| Acronym | Meaning |
| RBP | Retinol Binding Protein |
| DIN | Dissolved Inorganic Nitrogen |
| LTER | Long Term Ecological Research |
| NPIRS | National Pesticide Information Retrieval System |
| EKT | Extended Koopmans Theorem |
| SOPPA | Second-order Polarization Propagator Approxn. |
| HDS-MAT | Hydrodesulfurization Micro-activity Test |
| ARS | Agricultural Research Service (US Dept. Of Agriculture) |
| AOS | Alpha Olefin Sulfonate (surfactant) |
| SIS | Safety Injection System |