| TPG | transmembrane potential gradient; transplacental gradient; tryptophan peptone glucose [broth] |
|---|---|
| BDR | background diabetic retinopathy |
| BI | background interval; bacterial or bactericidal index; base-in [prism]; basilar impression; Billroth ... |
| Bkg | background |
| GRASS | Gradient Recalled Acquisition at Steady State |