Final answer:
The possible results after incubation and the addition of reagents containing sulfuric acid and a-naphthylamine to detect the presence of nitrite can include an acid reaction, alkaline reaction, no change in the medium, presence of H₂S, or production of CO₂ gas.
Step-by-step explanation:
After incubation, adding reagents containing sulfuric acid and a-naphthylamine to detect presence of nitrite can result in various outcomes. The results of this test are reported as appearance of the slant and butt of the medium, using A to indicate acid reaction (yellow color), K to indicate an alkaline reaction, and NC to indicate no change in the medium.
The presence of H₂S (detected as a blackening in the media) and the production of gas (CO₂) as a byproduct of fermentation are also reported if observed. Therefore, the possible results of this test can be a yellow color (acidic reaction), an alkaline reaction, no change in the medium, presence of H₂S, or production of gas (CO₂)