Figure 3.

SEM analysis of mixed biofilms. Biofilms inhibited by zinc show thick pili (A, C) that are not visualized in biofilms insensible to zinc (B,D). Pili are seen mediating cell-to-cell interaction and adhesion to surface (white arrows). Fimbrial structures resembling curli can be observed in some samples (black arrows).

Mansan-Almeida et al. BMC Microbiology 2013 13:22   doi:10.1186/1471-2180-13-22
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