| CNR | cannabinoid receptor; Center for Nursing Research; contrast-to-noise ratio; Council of Nurse Researc... |
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| CTN | calcitonin; clinical trials notification; computer tomography number; continuous noise |
| ELN | elastin; electronic noise |
| LEPN | effective perceived noise level |
| LPFN | low-pass filtered noise |
| environmental quality standard | This regulatory value defines the maximum concentration of a potentially toxic substance which can be allowed in an environmental compartment, usually air (air quality standard - AQS) or water, over a defined period. (09 Oct 1997) |
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