photometry free radical elective evaluator photometry 2022-05-06T18:43:52Z FREE photometry MMO:0000844 PMID:25189624 This is the application of photometry (measurement of transmittance (a linear scale from 0-100%) or absorbance (a logarithmic scale from zero to infinity) of particular wavelengths of light by the use of filters) to the assessment of oxidative stress by measuring the level of free radicals (unstable atoms that can damage cells). measurement_method_ontology slaulede