| LE | <abbreviation> Left eye; lupus erythematosus. (05 Mar 2000) |
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| Le antigens | <haematology> A pair of blood group activities associated with the A, B, H substances. Lewis Lea is a separate gene, whereas Leb arises from the combined activity of the enzymes specified by Le(a) and H genes. (18 Nov 1997) |
| Le Bel, Joseph Achille | <person> French chemist, 1847-1930. See: Le Bel-van't Hoff rule. (05 Mar 2000) |
| Le Bel-van't Hoff rule | The number of stereoisomers of an organic compound is 2n where n represents the number of asymmetric carbon atoms (unless there is an internal plane of symmetry). A corollary of their simultaneously announced conclusions, in 1874, that the most probable orientation of the bonds of a carbon atom linked to four groups or atoms is toward the apexes of a tetrahedron, and that this accounted for all then-known phenomena of molecular asymmetry (which involved a carbon atom bearing four different atoms or groups). See: stereoisomerism. (05 Mar 2000) |
| LE body | <pathology> A globular mass of nuclear material that stains with haematoxylin, associated with lesions of systemic lupus erythematosus. (18 Nov 1997) |
| LE cell | <pathology> Phagocyte that has ingested nuclear material of another cell: characteristic of systemic lupus erythematosus. (18 Nov 1997) |
| le cell test | <investigation> A test for lupus that measures the presence of autoantibodies against nuclear proteins in the blood. Performed on a normal venipuncture specimen, this test is positive in 70 to 80% of patients with lupus. Some patients with rheumatoid arthritis, scleroderma and drug-induced lupus may also have a positive test result. (27 Sep 1997) |
| Le Chatelier's law | If external factors such as temperature and pressure disturb a system in equilibrium, adjustment occurs in such a way that the effect of the disturbing factors is reduced to a minimum. Synonym: Le Chatelier's principle. (05 Mar 2000) |
| Le Chatelier's principle | If external factors such as temperature and pressure disturb a system in equilibrium, adjustment occurs in such a way that the effect of the disturbing factors is reduced to a minimum. Synonym: Le Chatelier's principle. (05 Mar 2000) |
| Le Chatelier, Henri | <person> French physical chemist, 1850-1936. See: Le Chatelier's law, Le Chatelier's principle. (05 Mar 2000) |
| LE factors | Antinuclear immunoglobulins in plasma of persons with disseminated lupus erythematosus, associated with positive LE tests. (05 Mar 2000) |
| Le Fort | Leon C., French surgeon and gynecologist, 1829-1893. See: Le Fort I fracture, Le Fort II fracture, Le Fort III fracture, Le Fort sound, Le Fort's amputation. (05 Mar 2000) |
| Le Fort I fracture | A fracture of the facial bones in which there is a horizontal fracture at the base of the maxillae above the apices of the teeth. Synonym: horizontal fracture, Le Fort I fracture. (05 Mar 2000) |
| Le Fort II fracture | A fracture of the midfacial skeleton with the principal fracture lines meeting at an apex at or near the superior aspect of the nasal bones. Synonym: Le Fort II fracture. (05 Mar 2000) |
| Le Fort III craniofacial dysjunction | A complex fracture in which the facial bones are separated from the cranial bones. Synonym: Le Fort III craniofacial dysjunction, Le Fort III fracture, transverse facial fracture. (05 Mar 2000) |