indirectly measuring growth - turbidimetry

• what is a way to indirectly count cells


  by measuring the turbidity of the culture gives an indirect measure of growth
• what is meant by turbidity


  cloudiness
• what is used to measure turbidity


  a colorimeter
• what type of cell count is the use of a colorimeter


  total cell count
• How does a colorimeter work?


  measurements of the bacteria population are derived by finding the absorbance of the suspension
• why is the results of a colorimeter a total cell count


  because it cannot distinguish between living and dead cells
• what is meant by a absorbance reading on a colorimeter


  absorbance indicates light not allowed through the sample
• what is meant by a transmission reading on a colorimeter


  this indicates the light passing though