Green Photosynthetic Flames

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A dense culture of the photosynthetic and phototactic protozoan Euglena gracilis. The macroscopic patterns (the green flames, dots, curves) are a spatio-temporal pattern called bioconvection which forms when an external stimulus such as light, an oxygen gradient, or gavity induces unidirectional swimming of the microorganism. A timelapse and some stills.

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