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41.
Chandra K. Oza Meenakshi Jain Neelima Jain Dinesh Verma 《Phosphorus, sulfur, and silicon and the related elements》2013,188(2):377-386
Twelve coordinate lanthanide (III) complexes with the general composition [Ln L3Xn(H2O)n] where Ln = Pr(III), Sm(III), Eu (III), Gd (III), Tb (III), Dy (III), X = Cl?1, NO3 ?2, n = 2–7, and L is 1-(4-chlorophenyl)-3-(4-fluoro/hydroxyphenyl)prop-2-en-1- thiosemicarbazone have been prepared. The lanthanide complexes (5) were derived from the reaction between 1-(4-chlorophenyl)-3-(4-fluoro/hydroxyphenyl)prop-2-en-1-thiosemicarbazone (4) with an aqueous solution of lanthanide salt. Chalcone thiosemicarbazone ligand (4) was prepared by the reaction of [1-(4-chlorophenyl)-3-(4-fluoro/hydroxyphenyl)]prop-2-enone (chalcone) (3) with thiosemicarbazide in the presence of hot ethanol. All the lanthanide-ligand 1:3 complexes have been isolated in the solid state, are stable in air, and characterized on the basis of their elemental and spectral data. Thiosemicarbazone ligands behave as bidentate ligands by coordinating through the sulfur of the isocyanide group and nitrogen of the cyanide residue. The probable structure for all the lanthanide complexes is also proposed. The chalcone thiosemicarbazone ligands and their lanthanide complexes have been screened for their antifungal and antibacterial studies. Some of the synthesized lanthanide complexes have shown enhanced activity compared with that of the free ligand. Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file. 相似文献
42.
Anita Gharekhan Ashok N. Oza M. B. Sureshkumar Asima Pradhan Prasanta K. Panigrahi 《Pramana》2010,75(6):1281-1286
Fluorescence characteristics of human breast tissues are investigated through wavelet transform and principal component analysis
(PCA). Wavelet transform of polarized fluorescence spectra of human breast tissues is found to localize spectral features
that can reliably differentiate different tissue types. The emission range in the visible wavelength regime of 500–700 nm
is analysed, with the excitation wavelength at 488 nm using laser as an excitation source, where flavin and porphyrin are
some of the active fluorophores. A number of global and local parameters from principal component analysis of both high- and
low-pass coefficients extracted in the wavelet domain, capturing spectral variations and subtle changes in the diseased tissues
are clearly identifiable. 相似文献
43.
Early research in aerodynamics and biological propulsion was dramatically advanced by the analytical solutions of Theodorsen, von Kármán, Wu and others. While these classical solutions apply only to isolated swimmers, the flow interactions between multiple swimmers are relevant to many practical applications, including the schooling and flocking of animal collectives. In this work, we derive a class of solutions that describe the hydrodynamic interactions between an arbitrary number of swimmers in a two-dimensional inviscid fluid. Our approach is rooted in multiply-connected complex analysis and exploits several recent results. Specifically, the transcendental (Schottky–Klein) prime function serves as the basic building block to construct the appropriate conformal maps and leading-edge-suction functions, which allows us to solve the modified Schwarz problem that arises. As such, our solutions generalize classical thin aerofoil theory, specifically Wu's waving-plate analysis, to the case of multiple swimmers. For the case of a pair of interacting swimmers, we develop an efficient numerical implementation that allows rapid computations of the forces on each swimmer. We investigate flow-mediated equilibria and find excellent agreement between our new solutions and previously reported experimental results. Our solutions recover and unify disparate results in the literature, thereby opening the door for future studies into the interactions between multiple swimmers. 相似文献
44.
A. T. Oza 《Crystal Research and Technology》1989,24(7):711-716
A new material (TMPD)2Ni(CN)4I0.5 · H2O has been prepared (TMPD = N,N,N′,N′-tetramethyl-p-phenylenediamine). The solution and mull absorption spectra in the infrared range indicate the presence of the redox process TMPD+ ⇌ TMPD2+ and tetracyanonickellate (IV) units. 相似文献