176 



BACTERIOPHAGES 



forming potential of the infected bacterium, the survival should 

 be given by the expression 



;; = 1 - (1 



■kD\n 



Such theoretical survival curves for bacteria containing various 

 numbers of phage particles are given in Figure 5, taken from the 

 paper of Luria and Latarjet (1947). 



.7 

 .5 



.3 

 .2 



"5 



> 



E .1 



W 



.07 

 .05 



.03 

 .02 



•°' 123456789 



dose 



Figure 5. The relation between dose of irradiation and survival of infected 

 bacteria according to the target theory. The numbers on the curves corre- 

 spond to different numbers of identical targets per bacterium. Reproduced 

 from S. E. Luria and R. Latarjet, 1947, J. BacterioL, 53, 149, with permission. 



