Potentiodynamic deposition of Prussian blue from a solution containing single component of ferricyanide and its mechanism investigation

Potentiodynamic techniques were used for the direct electrodeposition of Prussian blue nano-clusters from an acidic solution of ferricyanide. Electrochemical, EQCM, IR, AFM, and UV/vis measurements were carried out to characterize deposited nano-sized Prussian blue and to explore the formation mechanism. Results showed that ferricyanide could partially dissociate to free ferric and cyanide ions. The driving force of this dissociation is the formation of PB and the evolution of HCN. The optimal potential window for the potentiodynamic formation of PB from an acidic solution (pH 1.6) is between –0.5 V and 0.4 V. In addition, the influence of surface adsorption of CN^- ions on the formation of PB was discussed.Dedicated to Professor W. Vielstich on the occasion of his 80th birthday.     

茶叶中三氯螨杀醇残留量的快速HPLC测定法

用微量化技术处理茶叶样品，样品经石油醚提取、浓硫酸磺化后，用反相液相色谱分离、测定样品处理液中的三氯杀螨醇残留量，２３４ｎｍ检测，外标法定量。测定低限为０．５ｍｇ／ｋｇ，回收率为９１．５％～９９．３％，变异系数为１．５３％～６．９２％之间。     

一种制备大量氧化锌纳米管的简单方法(英)

ZnO nanotubes were synthesized in large scale by thermal decomposition of the precursors obtained via chemical reaction between Zn(CH₃COO)₂·2H₂O and NaHCO₃ in the presence of surfactant sodium dodecyl sulfate (SDS). The inner diameters of the tubes were in the range of 80～100 nm, and outer diameters in the range of 160～260 nm with lengths up to a few micrometers. The products were characterized with XRD, TEM, and SEM.     

甲氧羰基亚甲基三苯基胂与邻羟基芳醛,酮的反应-5,6-苯并-2-吡喃酮的合成

本文报道一种合成烃基取代5,6-苯并-2-吡喃酮的方法。甲氧羰基亚甲基三苯基胂与烃基取代的邻羟基芳醛、酮反应,首先生成α,β-不饱和酸酯,继而发生分子内环化,生成烃基取代的5,6-苯并-2-吡喃酮。     

In vivo optical analysis of quantitative changes in collagen and elastin during arterial remodeling

Altered collagen and elastin content correlates closely with remodeling of the arterial wall after injury. Optical analytical approaches have been shown to detect qualitative changes in plaque composition, but the capacity for detection of quantitative changes in arterial collagen and elastin content in vivo is not known. We have assessed fluorescence spectroscopy for detection of quantitative changes in arterial composition in situ, in rabbit models of angioplasty and stent implant. Fluorescence emission intensity (FEI) recorded at sites remote from the primary implant site was correlated with immunohistochemical (IH) analysis and extracted elastin and collagen. FEI was significantly decreased (P<0.05) after treatment with anti-inflammatory agents, and plaque area decreased on comparison with saline-treated rabbits after stent implant or angioplasty (Por=0.961) analysis were detected by multiple regression (MR) analysis. Good correlations also were found for FEI with elastin and collagen measured by high-performance liquid chromatography; MR analysis provided highly predictive values for collagen and elastin (R2>or=0.994). Fluorescence spectroscopic analysis detects quantitative compositional changes in arterial connective tissue in vivo, demonstrating changes at sites remote from primary angioplasty and stent implant sites.     

Cu-catalyzed hydroxycyclopropanol ring-opening cyclization to tetrahydrofurans and tetrahydropyrans: short total syntheses of hyperiones

Tetrahydrofurans (THFs) and tetrahydropyrans (THPs) are important core scaffolds frequently found in many molecules of medicinal importance. Herein, we report a novel copper-catalyzed hydroxycyclopropanol ring-opening cyclization methodology to synthesize di- or tri-substituted THFs and THPs. In this reaction, a strained C–C bond was cleaved and a new Csp³–O bond was formed to produce the aforementioned O-heterocycles. The new THF synthesis features a broad substrate scope, scalability, and good functional-group tolerability. It enabled us to complete the shortest enantioselective syntheses of hyperiones A and B (3 and 4 steps, respectively), which is significantly shorter than the previously reported two total syntheses (≥10 steps).

A novel Cu-catalyzed hydroxycyclopropanol ring-opening cyclization was developed to synthesize substituted tetrahydrofuran/tetrahydropyran molecules including two norlignan natural products hyperiones A and B.     

蒙旦树脂化学组成的研究

采用阴离子交换色谱和硅胶－氧化铝柱色谱对云南寻甸蒙旦树脂（ＸＤＳＺ）、潦浒蒙旦树脂（ＬＨＳＺ）、昭通蒙旦树脂（ＺＴＳＺ）和吉林舒兰蒙旦树脂（ＳＬＳＺ）进行了族组分的分离。树脂游离酸，树脂结合酸，树脂烃和树脂醇在各树脂中的百分含量分别为ＸＤＳＺ１１．８６，８．７６，１２．３０，４５．９９；ＬＨＳＺ１５．８９，１３．９１，４．９０，４５．９９；ＳＬＳＺ２５．４６，８．０７，１７．４０，３６．２２；ＺＴ     

庐山儿童发中微量元素与生长发育关系的调查

调查分析了庐山５０８名１－７岁儿童发中锌，铁，铜含量，并对其与儿童生长发育的关系进行了探讨。结果表明，微量元素与生长发育密切相关。     

2,6-二乙酰吡啶类双希夫碱配合物的合成和研究 Ⅱ.Cu(Ⅱ)配合物的合成和研究

合成了五个2,6-二乙酰吡啶缩肼基硫代甲酸酯双希夫碱合铜(Ⅱ)配合物,用元素分析、磁化率、红外光谱及紫外-可见光谱等对它们进行了表征,研究了配合物的电化学性质和Cu₃L₂²X₂(X=Cl^-、SCN^-)的光电子能谱。结果表明:五个Cu(Ⅱ)配合物均为三核配合物,在Cu₃L₂²(SCN)₂中存在Cu(Ⅱ)间的自旋-交换作用。     

含CexZr1-xO2三效催化剂设计的神经网络仿真与优化

提出一种含CexZr1-xO2的三效催化剂的设计方法,即利用人工神经网络来进行辅助设计.首先考察了影响三效催化剂性能的一些重要因素,确定了所研究的三效催化剂模型.然后采用共沉淀方法制备了一系列铈锆固溶体,并将它们作为三效催化剂的助催化剂.采用传统的催化剂制备方法制备了一系列负载贵金属的三效催化剂,所制备的催化剂在模拟尾气中进行评价,得到的数据作为神经网络的训练样本和测试样本,建立了神经网络模型,并初步进行了预测和优化.