Selectively Permeable Membrane
Based Chemical/Biological Protective Field Duty Uniform -- Quoc Truong, Eugene Wilusz
A permeable membrane
, such as Mypex, is best of all as the water gets through, but the light doesn't.
Worms can also migrate into the bile ducts and the permeable membrane
that covers the abdominal organs.
Their technique is based on the process of osmosis - the natural movement of water from a region with low solute concentration across a permeable membrane
to a region with high concentration.
Preparing the site Remove all turf, cover the ground with a permeable membrane
or black polythene and then gravel, to prevent weeds from growing.
Fix timbers around the edge, lay a permeable membrane
over the area to suppress weeds and put down a 2in layer of gravel.
A further six will also be put forward for the work, which involves digging out half a metre of topsoil and putting down a permeable membrane
before replacing it with clean soil.
A permeation dryer passes the sample over a selectively permeable membrane
for moisture removal, transferring water through the membrane as a vapour so that condensate does not form during the dying process.
When a direct current (DC) is passed through the cell, the cations migrate from the diluting compartment through the cation permeable membrane
toward the cathode; the anions migrate toward the anode through the anion permeable membrane
The permeable membrane
of the autoclave bags allows free flow of C[O.
It is laminated with Tetratex Release--a highly permeable membrane
which acts as a primary dust cake and is suitable for use where dust particles are primarily larger than 5 microns.
Natick project engineer George Costas said that one of the most promising technologies for future protective garments is the selectively permeable membrane