Transformation efficiency
Total number of colonies growing on the LB/amp per μg of plasmid DNA used for the transformation
Initial amount or mass of plasmid DNA
Total amount of DNA (μg) = concentration (μg/μl) X volume (μl)
Fraction of DNA solution spread
Volume of solution spread on plate divided by total amount in tube = fraction spread
Mass of DNA spread on the experimental plate
Total mass of DNA [μg] X fraction spread = Mass of DNA spread
Number of colonies per μg of plasmid DNA
Number of colonies observed divided by mass of DNA spread = Transformation efficiency