| NA | Avogadro constant or number; nalidixic acid; Narcotics Anonymous; network administrator; neuraminida... |
|---|---|
| NaERC | sodium efflux rate constant |
| pK | negative logarithm of the dissociation constant; plasma potassium |
| pK' | apparent value of a pK; negative logarithm of the dissociation constant of an acid |
| pKa | negative logarithm of the acid ionization constant |