Brownian search for targets hidden in cusp-like pockets: Progress and Applications
We report here recent progress in computing the search time for a stochastic particle to find a small target hidden in cusp-like pockets. The target is a small segment in dimension two, a small hole or a narrow ribbon in dimension three, placed at the end of a cusp. The asymptotic analysis of the di...
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Veröffentlicht in: | The European physical journal. ST, Special topics Special topics, 2014-12, Vol.223 (14), p.3273-3285 |
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description | We report here recent progress in computing the search time for a stochastic particle to find a small target hidden in cusp-like pockets. The target is a small segment in dimension two, a small hole or a narrow ribbon in dimension three, placed at the end of a cusp. The asymptotic analysis of the diffusion equation reveals the role of the local geometry, and a mathematical difficulty comes from the boundary layer near the target. The methods are conformal mapping and matching asymptotic. We present applications in cell biology where cellular activation occurs when a diffusing particle finds a hidden site. This is the case during vesicular fusion initiated after a protein located between the vesicular and cell membranes binds to several diffusing calcium ions. Another example is a drug activation site located inside a deep molecular pocket. The analytical formulas clarify the role of small parameters. |
doi_str_mv | 10.1140/epjst/e2014-02332-6 |
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subjects | Atomic Brownian Motion in Confined Geometries. Guest Editors: S.M. Bezrukov Classical and Continuum Physics Condensed Matter Physics L. Schimansky-Geier and G. Schmid (Eds.) Materials Science Mathematics Measurement Science and Instrumentation Molecular Optical and Plasma Physics Physics Physics and Astronomy Regular Article |
title | Brownian search for targets hidden in cusp-like pockets: Progress and Applications |
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