排序方式: 共有17条查询结果,搜索用时 15 毫秒
1.
Sidhanath V. Bhosale Mohan B. Kalyankar Santosh V. Nalage Dattatry S. Bhosale Swati L. Pandhare Trupti V. Kotbagi 《合成通讯》2013,43(5):762-769
A simple one-pot synthesis has been developed for the synthesis of 2,4,5-trisubstituted imidazoles using an efficient and recyclable MoO3/SiO2 solid acid catalyst by condensation of benzil or benzoin, benzaldehyde, and ammonium acetate in acetonitrile as a solvent. Using this solid catalyst, the reactions could be carried out under mild reaction conditions with very good yield of imidazoles, up to 95%. This catalyst could be recycled very easily, which makes this methodology environmentally benign. 相似文献
2.
In the present work, mathematical models of three important casting processes are considered namely squeeze casting, continuous casting and die casting for the parameters optimization of respective processes. A recently developed advanced optimization algorithm named as teaching–learning-based optimization (TLBO) is used for the parameters optimization of these casting processes. Each process is described with a suitable example which involves respective process parameters. The mathematical model related to the squeeze casting is a multi-objective problem whereas the model related to the continuous casting is multi-objective multi-constrained problem and the problem related to the die casting is a single objective problem. The mathematical models which are considered in the present work were previously attempted by genetic algorithm and simulated annealing algorithms. However, attempt is made in the present work to minimize the computational efforts using the TLBO algorithm. Considerable improvements in results are obtained in all the cases and it is believed that a global optimum solution is achieved in the case of die casting process. 相似文献
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4.
Kalyankar ND Sharma MK Vaidya SV Calhoun D Maldarelli C Couzis A Gilchrist L 《Langmuir : the ACS journal of surfaces and colloids》2006,22(12):5403-5411
Here, we describe a protocol to bind individual, intact phospholipid bilayer liposomes, which are on the order of 1 microm in diameter, in microwells etched in a regular array on a silicon oxide substrate. The diameter of the wells is on the order of the liposome diameter, so only one liposome is located in each well. The background of the silicon oxide surface is functionalized with a PEG oligomer using the contact printing of a PEG silane to present a surface that resists the adsorption of proteins, lipid material, and liposomes. The interiors of the wells are functionalized with an aminosilane to facilitate the conjugation of biotin, which is then bound to Neutravidin. The avidin-coated well interiors bind the liposomes whose surfaces contain biotinylated lipids. The specific binding of the liposomes to the surface using the biotin-avidin linkage, together with the resistant nature of the background and the physical confinement of the wells, allows the liposomes to remain intact and to not unravel, rupture, and fuse onto the surface. We demonstrate this intact arraying using confocal laser scanning microscopy of fluorophores specifically tagging the microwells, the lipid bilayer, and the aqueous interior of the liposome. 相似文献
5.
A. D. Arsule R. T. Sawale T. M. Kalyankar S. D. Deosarkar 《Journal of solution chemistry》2020,49(1):83-99
The hydration of proteins plays a vital role in biological systems, which inspires us to study the molecular interactions in solutions containing amino acids + water + lactose at different temperatures. Therefore, in view of the biological implications of the hydration behavior of amino acids, in the present document we report the key thermodynamic properties: standard molar volumes, $$V_{2,\phi }^{0}$$, and standard molar compressions, $$\kappa_{S,2,\phi }^{0}$$ of glycine, l-serine, l-proline, l-arginine and l-asparagine in 0.10, 0.30 and 0.50 mol·kg−1 aqueous solutions of lactose from density and ultrasonic velocity data at different temperatures, which helps us to understand the effect of lactose on the hydration of the amino acids. We have also reported refractive indices and molar refractions of the studied systems. The results reveal that lactose has a significant effect on the hydration and electrostriction behavior of the amino acids in general and has a dehydration effect in particular on the amino acids. The results have implications in the role of proteins in biological systems. 相似文献
6.
S. D. Deosarkar T. M. Kalyankar 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2013,87(6):1060-1062
Density, viscosity and refractive index of aqueous solutions of metoprolol succinate of different concentrations (0.005–0.05 mol dm?3) were measured at 38°C. Apparent molar volume of resultant solutions were calculated and fitted to the Masson’s equation and apparent molar volume at infinite dilution was determined graphically. Viscosity data of solutions has been fitted to the Jone-Dole equation and viscosity A- and B-coefficients were determined graphically. Physicochemical data obtained were discussed in terms of molecular interactions. 相似文献
7.
S. D. Deosarkar A. L. Puyad T. M. Kalyankar 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2012,86(5):775-778
Ethambutol (EMB) is a bacteriostatic antimycobacterial drug prescribed to treat tuberculosis. It is bacteriostatic against
actively growing TB bacilli. The density and viscosity of aqueous ethambutol hydrochloride solutions have been studied at
298.15, 301.15 and 304.15 K and at different concentrations (0.255, 0.168, 0.128, 0.087, 0.041, and 0.023 mol dm−3). The apparent molar volume of these solutions for different temperatures and concentrations was calculated from the density
data. The relative viscosities of drug solutions have been analysed by Jones-Dole equation. The limiting apparent molar volumes
have been evaluated for different temperatures. The different properties have been used to study structural properties, structure
formation and breaking properties of drug and solute-solvent interactions in solutions. 相似文献
8.
Analysis of a TE011 mode composite sapphire-rutile dielectric resonator has been carried out to study the temperature variation of resonance
frequency, close to the Cs atomic clock hyperfine frequency of 9.192 GHz. The complementary behavior of dielectric permittivity
with temperature of the composite has been exploited to obtain the desired turning point in the resonant frequency. The frequency
of the composite structure is found to be independent of the shield diameter beyond four times the puck diameter. 相似文献
9.
S. D. Deosarkar M. S. Menkudle P. Shelke T. M. Kalyankar 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2014,88(2):342-345
Present paper reports density, relative viscosity and refractive index of sodium salt of 1-heptanesulfonic acid and 1-octanesulfonic acid at 29°C. Density data has been fitted to Masson empirical relation and limiting apparent molar volumes were evaluated. Viscosity A and B coefficients characterizing ion-ion and ion-solvent interactions have been evaluated by fitting viscosity data in Jone-Doles equation. Experimental and calculated properties support the strong ion-solvent interactions in solution. 相似文献
10.
Sheshanath V. Bhosale Mohan B. Kalyankar Santosh V. Nalage Sidhanath V. Bhosale Cecilia H. Lalander Steven J. Langford 《Supramolecular chemistry》2013,25(8):563-569
The self-assembly of a simple tetraalkyl-substituted protoporphyrin derivative into fibril wire-like nanostructures from CHCl3/cyclohexane solvent mixes is explored. The protoporphyrin IX derivative is synthesised in two efficient steps by amidation of the two propylenic acid groups followed by a cross metathesis of the vinyl groups using Grubbs' second-generation catalyst. The self-assembly of the functionalised protoporphyrin is sensitive to solvent and under favourable conditions forms ‘nanowires’ of micrometre length. The nanowires were characterised by absorption and fluorescence spectroscopy, transmission electron microscopy and atomic force microscopy. 相似文献