Shear created by a sinking particle reorients elongated bacteria, reducing non-motile encounter rates by roughly the square of the aspect ratio, while motile bacteria experience focusing or screening depending on the ratio of sinking to swimming speed.
Phaeodactylum tricornutum cells (strain CCMP2561) were cultured in f/2 medium (Guillard and Ryther 1962) mixed with artificial seawater
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Encounter rates between bacteria and small sinking particles
Shear created by a sinking particle reorients elongated bacteria, reducing non-motile encounter rates by roughly the square of the aspect ratio, while motile bacteria experience focusing or screening depending on the ratio of sinking to swimming speed.