Listar por autoría "ca2bf6d5-4233-4883-8c5b-b852cde7c17a"
Mostrando ítems 1-10 de 10
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Diffusion, exclusion, and specific binding in a large channel: A study of OmpF selectivity inversion
Alcaraz, Antonio; Nestorovich E.M.; López Peris, María Lidón; García Giménez, Elena; Bezrukov S.M.; Aguilella, Vicente Elsevier (2009)We find that moderate cationic selectivity of the general bacterial porin OmpF in sodium and potassium chloride solutions is inversed to anionic selectivity in concentrated solutions of barium, calcium, nickel, and magnesium ... -
Effect of annealing on the permeation characteristics of gases of coextruded LLDPE films
Compañ, Vicente; Andrio, Andreu; López Peris, María Lidón; Riande, Evaristo Elsevier (1996)The temperature dependence of both the permeability and diffusion coefficients of carbon dioxide, oxygen and nitrogen in annealed LLDPE films are studied. It is found that the values of the permeability coefficient through ... -
Excess white noise to probe transport mechanisms in a membrane channel
Queralt-Martín, María; López Peris, María Lidón; Alcaraz, Antonio American Physical Society (2015)Current fluctuation analysis has been successfully used over the years to investigate the physical properties of different systems. Here, we perform single-channel time-resolved current experiments in a protein channel ... -
Experimental demonstration of charge inversion in a protein channel in the presence of monovalent cations
López Peris, María Lidón; Queralt-Martín, María; Alcaraz, Antonio Elsevier (2014-11)Charge inversion takes place when interfacial charges attract counterions in excess of their own nominal charge. To date, this phenomenon has been reported in a variety of membrane channel systems in the presence of ... -
Ion selectivity of a biological channel at high concentration ratio: insights on small ion diffusion and binding
López Peris, María Lidón; Aguilella-Arzo, Marcel; Aguilella, Vicente; Alcaraz, Antonio American Chemical Society (2009)The ionic selectivity of the bacterial porin OmpF has been investigated in several chloride salts of alkali metal cations under a wide range of concentration ratios. We report a novel way of studying the several factors ... -
Ion Transport in Confined Geometries below the Nanoscale: Access Resistance Dominates Protein Channel Conductance in Diluted Solutions
Alcaraz, Antonio; López Peris, María Lidón; Queralt-Martín, María; Aguilella, Vicente (2017)Synthetic nanopores and mesoscopic protein channels have common traits like the importance of electrostatic interactions between the permeating ions and the nanochannel. Ion transport at the nanoscale occurs under confinement ... -
Linearity, saturation and blocking in a large multiionic channel: divalent cation modulation of the OmpF porin conductance
García Giménez, Elena; López Peris, María Lidón; Aguilella, Vicente; Alcaraz, Antonio Elsevier (2011-01)Measurement of unitary conductance is a fundamental step in the characterization of a protein ion channelpermeabilizing a membrane. We study here the effect of salts of divalent cations on the OmpF channelconductance ... -
Mechanical relaxations and diffusive changes in linear low density polyethylene (LLDPE) films subject to induced stretching
Compañ, Vicente; Díaz-Calleja, R.; Ribes, A.; Andrio, Andreu; López Peris, María Lidón; Riande, Evaristo Wiley (1996)An analysis of the diffusion of oxygen and carbon dioxide through linear low density polyethylene (LLDPE) subjected to longitudinal and transversal induced stretching in the ratio 2:1, is presented in this paper. The ... -
Scaling Behavior of Ionic Transport in Membrane Nanochannels
Queralt-Martín, María; López Peris, María Lidón; Aguilella-Arzo, Marcel; Aguilella, Vicente; Alcaraz, Antonio American Chemical Society (2018)Ionic conductance in membrane channels exhibits a power-law dependence on electrolyte concentration (G ∼ c α ). The many scaling exponents, α, reported in the literature usually require detailed interpretations ... -
Stochastic pumping of ions based on colored noise in bacterial channels under acidic stress
López Peris, María Lidón; Queralt-Martín, María; Alcaraz, Antonio Royal Society of Chemistry (2016-06)Fluctuation-driven ion transport can be obtained in bacterial channels with the aid of different types of colored noise including the biologically relevant Lorentzian one. Using the electrochemical rectification of the ...