Detector response, photon statistics, binding and the meaning of assay measurements.
Use these foundations when a summary statistic or fitted curve looks more convincing than the underlying measurements.
A higher Z′ can reflect nonlinear detector compression rather than a better assay. This article explains how bright-well variation can shrink while effect sizes become distorted, and how to check proportionality without confusing detector behavior with assay chemistry.
Longer luminescence reads help when photon collection limits precision, but they cannot remove persistent differences between wells. This article shows how to compare repeated reads with independently prepared replicates, account for background noise, and choose a useful stopping point.
A fluorescence-polarization value is calculated from parallel and perpendicular intensity measurements, and the ratio can hide low photon counts or timing mismatch. The article explains how to preserve both channels, interpret intensity and binding curves, and qualify tracer and reader behavior.
Binding can change tracer brightness and shift an apparent Kd while the curve still fits beautifully. See the equations, controls and fluorescence data to keep.