[ON A METHOD OF VITAMIN B-12 ASSAY BY A DIFFUSION METHOD USING  ESCHERICHIA COLI 113].
D001431:Bacteriological Techniques; D001681:Biological Assay; D004058:Diffusion; D004926:Escherichia coli; D014805:Vitamin B 12; D014815:Vitamins
D014815:Vitamins; D014805:Vitamin B 12
BACTERIOLOGICAL TECHNICS; BIOLOGICAL ASSAY; ESCHERICHIA COLI; VITAMIN B 12