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Characterization of flow velocity and biofilm clusters in two contrasting hydrodynamic microenvironments.A. Frequency distributions of three-dimensional flow velocity (x, y and z axes) as determined by Acoustic Doppler Velocimetry at the crest and in the trough of graded bedforms.B. Microphotographs of biofilm clusters at day 1 and at day 13 at the crest and in the trough.C. Growth patterns of biofilm clusters at the crest and in the trough of graded bedforms.
