208 



A. GAREN AND L. M. KOZLOFP 



C. Properties of the Components of Phage T2 



1. Attachment to Bacteria 



Several of the components of T2 have been tested for their capacity to 

 attach to sensitive bacteria (Table I). Attachment was determined by centri- 

 fuging mixtures of the component and host bacteria, at speeds sufficient to 



INTERNAL 

 CONSTITUENTS 



lOOOA 



HEAD COAT 



TAIL SHEATH 



TAIL CORE 



TAIL FIBERS 



Fig. 5. Model of T2. 



TABLE I 

 Capacities of Components of T2 to Attach to Sensitive Bacteria 



Component 



Attachment to 

 sensitive cells 



Intact phage 

 Ghosts « 

 DNA« 

 Heads ^ 



Complete tails * 

 Free tail fibers * 

 Free tail rods " 



+ 

 + 

 

 



+ 



+ 

 (+0) 



+ indicates attachment and lack of attachment. 



<» Hershey and Chase, 1952. 



^ Williams and Fraser, 1956. 



" Kellenberger and Sechaud, 1957. Appears to consist of two fractions, only one of 

 which attaches. The attaching fraction contains rods that have retained fibers (see 

 Figs. 2, 7); the rods of the nonattaching fraction may have lost their fibers. 



