| Acronym | Meaning |
 | MBBR | Moving Bed Biofilm Reactor |
| NADAP | National Atmospheric Deposition Assessment Program |
| NWWA | Northwest Water Authority (UK) |
| BIAS | Bismuth-active Substance (in Surfactant Concn. Detn. In Environmental Tests) |
| EHT | Extended Hueckel Theory |
| HGF | Hermite Gaussian Function |
| PPDS | Physical Property Data Service |
| RPF | Renal Plasma Flow |
| CTBTO | Comprehensive Nuclear-Test-Ban Treaty Organization |
| VGF | Vertical Gradient Freeze |
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