| Acronym | Meaning |
 | PPAC | Parallel-plate Avalanche Counter |
| POCI | Parent Orbital Configuration Interaction |
| IE | Ionization Energy |
| CLS | Characteristic Loss Spectroscopy |
| TC/MS | Thermal Chromatography/mass Spectrometry |
| PPA | Pollution Prevention Act (of 1990) |
| PSF | Point Spread Function |
| TLV | Threshold Limit Value |
| RFA | Regulatory Flexibility Act |
| APO B | Apolipoprotein B |
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