Figure 1

Development of bacteriophages λ (strain λ papa), P1 (strain P1vir) and T4 (strain T4D) in cultures of E. coli MG1655 growing in FB medium supplemented with 0.2% glucose (open squares) or devoid of the carbon source (closed squares). In the latter case, glucose was removed from the medium at the time indicated by the first arrow. The second arrow indicates the time of addition of glucose to the culture to final concentration of 0.2%. Bacteria were infected with phages at m.o.i (multiplicity of infection) of 0.001. Samples of cultures were withdrawn at indicated times and number of phages (plaque forming units, pfu) per ml of the culture was estimated by titration.