| RIS | radiology information system; rapid immunofluorescence staining; resonance ionization spectroscopy |
|---|---|
| ROESY | rotating frame Overhauser effect spectroscopy |
| SECSY | spin echo correlated spectroscopy |
| s | Greek lower case letter sigma; conductivity; cross section; millisecond; molecular type or bond; pop... |
| SIMS | secondary ion mass spectroscopy |