title: Correction for the inherent error in optical density readings.
abstract: Except at very low levels, uncorrected photometric determination of bacterial cell densities showed a decreasing proportionally to actual cell density or dry weight. A standard curve was prepared to convert photometric readings to truly proportional optical density values. With one dry weight determination, optical density values may be converted to absolute dry weight values.
mesh_terms: D004926:Escherichia coli / Q000254:growth & development; D008954:Models, Biological; D010783:Photometry / Q000592:standards*