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Study on the atmospheric photochemical reaction of CF_3.radicals using ultraviolet photoelectron and photoionization mass spectrometer

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Science china chemistry 2008年第4期51卷 316-321页

作者： yao li1,2. du lin1,{2.,{3. ge maofa1 1 beijing national laboratory for molecular sciences (BNLMS), state key laboratory for structural chemistry of unstable and stable species, institute of chemistry,{12., beijing 100080, china 2.Graduate University of{12., beijing 100080, china 1. beijing national {2. for {3. sciences (BNLMS) State Key Laboratory for Structural Chemistry of Unstable and Stable Species Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China 2. Graduate University of chinese academy of sciences Beijing 100080 China

A study of the atmospheric photochemical reaction of CF3.radical with CO and O2.was performed by using a homemade ultraviolet photoelectron spectrometer-photoionization mass spectrometer (PES- PIMS). The electronic structures and mechanism of ionization and dissociation of CF3.C(O)OOC(O)- OCF3.were investigated. It was indicated that the two bands on the photoelectron spectrum of CF3.C(O)OOC(O)OCF3.are the result of ionization of an electron from a lone pair of oxygen and a fluo- rine lone pair of CF3.group. The outermost electrons reside in the oxygen lone pair. The experimental and theoretical first vertical ionization energy is 13.2. and 13.178 eV, respectively, with the PES and OVGF method. They are in good agreement. The photo ionization and dissociation processes were discussed with the help of theoretical calculations and PES-PIMS experiment. After ionization, the parent ions prefer the dissociation of the C-O bond and giving the fragments CF3.CO+ and CF3.. It demonstrated that the ultraviolet photoelectron and photoionization mass spectrometer could be ap- plied widely in the study of atmospheric photochemical reaction.

关键词： photochemical reaction CF3 radical ultraviolet photoelectron and photoionization mass spectroscopy transient species

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The Ca^(2.)/CaN/ACC and cAMP/PKA/HK signal pathways are required for PBAN-mediated sex pheromone biosynthesis in Conogethes punctiferalis

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Journal of Integrative Agriculture 2024年第8期23卷 2735-2751页

作者： yao Zhang Zelong She Ruolan He Shuangyan yao Xiang {2. Xiaoguang {2.u Xinming yin Jizhen Wei Mengfang du shiheng An state key {2. of Wheat and Maize Crop Science/Henan Inter{3. {2. for Green Pest Control/College of Plant Protection Henan Agricultural UniversityZhengzhou 450046China

Conogethes punctiferalis is a crop and fruit pest that has caused serious economic losses to agricultural *** pest relies heavily on its sex pheromone to ensure sexual encounters and subsequent mating ***,the {{3. mechanism underlying sex pheromone biosynthesis in this species remains *** present study investigated the detailed mechanism underlying PBAN-regulated sex pheromone biosynthesis in *** by transcriptome sequencing of the *** pheromone glands(PGs)and subsequent functional identification of the target *** results showed that female mating started from the first scotophase,and peaked at the second to fifth scotophases in accordance with the release of sex *** regulated sex pheromone biosynthesis by employing Ca^({3.)and cAMP as secondary messengers,as demonstrated by RNA interference(RNAi),pharmacological inhibitors,and behavioral *** investigation revealed that calcineurin(CaN)and acetyl-CoA carboxylase(ACC)were activated by PBAN/Ca^({3.)signaling,and the RNAimediated knockdown of CaN and ACC transcripts significantly re{13.ced sex pheromone pro{13.ction,ultimately leading to a significantly re{13.ced ability of females to attract ***,hexokinase(HK)was found to regulate sex pheromone biosynthesis in response to the PBAN/cAMP/PKA signaling pathway,as demonstrated by RNAi,enzyme activity,and pharmacological inhibitor ***,Far{3.and Desaturase1 were found to participate in PBAN-regulated sex pheromone ***,our findings revealed that PBAN regulates sex pheromone biosynthesis through the PBANR/Ca^({3.)/CaN/ACC and PBANR/cAMP/PKA/HK pathways in ***,which enriches our comprehension of the details of sex pheromone biosynthesis in moths.

关键词： Conogethes punctiferalis sex pheromone cAMP/PKA calcineurin acetyl-CoA carboxylase hexokinase

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genomic research for important pathogenic bacteria in china

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Science china(life {2.) 2009年第1期52卷 50-63页

作者： YANG RuiFu1,GUO XiaoKui2,YANG Jian3.JIANG YongQiang1,PANG Bo4,CHEN Chen5,yao YuFeng2,QIN JinHong2.& li QingTian2 1 {3. of Analytical Microbiology,state key {3. of Pathogen and Biosecurity,beijing institute of Microbiology and Epidemiology,beijing 100071,china 2 Department of Medical Microbiology and Parasitology,institutes of Medical {13.,Shanghai Jiao Tong University School of Medicine,Shanghai 200025,china 3.state key {3. for molecular Virology and genetic engineering,institute of Pathogen Biology,chinese {23. of Medical {13.,beijing 100176,china 4 state key {3. for Infectious Disease Prevention and Control,institute for Communicable Disease Control and Prevention,chinese Center for Disease Control and Prevention,beijing 102206,china 5 beijing genomics institute at Shenzhen,Shenzhen 518083.china 1. laboratory of Analytical Microbiology State Key Laboratory of Pathogen and Biosecurity Beijing Institute of Microbiology and Epidemiology Beijing 100071 China 2. Department of Medical Microbiology and Parasitology Institutes of Medical Sciences Shanghai Jiao Tong University School of Medicine Shanghai 200025 China 3. state key {2. for {3. Virology and genetic engineering Institute of Pathogen Biology Chinese Academy of Medical Sciences Beijing 100176 China 4. state key {2. for Infectious Disease Prevention and Control Institute for Communicable Disease Control and Prevention Chinese Center for Disease Control and Prevention Beijing 102206 China 5. beijing genomics institute at Shenzhen Shenzhen 518083 China

Rapid accumulation of bacterial genomic data offered an unprecedented opportunity to understand bacterial biology from a holistic view of *** can thus closely look at the way in which a pathogen is evolved,and these data has been applied to {2. epidemiology and microbial forensics,and screening of novel diagnostic,vaccine and drug *** newly developed high-throughput low-cost sequencing technologies,such as 454,Solexa and SOliD,will promote the acquisition and application of genomic data in new research areas that we dared not imagine previously,such as the metagenomics of human gastric-intestinal tract,for better and comprehensive understanding of human health and disease.

关键词： genome pathogenic bacteria sequencing application

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Enhancing the Efficiency and durability of Perovskite Solar Cells by Donor-Acceptor Covalent Organic Framework with Thiazolo[5,4-d]thiazole Unit

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CCS chemistry 2024年第7期6卷 1721-1730页

作者： liyi yao Shuainan liu {3. li Bangdi ge Wenyu Jiao Siyu Zong Xiaowei Song Donglei Zhou Zhiqiang liang state key Lab of Inorganic Synthesis and Preparative {2. College of ChemistryJilin UniversityChangchun 130012 state key {2. of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012 Electron Microscopy Center Jilin UniversityChangchun 130012

Donor-Acceptor(D-A)alignment is considered a productive strategy to improve the charge separation efficiency of covalent organic frameworks(COFs)and enhance the charge-transfer yield(CTY)of ***,organic molecules containing heteroatoms can produce coordination interaction with PbI2.of perovskite precursor to affect the crystallization process,thereby impeding the decomposition and improving the stability of perovskite ***,a thiazolo[5,4-d]thiazole(TZ)-based D-A type COF_(TPDA-TZDA) was designed and synthesized from N,N,N′,N′-tetrakis(4-aminophenyl)-1,4-benzenediamine(TPDA)and 4,4′-(thiazolo[5,4-d]thiazole-2.5-diyl)dibenzaldehyde(TZDA).Upon incorporation into the FAPbI3.layer,COF_(TPDA-TZDA) not only restrained the perovskite defects and enhanced the grain size of perovskite films through the coordination effect of the N atoms of TZDA but also ameliorated the charge transport within the perovskite film,which was the benefit of the D-A structure of COF_(TPDA-TZDA).As a result,incorporation of COF_(TPDA-TZDA) into the perovskite solar cells(PSCs)led to a remarkable power conversion efficiency(PCE)of up to 2..51%.Furthermore,even after being stored in high relative humidity(RH≈60%)for 480 h,these PSCs maintained over 90.55%of their original *** work sets the foundation for the development of highly efficient and stable PSCs by utilizing TZ-based D-A type COFs.

关键词： thiazolo[5,4-d]thiazole perovskite solar cells donor-acceptor covalent organic frameworks charge-transfer

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Vertical structure and seasonal variation of tidal and residual currents in the northern Huanghai Sea

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Acta Oceanologica Sinica 2011年第5期30卷 14-22页

作者： SONG Jun GUO Junru QIAO Lulu MU lin yao Zhigang {2.U Yang {2. Huan BAO Xianwen SUN Xiaoyan GAO Jia national Marine Data and Information Service State Oceanic Administration Tianjin 300171 China College of Physical and Environmental Oceanography Ocean University of China Qingdao 266100 China key laboratory of Seafloor Science and Exploration Technology Ocean University of China Qingdao 266100 China national Marine Environmental Forecasting Center State Oceanic Administration Beijing 100081 China

Analysis of tidal current and sea level has been made based on the observations from the summer of 2.06 to the winter of 2.07,*** result indicates that a two-layer structure of residual current exists in summer,with its upper layer going northwestward and the lower layer *** addition,some strong residuals exist in the neighboring depth of the pycnocline during the current period of astronomical *** winter,except some individual layersthe residual currents mostly direct to the northwest,from which we can see the fluctuation of abnormal sea-level and the appearance of associated current because of the changes of the wind *** analysis of tidal ellipse indicates that the direction of the maximum semidiurnal component is clockwise from summer to winter,with an angle of ***,in summer the semidiurnal component rotates with depth clockwise while the diurnal component ***,the vertical structure is almost homogeneous in winter.

关键词： northern Huanghai Sea residual current tidal wave low-pass filtering

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Toward understanding the microstructure characteristics,phase selection and magnetic properties of laser additive manufactured Nd-Fe-B permanent magnets

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International Journal of Extreme Manufacturing 2024年第1期6卷 277-294页

作者： Bo yao Nan Kang Xiangyu li Dou li Mohamed EL Mansori Jing Chen Haiou Yang Hua Tan Xin {3. state key {2. of So{3.diffcation Processing Northwestern Polytechnical UniversityXi’anShaanxi 710072People’s Republic of China Arts et Metiers institute of Technology MSMPHESAM UniversitéF-51006 Chˆalons-en-ChampagneFrance key laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT ChinaNorthwestern Polytechnical UniversityXi’anShaanxi 710072People’s Republic of China Texas A&M Engineering Experiment Station Institute for Manufacturing SystemsCollege StationTX 77843United States of America

Nd-Fe-B permanent magnets play a crucial role in energy conversion and electronic *** essential magnetic properties of Nd-Fe-B magnets,particularly coercivity and remanent magnetization,are significantly infuenced by the phase characteristics and *** this work,Nd-Fe-B magnets were manufactured using vacuum induction melting(VIM),laser directed energy deposition(LDED)and laser powder bed fusion(LPBF)*** evolution and phase selection of Nd-Fe-B magnets were then clarified in *** results indicated that the solidification velocity(V)and cooling rate(R)are {{3. factors in the phase *** terms of the VIM-casting Nd-Fe-B magnet,a large volume fraction of theα-Fe soft magnetic phase(3..7 vol.%)and Nd{3.e17Bxmetastable phase(3..7 vol.%)areformed due to the low R({3.3.10-1?C s-1),whereas only a minor fraction of the Nd{3.e14B hard magnetic phase(5.15 vol.%)is *** the LDED-processed Nd-Fe-B deposit,although the Nd{3.e14B hard magnetic phase also had a low value(3.4 vol.%)as the values of V(3. s-1)and R(5.06×103.C s-1)increased,part of theα-Fe soft magnetic phase(3..7vol.%)is suppressed,and a higher volume of Nd{3.e17Bxmetastable phases(47.5 vol.%)*** a result,both the VIM-casting and LDED-processed Nd-Fe-B deposits exhibited poor magnetic *** contrast,employing the high values of V(>10-{3. s-1)and R(1.45×106?C s-1)in the LPBF process resulted in the substantial formation of the Nd{3.e14B hard magnetic phase(55.8 vol.%)directly from the liquid,while theα-Fe soft magnetic phase and Nd{3.e17Bxmetastable phase precipitation are suppressed in the LPBF-processed Nd-Fe-B ***,crystallographic texture analysis reveals that the LPBF-processedNd-Fe-B magnets exhibit isotropic magnetic ***,the LPBF-processed Nd-Fe-B deposit,exhibiting a coercivity of 656 k A m-1,remanence of 0.79 T and maximum energy product of 71.5 k J m-3.achieved an acceptable magnetic perfor

关键词： laser additive manufacturing(LAM) Nd-Fe-B permanent magnets numerical simulation microstructure magnetic properties

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高准确度的钙离子光频标

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物理学报 2018年第16期67卷 155-164页

作者：管桦黄垚李承斌高克林中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室武汉430071 中国科学院武汉物理与数学研究所中国科学院原子频标重点实验室武汉430071 中国科学院冷原子物理中心(武汉) 武汉430071

近年来,冷原子技术和激光技术促进了高精度光频标的发展,有望在建立时间基准、推动基础研究和满足国家需求等方面发挥重要的作用.本文介绍了中国科学院武汉物理与数学研究所近年来在高准确度钙离子(^(40)Ca^+)光频标研究方面的进展:采... 详细信息

近年来,冷原子技术和激光技术促进了高精度光频标的发展,有望在建立时间基准、推动基础研究和满足国家需求等方面发挥重要的作用.本文介绍了中国科学院武汉物理与数学研究所近年来在高准确度钙离子(^(40)Ca^+)光频标研究方面的进展:采用新的ULE腔系统,实现了72. nm钟跃迁激光器1—100 s的频率稳定度均优于2.10^(-15),通过对外场和环境效应的控制及克服,特别是囚禁离子运动效应的抑制,获得单个钙离子光频标的不确定度优于5.5×10^(-17);通过两台光频标的比对,测得2.000 s的稳定度也进入10^(-17)量级;基于高精度钙离子光频标平台,进行了相关精密测量的工作,包括:基于全球定位系统的超高精度远程光频绝对值测量方案,第二次测量了钙离子的光频跃迁绝对值,该测量结果再次被国际时间频率咨询委员会采纳,更新了钙离子的频率推荐值;精确测量了钙离子的钟跃迁魔幻波长,由此提出新型的全光囚禁离子光频标的方法;精密测量了钙离子的亚稳态寿命等参数.以上工作推动了基于冷原子的精密测量工作.

关键词：光频标精密测量钙离子魔幻波长

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Nasal vaccination of triple-RBD scaffold protein with flagellin elicits long-term protection against SARS-CoV-{3.variants including JN.1

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Signal Transduction and Targeted Therapy 2024年第5期9卷 2312-2323页

作者： Xian li Mengxin Xu Jingyi Yang li Zhou {2. liu Min li Shasha Wang Mei-Qin liu Zhixiang Huang Zhen Zhang Shuning liu Yunqi Hu Haofeng {2. Bowen liu ying Sun Qingguo Wu Zheng-li shi Ke Lan Yu Chen Huimin Yan {12.-Qing Chen Wuhan institute of Virology Chinese Academy of SciencesWuhanChina Vaccine and Immunology Research Center Translational Medical Research InstituteShanghai Public Health Clinical CenterFudan UniversityShanghaiChina University of chinese academy of sciences BeijingChina School of Public Health(Shenzhen) Shenzhen Campus of Sun Yat-sen UniversityShenzhenGuangdongChina state key {2. of Virology Modern Virology Research CenterCollege of Life SciencesWuhan UniversityWuhanChina Aerosol Bio-Tech(Suzhou)Co. LTDSuzhouJiangsuChina national Medical Products Administration key {{3. for Quality Monitoring and Evaluation of Vaccines and Biological Products Sun Yat-sen UniversityGuanzhouChina

Developing a mucosal vaccine against SARS-CoV-2.is critical for combatting the ***,we investigated long-term immune responses and protection against SARS-CoV-2.for the intranasal vaccination of a triple receptor-binding domain(RBD)scaffold protein(3.-NC)adjuvanted with a flagel{3. protein(KFD)(3.-NC+KFDi.n).In mice,the vaccination elicited RBD-specific broad-neutralizing antibody responses in both serum and mucosal sites sustained at high level over a *** long-lasting humoral immunity was correlated with the presence of long-lived RBD-specific IgG-and IgA-producing plasma cells,alongside the Th17 and Tfh17-biased T-cell responses driven by the KFD *** upon these prec{3.ical findings,an open labeled c{3.ical trial was conducted in individuals who had been primed with the inactivated SARS-CoV-2.IAV)*** a favorable safety profile,the 3.-NC+KFDi.n boost elicited enduring broad-neutralizing IgG in plasma and IgA in salivary *** meet the challenge of frequently emerged variants,we further designed an updated triple-RBD scaffold protein with mutated RBD combinations,which can induce adaptable antibody responses to neutralize the newly emerging variants,including *** findings highlight the potential of the KFD-adjuvanted triple-RBD scaffold protein is a promising prototype for the development of a mucosal vaccine against SARS-CoV-2.infection.

关键词： vaccination vaccine sustained

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Chiral helically grooved gold nanoarrows for concurrently enhancing oxygen and hydrogen evolution from electrochemical water splitting

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Science china chemistry 2024年第11期67卷 3767-3776页

作者： Lufei Huang Tao Wang ying li Ping Wang Rui Tian Baowen Zhou {2. {3. china-UK Low Carbon College Shanghai Jiao Tong University Electron Microscopy laboratory School of Physics Peking University state key {2. for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of Physics Peking University key laboratory for Power Machinery and Engineering of Ministry of Education Research Center for Renewable Synthetic FuelSchool of Mechanical Engineering Shanghai Jiao Tong University

Electrocatalytic water splitting shows a tremendous promise for storing green and intermittent electricity into storable fuels,paving a sustainable way toward carbon neutrality. The exploration of a bifunctional electrocatalyst for simultaneously enhancing oxygen evolution reaction and hydrogen evolution reaction is at the core yet remains a grand challenge, especially operated in the same electrolyte. In this work, mesoscale gold nanoarrows with special chiral morphology are synthesized for electrocatalytic water splitting. In the same electrolyte of 1 M KOH aqueous solution, the as-designed chiral R-/L-helically grooved gold nanoarrows（R-/L-heli GNAs） demonstrated significantly enhanced performance in both hydrogen evolution reaction and oxygen evolution reaction with overpotentials of 186 and 3.5 m V at 10 m A cm-2. respectively, compared to the achiral counterpart. For oxygen evolution reaction, the performance is even comparable to commercial notable metal catalysts,i.e., RuO2. of which the overpotential is 3.0 m V under the same measured conditions. The spin-polarized con{13.ctive atomic force microscope（c-AFM）, finite-difference time-domain simulation, in combination with electrochemical investigations, show that the chirality of R-/L-heli GNAs makes a substantial contribution toward the remarkable performance by enhanced electric field distribution for hydrogen evolution reaction and by tuning the spin states of the electrons for oxygen evolution *** study presents an encouraging strategy for simultaneously promoting hydrogen evolution reaction and oxygen evolution reaction that operated in the same electrolyte by imparting chirality toward a mesoscale inorganic electrocatalyst, showing a grand promise for opening up a new way for electrocatalytic water splitting toward green hydrogen.

关键词： chirality electron spin water splitting hydrogen evolution reaction oxygen evolution reaction

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Organic ligand nanoarchitectonics for BiVO_(4) photoanodes surface passivation and cocatalyst grafting

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Nano Research 2024年第5期17卷 3667-3674页

作者： Jingyi lin Xin li Zhiliang Wang Runlu liu Hui Pan Yixin Zhao lingti Kong yao li Shenmin Zhu lianzhou Wang state key {2. of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Nanomaterials Centre School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnologythe University of QueenslandQLD 4072Australia School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Hubei key laboratory of Plasma {2. and Advanced Materials Wuhan Institute of TechnologyWuhan 430205China

Bismuth vanadate(BiVO_(4))is a promising photoanode material for efficient photoelectrochemical(PEC)water splitting,whereas its performance is inhibited by detrimental surface *** solve the problem,herein,a low-cost organic molecule 1,3.5-benzenetricarboxylic acid(BTC)is selected for surface passivation of BiVO_(4) photoanodes(BVOs),which also provides bonding sites for Co^(2.)to anchor,resulting in a Co-BTC-BVO *** to its strong coordination with metal ions,BTC not only passivates surface {2.s of BVO,but also provides bonding between BVO and catalytic active sites(Co^(2.))to form a molecular *** study and interfacial charge kinetic investigation reveal that chemical bonding formed at the interface greatly suppresses charge recombination and accelerates charge *** obtained Co-BTC-BVO photoanode exhibits a photocurrent density of 4.82.mA/cm^(2. at 1.2. V *** hydrogen electrode(RHE)and a low onset potential of 0.2. VRHE under AM 1.5 G illumination,which ranks among the best photoanodes coupled with Co-based *** work presents a novel selection of passivation layers and emphasizes the significance of interfacial chemical bonding for the construction of efficient photoanodes.

关键词： bismuth vanadate photoanode water splitting surface passivation bridging ligands

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