Figure 1. SEM imaging and X-ray analysis of pipeline cookie biofilms. (A) Hydrocarbon exposed surfaces of pipeline cookie L were imaged using a field emission scanning electron microscope (FE-SEM) at magnifications 2,500 ×, 5,000 ×, and 7,500 × (left to right panels, respectively). Note the microorganisms which are visibly embedded in surface deposits (indicated by arrows in rightmost panel). .