Fig. 2. Filament formation and lysis of E. coli MG1655 WT (a) and mutants deficient in arabinose metabolism (ΔaraC) (b) or glucose metabolism (Δglc) (c) were treated with carbenicillin alone or in combination with 12 mM l-arabinose or 10 mM d-glucose. Untreated controls were included. Cells were analysed by light microscopy (upper panel) and flow cytometry (lower panel) after 18 h of treatment. Flow cytometry results are shown as FSC-A, indicating cell size, versus SSC-A, indicating surface granularity. Scale bar 10 microns.