| excitatory amino acid agents | Drugs used for their actions on any aspect of excitatory amino acid neurotransmitter systems. Included are drugs that act on excitatory amino acid receptors, affect the life cycle of excitatory amino acid transmitters, or affect the survival of neurons using excitatory amino acids. (12 Dec 1998) |
|---|---|
| excitatory amino acid agonists | Drugs that bind to and activate excitatory amino acid receptors. (12 Dec 1998) |
| excitatory amino acid antagonists | Drugs that bind to but do not activate excitatory amino acid receptors, thereby blocking the actions of agonists. (12 Dec 1998) |
| 1-carbamoyl-L-amino acid amidohydrolase | <enzyme> From bacillus stearothermophilus; amino acid sequence given in first source Registry number: EC 3.5.1.- Synonym: carbamoyl l-aa amidohydrolase, n-carbamyl-l-amino acid amidohydrolase (26 Jun 1999) |
| benign essential tremor | A benign tremor inherited as a dominant character; it may be a rapid oscillation resembling that seen in thyrotoxicosis, a coarse tremor during rest and inhibited by a voluntary effort, or one which appears only upon movement. Synonym: benign essential tremor, familial tremor. (05 Mar 2000) |
| drugs, essential | Drugs considered essential to meet the health needs of a population as well as to control drug costs. (world health organization action programme on essential drugs, 1994, p3) (12 Dec 1998) |
| osteolysis, essential | Syndromes of bone destruction where the cause is not obvious such as neoplasia, infection, or trauma. The destruction follows various patterns: massive (gorham disease), multicentric (hajdu-cheney syndrome, winchester syndrome), or carpal/tarsal. (12 Dec 1998) |
| Eagle's minimum essential medium | A tissue culture medium similar to Eagle's basal medium but with different amounts and a few exclusions (e.g., antibiotics and phenol red). (05 Mar 2000) |
| essential | 1. Belonging to the essence, or that which makes an object, or class of objects, what it is. "Majestic as the voice sometimes became, there was forever in it an essential character of plaintiveness." (Hawthorne) 2. Hence, really existing; existent. "Is it true, that thou art but a a name, And no essential thing?" (Webster (1623)) 3. Important in the highest degree; indispensable to the attainment of an object; indispensably necessary. "Judgment's more essential to a general Than courage." (Denham) "How to live? that is the essential question for us." (H. Spencer) 4. Containing the essence or characteristic portion of a substance, as of a plant; highly rectified; pure; hence, unmixed; as, an essential oil. "Mine own essential horror." 5. Necessary; indispensable; said of those tones which constitute a chord, in distinction from ornamental or passing tones. 6. <medicine> Idiopathic; independent of other diseases. <biology> Essential character, a class of volatile oils, extracted from plants, fruits, or flowers, having each its characteristic odour, and hot burning taste. They are used in essences, perfumery, etc, and include many varieties of compounds; as lemon oil is a terpene, oil of bitter almonds an aldehyde, oil of wintergreen an ethereal salt, etc.; called also volatile oils in distinction from the fixed or nonvolatile. Origin: Cf. F. Essentiel. See Essence. Source: Websters Dictionary (01 Mar 1998) |
| essential albuminuria | A collective term for types that are not the result of pathologic changes in the kidneys. Synonym: essential albuminuria. (05 Mar 2000) |
| essential anaemia | An obsolete term for pernicious anaemia; also used formerly for any type of anaemia of unknown mechanism. (05 Mar 2000) |
| essential anisocoria | A common (20% of normals) benign inequality of the pupils that may change from one hour to the next. Synonym: essential anisocoria, physiologic anisocoria, simple-central anisocoria. (05 Mar 2000) |
| essential bradycardia | A slow pulse for which no cause can be discovered. Synonym: idiopathic bradycardia. (05 Mar 2000) |
| essential dysmenorrhoea | <gynaecology> Painful menses due to a functional disturbance and not due to organic factors such as growths, inflammation or anatomy. (27 Sep 1997) |
| essential fever | Fever without known infectious disease. (05 Mar 2000) |