关于复函数高阶微分"中值点"的渐近性

给出了复函数的高阶微分中值公式,并利用Stirling数这个工具获得了该公式"中值点"的渐近性.     

一种具有Keggin结构的有机-无机复合的单铈取代夹心型磷钨酸盐的合成及其结构表征(英文)

在水热条件下合成了一种具有Keggin结构的有机-无机复合的单铈取代夹心型磷钨酸盐[H2dap]2.5H5-[Ce(α-PW11O39)2].11.5H2O(1);利用元素分析、红外光谱和单晶X射线衍射表征了其结构.结果表明,化合物1属于三斜晶系,P-1空间群,晶胞参数为:a=1.254 9(7)nm,b=1.915 9(11)nm,c=2.129 0(12)nm,α=68.426(10)°,β=88.320(10)°,γ=89.853(10)°,V=4.758(5)nm3,Z=2,Dc=4.116g/cm3,GOOF=1.022,R1=0.111 2,wR2=0.218 9.化合物1分子由1个晶体学独立单铈取代夹心型[Ce(α-PW11-O39)2]10-磷钨酸多阴离子,2.5个双质子化的[H2dap]2+阳离子,5个质子及11.5个结晶水分子组成.     

大豆渣中异黄酮的提取及抑菌活性

研究大豆豆渣中异黄酮提取的工艺条件及其抑菌活性。在单因素试验和L25(54)正交试验的基础上,确定正己烷料液比1∶8(g/mL)、乙醇混合提取大豆异黄酮的最佳工艺条件:乙醇浓度70%、料液比(g/mL)1∶12、提取温度65℃和提取时间2.5h。对大豆异黄酮的抑菌活性进行了研究,结果表明:大豆异黄酮对金黄色葡萄球菌、枯草芽孢杆菌、短小芽孢杆菌和红曲霉的生长均有明显的抑制作用,抑菌作用符合三次回归方程,对大肠杆菌和短乳杆菌没有显著影响。     

X-ray microprobe synchroton radiation X-ray fluorescence application on human teeth of renal insufficiency patients

This work reports on the measurements of elemental profiles in teeth collected from patients with renal insufficiency. Elemental concentrations of Ti, Mn, Fe, Co, Ni, Cu, Zn, Se, Br, Rb Sr and Pb in different parts of teeth from patients with renal insufficiency are discussed and correlated with the corresponding values for healthy citizens. Both situations, patients with and without dialysis treatment were studied. The purpose of this work is to point out the influence of renal insufficiency together with long dialysis treatment, on teeth elemental content. An X-ray fluorescence set-up with microprobe capabilities, installed at the LURE synchrotron (France) was used for elemental determination. The resolution of the synchrotron microprobe was 100 μm and the energy of the incident photons was 19 keV. Teeth of citizens with renal insufficiency and those submitted since several years to dialysis treatment show a similar concentration with teeth of healthy subjects in what concerns the elemental distribution for Mn, Fe, Cu, Zn and Sr. However, higher levels of Pb were found in pulp region of diseased citizens when compared to values of healthy people. Very low concentrations of Ti, Co, Ni, Se, Br and Rb were found in all the analysed teeth. No difference was found in patients with and without dialysis treatment.     

微晶酚酞预富集-分光光度法测定痕量Co(Ⅱ)

建立了一种以微晶酚酞作为固态吸附剂对样品中痕量的Co（Ⅱ）分离富集的新方法,富集后的co（Ⅱ）可直接用光度法测定。控制一定条件,Co（Ⅱ）能与常见阳离子Ni（Ⅱ）、Cd（Ⅱ）、Al（Ⅲ）、Ca（Ⅱ）、Mg（Ⅱ）、Pb（Ⅱ）、Mn（Ⅱ）、Fe（Ⅲ）、Bi（Ⅲ）等完全分离,且富集时基本不受SO4^2-、NO3^-、Br^-、Cl^-、I^-等阴离子影响。微晶酚酞对Co（Ⅱ）的吸附容量为23．5mg／g;富集因数可达200倍,回收率在97．6％以上,RSD为1．1％～2．3％。已用于环境水样及日常用水中Co（Ⅱ）的富集测定。     

N-[5-(对三氟甲基苯基)-1,3,4-噻二唑-2-基]-N′-芳氧乙酰基硫脲的合成与生物活性

2-氨基-5-(对三氟甲基苯基)-1,3,4-噻二唑与芳氧乙酰基异硫氰酸酯反应,合成了10种新的芳氧乙酰基硫脲。其结构经1H NMR,IR和元素分析确证。初步的生物活性实验结果表明,部分化合物具有较好的植物生长调节活性。     

N-(2-羧基-1,3,4-噻二唑-5-基)-N'-芳酰基硫脲与芳氧乙酰基硫脲的合成与生物活性

为了寻找高活性的杂环农药, 用5-氨基-1,3,4-噻二唑-2-羧酸与芳酰基异硫氰酸酯及芳氧乙酰基异硫氰酸酯反应, 合成出18种新的芳酰基硫脲与芳氧乙酰基硫脲, 采用红外光谱、核磁共振氢谱和元素分析证明了其结构, 初步的生物活性测定试验表明, 部分目标化合物具有良好的植物生长调节活性, 其中2c, 2d, 3b和3g具有良好的生长素活性.     

TD-DFT Study on Pyrazoline Derivatives

1 INTRODUCTION Pyrazoline compounds have been widely used in industry due to their good photoconductivity and high fluorescence quantum productivity[1]. In recent years, pyrazoline derivatives with high vitrification temperature Tg have been found to act as hole trans- fer materials in the electroluminescence device, which has captured the intensive interest of che- mists[2]. But so far, the electron transfer mechanism of these compounds is still unclear[3~7]. Some resear- ches have attr…     

不同供氢底物用于测定H2O2的酶催化动力学研究

研究了牛血红蛋白(hemoglobin,Hb)作为过氧化物模拟酶,以酸性铬蓝K、罗丹明B、亚甲基蓝不同供氢底物测定H2O2的酶催化反应体系的催化特性和反应条件。探讨了采用不同底物测定时的催化反应机理。用于雨水中H2O2含量的测定,结果满意。