| http://www.w3.org/ns/prov#value | - Skeleton materials that are frequently used for the functional layer are papers, the above-mentioned textile fabrics made of natural or synthetic fibres or porous plastic materials such as membranes and in particular asymmetric porous membranes in which case the sample liquid to be examined is usually applied to the large-pored side of the membrane and the analyte is determined on the fine-pored s
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