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Updated: Jun 4, 2026

Fluorescence Imaging with One-nanometer Accuracy (FIONA)
Published on: September 26, 2014
Fluorescence Imaging with One-Nanometer Accuracy (FIONA) of Cy3-DNA under Deoxygenation Conditions
Paul R Selvin1, Tyler Lougheed, Melinda Tonks Hoffman
1Biophysics Center and Physics Department, University of Illinois, Urbana, IL 61801, USA.
Abstract:
INTRODUCTIONFIONA, short for fluorescence imaging with one-nanometer accuracy, is a simple method for achieving localization of single (or single groups of) fluorophores with nanometer accuracy in the xy plane. This protocol provides the steps necessary to run a control experiment, using DNA labeled with Cy3, to assess the efficacy of the FIONA setup and the level of attainable resolution. The Cy3-DNA is immobilized on a coverslip and imaged under deoxygenation conditions. It is important that the fluorophores remain photostable throughout the experiment. This requires an oxygen-scavenging system (e.g., glucose oxidase and catalase) in the medium.
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