| http://www.w3.org/ns/prov#value | - The invention relates to novel membranes and their use as reagent substrates for analytical agents which can be employed for the dry-chemical determination of components of aqueous solutions, mainly body fluids, such as blood, urine, serum, milk or the like, and their preparation from a water-in-oil emulsion of a hydrophilic water-containing, and preferably water-soluble, polymer and a solution of
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