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