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Forces in inhomogeneous open active-particle systems
Nitzan Razin, Raphael Voituriez, Jens Elgeti +1
We study the force that non-interacting point-like active particles apply to a symmetric inert object in the presence of a gradient of activity and particle sources and sinks. We c…
Human sperm steer with second harmonics of the flagellar beat
Guglielmo Saggiorato, Luis Alvarez, Jan F. Jikeli +3
Sperm are propelled by bending waves travelling along the flagellum. During steering in gradients of sensory cues, sperm adjust the flagellar beat waveform. Symmetric and asymmetri…
Generalized Archimedes' principle in active fluids
Nitzan Razin, Raphael Voituriez, Jens Elgeti +1
We show how a gradient in the motility properties of non-interacting point-like active particles can cause a pressure gradient that pushes a large inert object. We calculate the fo…