# 5.4: Results

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## Enumeration and Dilution

1.              Read lab procedure section on how to obtain colony counts and CFU/mL in the original Serratia marcescens sample.

2.              Record data from your Serratia marcescens plates here:

 final dilution colony count 10-5 10-6 10-7 10-8 10-9

CFU/mL of original Serratia marcescens sample =____________________

3.          Record the class data here for the Serratia marcescens broth culture:

 Individual Student data Dilution with 30-300 colonies Number of colonies on plate CFU/mL in original Serratia marcescens sample 1 2 3 4 5 6 7 8 9 10 11 12

Class average:_____________________

4.      Practice question

 Final sample dilution Colony Count* CFU/mL in original sample 1/1000 135 10-6 48 10-8 6.5 x 109 99 9.9 x l06

*Remember the 30-300 colonies per plate rule.

5.4: Results is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.