| ILS | idiopathic leucine sensitivity; idiopathic lymphadenopathy syndrome; increase in life span; infrared... |
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| IRED | infrared light-emitting diode |
| IR-LED | infrared light emitting diode |
| ITIL | inter-alpha-trypsin inhibitor, light chain |
| kappa | a light chain of human immunoglobulins [chain] |
| light-o'-love | 1. An old tune of a dance, the name of which made it a proverbial expression of levity, especially in love matters. "Best sing it to the tune of light-o'-love." 2. Hence: A light or wanton woman. Source: Websters Dictionary (01 Mar 1998) |
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| light reactions | In photosynthesis, aseries of reactions in which light energy isconverted to chemical energy with the help of chlorophyll. ATP iscreated along with hydrogen ions and electrons as water molecules aresplit apart. (09 Oct 1997) |
| light reflex | A red glow reflected from the fundus of the eye when a light is cast upon the retina, as in retinoscopy. Synonym: eye reflex, fundus reflex, pupillary reflex. Synonym: pyramid of light. (05 Mar 2000) |
| light-repressible receptor protein kinase | <enzyme> Photo-regulated protein isolated from arabidopsis thaliana; genbank x97774 Registry number: EC 2.7.1.- Synonym: lrrpk gene product (26 Jun 1999) |
| light scattering | Particles suspended in a solution will cause scattering of light and the extent of the scattering is related to the size and shape of the particles (in a somewhat complex relationship). (18 Nov 1997) |
| light sense | The ability to perceive variations in the degree of light or brightness. (05 Mar 2000) |
| light sleep | A condition of half sleep. Synonym: light sleep. Origin: dys-+ G. Nystaxis, drowsiness (05 Mar 2000) |
| light treatment | Treatment with light. For example, a newborn with jaundice may be put under the lights. (12 Dec 1998) |
| light water | <radiobiology> Ordinary H2O, as opposed to heavy water, which contains atoms of the heavier isotopes of hydrogen, deuterium and/or tritium. See: hydrogen, isotope, deuterium, tritium, heavy water. (09 Oct 1997) |
| light-water reactor | <radiobiology> Class of fission reactors using ordinary light water as a coolant, rather than liquid metal or heavy water (water with deuterium instead of hydrogen). (09 Oct 1997) |
| light wire appliance | An orthodontic appliance utilizing small gauge labial wires with expansion and contraction loops formed into it and attached to bands fitted to individual teeth; sometimes called Begg light wire differential force technique. (05 Mar 2000) |