Hold the line, please tournament levaquin 250 mg tablet protect bike What the scientists found was that the P. aeruginosa biofilms grown in space contained more cells, more mass and were thicker than the control biofilms grown on Earth. When they viewed the microscopy images of the space-grown biofilms, the researchers saw a unique, previously unobserved structure consisting of a dense mat-like "canopy" structure supported above the membrane by "columns." The Earth grown biofilms were uniformly dense, flat structures. These results provide the first evidence that spaceflight affects community-level behavior of bacteria.