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1 kwi 2014 · Descriptionevaluation of Durham tube fermentation, acid and carbon dioxide production, phenol red color change, coliforms.
This video demonstrates how to inoculate and interpret the phenol red test and starch hydrolysis test.
These are the Phenol Red Tests for Fermentation images my online microbiology lab students need to observe and report on for their Lab 7 procedure. Textbook ...
10 sie 2022 · Phenol Red Broth is a general-purpose differential test medium typically used to differentiate gram negative enteric bacteria. It contains peptone, phenol red (a pH indicator), a Durham tube, and one carbohydrate (glucose, lactose, or sucrose).
Phenol red pH indicator appears red or orange at neutral pH and appears yellow or clear at an acidic pH. A change in color in the tube from red or orange to yellow or clear indicates that the organism has fermented that carbohydrate, producing acid end products.
Describe how the fermentation test works including the functions of phenol red and Durham tubes. Tell that fermentation can utilize different carbohydrates resulting in different fermentation reactions. Successfully conduct and interpret fermentation tests.
In order to test for these fermentation products, you inoculate and incubate tubes of media containing a single carbohydrate (such as lactose or maltose), a pH indicator (such as phenol red) and a Durham tube (a small inverted tube to detect gas production).
