Fig. 2: Biofilm growth and streamer development.
From: The role of fluid friction in streamer formation and biofilm growth

Case 1, corresponding to τw = 0.068 Pa. The flow direction is from left to right. Frame a shows changes in biofilm height h over one week, where individual biofilm structures grow progressively, and new structures emerge. Frame b focuses on streamer development. Region 1 and 2 correspond to the red and orange rectangles in (a), respectively. Streamer formation begins on the second day, with the boxes tracing the development of a representative streamer in each region.