Fig. 3

Recovery of E. coli from the filter paper. a Bacterial recovery from the filtration of three different volumes of M9 buffer combined with 30 ml of the E. coli culture. A, B, and C correspond to previously defined filter zones (See Fig. 2a). *. Only zones B and C of the 500 ml recovery show a significant difference of recovery (P = 0.03); b) Average recovery of E. coli from filter paper vs. the amount loaded. The error bars represent the standard deviation