Although the Na(+)/K(+) pump is one of the key mechanisms responsible for maintaining cell volume, we have observed experimentally that cell volume remained almost constant during 90 min exposure of guinea pig ventricular myocytes to ouabain. Simulation of this finding using a comprehensive cardiac cell model (Kyoto model incorporating Cl(-) and water fluxes) predicted roles for the plasma memb...

This paper concerns with the behavior of an electrodeionization (EDI) system for concentration of citric acid from fermentation broth. Commercially cation-exchange membrane (MC-3470) and anion-exchange membrane (MA-3475) were used as ionic selective barriers of the EDI stack. The diluted compartments of the EDI stack were filled with mixed ion-exchange resins (purolite strong acid cation-exchan...

Cation exchange capacity (CEC) is one of the most important soil attributes which control some basic properties of soil such as acidity, water and nutrient retaining capacity. However, the measurement of cation exchange capacity in large areas is time consuming and requires high expenses. One way to save time and expenses is to use simple soil covariates and geostatistical methods in mapping CE...

We investigated in detail the permeation selectivity electro-dialysis of Na+, K+, Mg2+ and Ca2+ both binary quaternary mixtures using a supported liquid membrane (SLM). The SLM consisted organic 2-nitrophenyl octyl ether (NPOE) containing lipophilic anion, i.e. tetrakis[3,5-bis(trifluoromethyl)phenyl]borate, as cation-exchanging site, which was used to fill pores supporting AccurelR. first dete...

The goal of this study was to determine the mechanisms involved in the transport of the organic cation, tetraethylammonium (TEA), across the apical membrane of OK cells. [14C]TEA accumulated in OK cell monolayers reaching equilibrium in 2 h. The uptake of [14C]TEA at equilibrium was dependent upon temperature and was inhibited by sodium azide and by various organic cations, including N1-methyln...

14 The mechanisms of sorption of four steroidal hormones – estradiol, estrone, progesterone and 15 testosterone – to electrodialysis (ED) membranes were investigated as a function of solution pH 16 and presence of humic acid (HA). Hormone-membrane partition coefficients (log KAEM/CEM) 17 determined through sorption isotherm experiments suggested that hormone sorption was due to 18 hydrogen bond...