Table 2.

Characteristics of phages with S and E lysis functions

Phage	Burst† (p.f.u. per cell)	Trapped‡ (%)	EOP§	Plaque size||
λS	125	–	1.19 (±0.16)	1.00 (±13 %)
λ*E	143	7	0.70 (±0.13)	0.32 (±38 %)
λEpos	112	7	0.67 (±0.08)	0.33 (±33 %)
λ*Epos	44	11	1.06 (±0.23)	0.45 (±24 %)

^†Calculated average burst size per induced lysogenic cell; >1000 plaques were counted in each case.

^‡Fraction of p.f.u. retained in sedimentable cells and released by mechanical cell disruption.

^§Relative efficiency of plating, as calculated from titre on non-complementing lawn divided by titre on complementing lawn.

^||Average plaque size, relative to λS (=2.25 mm), and standard deviation, based on measuring 100, 198, 220 and 64 plaques for λS, λ*E, λEpos, and λ*Epos, respectively, as a percentage of the average diameter.