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. 2009 Oct 23;5(10):e1000540. doi: 10.1371/journal.pcbi.1000540

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Mora et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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A. Rotation speed of the rotor as a function of torque for loads with different drag taken from [7]: solid curves, from top to bottom, , , , , and . The potential was chosen to be perfectly 26-fold periodic: , with . As torque increases, the rotation speed asymptotes to the behavior expected in the absence of barriers, , represented here for the case of the lowest load (dashed line). At small torques, the rotation speed is limited by the rate of barrier crossing (left inset), while at high torques the tilt makes barriers easy to cross (right inset), and rotation is only limited by drag. B. Effective diffusion coefficient as a function of torque for a load with drag coefficient : solid curves, with , , and . The real diffusion coefficient is represented by a dashed line.

Inline graphic — A. Rotation speed of the rotor as a function of torque for loads with different drag taken from [7]: solid curves, from top to bottom, , , , , and . The potential was chosen to be perfectly 26-fold periodic: , with . As torque increases, the rotation speed asymptotes to the behavior expected in the absence of barriers, , represented here for the case of the lowest load (dashed line). At small torques, the rotation speed is limited by the rate of barrier crossing (left inset), while at high torques the tilt makes barriers easy to cross (right inset), and rotation is only limited by drag. B. Effective diffusion coefficient as a function of torque for a load with drag coefficient : solid curves, with , , and . The real diffusion coefficient is represented by a dashed line.