title: Second-derivative spectroscopy of proteins: studies on tyrosyl residues.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D010649:Phenylalanine / Q000031:analogs & derivatives / Q000032:analysis; D011506:Proteins / Q000032:analysis*; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*; D014364:Tryptophan / Q000031:analogs & derivatives / Q000032:analysis; D014443:Tyrosine / Q000031:analogs & derivatives / Q000032:analysis*
chemical_list: D011506:Proteins; C019142:N-acetyltyrosylamide; C026868:N-acetylphenylalanine ethyl ester; C016952:N-acetyltryptophanamide; D014443:Tyrosine; D010649:Phenylalanine; D014364:Tryptophan