| APM | Academy of Parapsychology and Medicine; Academy of Physical Medicine; Academy of Psychosomatic Medic... |
|---|---|
| ARM | adrenergic receptor material; aerosol rebreathing method; ambulatory renal monitor; anorectal manome... |
| BRM | biological response modifier; biuret reactive material |
| CRM | Certified Reference Materials; counting rate meter; cross-reacting material; crown-rump measurement |
| ECM | electronic claims management; embryonic chick muscle; erythema chronicum migrans; experimental cereb... |
| ECM | extra-cellular material |
|---|---|
| PCM | pericentriolar material |
| SAM | surface active material |
| elements, radioactive | Chemical elements which spontaneously transmute into another element with corpuscular or electromagnetic radiation. The natural radioactive elements are all those with an atomic number above 83, and some other elements, such as potassium (atomic number 19) and rubidium (atomic number 7), which are very weakly radioactive. (12 Dec 1998) |
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