Abstract
This paper is associated with a video winner of a 2020 American Physical Society's Division of Fluid Dynamics (DFD) Milton van Dyke Award for work presented at the DFD Gallery of Fluid Motion. The original video is available online at the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2020.GFM.V0020.
Highlights
Fluid flows play a vital role in the transport and organization of living systems [1]
The extreme but finite viscosity inhibits undesired thermal convection and allows microorganisms to effectively live at the air-liquid interface due to capillary forces
The resulting colony expansion is monitored from the top over several days with an incubated Zeiss Lumar.V12 stereoscope
Summary
Fluid flows play a vital role in the transport and organization of living systems [1]. We grew microbial populations on the surface of a nutrient-rich fluid 104–105 times more viscous than water. The viscosity of the fluid is controlled by adding 2-hydroxyethyl cellulose, a long chain polymer, to yeast extract, peptone, and dextrose (glucose) microbial growth medium.
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