The Kinetics of Heterogeneous Electron Transfer Reaction in Polar Solvents

Data for heterogeneous electron transfer reactions obtained in the last ten years have been examined within the context of contemporary theory. Special attention is focused on systems for which rate constants and activation parameters are available as functions of solvents and of temperataure. The role of reactant structure in deteriming the kinetic parameters is also considered. Double layer effects both at unmodified and modified electrodes are discussed in detail. Experimental techniques, especially those suited to measuring fast reactions, are also outlined.     

基于“历史复演法”的化学教学设计研究——以“质量守恒定律”为例

化学发展的历史能够作为重要的教学设计资源。将历史上的化学家开展科学研究和解决科学问题的过程，设计为可供课堂教学应用的学生问题，需要经过历史事件考察、学生水平分析、问题转化等步骤。以质量守恒定律为例，探讨了基于“历史复演法”的化学教学设计框架与实施。     

Electrochemical On‐line ICP‐MS in Electrocatalysis Research

Electrocatalyst degradation due to dissolution is one of the major challenges in electrochemical energy conversion technologies such as fuel cells and electrolysers. While tendencies towards dissolution can be grasped considering available thermodynamic data, the kinetics of material's stability in real conditions is still difficult to predict and have to be measured experimentally, ideally in‐situ and/or on‐line. On‐line inductively coupled plasma mass spectrometry (ICP‐MS) is a technique developed recently to address exactly this issue. It allows time‐ and potential‐resolved analysis of dissolution products in the electrolyte during the reaction under dynamic conditions. In this work, applications of on‐line ICP‐MS techniques in studies embracing dissolution of catalysts for oxygen reduction (ORR) and evolution (OER) as well as hydrogen oxidation (HOR) and evolution (HER) reactions are reviewed.     

培养应用型人才下的高分子化学实验教学改革探讨

高分子实验教学是培养高分子应用型人才重要的实践教学环节。针对应用型人才的培养,根据该校的实验情况,对高分子化学实验教学的改革进行了初步探讨。     

构建助力学生全方位成长的化学实验课程助教体系

Based on decades of experiences on involving teaching assistants for laboratory teaching, College of Chemistry and Molecular Engineering at Peking University developed a complete set of teaching assistant management regulations and guidelines, including recruitment, lab-teaching training, supervising, and performance assessment of teaching assistants, to effectively improve laboratory teaching and to provide a platform which is beneficial to multi-dimensional development as well as future career of undergraduates.     

模块化物理实验教学的方式与策略

结合教学实践,探讨模块化物理实验教学的方式与策略.首先考虑将物理实验项目模块化处理,分阶段依次设置基础性实验模块、综合提高性实验模块和设计研究性实验模块.针对不同阶段的课程模块,应用启发式教学逐步提高学生分析问题和解决问题的能力,培养学生的创新能力.     

Fast Electroenzymatic Measurement of Total Cholesterol in Serum

Abstract

An electrochemical method for a rapid assay of total cholesterol in serum using free cholesterol oxidase (EC 1.1.3.6) and cholesterol esterase (EC 3.1.1.13) is described. Hydrogen peroxide generated by cholesterol oxidase is amperometrically monitored at + 650 mV vs Ag/AgCl and two types of responses can be recorded : a steady-state response and a dynamic one. The dynamic response is obtained within one minute. Interfering species are detected prior measurement and a linear calibration curve can be obtained for total cholesterol in the sample in the range 0.4-8 mM useful for clinical analysis.     

“互联网+”背景下大学化学实验的在线辅助教学模式创新及成效探索

Original teaching schedules were suspended in response to COVID-19 epidemic. The Chemical Experiment Teaching Center of University of Science and Technology of China adjusted the teaching plan in time, and carried out online assisted teaching based on "one lesson one policy" teaching scheme. The preliminary effect of using MOOC and virtual simulation experiments, which had already been built in the early stage, were discussed in this paper.     

计算机辅助物理实验教学的讨论

本文介绍了计算机网络全面辅助开放式教学模式     

Study of the Interaction Between Peroxynitrite and Hemoglobin

Abstract

Peroxynitrite (ONOO^?), which is usually generated as a response of the immune system or in inflammatory processes, is a powerful oxidant species, while hemoglobin is an important peroxynitrite scavenger in vivo. In this work, we have studied the interaction between peroxynitrite and hemoglobin through an electrochemical method and UV-Vis spectroscopy. It is found that peroxynitrite, at a relatively high concentration level, may make the protein exhibit a concentration-dependent increase of its catalytic activity towards hydrogen peroxide, whereas peroxynitrite at low concentration will result in the slight decrease of the catalytic activity. Further studies reveal that the diversification of the enzymatic activity is ascribed to the different extent of tyrosine nitration and, accordingly, the spatial conformation of the protein.