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SUMMARY: Optimal conditions for the adsorption of bacteriophage λ22 by Escherichia coli strain K112 require 0·02 m-MgSO4 and a pH value of the order 6·5. With a multiplicity of input of 20 phage particles per bacterium, 99 % of the bacteria are infected and at least 90 % are lysogenized. Irradiation of the cells with ultraviolet light immediately prior to infection causes them to give the lytic rather than the lysogenic response.
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