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. 2015 Mar 17;5:9190. doi: 10.1038/srep09190

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(a) Curvature of the flagella at the start of the power stroke in Newtonian (μ = 6 mPa·s) and polymeric fluid (De = 6.5 and μ = 5.7 mPa·s). Panels (b, c) Mean curvature profiles averaged over the power (blue) stroke, recovery (red) stroke and full beat cycle (black) for the same fluids. (b) Newtonian fluid, and (c) Polymeric fluid. Panel (d) instantaneous speed as a function of time scaled with the period, t/T for swimming in two Newtonian fluids - moderate viscosity 2.6 mPa·s (black, circles) and high viscosity 6 mPa·s (blue, squares). (e) Instantaneous speed in a viscoelastic fluid corresponding to De = 6.5 and μ = 5.7 mPa·s (red, circles) and a Newtonian fluid of viscosity μ = 6 mPa·s (blue, squares).