ability to improve both cell-edge and average system performance. However, CoMP technology requires brand-new handover mechanism, or else its real performance will be limited. This paper proposes a novel handover mechanism supporting CoMP based on the handover scenario in CoMP communication system architecture, including information sharing and signaling transmission procedure of CoMP cooperating sets handover and CoMP transmission points selection/update. The proposed scheme could not only support CoMP well, but also reduce the overhead of information exchange and signaling transmission.

关键词： signaling transmission CoMP performance technology information exchange system architecture information sharing communication attention research interest improve However points paper novel based 3GPP key

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