Critical Exponents in Cytosolic Diffusion
نویسنده
چکیده
The interior of a cell is very crowded (up to 35% protein by weight), with significant consequences for diffusive transport. The possible trajectories of a given tracer particle are constrained by the labyrinth of obstacles. For a static obstacle configuration, a percolation transition takes place at a certain critical obstacle density, so that above this density no long-range transport is possible. A scaling relation links the critical exponent μ for the vanishing of the diffusion coefficient at this transition to the exponent ν for divergence of the correlation length and the exponent α characterizing subdiffusive transport on scales ξ. Here I derive this relation, and compare it to data from simulation and experiment.
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