| MERRF | myoclonus epilepsy with ragged red fibers [syndrome] |
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| MERRLA | myoclonus epilepsy-ragged red fibers-lactic acidosis [syndrome] |
| NM | near-miss; neomycin; neuromedin; neuromuscular; neutrophil migration; nictitating membrane; nitrogen... |
| PHIM | posthypoxic intention myoclonus |
| PME | periodic monitoring examination; phosphomonoester; polymorphonuclear eosinophil; progressive myoclon... |
| okadaic acid-sensitive phosphatase | <enzyme> Negatively controls the cyclin degradation pathway in amphibian eggs Registry number: EC 3.1.3.- Synonym: oas-phosphatase (26 Jun 1999) |
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| temperature-sensitive mutant | A viral mutant that is able to replicate at one portion of a temperature range but not at another, the parent (wild type) strain being able to replicate over the whole temperature range. Compare: cold-sensitive mutant, quick-stop mutant. (05 Mar 2000) |
| temperature sensitive mutation | <genetics, molecular biology> A type of conditional mutation in organism, somatic cell or virus that makes it possible to study genes whose total inactivation would be lethal. Such ts mutations can also make possible studies of the effect of reversible switching by temperature changes) in expression of the mutated gene. The usual mechanism of temperature sensitivity is that the mutated gene codes for a protein with a temperature dependent conformational instability, so that it possesses normal activity at one temperature (the permissive temperature), but is inactive at a second (nonpermissive) temperature. (18 Nov 1997) |
| threatened, endangered, and sensitive species | formal classifications of species. Sensitive Species for which population viability is a concern. Sensitive species are not federally designated under the Endangered Species act. The U.S. Fish and Wildlife Service, after study, makes the following designations (05 Dec 1998) |
| adequate stimulus | A stimulus to which a particular receptor responds effectively and that gives rise to a characteristic sensation; e.g., light and sound waves that stimulate, respectively, visual and auditory receptors. (05 Mar 2000) |
| aversive stimulus | <psychology> A noxious stimulus such as an electric shock used in aversive training or conditioning. See: aversive training. (05 Mar 2000) |
| maximal stimulus | A stimulus strong enough to evoke a maximal response. (05 Mar 2000) |
| conditioned stimulus | A stimulus applied to one of the sense organs (e.g., receptors of vision, hearing, touch) which are an essential and integral part of the neural mechanism underlying a conditioned reflex. See: classical conditioning, higher order conditioning. (05 Mar 2000) |
| heterologous stimulus | A stimulus that acts upon any part of the sensory apparatus or nerve tract. (05 Mar 2000) |
| heterotopic stimulus | Any electrical activation from an abnormal locus. (05 Mar 2000) |
| homologous stimulus | A stimulus that acts only on the nerve terminations in a special sense organ. (05 Mar 2000) |
| stimulus | Origin: L, for stigmulus, akin to L. Instigare to stimulate. See Instigare, Stick. 1. A goad; hence, something that rouses the mind or spirits; an incentive; as, the hope of gain is a powerful stimulus to labour and action. 2. <physiology> That which excites or produces a temporary increase of vital action, either in the whole organism or in any of its parts; especially, any substance or agent capable of evoking the activity of a nerve or irritable muscle, or capable of producing an impression upon a sensory organ or more particularly upon its specific end organ. Of the stimuli applied to the sensory apparatus, physiologists distinguish two kinds: (a) Homologous stimuli, which act only upon the end organ, and for whose action the sense organs are especially adapted, as the rods and cones of the retina for the vibrations of the either. (b) Heterologous stimuli, which are mechanical, chemical, electrical, etc, and act upon the nervous elements of the sensory apparatus along their entire course, producing, for example, the flash of light beheld when the eye is struck. Source: Websters Dictionary (01 Mar 1998) |
| stimulus control | The use of conditioning techniques to bring the target behaviour of an individual under environmental control. See: classical conditioning. (05 Mar 2000) |
| stimulus generalisation | <psychology> The tendency to react to stimuli that are different from, but somewhat similar to, the stimulus used as a conditioned stimulus. (12 Dec 1998) |
| stimulus generalization | In Pavlovian conditioning, the eliciting of a conditioned response by stimuli never before experienced but which are similar to a particular conditioned stimulus. See: conditioning, classical conditioning. (05 Mar 2000) |