P改性HZSM－5分子筛上C4烯烃裂解性能研究 Catalytic Cracking of C4 Olefins over P－Modified HZSM－5 Zeolite

Propylene is one of the most important basic organic products. The traditional method for producing propylene cannot satisfy the faster-growing demand for it. The new methods to produce propylene include the catalytic cracking of olefin-rich hydrocarbon feedstocks[1～3], which has higher selectivity.     

离子选择性中性载体液膜光极的响应性能与液膜厚度

用钙离子光极探讨了中性载液膜光极液膜厚与其各主要响应性能的关系。结果表明光极的浓度线性响应范围与膜厚无关。     

NaIO4-H2O2 流动注射化学发光法测定天然水中硒的研究

建立了一种简易、快速检测天然水中痕量硒的流动注射化学发光法。该法基于NaIO4-H2O2(pH 7.0)氧化Se(0)生成Se(Ⅳ)所产生O*的化学发光,发光强度与一定浓度范围内的Se呈线性关系,加入环己烷和Triton-100能增强这一体系的发光强度。该法测定Se的线性范围为1.0×10-7~1.0×10-5mol.L-1,检测限为4.2×10-8mol.L-1,对4.0×10-7mol.L-1的Se进行测定的RSD为3.5%(n=8)。用该法对天然水体中Se进行了测定,结果满意。     

SORPTION OF PHENOL AND P-NITROPHENOL ONTO A WEAKLY ANION EXCHANGER: XPS ANALYSIS AND MECHANISM

1. INTRODUCTION Phenolic compounds are pollutants encountered frequently in water system. Some of them, such as phenol and p-nitrophenol, have been listed as priority pollutants in many countries. How to remove them completely from the polluted water is of significant concern to environmental scientists. Up to now many technologies such as biodegradation, oxidation and adsorption are available to remove phenolic compounds from the receiving water [1~4]. In the past two decadesphenol sorpt…     

乙醛存在下氨基糖苷类抗生素的吸附伏安法研究

用悬汞电极，于Ｂｒｉｔｔｏｎ－Ｒｏｂｉｎｓｏｎ－ＣＨ３ＣＨＯ（ｐＨ９．５～１０．５）体系中研究了妥布霉素、丁胺卡那霉素等五种氨基糖苷类抗生素的吸附伏安行为，并讨论了其电极过程。认为该类抗生素结构上共有的伯、仲氨基与乙醛的衍生化反应产物，在一定电位下易吸附于电极表面。其不可逆还原峰的峰电位为－１．４５Ｖ（ｖｓ．ＳＣＥ）。在选定条件下，浓度在２．０×１０（－９）～２．５×１０（－７）ｇ／ｍＬ范围内均与还原峰峰电流呈良好的线性关系，检测限低至１．０×１０（－９）ｇ／ｍＬ。方法无需预处理即可用于软膏、尿样的测定，回收率在９０．３％～１１４％之间。     

希土与α—α''''—联吡啶、三氯醋酸或三氟醋酸混配配合物的合成及性质研究

本文讨论了十四个镧系离子(除Pm以外)与α-α＇-联吡啶及三氯醋酸形成配合物的合成方法,并用类似的合成方法得到9个希土离子与α-α＇-联吡啶及三氟醋酸的混配配合物。通过元素分析,红外、紫外、差热和热重等分析测试手段,确定了两类配合物的组成分别为Ln(CCl_3COO)_3dipy·nH_2O(n=1-2)和Ln(CF_3COO)_3dipy,并讨论了它们的性质。     

仿生超疏水性表面的研究进展*

仿生超疏水性表面的研究是化学模拟生物体系研究中的一个新领域。荷叶等植物叶面的超疏水现象为我们在不同基底上制备仿生超疏水性表面提供了实践基础。本文给出荷叶等三种植物叶面的超疏水性和微观结构，阐述了仿生超疏水性表面的研究进展。     

新型2-取代嘧啶酮-5-甲酰苄胺的合成及抗肿瘤生物活性试验

以丙二酸单甲酯单甲酰氯、苄胺为起始原料,经与DMF-DMA反应后形成的关键中间体分别与胍或脒缩合关环,合成了2-取代嘧啶酮-5-甲酰苄胺化合物6和7。产物经1HNMR、13CNMR、MS、HRMS进行了结构表征。初步的生物活性试验显示化合物6和7具有抗肿瘤活性。     

A Novel Lu Index to QSPR Studies of Aldehydes and Ketones

A novel index based on the hyper-Wiener index, named Lu, was proposed. The relative bond length between two adjacent vertices in a molecular graph was taken into account in the definition of the Lu index. The usefulness of the new index in QSPR study was verified by its correlation with a number of organic compounds including aliphatic aldehydes and ketones. For each of the physical properties (the normal boiling points, molar refractions and gas heat capacities at 25°C), high quality QSPR models were obtained. The final models were validated to be statistically reliable using the leave-one-out cross validation and/or an external test set. The correlation coefficients (> 0.99) of all constructed models indicate the necessity of such an index, and show the potential of the Lu index for QSAR/QSPR studies.     

Investigation of the influence on conformational transition of DNA induced by cationic lipid vesicles

Recent studies have focused on the structural features of DNA-lipid assemblies. In this paper we take nile blue A (NBA) as a probe molecule to study the influence of the conformational transition of DNA induced by didodecyldimethylammonium bromide (DDAB) cationic vesicles to the interaction between DNA and the probe molecules. We find that upon binding to DNA, a secondary conformational transition of DNA induced by the cationic liposome from the native B-form to the C-form resulted in the change of binding modes of NBA to DNA and different complexes are formed between DNA, DDAB and NBA.