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HPLC of Amino Acids and Oligopeptides by Pre-Column Fluorescence Derivatization with 9-Acridine Formyl Chloride

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chinese chemical Letters 1997年第10期8卷 875-878页

作者： Jin Mao YOU Xin Jun FAN Qing Yu OU(lanzhou Institute of chemical {2.. chinese academy of sciences 730000) chinese ACAD SCI LANZHOU INST CHEM PHYSLANZHOU 730000PEOPLES R CHINA

A highly sensitive HPLC method for the detection of amino acids and oligopeptides with 9-acridine formyl chloride by pre-column fluorescence derivatization has been developed. Glycine, glycylglycine, histidine, triglycine and glutathione were separated on a reversed-phase C-18 column with methanol-water-triethylamine eluent, derivatization and chromatographic conditions were optimized. The five derivatives were eluted in 2. min with a good reproducibility. Linear range of the calibration graph was 0.08-2.0 nmol/ml(-1). The relative standard deviations(n=6) are 2.-40 fmol.

关键词： HPLC of Amino Acids and Oligopeptides by Pre-Column Fluorescence Derivatization with 9-Acridine Formyl Chloride

Catalytic Activity and Stability of Mo_2. in CO Oxidation

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chinese chemical Letters 1998年第6期9卷 579-581页

作者： Guo Huang XIE Zhi Cheng JIANG Ting Fang BAI Han Qing WANG(lanzhou Institute of chemical {2., chinese academy of sciences,lanzhou 730000) chinese Acad Sci Lanzhou Inst Chem Phys Lanzhou 730000 Peoples R China

Molybdenum nitride powder with 115 m^2.^(-1) of Sg has been prepared by atemperature programmed reaction of MoO_3 in H_2.N_2.mixture. It exhibited high catalyticactivity in CO oxidation at low temperatures. DTA in airflow showed that the crystalphase of Mo_2. was maintained under 500℃. The suitable operation temperature isbelow 500℃ in CO oxidation.

关键词： Mo_2. CO oxidation stability

EPR Study on Mixed Valence States of Mo Ions in Molybdenum Nitride

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分子催化 1998年第3期 4-5页

作者： XIE Guohuang JIANG Zhicheng AN Lidun BAI Tingfang WANG Hanqing2.(lanzhou Institute of chemical {2. The chinese academy of sciences lanzhou 730000)

ＥＰＲＳｔｕｄｙｏｎＭｉｘｅｄＶａｌｅｎｃｅＳｔａｔｅｓｏｆＭｏＩｏｎｓｉｎＭｏｌｙｂｄｅｎｕｍＮｉｔｒｉｄｅ１）ＸＩＥＧｕｏｈｕａｎｇＪＩＡＮＧＺｈｉｃｈｅｎｇＡＮＬｉｄｕｎＢＡＩＴｉｎｇｆａｎｇＷＡＮＧＨａｎｑｉ... 详细信息

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关键词： EPR Molybdenum nitride Passivation

AN　ESR　STUDY　OF　MgO　TREATED　WITH　SHOCK　WAVE

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chinese chemical Letters 1996年第5期7卷 487-490页

作者： Ting Lu YANG Kang XU Liang Bo FENG and Shi Kong SHEN (lanzhou Institute of chemical {2., chinese academy of sciences. lanzhou 730000) chinese ACAD SCI LANZHOU INST CHEM PHYSLANZHOU 730000PEOPLES R CHINA

Abstract:A MgO sample treated with shock wave was studied by using electron spin resonance(ESR) spectroscopy. An isotropic ESR singal at g=2.002.could be designated to F centers. O2.superoxide ions penetrated into the surface layer of NgO powder after shocking were identified at gxx=2.006, gyy=2.009,and gzz=2.***.2.02.. The change of surface adsorption ability for O2.of shocked MgO was discussed.

关键词： ESR STUDY MgO AN

Wear Behavior of Cu Matrix Composites Reinforced with Mixture of Carbon and Carbon Nanotubes

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Journal of Wuhan University of Technology(Materials Science) 2009年第2期24卷 254-257页

作者：姜金龙 School of Science Lanzhou University of Technology State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences

In order to improve wear resistance and decrease the cost, carbon and carbon nanotubes reinforced copper matrix composites were fabricated by the power metallurgy method. The effects of carbon （carbon and carbon nanotubes） volume fraction and applied load on the friction coefficient and wear rate under dry sliding of the composites were investigated at room temperature. By scanning electron microscopy （SEM）, the worn surfaces and debris were observed, and wear mechanism was also analyzed and discussed. The experimental wear process consists of the run-in, steady wear and severe wear process with the increasing of sliding distance. Both the friction coefficient and wear rate of the composites first decrease and then increase with the increasing of carbon volume fraction. The minimum friction coefficient and wear rate are obtained when carbon is 4.0vo1%. The wear mechanisms of the composites change from the adhesive wear and delamination wear to abrasive wear with the increasing of carbon volume fraction.

关键词： C/Cu matrix composite power metallurgy wear behavior

A new approach of cascade utilization of the chemical energy of fuel

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Progress in Natural Science:Materials International 2006年第5期16卷 518-523页

作者： HAN Wei, JIN Hongguang and LIN Rumou ( Institute of Engineering Thermophysics, chinese academy of sciences, Beijing 100080, {2. Graduate School of the chinese academy of sciences, Beijing 100080, {2.) [a]Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing China [b]Graduate School of the chinese academy of sciences Beijing China

The indirect release of chemical energy of fuel is investigated, and a new mechanism is proposed to identify the cascade utilization of chemical energy of fuel more clearly. Based on the concept of energy level, the internal phenomenon of the indirect chemical energy release is disclosed, and the equations of energy level describing the utilization of chemical energy and thermal energy during the indirect chemical energy release process are obtained. From theoretical analysis, we find that the superiority of the indirect chemical energy release of fuel comes from the cascade utilization of the fuel's chemical energy. Moreover, the cascade utilization of chemical energy is verified by the investigation of CRGT (chemically recuperated gas turbine). As a result, the thermal exergy obtained from the chemical energy release of fuel increases by 2.% -3 % . The results obtained here may help a deeper understanding of indirect chemical energy release of fuel and provide a theoretical basis for the synthesis of innovative energy systems.

关键词： chemically recuperated gas turbine methane/steam reforming chemical energy level cascade utilization.

Asymmetric Catalytic Hydrogenation Using Rhodium Diphosphinites Derived From D-glucose and D-mannitol

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chinese chemical Letters 2000年第7期11卷 587-588页

作者： Peng JIANG Shi Jie LU(State Key Laboratory of Oxo Synthesis and Selective Oxidation, lanzhou Institute of chemical {2., chinese academy of sciences, lanzhou 730000) chinese Acad Sci Lanzhou Inst Chem Phys State Key Lab Oxo Synth & Select Oxidat Lanzhou 730000 Peoples R China

Three diphosphinites were synthesized for preparing rhodium-diphosphinite complexes. The complexes were used for asymmetric catalytic hydrogenation of amino acid precursor alpha-acetamidocinnamic acid and its methyl e... 详细信息

关键词： asymmetric catalysis hydrogenation rhodium diphosphinites alpha-acetamidocinnic acid

SWINANINE　C＆D，TWO　NEW　DITERPENE　ALKALOIDS　FROM　DELPHINIUM　SWINANENSE　VAR　LEPTOPOGON

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chinese chemical Letters 1995年第4期6卷 309-310页

作者： Suo Hing ZHANG Ji HA Qing Yu OU (lanzhou Institute of chemical {2., chinese academy of sciences, lanzhou730000)a: (Department of Biology, lanzhou University, lanzhou 730000) chinese Acad Sci Lanzhou Inst Chem Phys Lanzhou 730000 Peoples R China lanzhou Univ Dept Biol Lanzhou 730000 Peoples R China

s: Two new diterpene alkaloids named swinanine C and D were isolated from Delphinium swinanense var leptopogon (H. -M. ) W. T. Wang. Their structures were elucidated by means of spectral methods , principally 1H-NHR, ... 详细信息

关键词： VAR LEPTOPOGON SWINANENSE FROM DITERPENE ALKALOIDS DELPHINIUM

Topological chirality and achirality of the closed circular DNAs

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chinese Science Bulletin 1997年第20期42卷 1705-1708页

作者： QIU Wenyuan and XIN Houwen1. Department of chemical physics, University of Science and Technology of {2., Hefei 2.002., {2. 2. Department of Chemistry, lanzhou University, lanzhou 730000, {2. Depaitment of chemical physics University of Science and Technology of China Hefei 230026 China

THE study of the relations between the topological structure and its function is one of the focus-es in modern chemistry and life science. In this note we set up a topological model to de-scribe the ccDNAs on the basis of Seifert construction in knot theory. Our model for theccDNAs helps to determine whether a structure is topologically chiral or achiral. This is one ofthe fundamental biological problems.

关键词： DNA topology knot theory topologiesl chirality topological achirality.