Presumptive Test- Lab 41 Flashcards Preview

Micro Lab Practical #1 > Presumptive Test- Lab 41 > Flashcards

Flashcards in Presumptive Test- Lab 41 Deck (4)
Loading flashcards...

List the three steps of water testing in order

1. Presumptive test
2. Confirmed test
3. Completed test


What constitutes a positive presumptive test

Production of acid is determined by the change of the medium from green to yellow.
Production of gas you look for a gas bubble in the durham tube


What do yellow and blue tubes with no bubbles indicate



Define coliforms

All facultative anaerobic gram-negative rods which produce acid & gas from lactose fermentation in 48 hours and 35°C