Carbohydrate (CHO) Fermentation [Durham Tube Test]

The video tutorial explains the carbohydrate fermentation test, also known as the Durham tube test. It describes the setup, which includes a large test tube with broth and an inverted Durham tube. The test determines if bacteria can ferment specific sugars, producing acid and sometimes gas. Positive results turn the broth yellow due to a pH indicator, while negative results remain red. The video also covers interpreting results, including the significance of gas production.

What does it mean if the broth turns yellow in the test?

How do you indicate a positive result that also produces gas?

What indicates a negative result in a carbohydrate fermentation test?