| Acronym | Meaning |
 | QRA | Quantitative Risk Assessment |
| PESM | Photoelectron Spectromicroscopy |
| EMSL | Environmental Monitoring And Support Laboratory |
| MPN | Most Probable Number |
| DCCC | Droplet Counter Current Chromatography |
| SCRPA | Separated Channel RPA |
| PCAD | Power Conditioning And Distribution (in Spacecraft) |
| CIP | Configuration Interaction With Partner Orbitals |
| NBOD | Nitrogenous Biochemical Oxygen Demand |
| LD | Laser Diode |
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