Paracoccus denitrificans

**Paracoccus denitrificans** is a Gram-negative, facultative anaerobic bacterium that belongs to the genus *Paracoccus*. It is known for its ability to perform denitrification, a process in which nitrate (NO₃⁻) is reduced to nitrogen gas (N₂) or nitrous oxide (N₂O), contributing to the nitrogen cycle in the environment.