Fig. 3. A, B: Large, plate-like biofilms forming three-dimensional structures around a large cavity and taking up much of the magnet surface (×1000, ×5000). The surface of the platelike biofilms appeared smooth. C, D: Plate-like biofilms were cracked or scattered, and many biofilm clusters of various sizes were observed. Complex tower-like three-dimensional structures were observed in the cracks (×1000, ×5000). The region in the white box is magnified from A to B and from C to D.
