Re: a radiometric microbiologic assay for the biologically active forms of niacin.
D008828:Microbiological Techniques; D009539:Nicotinic Acids / Q000032:analysis / Q000378:metabolism*; D011874:Radiometry / Q000379:methods; D013769:Tetrahymena pyriformis / Q000378:metabolism*
D009539:Nicotinic Acids