Aggregate visualized by SEM.

<p>Aggregates from a post-exponential 8325-4 culture were fixed and visualized using Scanning Electron Microscopy (SEM). Panels A-D represent increasing magnification and red squares indicate the area magnified in the following panel. Overview of an aggregate, which is visible to the naked eye (A). Zooming in reveals pores and crevices in a topographical landscape of aggregated clusters (B). At higher magnifications it is revealed that some clusters are embedded in a web-like matrix (black arrows) while some are not (white arrows) (C, D).