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Organocatalytic dynamic kinetic resolution of N-arylindole lactams:atroposelective construction of axially chiral amino acids bearing a C–N chiral axis

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Science China Chemistry 2022年第5期65卷 905-911页

作者： Xianfang Hong Jingcheng Guo Jinhua Liu Wei Cao Chenlong Wei Ye Zhang Xiaoxiang Zhang Zhenqian Fu key laboratory of Flexible Electronics&Institute of Advanced Materials Nanjing Tech UniversityNanjing 211816China Jiangsu Co-Innovation Center of Efficient Processing and utilization of Forest resources College of Chemical EngineeringNanjing Forestry UniversityNanjing 210037China Ningbo Institute Chongqing Technology Innovation CenterFrontiers Science Center for Flexible Electronics(FSCFE)Northwestern Polytechnical UniversityXi’an 710072China

Organocatalytic dynamic kinetic resolution of configurationally labile cyclic molecules represents one of the most efficient methods for the atroposelective construction of axially chiral molecules bearing a tetra-ortho-substituted chiral ***,this privileged strategy is limited to constructing a C–C chiral ***,organocatalytic dynamic kinetic resolution of configurationally labile N-arylindole lactams has been successfully achieved at the first time,allowing for access to a structurally diverse set of axially chiral N-arylindole amino esters with a tetra-ortho-substituted C–N chiral axis in excellent yields and *** addition to the N-arylindole skeleton,N-aryl thieno[3,2-b]pyrrole,furo[3,2-b]pyrrole,and pyrrolo[2,3-b]pyridine skeletons are also compatible with this *** transition-metal-free facile strategy features a broad substrate scope,mild reaction conditions,easy scale-up and excellent atom *** potentially valuable molecules,such as axially chiral peptides,were efficiently generated from the resulting configurationally stable axially-chiral N-arylindole amino esters,demonstrating the power of this strategy.

关键词： axially chiral amino acids C–N chiral axis dynamic kinetic resolution N-arylindole lactams organocatalysis

Single-cell RNA sequencing reveals a hierarchical transcriptional regulatory network of terpenoid biosynthesis in cotton secretory glandular cells

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Molecular Plant 2023年第12期16卷 1990-2003页

作者： Jia-Ling Lin Longxian Chen Wen-Kai Wu Xiao-Xiang Guo Cheng-Hui Yu Min Xu Gui-Bin Nie Jun-ling Dun Yan Li Baofu Xu Ling-Jian Wang Xiao-Ya Chen Wei Gao Jin-Quan Huang State key laboratory of Plant Molecular Genetics CAS Center for Excellence in Molecular Plant SciencesShanghai Institute of Plant Physiology and EcologyUniversity of CASChinese Academy of SciencesShanghai 200032China School of Life Science and Technology ShanghaiTech UniversityShanghai 200031China chongqing key laboratory of Micro-Nano Systems and Intlligent Transduction Collaborative InnovationNational Research Base of Inteligent Manufacturing ServiceChongqing Technology and Business UniversityChongqing 400067China Analytical Applications Center Shimadzu(China)Co.Ltd.Shanghai 200233China Shandong laboratory of Yantai Drug Discovery Bohai Rim Advanced Research Insttute for Drug DiscoveryYantai 264117ShandongChina State key laboratory of Drug Research Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China Shanghai key laboratory of Plant Functional Genomics and resources Shanghai Chenshan Botanical GardenShanghai 201602China National key laboratory of Cotton Bio-breeding and Integrated utilization(Henan University) Henan 475004China

Plants can synthesize a wide range of terpenoids in response to various environmental ***,the specific regulatory mechanisms governing terpenoid biosynthesis at the cellular level remain largely *** this study,we employed single-cell RNA sequencing to comprehensively characterize the transcriptome profile of cotton leaves and established a hierarchical transcriptional network regulating cellspecific terpenoid *** observed substantial expression levels of genes associated with the biosynthesis of both volatile terpenes(such asβ-caryophyllene andβ-myrcene)and non-volatile gossypol-type terpenoids in secretory glandular ***,two novel transcription factors,namely GoHSFA4a and GoNAC42,are identified to function downstream of the Gossypium PIGMENT GLAND FORMATION *** transcription factors could directly regulate the expression of terpenoid biosynthetic genes in secretory glandular cells in response to developmental and environmental *** convenient retrieval of the single-cell RNA sequencing data generated in this study,we developed a user-friendly web *** findings not only offer valuable insights into the precise regulation of terpenoid biosynthesis genes in cotton leaves but also provide potential targets for cotton breeding endeavors.

关键词： hierarchical network cotton

Fourth Environment-Enhancing Energy(E^(2)-Energy)Conference in Beijing,China,July 8-10,2016

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International Journal of Agricultural and Biological Engineering 2017年第1期10卷 256-258页

作者： Liu Zhidan Yuanhui Zhang B.Brian He Liao Qiang laboratory of Environment-Enhancing Energy(E2E) Key Laboratory of Agricultural Engineering in Structure and EnvironmentMinistry of AgricultureCollege of Water Resources and Civil EngineeringChina Agricultural UniversityBeijing100083China Department of Agricultural and Biological Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Department of Biological Engineering University of IdahoMoscowIdaho 83844USA key laboratory of Low-grade Energy utilization Technologies and Systems Chongqing UniversityMinistry of EducationChongqing 400030China

The paradigm of Environment-Enhancing Energy(E2-Energy)is to produce renewable energy and chemicals from biowastes and biomass,and simultaneously improve the environment by reusing nutrients,capturing carbon and cleaning *** 1st E2-Energy Forum was initiated in 2010,Beijing,by Professor Yuanhui Zhang,University of Illinois at Urbana-Champaign(UIUC),China Agricultural University(CAU)and Zhejiang University(ZJU).The forum has grown to a biannual international conference in 2012 in Shanghai,and 2014 in *** 4th E2-Energy Conference was jointly organized by CAU,UIUC and chongqing University,and convened at CAU International Conference Center,Beijing,China on July 6-8,*** conference was financially supported by the National Natural Science Foundation of China(5151101167,U1562107 and 51576206),the Bill&Melinda Gates Foundation(RTTC-C-R2-01-001)and Beijing Scienceand Technology Program(Z161100001316009).

关键词： chongqing jointly Agricultural

Wettability between titanium-containing steels and TiN ceramic substrate

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Journal of Iron and Steel Research International 2023年第4期30卷 677-686页

作者： Ya-cen Deng Hao Liu Min Zhang Xu-bin Zhang Qiang-qiang Wang Sheng-ping He College of Materials Science and Engineering Chongqing Key Laboratory of Vanadium–Titanium Metallurgy and Advanced MaterialsChongqing UniversityChongqing 400044China Institute of Material Engineering and Technology Pangang Group Research Institute Co.Ltd.Panzhihua 617000SichuanChina

The wettability between TiN ceramic substrates and steels with various Ti contents was studied under an argon atmosphere at 1550℃ using a modified sessile drop *** electron probe microanalyzer and thermodynamic calculations were applied to investigate the interface between the steels and the TiN substrates as well as the surface of solidified steel *** measured apparent contact angles between the TiN substrates and steels were 96°,91°,and 146°,as the Ti content in the steel samples was 0.01,0.31,and 0.68 wt.%,*** reaction products were found at the interface,and only physical interactions *** wettability between high titanium steels(0.68 wt.%Ti)and TiN ceramic substrates should be evaluated from various perspectives,as many TiN particles existing in steel made the apparent contact angle increased significantly,deviating from the true value of contact angle.

关键词： Wettability Contact angle High-Ti steel TiN ceramic

utilization of unmodified gold nanoparticles in colorimetric detection

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Science China(Physics,Mechanics & Astronomy) 2011年第10期54卷 1757-1765页

作者： HE Sha LIU DingBin WANG Zhuo CAI KaiYong JIANG XingYu College of Bioengineering Chongqing University Chongqing 400044 China Chinese Academy of Sciences key laboratory for Biological Effects of Nanomaterials and Nanosafety National Center for NanoScience and Technology Beijing 100190 China

This review begins with an overview of the appealing properties and various applications of gold nanoparticles, and briefly summarizes recent advances in using unmodified gold nanoparticles to detect different kinds of targets including nucleic acids, proteins, metal ions and small organic molecules. The key point to the unmodified gold nanoparticle-based visual detection assay is to control dispersion and aggregation of colloidal nanoparticles by targets of interest, which usually relies on affinities between gold nanoparticles and targets. The degree of dispersion or aggregation can be visualized through the change of the solution color or the precipitation of nanoparticles from the solution. Thus, the existence of the target molecules can be trans-lated into optical signals and monitored by the naked eye conveniently. Finally, some future prospects of this research field are given.

关键词： gold nanoparticles colorimetric detection biosensor

Synergistic integration of metallic Bi and defects on BiOI: Enhanced photocatalytic NO removal and conversion pathway

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Chinese Journal of Catalysis 2019年第6期40卷 826-836页

作者： Minglu Sun Wendong Zhang Yanjuan Sun Yuxin Zhang Fan Dong chongqing key laboratory of Catalysis and New Environmental Materials College of Environment and ResourcesChongqing Technology and Business UniversityChongqing 400067China chongqing key laboratory of Inorganic Functional Materials Department of Scientific Research ManagementChongqing Normal UniversityChongqing 401331China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Research Center for Environmental Science & Technology Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu 611731China

Surface plasmon resonance(SPR)of metals may provide a way to improve light absorption and utilization of semiconductors,achieving better solar light conversion and photocatalysis *** study uses the advantages of SPR in metallic Bi and artificial defects to cooperatively enhance the photocatalytic performance of *** catalysts were prepared by partial reduction of BiOI to form Bi@defective BiOI,which showed highly enhanced visible photocatalytic activity for NOx *** effects of reductant quantity on the photocatalytic performance of Bi@defective BiOI were *** as-prepared photocatalyst(Bi/BiOI-2)using 2 mmol of reductant NaBH4 showed the most efficient visible light photocatalytic *** enhanced activity can be ascribed to the synergistic effects of metallic Bi and oxygen *** electrons from the valence band tend to accumulate at vacancy states;therefore,the increased charge density would cause the adsorbed oxygen to transform more easily into superoxide radicals and,further,into hydroxyl *** radicals are the main active species that oxidize NO into final *** SPR effect of elemental Bi enables the improvement of visible light absorption efficiency and the promotion of charge carrier separation,which are crucial factors in boosting *** adsorption and reaction processes on Bi/BiOI-2 were dynamically monitored by in situ infrared spectroscopy(FT-IR).The Bi/BiOI photocatalysis mechanism co-mediated by elemental Bi and oxygen vacancies was proposed based on the analysis of intermediate products and DFT *** present work could provide new insights into the design of high-performance photocatalysts and understanding of the photocatalysis reaction mechanism for air-purification applications.

关键词： Surface plasmon resonance Bi metal BiOI Photocatalysis Oxygen vacancy Reaction mechanism

Policy Network-Based Dual-Agent Deep Reinforcement Learning for Multi-Resource Task Offloading in Multi-Access Edge Cloud Networks

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China Communications 2024年第4期21卷 53-73页

作者： Feng Chuan Zhang Xu Han Pengchao Ma Tianchun Gong Xiaoxue School of Communications and Information Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China Institute of Intelligent Communication and Network Security Chongqing University of Posts and TelecommunicationsChongqing 400065China key laboratory of Big Data Intelligent Computing Chongqing University of Posts and TelecommunicationsChongqing 400065China School of Information Engineering Guangdong University of TechnologyGuangzhou 510006China

The Multi-access Edge Cloud(MEC) networks extend cloud computing services and capabilities to the edge of the networks. By bringing computation and storage capabilities closer to end-users and connected devices, MEC networks can support a wide range of applications. MEC networks can also leverage various types of resources, including computation resources, network resources, radio resources,and location-based resources, to provide multidimensional resources for intelligent applications in 5/***, tasks generated by users often consist of multiple subtasks that require different types of resources. It is a challenging problem to offload multiresource task requests to the edge cloud aiming at maximizing benefits due to the heterogeneity of resources provided by devices. To address this issue,we mathematically model the task requests with multiple subtasks. Then, the problem of task offloading of multi-resource task requests is proved to be NP-hard. Furthermore, we propose a novel Dual-Agent Deep Reinforcement Learning algorithm with Node First and Link features(NF_L_DA_DRL) based on the policy network, to optimize the benefits generated by offloading multi-resource task requests in MEC networks. Finally, simulation results show that the proposed algorithm can effectively improve the benefit of task offloading with higher resource utilization compared with baseline algorithms.

关键词： benefit maximization deep reinforcement learning multi-access edge cloud task offloading

Spatial and temporal patterns of amphibian species richness on Tianping Mountain,Hunan Province,China

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Zoological Research 2020年第2期41卷 182-187页

作者： Wen-Bo Zhu Chun-Lin Zhao Chun-Lin Liao Bei Zou Dan Xu Wei Zhu Tian Zhao Jian-Ping Jiang CAS key laboratory of Mountain Ecological Restoration and Bioresource utilization&Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan ProvinceChengdu Institute of BiologyChinese Academy of SciencesChengduSichuan 610041China University of Chinese Academy of Sciences Beijing 100049China key laboratory of Southwest China Wildlife resources Conservation(Ministry of Education) China West Normal UniversityNanchongSichuan 637009China National Nature Reserve of Badagongshan SangzhiHunan 427100China College of Animal Science and Technology Southwest UniversityChongqing 400715China

DEAR EDITOR,Exploring species richness patterns across space and time can help in understanding species distribution and in formulating conservation *** taxa,amphibians are of utmost importance as they are highly sensitive to environmental changes due to their unique life histories(Zhong et al.,2018).Here,we investigated the spatial and temporal patterns of amphibian species richness on Tianping Mountain in ***,we established 10 transects at low to high elevations,and sampled amphibians in April,June,August,and October *** results demonstrated that amphibian species composition and richness varied significantly at both spatial and temporal scales and were associated with gradients of environmental change in microhabitats on Tianping Mountain.

关键词： Hunan Spatial ping

Change and control of nitrogen in molten steel production process

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Journal of chongqing University 2014年第1期13卷 11-16页

作者：熊爽 ZENG Hui CAO Yang WANG Qing-xiang key laboratory for Ferrous Metallurgy and resources utilization of Ministry of Education Wuhan University of Science and Technology

The change and control of nitrogen content in molten steel was investigated through the production process of "LDBAr-LF-RH-CC". Results show that nitrogen content reduces gradually in converter-steelmaking stage, rises rapidly from the end of converter process to the end of argon station process, continues to increase in ladle furnace process, and decreases slightly in RH refining stage. Since nitrogen is removed mainly by BOF steelmaking and vacuum refining operations, nitrogen in molten steel should be removed as much as possible in these two operations. However, nitrogen uptake should be minimized in other operations of molten steel production process.

关键词： molten steel production process nitrogen content change control