MathBench > Microbiology

Serial Dilution, or...
How to count to a million

sleeping studentCount a plate!

Once again, let's take a breather from the theory and practice. This is one of the do-it-in-your-sleep kind, and it has two steps:

  1. Look at the dilution scheme to determine the total dilution factor
  2. Look at the plate and scale up to determine the total CFUs per mL.

Scaling up...


Total dilution factor (decimal) total number

Your browser does not support html canvas. There were CFUs on the plate.
How many CFUs would there be
in 1mL of the original stock?