Sentence:  Two absorptions of * * f with ethyl acetate or two <WSD>absorptions</WSD> of * * f ( which had been passed through Dowex-2-chloride ) , NS and * * f with crown gall tissue powder , or mouse liver powder did not further improve the specificity of staining . 
Meaning of the word marked with <WSD> tags:  (chemistry) a process in which one substance permeates another; a fluid permeates or is dissolved by a liquid or solid