in this research, polyvinylchloride based composite heterogeneous cation exchange membranes were prepared by the solution casting technique. chitosan-co-iron nickel oxide nanoparticles were utilized as membrane surface modifier to improve the membranes electrochemical properties. the effect of additive nanoparticle concentration in the modifier solution on the properties of composite membranes ...

The mechanism of melibiose symport by the melibiose permease of Escherichia coli was studied by looking at the modifications of the facilitated diffusion properties of the permease which arise upon substitution of the coupled cations (H+, Na+, or Li+). Kinetic analysis of melibiose influx and efflux down a concentration gradient, exchange at equilibrium, and counterflow were examined in de-ener...

Introduction: Previous studies and our works have indicated several cation channels in the rat brain mitochondrial inner membrane. In this work, we report the single-channel characterization of a cation channel from the rat brain mitochondrial inner membrane incorporated into a planar lipid bilayer. Methods: After removing and homogenizing the adult rat brain, its supernatant was centrifuged...

Abstract The deposition of several alternating anion- and cation-exchange surface layers (layer-by-layer method) is a promising technique for the modification ion-exchange membranes, which makes it possible to essentially increase their selectivity singly charged ions. This paper presents one-dimensional model, based on Nernst–Planck–Poisson equations describes competitive transfer doubly ions ...

the sorption and desorption behaviors of eu(iii) from aqueous solutions with cation exchange resins containing carboxyl groups (d155 resin) were studied in terms of varied eu(iii) concentration, adsorbent dosage, ph, contact time and temperature. batch shaking sorption experiments were carried out to evaluate the performance of d155 resin in the removal of eu(iii) from aqueous solutions. the lo...

abstract plant nonspecific lipid transfer proteins (nsltps) are divided into nsltp1 and nsltp2. the existence of an internal hydrophobic cavity, is a typical characteristic of nsltps that serves as the binding site for lipid substrates. in this communication a simple, rapid and low-cost alternative method was developed for purification of nsltp2 from rice paddy. after extracting, final supernat...

Water saturation and cation exchange capacity are the most significant parameters used to calculate a hydrocarbon zone potential. In clean formations, by applying the famous Archie model, which assumes that in the formation the only electric conductor is the formation water, the water saturation can be calculated. Additionally, in shaly sand formations this assumption may not be true as the ion...