منابع مشابه
Tracer and Nontracer Potassium Fluxes
The efflux of labeled and unlabeled potassium ions from the squid giant axon has been measured under a variety of experimental conditions. Axons soaked in sea water containing K ions lost radioactivity when placed in inactive sea water according to kinetics which indicate the presence of at least two cellular compartments. A rapidly equilibrating superficial compartment, probably the Schwann ce...
متن کاملQuinidine and unidirectional cation fluxes in atria.
The effect of quinidine on unidirectional fluxes of Na and K in isolated rabbit atria has been investigated and correlated with known effects of the drug on the electrical and mechanical properties of the heart. Quinidine caused a rapid inhibition of J\a entry, which secondarily depressed K efflux. In addition, the drug depressed membrane permeability to K and caused a marked inhibition of acti...
متن کاملAuxin-driven patterning with unidirectional fluxes
The plant hormone auxin plays an essential role in the patterning of plant structures. Biological hypotheses supported by computational models suggest that auxin may fulfil this role by regulating its own transport, but the plausibility of previously proposed models has been questioned. We applied the notion of unidirectional fluxes and the formalism of Petri nets to show that the key modes of ...
متن کاملBrownian simulations and unidirectional flux in diffusion.
The prediction of ionic currents in protein channels of biological membranes is one of the central problems of computational molecular biophysics. Existing continuum descriptions of ionic permeation fail to capture the rich phenomenology of the permeation process, so it is therefore necessary to resort to particle simulations. Brownian dynamics (BD) simulations require the connection of a small...
متن کاملTracer diffusion in active suspensions.
We study the diffusion of a Brownian probe particle of size R in a dilute dispersion of active Brownian particles of size a, characteristic swim speed U_{0}, reorientation time τ_{R}, and mechanical energy k_{s}T_{s}=ζ_{a}U_{0}^{2}τ_{R}/6, where ζ_{a} is the Stokes drag coefficient of a swimmer. The probe has a thermal diffusivity D_{P}=k_{B}T/ζ_{P}, where k_{B}T is the thermal energy of the so...
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ژورنال
عنوان ژورنال: Biophysical Journal
سال: 1967
ISSN: 0006-3495
DOI: 10.1016/s0006-3495(67)86627-x