168 



A. N. BELOZERSKY AND A. S. SPIRIN 



TABLE II 

 DNA Composition of Bacteria (Enterobacteriaceae) 



Species 



Base proportions 

 (moles %) 



A + T 



Serratia marcescens 



Serratia marcescens 



Aerobacter aerogenes 



Aerobacter aerogenes 



Aerobacter aerogenes (normal) 



Aerobacter aerogenes (streptomycin resist- 

 ant) 



Aerobacter aerogenes 



Aerobacter aerogenes 



Erwinia carotovora 



Salmonella typhimurium 



Salmonella typhimurium 



Salmonella typhosa 



Salmonella gallinarum 



Salmonella paratyphi A 



Salmonella enteritidis 



Salmonella enteritidis (resistant to D 4 

 phage) 



Shigella dysenteriae 



Shigella paradysenteriae Flexner Y6 R0 



Shigella paradysenteriae Flexner Y6 R4 



Proteus morganii 



Escherichia coli (B/r) 



Escherichia coli K12 



Escherichia coli UQ 



Escherichia coli (thymineless) 



Escherichia coli SM 



Escherichia coli I 



Escherichia coli W 



Escherichia coli W 



Escherichia coli (B/r) 



Escherichia coli (15T~) 



Proteus vulgaris 



Proteus vulgaris 



* The sum of the four bases given does not equal 100; the missing mole % consist of 6-methylaminopurine. 



References 

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 b Ki Yong Lee et al., Ann. inst. Pasteur 91, 212 (1956). 

 c A. S. Spirin et al., Biokhimiya 22, 744 (1957). 

 d A. S. Jones et al., J. Gen. Microbiol. 17, 586 (1957). 

 e D. B. Dunn and J. D. Smith, Biochem. J. 68, 627 (1958). 

 ' J. D. Smith and G. R. Wyatt, Biochem. J. 49, 144 (1951). 

 o B. Gandelman et al, Biochim. et Biophys. Acta 9, 399 (1952). 

 h A. S. Spirin and A. N. Belozersky, Biokhimiya 21, 768 (1956). 

 »' E. Chargaff et al., Nature 180, 851 (1957). 



