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