Some Nutritional Relationships Among Microbes 



141 



BIOTIN 



THIAMINE 



3 



O 



a. 



CO 



u. 



o 



^oL^asL. 



RIBOFLAVc 



GROWTH-B 739 



/ 



ODOO^ 



d 



3 I 



X 



=^ 



o 



I cr 



o 



6 12 18 24 6 12 18 24^ 



TIME AFTER I NOCULATION - HRS 



Fig. 2. Production and excretion of B vitamins by culture R739 obtained 

 from Long Island Sound. 



