206 



PROVASOLI 



[CHAP. 8 



Table 

 Quantity of Vitamin Bi2-Like 



Locality and type of water 



Assay organism 



Method 



Vineyard Sound, Woods 



Hole (coastal) 

 Northwest Arm, Halifax, 



N.S. (coastal, polluted) 

 Pier at Millport, Scotland 



(coastal) 

 Aberdeen Bay, Scotland 



(coastal) 

 Northern North Sea 



Butt of Lewis 



Norwegian Deeps 



Bay of Biscay 



12 stations 0-30°N along 

 130°E (North Pacific) 



Euglena gracilis a 



Stichococcus sp.& 



Monochrysis lutheri c 



Lactobacillus leich mannii d 

 Ochromonas malhamensis e 

 L. leichmannii and O. malha- 



mensisf 

 L. leichmannii and O. malha- 

 mensis 

 L. leichmannii and 0. malha- 

 mensis 

 Euglena gracilis a 



Euglena gracilis a 



Dialysis of S\Y. 

 Direct measurement 

 Direct measurement 

 Phenol extract, of SW. 

 Phenol extract, of SW. 

 Phenol extract, of SW. 

 Phenol extract, of SW. 

 Direct on diluted SW. 

 Dialysis of SW. 



Kagoshima Bay (variations 

 in depth and diurnal) 



Euglena gracilis a 



Dialysis of SW. 



Bahia Fosforescente 

 (Puerto Rico) 



Long Island Sound 

 (coastal) 



Escherichia coli g 

 Thraustochytrium globosum fl 



Phenol extract, of SW. 

 Direct measurement 



a Responds to true B12, pseudo-Bi2 and factors A, C, C2. 



b The specificity of Stichococcus toward various cobalamins is unknown. 



c Responds to true B12, pseudo-Bi2 and factors A, I and H. 



d Responds to true B12, pseudo-Bi2, factors A, I and also desoxy ribosides. 



e Responds only to true B12 and factor I. 



