منابع مشابه
Mechanism of ion transport across bilayer membranes
Introduction The facilitated transport of ions and polar molecules across biological membranes is essential for normal cell function and is also a major objective in the rapidly growing field of drug delivery. Researchers strive to simulate naturally occurring channel-forming proteins or carrier molecules. The resultant compounds may utilize endogenous peptide sequences or may be novel organic ...
متن کاملIon Transport across Biological Membranes by Carborane-Capped Gold Nanoparticles
Carborane-capped gold nanoparticles (Au/carborane NPs, 2-3 nm) can act as artificial ion transporters across biological membranes. The particles themselves are large hydrophobic anions that have the ability to disperse in aqueous media and to partition over both sides of a phospholipid bilayer membrane. Their presence therefore causes a membrane potential that is determined by the relative conc...
متن کاملFerrous ion transport across chloroplast inner envelope membranes.
The initial rate of Fe(2+) movement across the inner envelope membrane of pea (Pisum sativum) chloroplasts was directly measured by stopped-flow spectrofluorometry using membrane vesicles loaded with the Fe(2+)-sensitive fluorophore, Phen Green SK. The rate of Fe(2+) transport was rapid, coming to equilibrium within 3s. The maximal rate and concentration dependence of Fe(2+) transport in predom...
متن کاملPhloretin-induced changes in ion transport across lipid bilayer membranes
Phloretin, the aglucone derivative of phlorizin, increases cation conductance and decreases anion conductance in lipid bilayer membranes. In this paper we present evidence that phloretin acts almost exclusively by altering the permeability of the membrane interior and not by modifying the partition of the permanent species between the membrane and the bulk aqueous phases. We base our conclusion...
متن کاملHybrid Molten/Solid In2O3-Bi2O3 Oxygen Ion Transport Membranes
The hybrid molten/solid In2O3 - 30-48 wt.% Bi2O3 oxide materials were studied with respect to their transport properties. The conductivities, oxygen ion transport numbers and oxygen permeation fluxes have been measured by using the four-probe DC, volumetric measurements of the faradaic efficiency and gas flow techniques, respectively. We show that the...
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ژورنال
عنوان ژورنال: Journal of Chemical Education
سال: 1955
ISSN: 0021-9584,1938-1328
DOI: 10.1021/ed032p342