To test the oxidase-producing microorganisms.
The oxidase determines whether microbes can oxidize certain aromatic amines, e.g., paraaminodimethyl alanine to form a colored end product. This oxidation correlates with the cytochrome oxidase activity of some bacteria, including the genera Pseudomonas and Nisseria. A positive test is important in identifying these genera, and also useful for characterizing the Enterobacteria, which are oxidase-negative.
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