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High-performance liquid chromatographic determination of histamine N-methyltransferase activity 总被引:1,自引:0,他引:1
H Fukuda A Yamatodani I Imamura K Maeyama T Watanabe H Wada 《Journal of chromatography. A》1991,567(2):459-464
A method for the determination of histamine N-methyltransferase (HMT) activity by high-performance liquid chromatography based on post-column derivatization with omicron-phthalaldehyde is described. The determination involves the separation of the substrate, histamine, from its product. N tau-methylhistamine, using a weak cation exchanger, followed by on-line derivatization of these imidazoleamines with omicron-phthalaldehyde and their detection and quantitation with a fluorimetric detector. This assay method is suitable for the measurement of HMT activity during enzyme purification. 相似文献
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Sigeru Torii Kenji Uneyama Michio Ono Hiromitsu Tazawa Setsuo Matsunami 《Tetrahedron letters》1979,20(48):4661-4662
A regioselective ω-epoxidation of polyisoprenoids has been realized by the sodium bromide promoted electrochemical oxidation in a mixed solvent (MeCN-THF-H2O). 相似文献
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For a general non-Gaussian stationary linear process, quasi-maximum likelihood estimation of a subset of the parameters of the spectral density is considered when the complementary subset is suspected to be superfluous. A preliminary test quasi-maximum likelihood estimator (q-MLE) of parameters is introduced and, in the light of its mean square error, is compared with the restricted and unrestricted q-MLE. 相似文献
27.
One-step transformation of olefins into allylic alcohols and ethers has been accomplished by electrooxidative oxyselenenylation-deselenenylation sequence. The electrochemical process furnished efficient syntheses of dl-marmelolactone and dl-rose oxide . 相似文献
28.
Catalina Arnau Ramn Carb Sigeru Huzinaga 《International journal of quantum chemistry》1972,6(5):843-847
The procedure proposed by Silverstone and others to modify virtual levels in SCF theory is extended as a technique to be used in any type of generalized secular equations. Some useful results are obtained. 相似文献
29.
Fumitoshi Momose Koichiro Matsunaga Kazunori Matsui Sigeru Semura Michihisa Kyoto Azusa Shida 《Journal of Sol-Gel Science and Technology》2002,23(1):79-83
The luminescence spectra and lifetime of tris(2,2-bipyridine)ruthenium(II), Ru(bpy)3
2+, were studied in sol-gel reaction systems of tetramethoxysilane (TMOS) and titanium(IV) isopropoxide (TTIP) with HCl. Luminescence lifetime in the TMOS system increased as the sol-gel reaction proceeded, because diffusion-controlled luminescence quenching such as oxygen and collisional quenching with solvent molecules were suppressed in the rigid matrices. On the other hand, luminescence lifetime in the TTIP system decreased during the sol-gel reaction. The decrease in lifetime was ascribed to electron transfer from photoexcited Ru(bpy)3
2+ to the conduction band of the TiO2 xerogels. Extended X-ray absorption fine structure (EXAFS) measurements were done to associate lifetime in the Si-Ti xerogels with the structures of Ti4+ sites in the xerogels. 相似文献
30.
Yoshiko Sakai Hiroshi Tatewaki Sigeru Huzinaga 《Journal of computational chemistry》1981,2(1):108-125
Compact contracted Gaussian basis sets introduced in the preceding article are tested for ab initio molecular calculations on molecules containing third-row atoms (Na through Cl). It is found that the effect of splitting valence orbitals is essential for these molecules and addition of polarization functions to split basis sets can yield computed geometries, spectroscopic constants, and atomization energies in close agreement with the result of near Hartree–Fock calculations. 相似文献