| 摘要 |
The invention provides an article (20) comprising a substrate (1) having a micro-structured surface that defines a plurality of channels (4) and a fluid that is separated from the substrate until activation of the article is desired, wherein the article is designed such that it can be activated at a desired point in time to allow contact of the fluid with at least one of the channels of the substrate, said article being adapted for providing a measurable variable electrical characteristic, said variability being in correspondence with the progress of the fluid as it migrates through the channels of the substrate.
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