We discuss the phenomenon of enhanced fluorescence in the proximity of metal nanostructures addressing the question of how much fluorescence signal can be obtained from fluorophores in such altered environments. We review its applicability for the methodologies used in the life science, such as immunoassays, flow cytometry and bioimaging. Experimental and theoretical scenarios employing various metal nanostructures - such as homogeneous enhancing substrates, fluorescence-enhancing microbeads, and metal core-dielectric shell nanocomposites - are described.
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