| Acronym | Meaning |
 | ACP | Amorphous Calcium Phosphate |
| PAA | Photon Activation Analysis |
| GCLDA | Gradient-corrected Local Density Approximation |
| GIFT | Gamete Intrafallopian Transfer |
| PESC | Photoelectrochemical Solar Cell |
| PACE | Pacific Atmospheric Chemistry Experiment |
| NSDL | National Science Digital Library |
| WMO | World Meteorological Organization |
| TREPR | Time-resolved Electron Paramagnetic Resonance |
| PAGIRS | Pesticide Assessment Guidelines Information Retrieval System |
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