Kinetics of the Rapid Base Catalyzed Iodination of Imidazole and 2-Methylimidazole by Molecular Iodine in Aqueous Medium: pH Effect

2013 ◽  
Vol 45 (6) ◽  
pp. 355-362 ◽  
Author(s):  
S. L. Bonde ◽  
V. T. Dangat ◽  
R. P. Bhadane ◽  
V. S. Joshi
Keyword(s):  
Aqueous Medium ◽  
Ph Effect ◽  
Molecular Iodine ◽  
Medium Ph ◽  
Kinetics Of

Studies on Adsorption Kinetics of Norfloxacin Using Nano Alumina in Aqueous Medium

2020 ◽  
Vol 10 (2) ◽  
pp. 227-239
Author(s):  
Arvind Parashar ◽  
Shalini Sikarwar ◽  
Rajeev Jain
Keyword(s):  
Aqueous Medium ◽  
Adsorption Kinetics ◽  
Nano Alumina ◽  
Kinetics Of

scholarly journals Nanosized centers for mercury(II) ions adsorption on a surface of modified silica

2008 ◽  
Vol 6 (4) ◽  
pp. 581-591 ◽  
Author(s):  
Lyudmila Belyakova ◽  
Oleksandra Shvets ◽  
Diana Lyashenko
Keyword(s):  
Aqueous Medium ◽  
Batch Adsorption ◽  
Modified Silica ◽  
First Order ◽  
Chemically Modified ◽  
First Order Kinetics ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Second Order Equations

AbstractThe present work investigates the adsorptive interactions of Hg(II) ions in aqueous medium with hydroxylated silica, aminopropylsilica and silica chemically modified by β-cyclodextrin. Batch adsorption studies were carried out with various agitation times and mercury(II) concentrations. The maximum adsorption was observed within 15–30 min of agitation. The kinetics of the interactions, tested with the model of Lagergren for pseudo-first and pseudo-second order equations, showed better agreement with first order kinetics (k1 = 3.4 ± 0.2 to 5.9 ± 0.3 min−1). The adsorption data gave good fits with Langmuir isotherms. The results have shown that β-cyclodextrin-containing adsorbent has the largest adsorption specificity to Hg(II): K L = 4125 ± 205 mmol−1. “β-cyclodextrin-NO3-” inclusion complexes with ratio 1: 1 and super molecules with composition C42H70O35 ⊎ 3 Hg(NO3)2 are formed on the surface of β-cyclodextrin-containing silica.

Transfer of phosphatidic acid from liposomes to cells is collision dependent

1989 ◽  
Vol 256 (3) ◽  
pp. C522-C531 ◽  
Author(s):  
K. J. Longmuir ◽  
L. A. Malinick
Keyword(s):  
Phosphatidic Acid ◽  
Aqueous Medium ◽  
Monolayer Culture ◽  
Monomer Concentration ◽  
Cell Transfer ◽  
Lipid Transfer ◽  
Free Diffusion ◽  
Kinetics Of ◽  
Dependent Mechanism ◽  
Group 1

The kinetics of lipid transfer from unilamellar liposomes to cells in monolayer culture were determined for a fluorescent phosphatidic acid, 1-palmitoyl-2-[6-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)aminocaproyl] -sn-glycerol 3-phosphate (C6-NBD-PA), and for the analogous phosphatidic acid without the fluorescent NBD group, 1-palmitoyl-2-caproyl-sn-[U-14C] glycerol 3-phosphate (C6-[14C]PA). Initial rates of liposome-to-cell transfer were measured at 2 degrees C under conditions in which the concentration of diffusible monomer in the aqueous medium was constant during the course of an experiment and was independent of total liposome concentration. Rates were similar for C6-NBD-PA and C6-[14C]PA, indicating that the NBD group does not significantly alter the transfer kinetics. It was found that liposome-to-cell transfer was dependent on 1) the mole fraction of diffusible lipid in the liposomes, 2) the liposome concentration, and 3) the cell density. The dependence of rate on the liposome concentration (observed under conditions in which aqueous monomer concentration remained constant) cannot be explained by a liposome-to-cell transfer mechanism involving the free diffusion of monomers through the aqueous medium. Instead, the data are consistent with a collision-dependent mechanism of monomer transfer that occurs when liposome and cell membranes come into contact but do not fuse.

scholarly journals Spectral properties and photophysical behaviour of water soluble cationic Mg(II) and Al(III) phthalocyanines

2014 ◽  
Vol 12 (3) ◽  
pp. 403-415 ◽  
Author(s):  
Mopelola Idowu ◽  
Yasin Arslanoğlu ◽  
Tebello Nyokong
Keyword(s):  
Aqueous Solution ◽  
Aqueous Medium ◽  
Spectral Properties ◽  
Photophysical Properties ◽  
Strong Dependence ◽  
Water Soluble ◽  
Quantum Yields ◽  
Fluorescence Lifetimes ◽  
High Solubility ◽  
Medium Ph

AbstractPeripherally and non-peripherally tetrasubstituted-[(N-methyl-2-pyridylthio)]phthalocyaninato magnesium (II) (5 and 6) and chloro aluminium (III) (7 and 8) tetraiodide have been synthesized and characterized. The photophysical properties of the complexes in dimethyl sulfoxide (DMSO) and aqueous medium in the presence and absence of cremophore EL have been studied. These complexes show high solubility in aqueous medium though they were aggregated. The triplet state quantum yields (FT) and the triplet lifetimes (tT) were found to be higher in DMSO with ΦT ranging from 0.32 to 0.51, while tT ranged from 282 to 622 ms in DMSO, compared to aqueous medium (pH 7.4 buffer) where ΦT ranged from 0.15 to 0.19 and tT from 26 to 35 ms. Addition of cremophore EL in aqueous solution resulted in partial disaggregation and increased photoactivity. The fluorescence lifetimes of the complexes showed strong dependence on their immediate environment. The ionic magnesium(II) and aluminium(III) phthalocyanines strongly bind to bovine serum albumin (BSA).

Synthesis of (E)-β-iodo vinylsulfones via iodine-promoted iodosulfonylation of alkynes with sodium sulfinates in an aqueous medium at room temperature

2017 ◽  
Vol 19 (5) ◽  
pp. 1255-1258 ◽  
Author(s):  
Yadong Sun ◽  
Ablimit Abdukader ◽  
Dong Lu ◽  
Haiyan Zhang ◽  
Chenjiang Liu
Keyword(s):  
Aqueous Medium ◽  
Room Temperature ◽  
Molecular Iodine

An efficient and facile molecular iodine-promoted method for the synthesis of (E)-β-iodo vinylsulfones with high regio- and stereoselectivity using water as the solvent at room temperature is presented.

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