Bioconvection

Convection isn’t always driven by temperature. Here, researchers explore the convective patterns formed by Thiovulum bacteria. These bacteria are negatively buoyant, meaning they will sink if they aren’t swimming. They also have an asymmetric moment of inertia, so any flow moving past them tends to affect their swimming direction.

When let loose in a Hele-Shaw cell with a oxygen levels that decrease with depth, the bacteria create complex convection-like patterns. They swim slowly upward in wide, slow plumes and sink in denser, narrow plumes. In other areas, they form large-scale rotating vortices. (Video and image credit: O. Kodio et al.)

#2025gofm #bioconvection #biology #convection #flowVisualization #fluidDynamics #physics #science

this is likely #bioconvection - upswimming of the motile organisms due to combination of light and negative gravitaxis, followed by sinking when the layer becomes too dense https://www.jstor.org/stable/pdf/43421291.pdf
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RT @Eudorina_ch
ゴニウムのこれはどんな反応によるものなんだろうか？
振動が原因？
大きさ的にある程度数が増えてこないと観察が難しい現象 https://t.co/8SSniydktV
https://twitter.com/Eudorina_ch/status/1604756971760291840