نتایج جستجو برای: ionic strength effect

تعداد نتایج: 1838541  

2014
Sebusi Odisitse Graham E Jackson

The thermodynamic equilibria of nickel(II) with N,N'-di(aminoethylene)-2,6-pyridinedicarbonylamine (L1), Bis-(N,N-dimethylethyl)-2,6-pyridinedicarboxamide (L2), and N,N'-bis[2(2-pyridyl)-methyl]pyridine-2,6-dicarboxamide (L3) have been studied at 25°C and an ionic strength of 0.15 mol dm(-3) by glass electrode potentiometry. The protonation and formation constants added to blood plasma model pr...

Journal: :Journal of mathematical analysis and applications 2008
Y C Zhou Michael Holst J Andrew McCammon

In this paper we propose a nonlinear elasticity model of macromolecular conformational change (deformation) induced by electrostatic forces generated by an implicit solvation model. The Poisson-Boltzmann equation for the electrostatic potential is analyzed in a domain varying with the elastic deformation of molecules, and a new continuous model of the electrostatic forces is developed to ensure...

Journal: :Biochemistry 1978
A J Ahmed H T Smith M B Smith F S Millett

The reduction of cytochrome c by succinate-cytochrome c reductase was studied at very low cytochrome c concentrations where the reaction between cytochrome c1 and cytochrome c was rate limiting. The rate constant for the reaction was found to be independent of ionic strength up to 0.1 M chloride, and to decrease rapidly at higher ionic strength, suggesting that the interaction between cytochrom...

2003
Mark C. Walker Jose J. Pueyo Jose A. Navarro Gordon Tollin

The influence of electrostatic forces on the formation of, and electron transfer within, transient complexes between redox proteins was examined by comparing ionic strength effects on the kinetics of the electron transfer reaction between reduced ferredoxins (Fd) and oxidized ferredoxinNADP+ reductases (FNR) from Analmena and from spinach, using laser flash photolysis techniques. With the Anaba...

2013
Peter Wilhelm Ingrid Pilz

Studies of conformational changes of tRNA de­ pending on the ionic strength of the solution and the nature of the counter ions have become a subject of interest because of the probable role of its different conformational states for the functioning of the tRNA molecule in protein biosynthesis [1]. Results in this field obtained recently e.g. by pulsed nano­ second fluorometry [2] and laser ligh...

2001
P. BERGVELD D. N. REINHOUDT

After discussing the features of a differential ISFET/REFET measuring concept, the published attempts to construct a proper REFET are summarized. It is concluded that the present REFETs are based upon the addition of a blocking polymeric layer to the gate surface of an ISFET, but that this approach fails with respect to the required insensitivity to ionic strength variations as well as with res...

2013
A. M. POSNER

The reversíbilíty of the adsorption of phosphate on goethite was measured by dlluting suspensions of goethite on which phosphate was adsorbed with large volumes oí phosphate-frce solution at the same ioníe strength. The effect on the reversibility of various adsorptíon and desorption conditions was studied, particularly pH, temperature, ionic strength and time of reaction. The apparent irrevers...

Journal: :Molecules 2017
Qidong Hou Meiting Ju Weizun Li Le Liu Yu Chen Qian Yang

Pretreatment is very important for the efficient production of value-added products from lignocellulosic biomass. However, traditional pretreatment methods have several disadvantages, including low efficiency and high pollution. This article gives an overview on the applications of ionic liquids (ILs) and IL-based solvent systems in the pretreatment of lignocellulosic biomass. It is divided int...

2010
Ming GENG Zhenhao DUAN

A thermodynamic model is presented to calculate the oxygen solubility in pure water (273–600 K, 0–200 bar) and natural brines containing Na, K, Ca, Mg, Cl , SO4 2 , over a wide range of temperature, pressure and ionic strength with or close to experimental accuracy. This model is based on an accurate equation of state to calculate vapor phase chemical potential and a specific particle interacti...

2009
Parashuram Mishra

The title reaction was investigated in aqueous alkaline medium. A first dependence in Bi (V)) concentration and a order in both Vanillin and alkali were obtained at the concentration studied. The effect of added products and the ionic strength of the reaction medium have no significant effect on the reaction rate. Effect of temperature on the rate of reaction has also been studied and Eyring’s ...

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