| Acronym | Meaning |
 | TNRCC | Texas Natural Resource Conservation Commission |
| HRT | Hormone Replacement Therapy |
| BHMT | Betaine-homocysteine Methyltransferase |
| IRI | International Reference Ionosphere |
| OSRSCF | Open-shell Restricted SCF |
| SIOS | Semiclassical Infinite-order Sudden (in Rotationally-inelastic Scattering Calcns.) |
| HDM | House Dust Mite |
| ACL | Alternative Concentration Limit |
| MDI | Methylene Di-p-phenylene Isocyanate |
| IOHA | International Occupational Hygiene Association |
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