Methylobacterium populi VP2: Plant Growth-Promoting Bacterium Isolated from a Highly Polluted Environment for Polycyclic Aromatic Hydrocarbon (PAH) Biodegradation

Figure 2

Analysis of the Methylobacterium populi VP2 biofilm that formed on LVP/PHE. The sample was collected after 96 h of growth in M9/MeOH liquid broth supplemented with LVP-dissolved phenanthrene. (a): the top phase represents LVP-phenanthrene embedded in a large amount of extracellular polymeric matrix harvested at the end of the growth. (b): the top phase represents LVP-phenanthrene released after freeze-thawing and separation of the phases by centrifugation; the extracellular matrix (collapsed biofilm) forms a disk between the organic phase (top) and water phase (bottom).