| BLS | bare lymphocyte syndrome; basic life support; blind loop syndrome; blood and lymphatic system; blood... |
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| BLSA | basic life support ambulance |
| BP | Bachelor of Pharmacy; back pressure; barometric pressure; basic protein; bathroom privileges; bed pa... |
| BPI | bacterial permeability-increasing [protein]; Basic Personality Inventory; beef-pork insulin; blood p... |
| BRAC | basic rest-activity cycle |
| Kestenbaum's number | The difference between the two pupil diameters when each eye is measured in bright light with the other eye tightly covered; an indicator of the relative afferent pupillary defect in patients with two normally innervated irises. (05 Mar 2000) |
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| Knoop hardness number | A number obtained by dividing the load in kg applied to a pyramid-shaped diamond of specific size divided by the projected area of the impression: KHN = L/A, where A= the projected area of the impression in mm2 and L= the load in kg; used for measurements of hardness of any materials, especially very hard and brittle substances such as tooth dentin and enamel. (05 Mar 2000) |
| Koettstorfer number | The number of milligrams of KOH required to saponify 1 g of fat; an approximate measure of the average molecular weight of a fat, with which it varies inversely. Synonym: Koettstorfer number. (05 Mar 2000) |
| fluoride number | The percent inhibition of pseudocholinesterase produced by fluorides; used to differentiate normal from atypical pseudocholinesterases. See: dibucaine number. (05 Mar 2000) |
| f-number | <radiobiology> In optics, denotes the ratio of the equivalent focal length of an objective lens to the diameter of its entrance pupil. (09 Oct 1997) |
| linking number | A property of a long biopolymer (such as duplex DNA) equal to the number of twists (related to the frequency of turns around the central axis of the helix) plus the writhing number. (05 Mar 2000) |
| Loschmidt's number | The number of molecules in 1 cm3 of ideal gas at 0캜 and 1 atmosphere of pressure; Avogadro's number divided by 22,414 (i.e., 2.6868 × 1019 cm-3). (05 Mar 2000) |