It may further be used as {HEAD ~ a support material} in {TAIL ~ chromatographic materials} or catalytically active materials 
in
It may further be used as { HEAD ~ a support material } in { TAIL ~ chromatographic materials } or catalytically active materials
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH