"Fluorescence intensity" refers to the brightness or strength of the glow emitted by a fluorescent substance when it is exposed to certain types of light. Full definition
The changes in fluorescence intensity of the probe correspond to the alterations of oxidized: reduced GSH, which is highly indicative of overall redox balance. (sciencedaily.com)
The difference in fluorescence intensities between wild - type and CCHa2 - R mutant IPCs became significant as early as 2 minutes after CCHa2 administration and lasted at least for 7 minutes (S6 Fig). (journals.plos.org)
C, Scatterplot comparing relative fluorescence intensity for normalized P2X3 and GFP immunoreactivity. (jneurosci.org)