The Na(+)/Ca(2+) exchanger's family of membrane transporters is widely distributed in cells and tissues of the animal kingdom and constitutes one of the most important mechanisms for extruding Ca(2+) from the cell. Two basic properties characterize them. 1) Their activity is not predicted by thermodynamic parameters of classical electrogenic countertransporters (dependence on ionic gradients an...

Z. Naturforsch. 54c, 496-500 (1999); received January 11/March 27. 1999 Dioscorea esculenta. Peroxidase. Ion Exchange C hrom atography. Gel Filtration We isolated two types of peroxidase from the fresh tuber of Dioscorea esculenta using a com bination of ion exchange and gel filtration chrom atography. The results showed one type to be neutral and the other to be strongly ionic. The strongly io...

During the last 50 years, ion exchange membranes have evolved from a laboratory tool to industrial products with significant technical and commercial impact. Today ion exchange membranes are receiving considerable attention and are successfully applied for desalination of sea and brackish water and for treating industrial effluents. They are efficient tools for the concentration or separation o...

Hydrophobic and other non-ionic factors provide many new parameters for the separation of proteins by differential adsorption in addition to the mere difference in charge employed in ion-exchange chromatography. Their application also greatly broadens the range of conditions under which adsorptive protein immobilization, e.g., for the preparation of enzymereactors, is possible.

The well-known and general ‘‘compressibility theorem’’ for pure substances relates kT 52(] ln V/]p)N,T to a spatial integral involving the pair correlation function g . The isochoric inherent structure formalism for condensed phases separates g (2) into two fundamentally distinct contributions: a generally anharmonic vibrational part, and a structural relaxation part. Only the former determines...

This article focuses on perovskite materials for application as cathode material in solid oxide fuel cells. In order to develop new promising materials it is helpful to classify already known perovskite materials according to their properties and to identify certain tendencies. Thereby, composition-dependent structural data and materials properties are considered. Structural data under consider...

SYNOPSIS A method is described for measuring the plasma unsaturated iron-binding capacity in the presence of very high concentrations of iron as iron-dextran. The procedure utilizes 59Fe to label the apotransferrin with subsequent separation of ionic iron from transferrin-bound iron on an ion exchange or Sephadex G.25 column. The unsaturated iron-binding capacity has been measured in rabbits an...

A simulation-based analysis is conducted of the ionic switching times for nanometer-scale binaryoxide “memristor” devices. This analysis is based upon a device model that incorporates nonlinear field-driven ionic transport within the bulk of the memristor. In contrast, prior models of charge transport in such devices have relied upon linear simplifications, or else they have included nonlinear ...

ATP-ADP exchange was estimated in the presence of plasma membrane H+-ATPase of oat (Avena sativa) roots partially purified with Triton X-100 by measuring [14C]ATP formation from [14C]ADP. Most studies were done at 0[deg]C. At pH 6.0 the exchange showed: (a) Mg2+ requirement with a biphasic response giving maximal activity at 152 [mu]M and (b) insensitivity to ionic strength, [Na+], and [K+]. AT...

The general approach to a novel class of functionalized ionic liquids 4-6 bearing grafted diphenylcarbamoylmethylphosphine oxide complexing groups in the cation has been elaborated. The synthetic route comprises the preparation of the intermediate (diphenylphosphorylmethylcarbamoyl)propylimidazole 3, followed by sequential quaternization by alkyl halides (chlorides or bromides) and anionic exch...