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