| NO | Nitric oxide |
| NOS | Nitric oxide synthase |
| ONRB | Oral nitrate-reducing bacteria |
| BP | Blood pressure |
| eNOS | Endothelial nitric oxide synthase |
| nNOS | Neuronal nitric oxide synthase |
| iNOS | Inducible nitric oxide synthase |
| Nar | Membrane-bound respiratory nitrate reductase |
| Nap | Periplasmic nitrate reductase |
| RNS | Reactive nitrogen species |