title: Biological polymers related to catechol: electron paramagnetic resonance and infrared studies of melanin, tannin, lignin, humic acid and hydroxyquinones.
mesh_terms: D000818:Animals; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004578:Electron Spin Resonance Spectroscopy; D006812:Humic Substances; D066298:In Vitro Techniques; D007259:Infrared Rays; D008031:Lignin; D008543:Melanins; D008974:Mollusca; D010944:Plants; D011809:Quinones; D013053:Spectrophotometry; D013634:Tannins
chemical_list: D006812:Humic Substances; D008543:Melanins; D011809:Quinones; D013634:Tannins; D008031:Lignin