Sentence:  Paper electrophoresis was carried out on the concentrated samples in a Spinco model R cell <WSD>using</WSD> barbital buffer , pH 8.6 , ionic strength 0.075 , at room temperature on Whatman 3 MM filter paper . 
Meaning of the word marked with <WSD> tags:  put into service; make work or employ for a particular purpose or for its inherent or natural purpose