- Increase the sample students in 3 concentrations of 10-2, 10-3, 10-4.
- Each concentration done in 3-vitro proliferation.
- Using a micropipette suction 1 mL samples at concentrations in vitro do10-2 for environmental 5ml contains lactose Borth in vitro tube containing the same durham.Thuc for the remaining two test tubes at a concentration of 10-2.
- in the remaining 2 concentrations similar implementation at a concentration of 10-2 .
- Then bring 9 vitro incubation for 24 hours at 37 ° C.
- When placing tubes in vitro durham durham tube mouth facing the bottom of the test tube.
- specify levels, environmental name to each test tube.
- environment lactose Borth has its ingredients are lactose role if coliform use lactose will make the steam generator tubes or durham floating inner tubes of air bubbles larger than 1/10 the volume durham durham tubes.
- a culture in 3 levels consecutive 10-2, 10-3, 10-4
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