| QRS | in electrocardiography, the complex consisting of Q, R, and S waves, corresponding to depolarization... |
|---|---|
| QRS-T | the angle between the QRS and T vectors in vectorcardiography [angle] |
| F' | a hybrid F plasmid |
| F- | a bacterial cell lacking an F plasmid |
| F+ | a bacterial cell having an F plasmid |