Figure 1

Analysis of total bacterial numbers (cells/ml) in S9905 seawater in the presence of 0.1 nM (FIG 1A) or 1000 nM (FIG 1B) of siderophore DEF siderophore DEF, synthetic HSLs, DEF plus HSL respectively with DAPI staining counting method during 7 days incubation at 30°C. (filled circle) without addition; (circle) with the addition of 0.1 nM DEF, (triangle) with the addition of 0.1 nM 3OC6-HSL, (filled triangle) with the addition of 0.1 nM DEF plus 0.1 nM 3OC6-HSL (Fig 1A), (square) with the addition of 0.1 nM C8-HSL (Fig 1B), (filled square) with the addition of 0.1 nM DEF plus 0.1 nM C8-HSL. Each points represents the mean coaggregration value from three separate measurements.