360 



MAHLON B. HOAGLAND 



TABLE III 

 Base Composition of Soluble and Ribosomal RNA 



* Two RNA fractions produced in presence of chloramphenicol. 



References 



a P. F. Spahr, and A. Tissieres, J. Mot. Biol., 1, 237 (1959). 



b P. Berg, unpublished data. (1959). 



c E. T. Bolton, Carnegie Inst. Wash. Yearbook 1958, p. 275. 



" R. Monier, M. L. Stephenson, P. C. Zamecnik, Biochim. et Biophys. Acta in press (1960). 



e B. Magasanik, in "The Nucleic Acids" (E. Chargaff and G. N. Davidson, eds.), Vol. I, p. 373. Academic 

 Press, New York, 1955. 



' D. A. Goldthwaite, J. Biol. Chem. 234, 3245 (1959). 



9 R. S. Schweet, unpublished data. (1959). 



h W. C. Gillchriest and R. M. Bock, in "Microsomal Particles and Protein Synthesis" (R. B. Roberts, ed.), 

 p. 7. Pergamon Press, London, 1958. 



* J. F. Scott, unpublished data. (1959). 



ribosomal protein by fractionation on DEAE of urea-treated particles. 

 Harris, 52 on the other hand, has obtained evidence, using different tech- 

 niques, suggesting that the protein may be more uniform. 



The base composition of particle RNA from mammalian tissues has been 

 studied (cf. Magasanik 53 and Table III). It shows the usual high guanine 



52 I. Harris, personal communication (1960). 



53 B. Magasanik, in "The Nucleic Acids" (E. Chargaff and J. N. Davidson, eds.), 

 Vol. I, p. 373. Academic Press, New York, 1955. 



