| libido theory | Freud's theory that humans psychic life results mainly from instinctual or libidinal needs and the attempts to satisfy them. (05 Mar 2000) |
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| Liebig's theory | That the hydrocarbons that oxidise readily and burn are aliments that produce the greatest quantity of animal heat. (05 Mar 2000) |
| lipoid theory of narcosis | That narcotic efficiency parallels the coefficient of partition between oil and water, and that lipoids in the cell and on the cell membrane absorb the drug because of this affinity. Synonym: Meyer-Overton theory of narcosis. (05 Mar 2000) |
| local circuit theory | <physiology> A generally accepted model for neuronal conduction, by which depolarisation of a small region of a neuronal plasma membrane produces transmembrane currents in the neighbouring regions, tending to depolarise them. As the sodium channels are voltage gated, the depolarisation causes further channels to open, thus propagating the action potential. (18 Nov 1997) |
| lymphatic dissemination theory of endometriosis | That endometrial tissue is transmitted by the lymphatic channels. (05 Mar 2000) |