Hierarchical structure of spatially localized bioconvection of photosensitive microorganism

Abstract eng:
It is known that the suspension of Euglena gracilis exhibits macroscopic spatially localized patterns when it is illuminated from below with strong light. Such structure is hierarchical ranging from µm scale of microorganism to cm scale of the convection cells. We discuss the localization mechanism in terms of the photosensitive behavior of Euglena gracilis in both scales. Individual’s response to light gradient is analyzed experimentally, and the result is related to the flux of the number density in macroscopic scale to construct a hydrodynamic model. The model has spatially localized steady solutions, and the bifurcation structure has a bistable region, which often observed in spatially localized structures in dissipative systems.

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