GROWTH FACTORS 



Table 8 {Concluded) 



121 



It has been claimed that ascorbic acid is required 

 as a growth factor by the trypanosomes Schizotrypanum 

 cruzi, LeisJirminia tropica and L. donovani and some 

 Trichomonas species. Cholesterol is also said to be 

 required by some species of Trichomonas. 



For further reading : — 



K. Hofmann, " The Chemistry and Biochemistry of Biotin." Advances in 



Enzymology. 3 (1943), 289. 

 B. C. J. G. Knight, " Growth Factors in Microbiology." Vitamins and 



Hormones. 3 (1945), 108. 

 S. A. Koser and F. Saunders, " Accessory Growth Factors for Bacteria and 



Related Micro-organisms." Bad. ^Rev. 2 (1938), 99. 

 A. L^voff, " Les Facteurs de Croissance pour les Micro-organismes." Ann. 



Inst. Pasteur. 61 (1938), 580. 

 W. H. Peterson and M. 8. Peterson, " Tlie Relation of Bacteria to Vitamin.s 



and other Growth Factors." Bad. Rev. 9 (1945), 49. 

 R. J. Williams, " The Chemistry and Biochennstrv of Pantothenic Acid." 



Advances in Enzymology. 3 (1943), 253. 



