| BCM | B-cell maturation; birth control medication; blood-clotting mechanism effects; body cell mass; body ... |
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| BMI | body mass index |
| CIMS | chemical ionization mass spectrometry |
| CM | California mastitis [test]; calmodulin; capreomycin; carboxymethyl; cardiac murmur; cardiac muscle; ... |
| EHMS | electrohemodynamic ionization mass spectometry |
| Florey unit | <microbiology> The minimum amount of penicillin which will prevent the growth of Staphylococcus aureus over an area 26 mm in diameter in a standard culture medium; 1 unit equals 0.6 ug of crystalline sodium salt of penicillin. Synonym: Florey unit. (05 Mar 2000) |
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| focus-forming unit | A measurement of the concentration of live virus in a given amount of fluid. This is measured by spreading a known amount of the fluid over a layer of cultured cells which are infected by the virus, then counting the number of areas in the culture which look infected. (09 Oct 1997) |
| laminar air flow unit | An air-filtering system used at some transplant facilities to remove particulate matter and fungi from the air. (16 Dec 1997) |
| lung unit | A respiratory bronchiole together with the alveolar ducts and sacs and pulmonary alveoli into which the respiratory bronchiole leads, considered by some to include the terminal bronchiole and its subdivisions, and called a pulmonary acinus. (05 Mar 2000) |