The Experts below are selected from a list of 14763 Experts worldwide ranked by ideXlab platform
Fan Su-fang - One of the best experts on this subject based on the ideXlab platform.
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Synthesis and spectral properties of new coumarin formamides
Journal of Molecular Science, 2010Co-Authors: Fan Su-fangAbstract:To derign the better optical and biologyical activity compounds,four new compounds(3a～3d)of coumarin formamides were synthesized from substituted coumarin-3-formylchlorides and 2-aminobenzothiazole.The structures of title compounds were characterized by HRMS,1H-NMR and FT-IR.The relations between the UV spectra and the Fluorescent Spectrum and molecular structures of 3a～3d were studied.The result indicates that the new compounds have longer maximum absorption wavelength in the UV Spectrum and exhibit stronger Fluorescent emission in the Fluorescent Spectrum than the original materials because of the increasing conjugation system.
Yuanfang Wei - One of the best experts on this subject based on the ideXlab platform.
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synthesis gc selective dna binding and topoisomerase ii inhibition activities of ruthenium ii polypyridyl complex containing 11 aminopteridino 6 7 f 1 10 phenanthrolin 13 12h one
Journal of Inorganic Biochemistry, 2008Co-Authors: Feng Gao, Hui Chao, Feng Zhou, Xin Chen, Yuanfang WeiAbstract:Abstract A DNA-intercalating Ru(II) polypyridyl complex [Ru(bpy) 2 (appo)] 2+ (bpy = 2,2′-bipyridine, appo = 11-aminopteridino[6,7- f ][1,10]phenanthrolin-13(12 H )-one) has been synthesized and characterized by elemental analysis, electrospray mass spectra, 1 H NMR, UV/Vis Spectrum, Fluorescent Spectrum and electrochemistry. The DNA-binding, photocleavage, and topoisomerase inhibition of the complex was studied. Interestingly, the complex binds to DNA via an intercalative mode with preference for GC sequences and cleaves the pBR322 DNA upon irradiation. In addition, the complex shows high inhibition activity against topoisomerase II by interfere the DNA religation.
Giuseppe Tondello - One of the best experts on this subject based on the ideXlab platform.
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Performances of metachrome II as a scintillator for the far and vacuum ultraviolet spectral region
Optical Engineering, 1996Co-Authors: Leonardo Placentino, Giampiero Naletto, Emanuele Pace, Giuseppe TondelloAbstract:A couple of metachrome II samples having different thicknesses are tested as the downconverter Fluorescent layer in the far and vacuum UV (58 to 297 nm). Their performance is compared with that obtained by tetraphenyl butadiene, another scintillator widely used in this spectral region. The emission angular distribution, the Fluorescent Spectrum, and the absolute conversion efficiencies are measured for all of the phosphors. The results show some peculiar effects related to the incident angle with the surface where the phosphors are deposited; moreover, they show that tetraphenyl butadiene offers higher efficiency than metachrome II, but also that the latter shows good efficiency throughout the investigated spectral region. This fact indicates that interesting applications can be performed with metachrome II when it is used as the downconverter phosphor with silicon detectors whose spectral response matches well the emission Spectrum of metachrome II. For example, this could enable having CCDs sensitive in the extreme UV region, without requiring very expensive and sophisticated UV-sensitive treatments.
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Fluorescence of metachrome in the far- and vacuum-ultraviolet spectral region
X-Ray and Ultraviolet Sensors and Applications, 1995Co-Authors: Giampiero Naletto, Emanuele Pace, Leonardo Placentino, Giuseppe TondelloAbstract:Some measurements have been performed in order to fully characterize metachrome as down- converter Fluorescent layer in the far and vacuum ultraviolet, from 46 up to 254 nm. In particular, a couple of samples having different thickness provided by Photometrics Inc. have been tested and their performances have been compared with the ones obtained by tetraphenyl butadiene (TPB), another scintillator widely used in this spectral region. The emission angular distribution, the Fluorescent Spectrum and the absolute conversion efficiencies have been measured for all the phosphors. The results show that TPB offers higher efficiency than metachrome, but also that the latter is well efficient in all the investigated spectral region. This is interesting in the case of using this phosphor as down-converter with silicon detectors, so permitting for example to have CCD sensitive also in the extreme ultraviolet region.
Tung Tsang - One of the best experts on this subject based on the ideXlab platform.
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Study of optical properties of Nd:YAG single-crystal optical fiber
Chinese Physics, 1992Co-Authors: Zhang Songbin, Ding Zuchang, Dong Mianyu, Zhou Binhe, Tong Limin, Tung TsangAbstract:This paper presents the absorption Spectrum, Fluorescent Spectrum and scattering characteristics of ND:YAG single-crystal optical fiber (SCF). The measured results indicate that the Nd:YAG SCF grown by means of the LHPG method is in agreement with the bulk crystal in the properties such as absorption Spectrum, and Fluorescent Spectrum. The defects and diameter variations of the SCF are also analyzed
Zhang S - One of the best experts on this subject based on the ideXlab platform.
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Study on optical properties of Nd: YAG single-crystal optical fiber
Acta Optica Sinica, 1992Co-Authors: Zhang SAbstract:This paper presents the absorption Spectrum, Fluorescent Spectrum and scattering characteristic of Nd:YAG single-crystal optical fiber(SCF). The measured results indicate that the Nd: YAG SCF grown up by means of LHPQ method is conformity with the bulk crystal in the properties such as absorption Spectrum, Fluorescent Spectrum. The defects and diameter variations of the SCF are also analysed.