Progress in Chemistry

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Wavelet Transform and Signal Processing in Analytical Chemistry

Shao Xueguang,Pang Chunyan,Sun Li

Progress in Chemistry. 2000, 12(03): 233.

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Shao Xueguang,Pang Chunyan,Sun Li. Wavelet Transform and Signal Processing in Analytical Chemistry[J]. Progress in Chemistry, 2000, 12(03): 233-.

Basic theories, algorithms and applications of wavelet transform (WT)were described in this paper. The main characteristic of the WT is the dual localization property in both time domain and frequency domain, which enables WT to be a high performance signal processing technique. WT has been applied todenoising, data compression, and resolution of overlapping signals in analytical chemistry that includes flow injection analysis ( FIA ) , voltammetric analysis, high performance liquid chromatography (HPLC) , infrared ( IR ) spectroscopy, mass spectroscopy (M S) , nuclear magnetic resonance (NMR ) spectroscopy, ultraviolet visible (UV-Vis ) spectroscopy, photoacoustic spectroscopy (PAS) , extended Xray absorption fine structure (EXAFS) spectrum , etc.
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Research on Size-Selected Supported Metal Cluster Study

Peng Bixian,Zhao Xiang

Progress in Chemistry. 2000, 12(03): 245.

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Peng Bixian,Zhao Xiang. Research on Size-Selected Supported Metal Cluster Study[J]. Progress in Chemistry, 2000, 12(03): 245-.

The research on metal clusters was reviewed in the aspects of the generation, deposition, migration on the surface of support and the reactivity of the size selected supported metal clusters. The trend of research on this field was indicated.
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Thermodynamics and Phase Equilibria of the Salt Lake Brine System at 25 ℃

Song Peng sheng,Yao Yan,Li Jun

Progress in Chemistry. 2000, 12(03): 255.

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Song Peng sheng,Yao Yan,Li Jun. Thermodynamics and Phase Equilibria of the Salt Lake Brine System at 25 ℃[J]. Progress in Chemistry, 2000, 12(03): 255-.

The salt lakes on the Qinghai-Xizang Plateau of China are famous for their high concentration of boron and lithium in brines. These brines mostly belong to the system Li⁺、Na⁺、K⁺、Mg²⁺(Ca²⁺)/Cl^-，CO^2-₃(HCO^-₃)、SO^2-₄，borate-H₂O (so called "Salt Lake Brine System") which is disserent from the classic sea water system and others. The phase diagram and solution properties of the salt lake brine system are obviously important for comprehensive utilization of brines and for investigation of the formation and evolution of Li, B-bearing salt lakes. Thermodynamics and phase equilibrium of the system are described with Pitzer ion interactio model of electrolyte solution. The prediction of phase equilibrium of the system Li⁺, K⁺, Mg²⁺/Cl^-,SO^2-₄-H₂O at 25^。C is taken as an example to illustrate applicability and reliability of the model.
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Recent Advances in the Synthesis of Liquid Hydrocarbon via Fischer-Tropsch Synthesis

Dai Xiaoping,Yu Changchun,Shen Shikong^*

Progress in Chemistry. 2000, 12(03): 268.

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Dai Xiaoping,Yu Changchun,Shen Shikong^*. Recent Advances in the Synthesis of Liquid Hydrocarbon via Fischer-Tropsch Synthesis[J]. Progress in Chemistry, 2000, 12(03): 268-.

Conversion of natural gas to liquid hydrocarbon (GTL ) via Fischer Tropsch synthesis (FTS) is one of the main trends in the use of natural gas. Some corporations, such as Shell, Sasol, Exxon and Syntroleum , have developed their patent techniques of GTL , respectively. The products from GTL include fuel oil, base oil for lubricant, and other chemicals, which are environmentally friendly due to its lower S, N,metal content and aromatic hydrocarbon. With the developing in syngas manufactu re, catalyst preparation and process design of FTS, GTL compete with the product ion route from crude oil in economy in remote, small ormedium sized gas field. The recent advances in catalysts and processesare reviewed, and the trend of GTL in the future is discussed.It's of great importance to develop the technique in China.
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Review of Asymmetric Cyclopropanat ion of Olefins

Yao Xiaoquan,Chen Huilin,Zheng Zhuo^*

Progress in Chemistry. 2000, 12(03): 282.

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Yao Xiaoquan,Chen Huilin,Zheng Zhuo^*. Review of Asymmetric Cyclopropanat ion of Olefins[J]. Progress in Chemistry, 2000, 12(03): 282-.

In this article, the progress on asymmetric cyclopropanation of olefins during the last decade was reviewed. The application of chiral C₂-symmetrical ligands in the reaction, such as bis2oxazoline and semicorrin, were discussed in detail. The new development of research on mechanism was in troduced. Some major difficulties in the industrial application of the reaction were summarized.
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Effect of Organic Solvents on Enzymaticm Activity and Selectivity

Peng Lifeng

Progress in Chemistry. 2000, 12(03): 296.

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Peng Lifeng. Effect of Organic Solvents on Enzymaticm Activity and Selectivity[J]. Progress in Chemistry, 2000, 12(03): 296-.

The structure and function of an enzyme in organic solvents are different from that in water. The enzymatic activity and selectivity in organic solvents can be improved by regulating strategies. The effects of solvents on the enzymatic activity and selectivity are mainly discussed and the thermodynamic model of predicting enzymatic selectivity is introduced.
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Synthesis of Chiral Phosphine Ligands and Their Applications in Asymmetric Catalysis

Li Yanyun,Xia Chungu^**,Xie Baohan

Progress in Chemistry. 2000, 12(03): 305.

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Li Yanyun,Xia Chungu^**,Xie Baohan. Synthesis of Chiral Phosphine Ligands and Their Applications in Asymmetric Catalysis[J]. Progress in Chemistry, 2000, 12(03): 305-.

The progress in synthesis of chiral phosphine ligands is reviewed. Their applications in asymmetric hydrogenation, asymmetric hydroformylation and asymmetric hydroesterification are described.
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Polymer Effects of Cyclodextr in Polymer

Wang Yongjian,Zhang Zhengpu,He Binglin

Progress in Chemistry. 2000, 12(03): 318.

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Wang Yongjian,Zhang Zhengpu,He Binglin. Polymer Effects of Cyclodextr in Polymer[J]. Progress in Chemistry, 2000, 12(03): 318-.

One of the most important properties of cyclodextrin is the ability to form inclusion complexes with numerous molecules that they take up in their central hydrophobic cavities. They are widely used in the fields of chrom atographic separation,selective catalysis, food, pharmaceutics and pesticides industries. Cyclodextrin polymers(CDP) are verified to have the abilities of inclusion, control release and catalysis and have good mechanical and chemical stability. They are now applied to the areas of chromatography, air purifying, and food industry. The polymer effects of cyclodextrin polymer , mainly including cooperation and neighboring effects are reviewed.
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Research on Olefin Oligomerization and Cyclization Catalyzed by Metallocene Catalyst

Shen Yumei,He Ren

Progress in Chemistry. 2000, 12(03): 325.

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Shen Yumei,He Ren. Research on Olefin Oligomerization and Cyclization Catalyzed by Metallocene Catalyst[J]. Progress in Chemistry, 2000, 12(03): 325-.

The recent advances in olefins oligomerization catalyzed by metallocene catalyst have been reviewed. Emphasisis given to the catalytic reactions, cyclization and prospect of application of metallocene catalyst.
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Peptidomimetics in Drug Design

Zhou Jiaju,Lei Jing,Xie Guirong,Li Renli

Progress in Chemistry. 2000, 12(03): 332.

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Zhou Jiaju,Lei Jing,Xie Guirong,Li Renli. Peptidomimetics in Drug Design[J]. Progress in Chemistry, 2000, 12(03): 332-.

The peptidomimetics in drug design has been reviewed in the paper.
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Progress in Infrared Spectroscopic Analysis of Tumor Cells and Tissues

Gao Tiyu,Ci Yunxiang^**,Li Jun

Progress in Chemistry. 2000, 12(03): 346.

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Gao Tiyu,Ci Yunxiang^**,Li Jun. Progress in Infrared Spectroscopic Analysis of Tumor Cells and Tissues[J]. Progress in Chemistry, 2000, 12(03): 346-.

A review with 58 references is presented on the Fourier infrared spectroscopy applied to biological cells and tissues. The assignments of the major infrared absorption bands of cells are introduced. The spectro scopic features and the analytical methods of tumor are mainly reviewed. The implications of infrared spectro scopy applied to the diagnosis of cancer are also discussed.
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Progess in the Research of Endogenous Biological Active Substances for the Target by Nucleic Acids

Du Canping, Tang Jin

Progress in Chemistry. 2000, 12(03): 354.

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Du Canping, Tang Jin. Progess in the Research of Endogenous Biological Active Substances for the Target by Nucleic Acids[J]. Progress in Chemistry, 2000, 12(03): 354-.
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Chemical Biology: A Cross-D iscipline in the 21st Century

Du Canping,Tang Jin,Zhang Lihe

Progress in Chemistry. 2000, 12(03): 355.

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Du Canping,Tang Jin,Zhang Lihe. Chemical Biology: A Cross-D iscipline in the 21st Century[J]. Progress in Chemistry, 2000, 12(03): 355-.
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State of the Art of Advanced Ceramic Materials

Wang Benmin

Progress in Chemistry. 2000, 12(03): 357.

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Wang Benmin. State of the Art of Advanced Ceramic Materials[J]. Progress in Chemistry, 2000, 12(03): 357-.

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