title: Degeneration of penicillin titre in cultures of Penicillium chrysogenum.
mesh_terms: D001431:Bacteriological Techniques; D001710:Biotin / Q000494:pharmacology; D003470:Culture Media; D005838:Genotype; D008715:Methionine / Q000494:pharmacology; D009536:Niacinamide / Q000494:pharmacology; D010406:Penicillins / Q000032:analysis*; D010407:Penicillium / Q000254:growth & development*; D013831:Thiamine / Q000494:pharmacology
chemical_list: D003470:Culture Media; D010406:Penicillins; D009536:Niacinamide; D001710:Biotin; D008715:Methionine; D013831:Thiamine