Definition of REPROACH. 1. : an expression of rebuke or disapproval. 2. 3. a: a cause or occasion of blame, discredit, or disgrace b: discredit, disgrace. 4.
What is the difference between a spectrophotometer and a photometer? A photometer simply measure the total lumens of a light source, while a spectrophotometer will measure a whole spectral of that same light source.
They measure the absorbance, which is known as the optical density (OD), on a spectrophotometer. One can tell from the OD whether the bacteria are actively dividing or whether they are starting to die. Spectrophotometers use a light source to shine an array of wavelengths through a monochromator.This device then transmits a narrow band of light, and the spectrophotometer compares the light intensity passing through the sample to that passing through a reference compound.hey measure the absorbance, which is known as the optical density (OD), on a spectrophotometer. One can tell from the OD whether the bacteria are actively dividing or whether they are starting to die. Spectrophotometers use a light source to shine an array of wavelengths through a monochromator.