title: An inexpensive apparatus for making precise, continuous, complex gradients for column chromatography.
mesh_terms: D002848:Chromatography, DEAE-Cellulose / Q000295:instrumentation*; D006801:Humans; D007456:Iodine Isotopes; D008722:Methods; D013972:Thyrotropin / Q000302:isolation & purification
chemical_list: D007456:Iodine Isotopes; D013972:Thyrotropin