They are semipermeable and useful in the separation of {TAIL ~ different chemical species} by osmosis, dialysis, electrodialysis and {HEAD ~ reverse osmosis} 
They are semipermeable and useful in the separation of { TAIL ~ different chemical species } by osmosis , dialysis , electrodialysis and { HEAD ~ reverse osmosis }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD