180 



A. N. BELOZERSKY AND A. S. SPIRIN 



TABLE XI 

 RNA Composition of Algae and Protozoa 



References 



° G. P. Serenkov and M. V. Pakhomova, Doklady Vyschej Schkoly No. 4, p. 156 (1959). 

 h G. Brawerman and E. Chargaff, Biochim. et Biophys. Acta 31, 172 (1959). 

 c O. Scherbaum, Exptl. Cell. Research 13, 24 (1957). 



may consider their RNA composition to be identical with that of P. vulgaris, 

 A. aerogenes, Alcaligenes faecalis, and Pseudomonas aeruginosa. Quite a 

 distinct difference from this group of organisms having an identical RNA 

 composition is shown, on the one hand, by C. pcrfringens, S. aureus, and 

 Pasteurella lularensis [(G + C)/(A + U) = 1.06 and less], and, on the other 

 hand, by M . tuberculosis, S. lutea, and Streptomyces streptomycini [(G + C)/ 

 (A + U) = 1.3 and more]. 146 If, therefore, RNA also shows some specificity 

 of composition, it is not impossible that this may likewise be useful for the 

 phylogenetic classification of bacteria; this time for larger systematic groups 

 than in the case of DNA. 



From the data on the RNA of fungi (Table X) and of algae (Table XI), 

 it follows that their RNA composition, as that of the bacteria, shows little, 

 if any, variations. 



The comparison of these data with the results of the RNA analyses in 

 bacteria (Tables VIII and IX), shows that the RNA composition in the 

 whole group of microorganisms does not reveal considerable differences and 



