absorbance
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Spectrophotometry: Measuring Concentration With Light
A spectrophotometer never measures concentration; it measures how much light failed to arrive, and the difference matters as soon as readings stop being linear.
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ELISA: The Workhorse Immunoassay Explained Step by Step
Four ELISA formats share the same plate and the same colour change but measure quite different things, and knowing which one a kit uses changes how…
