Reaction 2 converts hydroxylamine to nitrite and is catalyzed by the enyzmer hydroxylamine oxidoreductase.

In particular, people with these bacteria had better memory, and better ability to pay attention and perform complex tasks. These people also had higher levels of the ion nitrite in their mouths.

Encouraging the growth of nitrite-producing bacteria like Neisseria, while reducing Prevotella and Porphyromonas, could help maintain brain function as we age. This could be achieved through ...