Most Probable Number
An estimate of microbial density per unit volume of water sample, based on probability theory.
Source: Terms of the Environment ...
Most Probable Number (MPN): statistical expression for estimating the number of microorganisms in a culture or a volume of water.
most probable number (MPN) Usually applied to tube fermentation procedures for coliforms and fecal streptococci.
most probable number (MPN). MPN is the Most Probable Number of coliform-group organisms per unit volume of sample water. Expressed as the number of organisms per 100 mL off sample water.
 See also: Water, Density, Pesticide, Alkali, Discharge
  
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