In this embodiment {HEAD ~ the asymmetric membrane} in the form of a flat disc is mounted in {TAIL ~ a leak proof manner} against a porous collection support 
In this embodiment { HEAD ~ the asymmetric membrane } in the form of a flat disc is mounted in { TAIL ~ a leak proof manner } against a porous collection support
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH