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981.
A new method has been proposed to determine the total rare earths and thorium in monazite sand with fluoride electrode. The total amount of thorium and rare earths could be determined by back-titration with standard lanthanum solution in excess fluoride, and the rare earths were titrated directly with fluoride from separate sample. Fluoride electrode was used as indicator electrode. Precision and accuracy were improved by Gran's plot technique. 相似文献
982.
Wen-Juin Shieh G. J. Tsai M. R. Ladisch G. T. Tsao 《Applied biochemistry and biotechnology》1989,22(1):13-29
The formation of cellodextrin-cellobiohydrolase complex was studied by ultraviolet difference spectroscopy. Upon the binding of cellodextrins (G7‐G3), cellobiohydrolase (EC 3.2.1.91) purified fromTrichoderma reesei produced difference spectra having maxima at 289‐293 nm and 283‐286 nm. These spectra are consistent with prior observations reported for lysozyme and amylase. In this case, water soluble cellulose oligomers (i.e., cellodextrins) are shown to interact with tryptophan residue(s) on cellobiohydrolase. The difference spectral maxima observed at acidic or alkaline pH were shifted. This was accompanied by a marked decrease of binding ability of cellobiohydrolase for cellodextrins. The standard free energy change for the association of cellodextrins to the cellobiohydrolase was an order of 4 kcal/gmol. The association constant of enzyme for substrate decreases by 15‐20% as temperature increases from 20 to 48°C. At 25°C, the dissociation constants for the enzyme with respect to cellohexose and cellotriose were estimated to be 1.19 and 1.37 mM, respectively. A decrease in dissociation constants was observed with an increase in the number of glucosyl units from 3 to 6. This suggests that there may be six or more subsites in the active center of cellobiohydrolase. 相似文献
983.
Ming-Daw Tsai 《中国化学会会志》1997,44(3):183-186
Conventionally, natural product chemistry deals with the isolation, characterization, and synthesis of compounds from plants. It a broad sense, natural product chemistry may include all fields of biochemistry. Two projects are presented to illustrate the expanded definition of natural product chemistry. One deals with phosphatidylinositol (PI) and the key enzyme involved in its metabolism, PI-specific phospholipase C. The other project is on the structure-function relationship of human tumor suppressor p16. 相似文献
984.
A rapid, sensitive, and accurate stability-indicating high-performance liquid chromatographic assay method for determining the degradation of carprofen (CPF) is developed and validated under acidic, basic, or photo-irradiated conditions. The analysis is monitored with a Cosmosil 5C18-AR column using a mobile phase of CH3CN-H2O-AcOH (50:49:1, v/v/v) at 260 nm. The developed method satisfies the system suitability criteria, peak integrity, and resolution among the parent drug and its degradation products. The results indicate that the established assay method shows good selectivity and specificity suitable for stability measurements of CPF. CPF is found to be more sensitive to exposure to light and in acidic conditions, but it is stable in a basic medium. The kinetic study of the photodegradation of CPF follows an apparent first-order reaction in a variety of solvents. The solvent effects on the rates of degradation are in the decreasing order of chloroform > dichloromethane > methanol > ethanol > 2-propanol, which is irrelevant to the dielectric constant epsilon. However, the hydrogen-donating ability of the solvents is essential to the photochemical decomposition of CPF. A plot of log k versus the Kirkwood function exhibits a linear relationship in aqueous ethanolic solutions, which implies that degradation proceeds via an ionic mechanism. 相似文献
985.
Wen-Hua Chen Sung-Jeng Jong Ajit Pradhan Ting-Yueh Lee Ikai Wang Tseng-Chang Tsai Shang-Bin Liu 《中国化学会会志》1996,43(4):305-313
The mode of deactivation and coke formation in a H-ZSM-5 zeolite during ethylbenzene disproportionate has been investigated by TGA, adsorption, IR, and 129Xe NMR techniques. The initial rate of deactivation and the total coke content are found to increase with increasing conversion level. Within the range of conversion (54-63%) covered in the present study, the location and extent of coke deposition can be divided into three distinct regions. At low coke content, coke is found to deposit on the Brønsted acid sites and resulted in a notable decrease in catalytic activity. As the amount of coke increases (≤ 7 wt%), while the catalytic activity decreases slightly, most of coke still tends to deposit within the zeolite channels. The slight decrease in catalytic activity is ascribed to steric hindrance by coke residues. When the coke content exceeds 7 wt%, while the activity remains almost constant, the deposition of coke on the external surface of the zeolite crystallites is evident. It is found that neither the pore opening nor the acid site were completely blocked off by coke residues even at the highest coke loading. 相似文献
986.
Hsien-Ju Tien Yan-Hong Tsai Wen-Yuan Yeh Jong-Chuan Yeh Yaw-Kuen Lee Young-Shang Ho 《中国化学会会志》1990,37(1):79-84
Two new sydnones; 3-(o-methoxybenzyl)sydnone(1) and 3-(o-melhoxybenzyl)-4-morpholinomethylsydnone(2) were synthesized from o-methoxybenzylamine and ethyl bromoacetat in moderate yields. 3-(o-,m-,p-Fluorophenyl)sydnones were prepared from the corresponding fluoroaniline and chloroacetic acid in higher yields with a conventional method. From the biological activity test, 1 shows significant response of coronary dilation test, collagen induced platelet aggregation inhibition, local anesthetic and moderate cardiotropic activity. In addition, 1 also leads to anticonvuls, muscle relaxation and behavior depression. But 2 only shows inhibition of collagen induced platelet aggregation and antiwrithing. 3-(p-Fluorophenyl)sydnone (5) shows significant response of coronary dilation, collagen induced platelet aggregation inhibition, moderate cardiotropic activity, antiwrithing and local anesthetic But 3-(o-Fluorophenyl)sydnone(3) and 3-(m-fluorophenyl)sydnone(4) only show coronary dilation and moderate cardiotropic activity. 相似文献
987.
Wen-Hua Chen Shing-Jong Huang Chiun-Shen Lai Tseng-Chang Tsai Huang-Kuei Lee Shang-Bin Liu 《Research on Chemical Intermediates》2003,29(7-9):761-772
The effects of binder, coking and regeneration on the acid properties of H-mordenite zeolite during toluene disproportionation reaction (TDP) have been investigated by solid-state 31P-MAS-NMR of various adsorbed phosphorous probe molecules in conjunction with elemental analysis by ICP-MS technique. A series of fresh, spent and regenerated mordenite-based commercial catalysts were examined and the results were also compared with binder-free H-mordenite zeolite and unformulated γ-alumina binder. It is found that parent H-mordenite zeolite possessed only Brønsted acidity, which is responsible for the observed catalytic activity. In contrast, the γ-Al2O3 binder exhibited only Lewis acidity and plays a minor role during the catalytic reaction. While the amount of strong Brønsted acid sites decreased rapidly during initial coking, it reached a plateau at a total coke content of ca. 7 wt%, corresponding to ca. 80% decrease in total acidity. That the catalyst remained active even under deep coke deposition (>7 wt%) condition indicated catalytic activity may be invoked by subsequent coking taking place on the external surface rather than intracrystalline channels of the zeolite catalyst. Furthermore, upon catalyst regeneration treatment, ca. 75% of the total acidity could be effectively recovered. 相似文献
988.
Shou-Shing Hsieh Ching-Fang Huang Jenn-Kun Kuo Huang-Hsiu Tsai Sheng-Huang Yang 《Journal of Solid State Electrochemistry》2005,9(3):121-131
A SU-8 photoresist microfabrication process was developed for micro proton exchange membrane fuel cell flow structures for both anode and cathode flow field plates with a cross section of 5 cm2 (22.5 mm×22.5 mm) and thickness (for a single cell) of about 750 µm. The new design for flow field plates would have SU-8 used as not only a photoresist but also as a microstructure material. A thickness of 30 nm Pt sputter loading deposited onto a Nafion 117 for membrane electrode assembly was made, with both scanning electron microscopy and atomic force microscopy characterization. Air flows were completed in hydrogen fuel cells with air breathing and forced air flows of low input pressure as well as low velocity. Performance tests of polarization curves and power density distribution as well as impendence measurements were conducted and discussed to examine the effects of orientation of the cathode surface with five hydrogen feeding rates as well as different airflow feeding modes. 相似文献
989.
Nickel(II) chelate of 2–picolylamine has been studied spectrophotometrically in aqueous solution at 25°C and at an ionic strength of 0.3 M. The formation of pink color chelate was pH dependent, and the optimum pH range was between 7.0 to 8.5. Its mole ratio of ligand to nickel(II) ion was found to be 3 to 1 stoichiometry and the formation constant, logK, was determined as 13.31 ± 0.10. By using the wavelength 535 run, determination of trace amount of nickel(II) ion with the sensitivity of 5.28 τ/Cm2 was possible. Enthalpy and entropy changes characterizing the formation of the chelate have been calculated as follows: ΔG°=–8.15Kcal mole-1, ΔH°=–9.65 Kcal mole-1, ΔS°=28.5eu mole-1. 相似文献
990.