Direct Electrochemistry of Catalase on Single Wall Carbon Nanotubes Modified Glassy Carbon Electrode

Direct electrochemistry of catalase (Ct) has been studied on single wall carbon nanotubes (SWNTs) modified glassy carbon (GC) electrode. A pair of well-defined nearly reversible redox peaks is given at -0.48 V (vs. SCE) in 0.1 mol/L phosphate solution (pH 7.0).The peak current in cyclic voltammogram is proportional to the scan rate. The peak potential of catalase is shifted to more negative value when the pH increases. Catalase can adsorb on the SWNTs modified electrode.     

Real-time Event Recognition and Analysis System for Nanopore Study

To achieve fast and accurate analysis of weak current signal of nanopore-based single molecule detection, an online data process based on adaptive threshold algorithm with data buffering technique and finite impulse response filtering was designed. A software system based on the data process was developed for online recognition and analysis of nanopore events during nanopore experiment. To testify the performance of the algorithm and software system, ideal signals with different noise level (20–100 pA) were generated at bandwidth ranging from 3 kHz to 100 kHz. The result showed that this software system was stable at different bandwidths and sampling rates and could be used in analyzing the signals at high noise. The proposed software system was further applied to aerolysin nanopore experiment for detection of poly(dA)₄ molecules. The results showed that the data process system could be applied in real nanopore recording experiment with high accuracy and speed.     

UHPLC-ESI-MS/MS法测定动物源食物提取物中肌肽与鹅肌肽的含量

建立了一种同时测定动物源提取物中肌肽(Carnosine)和鹅肌肽(Anserine)含量的超高效液相色谱-电喷雾串联三重四极杆质谱(UHPLC-ESI-MS/MS)分析方法。采用超高效液相分离系统,借助Inertsil Amide HP色谱柱(2. 1 mm×100 mm,3μm)以0. 1%乙酸水溶液-乙腈为流动相,梯度洗脱分离,利用峰面积外标法定量。经过优化,肌肽和鹅肌肽在1. 95～500μg/L质量浓度范围内与峰面积呈良好的线性关系,相关系数(r)均大于0. 998。肌肽和鹅肌肽的检出限分别为0. 12、0. 47μg/L。以低浓度低聚肽原料为基质,在低、中、高3个加标浓度下,肌肽的回收率为99. 3%～109%,相对标准偏差(RSD,n=6)为0. 98%～1. 1%;鹅肌肽的回收率为100%～113%,RSD为1. 0%～1. 1%。该法前处理简单、快速,重现性好,准确度高,适用于动物源食物提取物中肌肽和鹅肌肽的同时快速检测。     

Theoretical Studies on CH_3SiH_3 H→CH_3SiH_2 H_2 Reaction with the Variational Transitional State Theory

IntroductionThe abstraction reaction between CH,SiH, and H plays an important role in siliconcontaining species and has been the subject of many experimental studies'-', but it hasnot been studied with the variational transition state theory. In this paper, the dynamics ofthe title reaction is investigated by using POLYRATE7.8 program obtained from Truhlar'.The theoretical rate constants for the title reaction are obtained over a wide range oftemperature 298- 1 700 K.Theory and Methods'…     

Tc—λ曲线

本文指出了,T_c-λ曲线是由性质完全不同的“McMillan区域”、“λ^1.55区域”和“级数解”三个部分组成的。 关键词：     

金属硅化物纳米材料的化学合成

金属硅化物具有很高的熔点、较低的电阻率、很好的化学稳定性和热稳定性等性能，因此得到了广泛的重视。本课题组最近发展了熔盐（无机溶剂）法、四氯化硅溶剂热法、以氟硅酸钠为硅源的共还原法制备金属硅化物纳米材料等方法。本文就金属硅化物纳米材料化学合成的方法进行了综述。     

概率论与数理统计实验教学案例设计

为克服传统数学教学模式局限于理论教学的弊端而倡导实践教学,设计出一个概率论与数理统计实验教学的案例,将线性回归分析应用于高光谱遥感图像的处理之中.     

YAG:Ce荧光粉体的柠檬酸盐分解法制备和表征

通过对柠檬酸盐分解法的改进,在800℃的低温下合成了YAG:Ce立方晶荧光粉体,用X-射线衍射法研究了YAG的成相过程.结果表明:Y2O3与Al2O3的摩尔比为33∶5时更易形成YAG相,成相过程是由无定型态直接转变为YAG相的.同时考察了样品的发光性质.     

Synthesis, Crystal Structure and Thermal Property of a Manganese(II) 4-Carboxyphenoxyacetate Complex

1 INTRODUCTION Organic aromatic carboxylic acids which com-monly possess multiple coordination modes are ex-cellent candidates for constructing supramolecularmetal complexes[1～6]. 4-Carboxyphenoxyacetic acid(4-CPOAH2), widely used in biological activitystudies, is a multidentate flexible ligand that not onlyhas versatile binding possibilities but also can formregular hydrogen bonds as both hydrogen-bond donorand acceptor. However, there have been few reportson the coordination chemistr…     

透明SiO2-Al2O3-CaO-CaF2 微晶玻璃中Tb3+的发光性能研究

通过对1.0 mol;Tb2O3掺杂45SiO2-20Al2O3-10CaO-25CaF2玻璃进行热处理制备出透明微晶玻璃,经XRD分析微晶玻璃内析出了大小约为27 nm 的CaF2颗粒.并分别在紫外和X射线激发下研究了Tb3+在基质玻璃和透明微晶玻璃中的发光行为.结果表明:微晶玻璃中CaF2纳米晶颗粒的析出有利于提高Tb3+的发光性能,紫外激发时,Tb3+的545 nm特征发光强度增强了4倍;而X射线激发时,Tb3+的545 nm特征发光强度增加了3.5倍.