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Ultrafast cyclic voltammetry with asymmetrical potential scan

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Chinese Chemical Letters 2008年第1期19卷 85-88页

作者： zhi yong guo Xiang Qin Lin Faculty of Materials Science and Chemical Engineering The State Key Laboratory Base of Novel Functional Materials and Preparation Science Ningbo University Ningbo 315211 China Department of Chemistry University of Science and Technology of China Hefei 230026 China

Based on the perfect ohmic drop compensation by online electronic positive feedback, ultrafast cyclic voltammetry with asymmetrical potential scan is achieved for the first time, with the reduction of anthracene acting as the test system. Compared with the traditional cyclic voltammetry utilizing symmetrical triangular waveform as the excitation one, the new method allows a simpler approach to mechanistic analysis of ultrafast chemical reactions coupled with a charge transfer. And perhaps more important, it also provides a way to eliminate the interference of the adsorbed product in dynamic monitoring. 2007 zhi yong guo. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Ultrafast cyclic voltammetry Asymmetrical potential scan MV/s scan rates

Direct Electrochemical Evidence of the Dissociation and Adsorption Behavior of Acetonitrile at Gold Electrodes by Ultrafast Voltammetry

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Chinese Chemical Letters 2006年第4期17卷 513-516页

作者： zhi yong guo Xiang Qin LIN Yan Hui XU Department of Chemistry University of Science and Technology of China Hefei 230026 College of Science Ningbo University Ningbo 315211

Ultrafast cyclic voltammetry was used to study the redox behavior of a gold electrode in acetonitrile. The direct electrochemical evidence of the dissociation and adsorption behavior of acetonitrile at gold electrodes was found. It could be stated that two consecutive redox paths are involved, each with a special adsorption state acting as the reaction intermediate. The mean value, obtained of the electron-transfer rate constant of the second path, was 1.3 × 10^5 s^-1 with a standard deviation of 0.24 × 10^5 s^-1.

关键词： Gold electrode acetonitrile adsorption ultrafast voltammetry.

Tetracycline selective electrode based on molecularly imprinted polymer particles

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Chinese Chemical Letters 2010年第10期21卷 1235-1238页

作者： zhi yong guo Pan Pan Gai Jing Duan Hui Na Zhang Sui Wang Faculty of Materials Science and Chemical Engineering The State Key Laboratory Base of Novel Functional Materials and Preparation Science Ningbo University Ningbo 315211 China

Tetracycline selective electrode using molecularly imprinted polymer particles as quasi-ionophore was constructed the first time, and its performance was carefully characterized. Due to the specific recognition of tetracycline by the particles, the selectivity coefficients for routine interferences were less than 10-4. Benefited from the absence of tetracycline in the sensitive membrane and the optimized composition of the inner filling solution, the limit of detection of the electrode was reduced to about 2.5 × 10^-8 mol/ L. It exhibited a good electrode slope 57.6 mV/decade near the theoretical Nernstian one, with a wide linear working range from 6.0 × 10^-8 to 1.0 × 10^-3 mol/L. The fabricated electrode should be used in pH 2--4, response time of which was less than 200 s when the concentration of tetracycline was higher than 1.0 × 10^-6 mol/L and no more than 30 min at the concentration of 1.0 × 10^-8 mol/L.

关键词： Ion selective electrode Molecular imprinting polymer Quasi-ionophore Tetracycline

Gastrointestinal symptoms: A comparison between patients undergoing peritoneal dialysis and hemodialysis

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World Journal of Gastroenterology 2014年第32期20卷 11370-11375页

作者： Rui Dong zhi-yong guo Jia-Rong Ding Yang-Yang Zhou Hao Wu Department of Nephrology Changhai Hospital Second Military Medical University

AIM: To compare the prevalence and diversity of gastrointestinal (GI) symptoms in patients undergoing peritoneal dialysis (PD) and hemodialysis (HD).

关键词： Gastrointestinal symptom Hemodialysis Peritoneal dialysis End-stage renal disease Constipation Reflux Eating dysfunction Abdominal pain Diarrhea Indigestion

Colorimetric Sensing of Hydrogen Peroxide Based on the Wavelength-Shift of CsPbBr_(3) Perovskite Nanocrystals on Water-Oil Interface

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Journal of Analysis and Testing 2023年第1期7卷 1-7页

作者： Heng-Gan Li Yi-Men Zhu Xue-Lian Liu zhi-yong guo Ya-Ning Huang Xi Chen Department of Civil Engineering and Architecture Wuyi UniversityWuyishan 354300China State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361005China Institute of Analytical Technology and Smart Instruments and College of Environment and Public Healthy Xiamen Huaxia UniversityXiamen 361024China Information Center Xiamen Huaxia UniversityXiamen 361024China

In this study,the halogen exchange reactions are investigated between KI or methylamine iodide in aqueous solution and CsPbBr_(3)NCs in *** mass transfer process on the interface between water and toluene affects the halogen exchange time and e *** and heating can effectively improve the halogen exchange e fficiency and increases the sensing *** photoluminescence wavelength shift of CsPbBr_(3)NCs shows good linear relationship with the concentration of I-in the range from 0 to 20 nmol/L with the detection limit of 0.2 nmol/L I^(-).Taking H_(2)O_(2)as a typical water-soluble oxide,the method is applied to the colorimetric sensing of H_(2)O_(2)in water *** the optimization of sensing conditions,the obvious wavelength shift could be observed with the different concentration range of H_(2)O_(2).A good linear relationship between the wavelength shift and the H_(2)O_(2)concentration from 0 to 1.0 mmol/L with the detection limit of 0.05 mmol/L H_(2)O_(2)could be found.

关键词： Halogen exchange Interface reaction CsPbBr_(3)perovskite nanocrystals Photoluminescence wavelength shift Colorimetric sensing

Graft-verse-host disease after liver transplantation:A report of two cases and review of literature

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World Journal of Gastroenterology 2008年第6期14卷 974-979页

作者： zhi-yong guo Xiao-Shun He Lin-Wei Wu Xiao-Feng Zhu Wei-Qiang Ju Dong-Ping Wang Shen You Yi Ha guo-Dong Wang Jie-Fu Huang Organ Transplantation center First Affiliated Hospital Sun Yat-Scn University Guangzhou 510080 Guangdong Province China

Graft-verse-host disease (GVHD) is an uncommon fatal complication following liver transplantation (LTx). In China's Mainland, only six cases have been reported with a morbidity rate up to 1%-2%. Definitive diagnosis was achieved by molecular techniques (HLA typing or PCR-STR) in only two cases and the remaining cases were diagnosed based on typical clinical features with exclusion of other possible causes. All patients died of septic shock or multiple organ failure even after administration of increased corticosteroids and supportive therapy, and reduced immunosuppressive agents. In our center, two cases of GVHD were found among 128 (1.56%) patients. One case was diagnosed by detecting lymphocyte macrochimerism through DNA-STR. Both of them died even after aggressive treatment. In China, the incidence of GVHD is similar to that reported by foreign centers except for an extremely bad prognosis. Rapid diagnosis is crucial for a better prognosis. In China, only 37.5% of cases are diagnosed by molecular methods. We recommend detecting lymphocyte macrochimerism through DNA-STR to get a rapid diagnosis, and interleukin 2-receptor antibody (basiliximab or daclizumab) therapy seems to be a good choice for the disease.

关键词： Graft-versus-host disease Liver transplantation Prognosis Diagnosis Treatment

Surgical techniques of arterialized orthotopic liver transplantation in rats

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Chinese Medical Journal 2007年第21期120卷 1914-1917页

作者： MA Yi WANG guo-dong guo zhi-yong guo zhi-gang HE Xiao-shun CHEN Gui-hua Organ Transplantation Center First Hospital Sun Yat-sen University Guangzhou 510080 China

Background Recently, much attention has been paid to hepatic artery reconstruction in rat liver transplantation, which can prevent bile duct ischemia and preserve better liver structure. In this study, three methods of graft arterialization, including sleeve, cuff, and stent anastomosis, were conducted and the results were compared. Methods Orthotopic liver transplantation （OLT） with rearterialization was conducted in 90 rats, which were divided into sleeve, cuff, and stent groups （n=30 in each）. Ninety-six rats received OLTs with standardized two-cuff technique without rearterialization as a control. The sleeve technique included an end-to-end anastomosis between the donor common hepatic artery and recipient proper hepatic artery, or between the donor celiac artery and recipient common hepatic artery Cuff technique involved an anastomosis between the donor common hepatic artery and recipient common hepatic artery. In the stent technique, the recipient hepatic artery and donor hepatic artery were connected using an intraluminal polyethylene stent. The arterial anastomosis time and arterial patency rate in each group were recorded. The liver graft survival and bile duct complication rates were measured. Results The total surgical time of OLT with rearterialization was （118.3±12.9） minutes in the sleeve group, （106.2±11.6） minutes in the cuff, （93.8±10.2） minutes in the stent, and （88.2±9.6） minutes in the control. The corresponding anhepatic phase was （19.6±2.8）, （19.2±2.2）, （18.6±1.8）, and （20.0±2.5） minutes respectively in the sleeve, cuff, stent, and control groups. One-week survival rate was 86.5% in the control, and 86.7% in the groups with rearterialization. No significant difference was detected in the survival rate between them （P〉0.05）. The incidence of biliary complications in non-rearterialized group （17.7%） was significantly higher than that in the rearterialized group （6.7%, P〈0.05）. No significant difference was found in the incidence of biliary complic

关键词： liver transplantation rat hepatic rearterialization

Process Analysis and Practice of Clean IF Steel Production

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Journal of Iron and Steel Research International 2011年第S2期18卷 399-405页

作者： TIAN yong, AN Lian-qi, JIAN Long, MAO zhi-yong, guo Meng, WANG Peng, LI Zhen, WEN Tie-guang ( No.3 Steelmaking and Continuous Rolling Plant, Angang Steel Co Ltd, Anshan, 114021,Liaoning,China ) Angang Steel Co Ltd Steelmaking & Continuous Rolling Plant 3 Anshan 114021 Liaoning Peoples R China

Based on the current process and equipment conditions of No.3 steelmaking and continuous rolling plant, which consists of desulphurization and slag skimming of hot metal, 260t combined blown BOF, rimmed steel tapping with slag stopping process, RH-TB vacuum treatment process and medium thin slab continuous casting, the methods for improving cleanliness of IF steel in BOF smelting, RH vacuum treatment and continuous casting were investigated. According to results of theoretical analysis and experiments, a series of quality controlling schemes were proposed for improving cleanliness of IF steel via controlling chemical composition, T[O] content, tapping temperature, shrouded casting and controlling stability of continuous casting.

关键词： IF steel clean steel steelmaking secondary refining continuous casting

Recommendations for prevention and management of COVID-19 in peritoneal dialysis patients

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Chronic Diseases and Translational Medicine 2020年第2期6卷 115-118页

作者： Xue-Li Lai Hai-Yan Wang zhi-yong guo Department of Nephrology Shanghai Changhai HospitalShanghai 200433China

The World Health Organization characterized coronavirus disease(COVID-19)as a pandemic on March 11,*** dialysis patients have a weakened immune system that is associated with a high morbidity of ***,COVID-19 prevention measures and management for patients on peritoneal dialysis are urgent and *** on published research on COVID-19 and previous clinical practices for similar coronavirus outbreaks,we aimed to make recommendations to manage patients undergoing peritoneal dialysis.

关键词： Peritoneal dialysis Novel coronavirus Coronavirus disease 2019 Pneumonia