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. Author manuscript; available in PMC: 2015 Nov 18.
Published in final edited form as: Annu Rev Fluid Mech. 2015 Jan 1;47:343–375. doi: 10.1146/annurev-fluid-010313-141426

FIG. 9.

FIG. 9

Probability distribution functions (PDFs) for tracer displacements in suspensions of Chlamydomonas. (a) PDFs at a fixed time interval Δt = 0.12 s, at various volume fractions ϕ. The Gaussian develops apparently exponential tails as ϕ increases. (b) Diffusive rescaling of PDFs at ϕ = 2.2% for several time intervals (Δt), leading to data collapse to a non-Gaussian function. Figure adapted with permission from Leptos et al. (2009). Copyright 2009 by the American Physical Society.