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QCM Detection of Adhesion, Spreading and Proliferation of Human Breast Cancer Cells (MCF-7) on a Gold Surface

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Chinese Chemical Letters 2006年第4期17卷 509-512页

作者： Xue En jiA Zhi Wei ZHANG Liang TAN You Yu ZHANG qing ji xie Zhi Min HE Shou Zhuo YAO Key Laboratory of Chemical Biology ＆ Traditional Chinese Medicine Research （Ministry of Education） College of Chemistry and Chemical Engineering Hunan Normal University Changsha 410081 Cancer Research Institute Xiangya Medical College Central South University Changsha 410078

The quartz crystal microbalance （QCM） was used to monitor the one-day incubation of human breast cancer cells （MCF-7） on the gold electrode. In combination with an optical microscope simulation experiment, the cell-population pictures at various stages, the QCM responses to the cells＇ adhesion, spreading and proliferation on the electrode surface were discussed. The △f0 and △R1 responses were found mainly from mixed effects of viscodensity and surface stress, and in proportion to the cell coverage, rather than to the number of cells at the electrode. The significant fore-and-aft changes in cyclic voltammetry and electrochemical impedance spectroscopy of the ferri-ferrocyanide redox couple also proved that the cells were adhesion to the gold surface.

关键词： Quartz crystal microbalance optical microscopy cyclic voltammetry electrochemical impedance spectroscopy human breast cancer cells (MCF-7).

A Study on a Partially Immersed Gold Electrode Using an Electrochemical Quartz Crystal Impedance System

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Chinese Chemical Letters 2000年第9期11卷 809-812页

作者： qing ji xie You Yu ZHANG Ming SUN Ling YI Shou Zhuo YAO Chemical Research Institute, Hunan Normal University, Changsha 410081 Chemical Research Institute Hunan Normal University Changsha 410081 China

The electrochemical quartz crystal impedance system (EQCIS) has been used for the study of a partially immersed Au electrode in 0.2 mol/L NaClO4 aqueous solution. The influences of the immersed area and height of the electrode on the EQCIS responses were evaluated, showing the highest response sensitivity to liquid loading at the center of the piezoelectric quartz crystal electrode. The increase in the immersed height of the Au electrode at oxygen reduction potentials during potential cycling was measured by this technique.

关键词： electrochemical quartz crystal impedance system (EQCIS) equivalent circuit parameters electrochemical impedance partially immersed Au electrode

A Gold Electrode QCM Study on the Self-Assembling Process of Thioglycollic Acid in Aqueous Solution

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Chinese Chemical Letters 1998年第3期9卷 307-310页

作者： qing ji xie You Yu ZHANG Da Zhong SHEN(Department of Chemistry, Center of Analyses and Tests, Hunan Normal University,Changsha 410081)(Department of Chemistry, Shandong University, jinan 250000) Department of Chemistry Hunan Normal University Changsha 410081 China Center of Analyses and Tests Hunan Normal University Changsha 410081 China Department of Chemistry Shandong University Jinan 250000 China

In this letter, the self-assembling process of thioglycollic acid on gold in aqueous solutions was studied by QCM technique. Frequency information suggests bilayer or multilayer adsorbate formation in 0.5 mol/L HCl so... 详细信息

关键词： gold electrode QCM self-assembling process thioglycollic acid

Electropolymerization of 4-Aminothiophenol Self-AssembledMonolayer on Au Electrode

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Chinese Chemical Letters 1999年第1期10卷 63-66页

作者： qing ji xie Xiao Lan GU You Yu ZHANG Man Cai XU Ming MA(Chemistry Department, Hunan Normal University, Changsha 410081)(Center of Analysis & Test. Hunan Normal University. Changsha 410081) Chemistry Department Hunan Normal University Changsha 410081 China Center of Analysis and Test Hunan Normal University Changsha 410081 China

In this letter. we report that oxidation of 4-aminothiophenol self-assembled monolayeron An electrode produces a couple of redox current peaks with close peak potentials in 0.5 mol/LHCIO4 aqueous solution, and the peaks are ascribed to an electroactive *** properties of the monolayer polymer were investigated with use ofelectrochemical quartz crystal microbalance and cyclic voltammetry.

关键词： Molecular self-assembly monolayer polymer 4-aminothiophenol EQCM

In Situ Acquisition of Equivalent Circuit Parameters of Crystal Resonance during Copper Deposition and Dissolution in Acidic Solution by Electrochemical Quartz Crystal Impedance System

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Chinese Chemical Letters 1999年第1期10卷 73-76页

作者： qing ji xie Xiao Lian SUN Xiao Lan GU Hong Wei LIU You Yu ZHANG Shou Zhuo YAO(Chemical Research Institute. Hunan Normal University,Changsha 410081)(Chemistry Department,Hunan Normal University, Changsha 410081) Chemical Research Institute Hunan Normal University Changsha 410081 China Chemistry Department Hunan Normal University Changsha 410081 China

Electrochemical quartz crystal impedance system (EQCIS) which allows in situ dynamic quartz crystal impedance measurement in an electrochemical experiment was developed by combining an HP 4395A Network/Spectrum/Impedance analyzer with an EG&G M283 potentiostat. Equivalent circuit parameters of crystal resonance change significantly during electrodeposition and dissolution of copper in 0.1 mol/L H2SO4 aqueous solution in a cyclic potential sweep experiment, which is explained with an overall picture of mass loading, solution density and viscosity, etc..

关键词： in situ quartz crystal impedance measurement equivalent circuit parameters electrodeposition copper

THE SENSITIVITY OF RESPONSE SIGNAL OF SPECTROELECTROCHEMISTRY(SEC)

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Chinese Chemical Letters 1992年第6期3卷 465-466页

作者： Yuan Bao ZHU qing ji xie Lian Hong CHEN Shuang E HE Department of Chemistry and Chemical Engineering, Hunan University, Changsha 410082.

In this paper, we propose the use of the molar absorbance/ potential ratio to measure quantitatively the sensitivity of response signal of SEC cell and the system under study. A simple equation was developed, and the major factors influencing the sensitivity were also assessed. The results obtained this way were in good agreement with actual cases.

关键词： SEC THE SENSITIVITY OF RESPONSE SIGNAL OF SPECTROELECTROCHEMISTRY length

Prospects on mangrove knowledge services in the smart era: From plant atlas to knowledge graphs

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Science China Earth Sciences 2025年第1期68卷 111-127页

作者： Zhi-Wei HOU Wenlong jiNG Cheng-Zhi QIN ji YANG qing XIA Xiaoling YIN Key Laboratory of Guangdong for Utilization of Remote Sensing and Geographical Information System Guangdong Open Laboratory of Geospatial Information Technology and Application Guangzhou Institute of Geography Guangdong Academy of Sciences Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences College of Resources and Environment University of Chinese Academy of Sciences School of Traffic & Transportation Engineering Changsha University of Science and Technology

Mangroves are crucial to the ecological security of the Earth and human well-being. Their management, conservation, and restoration are of great importance and necessitate the support of spatio-temporal information and multidisciplinary knowledge such as biology and ecology. Traditional knowledge services such as plant atlas provide illustrated textual knowledge of mangroves. However, this kind of service is oriented to information retrieval and is incapable of effectively mining and utilizing fragmented knowledge from multi-source heterogeneous data, facing the problem of “massive data, rare knowledge”. Knowledge graphs are capable of extracting, organizing, and fusing the knowledge contained in massive data into semantic networks that can be understood and computed by computers. They provide a solution for the realization of intelligent knowledge services. Focusing on the urgent need for mangrove knowledge acquisition, formal representation, and intelligent services, this paper proposes a research prospect on mangrove knowledge graphs and knowledge services. We first analyze the similarities and differences between various domain-specific concepts of Tupu. On this basis, we define the mangrove knowledge graph as a large-scale knowledge base that integrates multi-disciplinary knowledge and spatio-temporal information with mangrove ecosystems as the core. Then, we propose a research framework for mangrove knowledge services that can realize the transformation from multi-modal data to intelligent knowledge services, including multiple research levels such as ubiquitous data sensing and aggregation, knowledge organization and graph construction, and intelligent mangrove knowledge services. Subsequently, the methods and workflow for constructing mangrove knowledge graphs are introduced. Finally, we discuss the challenges and possible future directions of mangrove knowledge services in the smart era, including the construction of a mangrove knowledge system that integra

关键词： Mangrove Tupu Knowledge graph Multi-modal Knowledge service

A Study on Adsorption of Electrogenerated Cystine Precipitate onto An Electrode using Electrochemical Quartz Crystal Impedance System

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Chinese Chemical Letters 1999年第12期10卷 0-0,0-0页

作者： You Yu ZHANG qing ji xie Yang Hui GUO Xiang Jun WANG Shou Zhuo YAO(Chemical Research Institute. Hunan Normal University, Changsha 410081)

An electrochemical quartz crystal impedance system has been applied to monitorgeneration of precipitate and adsorption of the precipitate onto An electrode during electrochmicaloxidation and Fe(CN)_6,3-/Fe(CN),6 4- electrochemical catalytic oxidation of L-cysteine in phosphateaqueous buffer (pH 7.4). Significant decreases in the resonant frequency and increases in themotional resistance and the static capacitance were found during the precipitate adsorption, and thefrequency shift found in solution was ca. 2 times that in air. Similar responses of quartz crystalimpedance and a white precipitate were obtained during redox titration of L-cysteine solutionusing K_3Fe(CN)_6 solution. FT-IR analysis indicated that the white precipitate is cystine. Theelectrode collection efficiency of the electrogenerated cystine was estimated.

关键词： Electrochemical quartz crystal impedance system adsorption of electrogeneratedprecipitate. cystine/cysteine Fe(CN)_6 3-/Fe(CN)_6,4-.

Trinuclear gold-catalyzed site-selective alkylation of peptides

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Science China Chemistry 2025年第1期68卷 249-256页

作者： qing-Yun Fang Chengyihan Gu Yinghan Chen Wencheng Yan Yong Liang Weipeng Li Chengjian Zhu jie Han jin xie State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials Chemistry and Biomedicine Innovation Center (Chem BIC) School of Chemistry and Chemical Engineering Nanjing University Green Catalysis Center College of Chemistry Zhengzhou University State Key Laboratory of Natural Medicines China Pharmaceutical University

Selective modification of peptides has always been a challenging issue. The selective alkylation of peptides can alter the biological activity and physical properties of molecules, and it has gained significant research interest. We herein disclose an intriguing gold-catalyzed alkylation of peptides using bench-stable unactivated alkyl bromides under photoredox catalysis. A wide range of structurally diverse primary, secondary and tertiary alkyl bromides serve as effective coupling partners to precisely connect with the α-C(sp3)–H in glycine residue of peptides. This protocol demonstrates an exceptionally broad scope for alkyl halides and excellent tolerance for a wide range of useful functional groups. A series of relay transformations to construct cyclic peptides, to proceed click reaction and to realize peptide fluorescence labeling further enhance its synthetic practicality. In addition, mechanistic studies and density functional theory(DFT) calculations reveal an inner-sphere and subsequent outersphere single electron transfer(SET) mechanism.

关键词： gold catalysis peptide alkylation C-C coupling radical

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