排序方式: 共有11条查询结果,搜索用时 15 毫秒
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Oncogenes and Tumor Suppressor Genes in Photocarcinogenesis 总被引:3,自引:0,他引:3
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Meccanica - The reflection and transmission of surface waves propagating over an irregular surface located on a flexible base in an ice-covered fluid are analyzed within the context of linearized... 相似文献
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Bibhuti B. Samal Sagarika Sahu Braja B. Chinara S. Nanda P. K. Otta L. M. Mohapatro Trijama R. Mohanty A. R. Ray K. C. Singh 《Journal of polymer science. Part A, Polymer chemistry》1988,26(12):3159-3166
Graft copolymerization of acrylonitrile (AN) onto sisal fibers (chemically modified) was studied using the Mn(III)/EDTA redox system in aqueous solution. The effects of time, monomer (AN), metal ion [Mn(III)] substrate [ethylene diamine tetraacetic acid (EDTA)], temperature, and acid concentration on graft yield have been studied. The effects of thiourea on the graft yield has also been studied. A suitable mechanism is proposed. 相似文献
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Acharya Sagarika Mishra Sujata Chand Sunita 《Journal of Radioanalytical and Nuclear Chemistry》2017,314(3):1813-1824
Journal of Radioanalytical and Nuclear Chemistry - Influence of various parameters affecting the extraction of La(III) from acidic nitrate medium has been analysed. The extraction of 99.1% La(III)... 相似文献
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A co-culture acclimatized to H-acid was used to degrade Reactive Black 5 (RB 5), a bis azo dye having central H-acid function. The effect of substrate concentration, pH and medium composition on the decolorization has been investigated. Decolorization was found independent of pH. Luria-Bertani broth favored decolorization over Yeast Extract; however further decolorization experiments have been conducted using Yeast Extract. The Michaelis-Menten Kinetic model is found to describe the dependence of specific decolorization rate on the RB 5 dye concentration. 相似文献
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Subhashree P. DashSagarika Pasayat SaswatiHirak R. Dash Surajit DasRay J. Butcher Rupam Dinda 《Polyhedron》2012,31(1):524-529
Some new oxovanadium(V) complexes, [VOL1-3(OEt)(EtOH)] (1-3), have been reported, which were obtained from the reaction of the Schiff bases H2L1-3 (where H2L1 = the salicylhydrazone of diacetyl monoxime; H2L2 = the 4-methoxy salicylhydrazone of diacetyl monoxime and H2L3 = the 4-hydroxy salicylhydrazone of diacetyl monoxime) with VO(acac)2 in a 1:1 molar ratio. Three 4-R-aroylhydrazoneoximes (V) have been used as ligands in the present study, differing in the inductive effect of the substituent R (R = H, OCH3 and OH), in order to observe their influence, if any, on the redox potentials and biological activity of the complexes. All the synthesized ligands and metal complexes were successfully characterized by elemental analysis, IR, UV-Vis and NMR spectroscopy. An X-ray diffraction study of [VOL1(OEt)(EtOH)] (1) reveals that the metal center has a distorted octahedral O5N coordination sphere, where the O,N,O donor ligand and the ethoxo group constitute a satisfactory O3N basal plane. Cyclic voltammetry of the complexes show a quasi-reversible cyclic voltammetric response in the potential range 0.29-0.36 V involving a single electron V(V)-V(IV) reduction. The complexes have also been screened for their antibacterial activity against Escherichia coli, Bacillus, Proteus and Klebsiella. Minimum inhibitory concentrations of these complexes and the antibacterial activities indicate compound 1 as the potential lead molecule for drug design. 相似文献
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The dissociation constants (pK's) of aldimines, (o/p) hydroxybenzylidene-(4/6)-nitro-2-aminobenzothiazoles, have been determined spectrophotometrically in the absence and presence of ionic and nonionic surfactant assemblies at 27 degrees C. Substantial shifts in the pK's of the aldimines has been observed in the presence of the organized assemblies compared to water. The results have been attributed to the surface charge of the micelle, the effective hydrophobicity of the surfactants, and field and resonance effects due to NO(2) group substitution. Surfactant assemblies are found to have randomly arranged hydrophobic chains leading to exposure of some of the hydrocarbon chain segments to bulk water. The results also support the presence of intramolecular H-bonding in the o-hydroxybenzylidene-(4/6)-nitro-2-aminobenzothiazoles. 相似文献
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The present study aimed to standardize the Ayurvedic preparation Haridra Khanda containing Curcuma longa as a major ingredient. Various physicochemical parameters such as alcohol-soluble extractive, water-soluble extractive, total ash, and acid-insoluble ash were determined according to the Ayurvedic Pharmacopoeia of India. Microscopic evaluation of the formulation revealed the presence of various diagnostic cell structures of C. longa. Trace metal analysis indicated the absence of toxic metals such as As, Cd, Hg, and Pb. High-performance thin-layer chromatographic (HPTLC) fingerprint patterns at multiple wavelengths (254, 366, and 430 nm) identified the number of components present at each wavelength. The bioactive markers curcumin (C1), demethoxycurcumin (C2), and bisdemethoxycurcumin (C3) were quantified by using a simple, rapid, and efficient HPTLC method using plates precoated with silica gel 60F254 stationary phase. The instrumental precision [coefficient of variation (CV)] was 0.51, 0.64, and 0.79% and the repeatability of the method (CV) was 0.89, 1.11, and 0.95%, respectively, for C1 to C3. Limits of detection and quantitation for compounds C1 to C3 were 20, 20, and 15 ng and 50, 40, and 50 ng, respectively. Response was a linear function in the ranges of 50-350, 40-240, and 50-300 ng with correlation coefficient (r) = 0.9998, 0.9995, and 0.9992, respectively, for C1 to C3. The mean recovery values of 99.63 (C1), 98.65 (C2), and 98.97% (C3) indicated the excellent accuracy of the method. It is shown that HPTLC can be applied successfully for the marker evaluation of the formulation containing C. longa. 相似文献
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