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A microdevice based on a thin‐film hydrogenated amorphous silicon (a ‐Si:H) p‐i‐n photodiode is used to quantify the density of DNA oligonucleotides labelled with a fluorophore and the density of E. coli cells expressing GFP (green fluorescent protein) by fluorescence. An absorption filter is integrated in the device which filters the excitation light and transmits the emitted light to the photodetector...
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