32. THE NUCLEIC ACIDS OF MICROORGANISMS 



169 



TABLE III 



DNA Composition of Bacteria (Gram-Positive Bacilli) 



Species 



Corynebacterium parvum 

 Mycobacterium (Corynebacterium) vado- 



sitm Kras. 

 Corynebacterium diphtheriae 

 Corxjnebacterium diphtheriae 

 Corynebacterium acnes 

 Lactobacillus bifidus 

 Bacillus subtilis 

 Bacillus megaterium 

 Bacillus thuringiensis amer. 

 Bacillus cereus As 6 

 Bacillus cereus alesti 

 Bacillus cereus alesti (mutant) 

 Bacillus cereus alesti (mutant) 

 Bacillus cereus p 1 

 Bacillus cereus p 2 

 Bacillus cereus ATCC 12137 

 Bacillus cereus BTCC 7587 

 Bacillus cereus (not irradiated) 

 Bacillus cereus (irradiated) 

 Clostridium bifermentans 

 Clostridium valerianicum 

 Clostridium saprogenes 

 Ramibacterium ramosum 

 Clostridium perfringens (var. Fred) 

 Clostridium perfringens 



* In this case a strong deficit of guanine is observed. 



References 

 ° Ki Yong Lee el al., Ann. inst. Pasteur 91, 212 (1956). 

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

 c J. H. Stuy, J. Bacterial. 76, 179 (1958). 

 d J. H. Stuy, J. Bacterial. 76, 668 (1958). 



ences in the DNA composition in different bacteria from the viewpoint of 

 their systematics and phylogeny seems to be most promising. 



As a comparison with the Bergey classification 150 will show, representa- 

 tives of at least 13 families have been examined so far. The families most 

 widely studied with respect to their specific composition are: Micrococca- 

 ceae, Brucellaceae and Bacteroidaceae (Parvobacteriaceae), Enterobac- 

 teriaceae, and Bacillaceae. 



150 "Bergey 's Manual of Determinative Bacteriology," 7th ed. Williams & Wilkins, 

 Baltimore, 1957. 



