| Acronym | Meaning |
 | PGNAA | Prompt Gamma Neutron Activation Analysis |
| PINN | Proposed International Nonproprietary Names (for Drugs) |
| DBRA | Division Of Biometry And Risk Assessment |
| DTGF | Double-time Green Function |
| PNA | Paraffins, Naphthenes, And Aromatics (in Petroleum Analysis) |
| CIN | Chemical Industry Notes |
| CELSIUS | Cooling With Electrons And Storing Of Ions From The Uppsala Synchrocyclotron |
| TEG | Triethylene Glycol |
| GGA | Generalized Gradient Approxn. |
| MA | Malonic Acidpar |
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