This is a test commonly used when trying to identify Gram-negative ... Because the same pH indicator (phenol red) is also used in these fermentation tubes, the same results are considered positive ...

This test is used to identify bacteria capable of hydrolyzing ... This weak base raises the pH of the media above 8.4 and the pH indicator, phenol red, turns from yellow to pink. Proteus mirabilis is ...

Compounds with a phenol group will form a blue, violet, purple, green, or red-brown color upon addition of aqueous ferric chloride. This reaction can be used as a test for phenol groups. Mix several ...