| Acronym | Meaning |
| DHFR | Dihydrofolate Reductase |
| KIE | Kinetic Isotope Effect |
| SPUPS | Spin Polarised Ultraviolet Photoelectron Spectroscopy |
| ICSCF | Internally Consistent Self-consistent Field |
| CRREL | US Army Cold Regions Research And Engineering Laboratory |
| BSSEC | Basis-set Superposition Error Correction |
| LINE | Long Interspersed Element |
| EEAES | Electron-excited Auger Electron Spectroscopy |
| DOI | Department Of The Interior |
| VOF | Volatile Org. Fraction |