Kinetics of proton depended oxidation of diethylthiourea with methylene green in aqueous medium

2012 ◽  
Vol 4 (8) ◽  
Author(s):  
Tehseen Ahmed
Keyword(s):  
Aqueous Medium ◽  
Methylene Green ◽  
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.

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