1. Voltage laws for three-dimensional microdomains with cusp-shaped funnels derived from Poisson-Nernst-Planck equations
- Author
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Cartailler, J. and Holcman, D.
- Subjects
Mathematics - Analysis of PDEs ,Quantitative Biology - Subcellular Processes ,Biological Physics (physics.bio-ph) ,Quantitative Biology - Neurons and Cognition ,FOS: Biological sciences ,FOS: Mathematics ,FOS: Physical sciences ,Neurons and Cognition (q-bio.NC) ,Physics - Biological Physics ,Subcellular Processes (q-bio.SC) ,Analysis of PDEs (math.AP) ,35J66, 35B44, 35B25, 92C05, 92C37 - Abstract
We study the electro-diffusion properties of a domain containing a cusp-shaped structure in three dimensions when one ionic specie is dominant. The mathematical problem consists in solving the steady-state Poisson-Nernst-Planck (PNP) equation with an integral constraint for the number of charges. A non-homogeneous Neumann boundary condition is imposed on the boundary. We construct an asymptotic approximation for certain singular limits that agree with numerical simulations. Finally, we analyse the consequences of non-homogeneous surface charge density. We conclude that the geometry of cusp-shaped domains influences the voltage profile, specifically inside the cusp structure. The main results are summarized in the form of new three-dimensional electrostatic laws for non-electroneutral electrolytes. We discuss applications to dendritic spines in neuroscience., Comment: 28 pages, 6 figures
- Published
- 2017
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