90 BACTERIOPHAGES 



protamines that form part of the nucleoproteins of higher organ- 



TABLE IX 

 Amino Acid Analyses of Some Bacteriophages 



° Luria (1953a), results of microbiological assays expressed as per cent of 

 phage protein. 



* Hershey (1955), results for C"-labeled acid-insoluble protein by radio- 

 chemical analysis after separation on paper chromatograms, showing distribu- 

 tion of carbon as per cent of total recovered. 



'^ Poison and WyckofT (1948), separation by paper chromatography and 

 ninhydrin assay, expressed as per cent of recovered amino acids. 



^ Fraser and Terrell (1953), separation by ion exchange chromatography, 

 analysis by ninhydrin reaction expressed as per cent of recovered amino acids. 



Early analyses of the constituents of phage nucleic acids 

 yielded conflicting results. Kozloff, Knowlton, Putnam, and 

 Evans (1951) reported the isolation from phage T6 of adenine, 

 guanine, thymine, and cytosine, but the relative proportions of 

 the bases were not determined. Weed and Cohen (1951), while 



