| http://www.w3.org/ns/prov#value | - The effective amount of permeation modifier, i.e., the amount of permeation modifier contacted in a non-uniform distribution across the wall of the asymmetric membrane is that which is sufficient to improve the selectivity of the membrane, but insufficient to impair the mechanical integrity, strength, or other physical properties of the membrane which are detrimental to the function of the membran
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