Sentence:  After dialysis the sample was centrifuged and the supernatant placed on a * * f cm <WSD>column</WSD> of DEAE-cellulose equilibrated with starting buffer . 
Meaning of the word marked with <WSD> tags:  a vertical glass tube used in column chromatography; a mixture is poured in the top and washed through a stationary substance where components of the mixture are adsorbed selectively to form colored bands