| Acronym | Meaning |
| ARS | Agricultural Research Service (US Dept. Of Agriculture) |
| BAW | Bond-order Alternation Wave (mol. Orbital) |
| OIG | Office Of Inspector General |
| ARMI | Analytical Reference Materials International |
| NIPDWR | National Interim Primary Drinking Water Regulations |
| MCPF | Modified Coupled-pair Functional (method In CI Calcns.) |
| RO | Reverse Osmosis |
| ADP | Adenosine Diphosphate (RN 58-64-0) |
| CERPIES | Collision Energy Resolved Penning Ionization Electron Spectra |
| HDAC | Histone Deacetylase |