| emission |
1. The act of sending or throwing out; the act of sending forth or putting into circulation; issue; as, the emission of light from the sun; the emission of heat from a fire; the emission of bank notes.
2. That which is sent out, issued, or put in circulation at one time; issue; as, the emission was mostly blood.
3. <physics> Emission theory, the theory of Newton, regarding light as consisting of emitted particles or corpuscles. See Corpuscular theory.
Origin: L. Emissio: cf. F. Emission.
Source: Websters Dictionary
(01 Mar 1998) |
| emission-computed tomography |
<radiology> Tomography using emissions from radionuclides and a computer algorithm to reconstruct the image.
(20 Jun 2000) |
| emission electron |
<physics>? A beta particle resulting from radioactive decay.
(05 Mar 2000) |
| emission offset |
<chest medicine> A reduction in the air pollution emissions of existing sources to compensate for emissions from new sources.
(05 Dec 1998) |
| emission standard |
This regulatory value is a quantitative limit on the emission or discharge of a potentially toxic substance from a source. The simplest form for regulatory purposes is a uniform emission standard (UES) where the same limit is placed on all emissions of a particular contaminant.
(09 Oct 1997) |
| field-emission microscope |
<instrument, microscopy> Either one of two kinds of point-projection microscopes, both invented by E. W. Muller: (1) The older device (1936) is a specialised cathode-ray tube, employing field-emission of electrons from a negatively charged tip of a very sharp needle in a vacuum, by point-projection of the image onto a positively charged, fluorescent screen. (2) A later device (field-ion-mission microscope, 1950) emits absorbed helium ions from an anode.
(05 Aug 1998) |
| field emission tube |
An X-ray tube that uses a cold cathode, relying on the tube voltage to pull electrons from it to the anode.
(05 Mar 2000) |
| flame emission spectrophotometry |
Determination of the concentration of an element by measurement of light emitted when the element is excited by energy in the form of heat.
(05 Mar 2000) |
| acetyl-CoA:alpha-glucosaminide acetyltransferase |
<enzyme> An enzyme involved in the synthesis of certain carbohydrate moieties on proteins. A deficiency of this enzyme leads to mucopolysaccharidosis type III C.
(05 Mar 2000) |
| adrenergic alpha-agonists |
Drugs that selectively bind to and activate alpha adrenergic receptors.
(12 Dec 1998) |
| adrenergic alpha-antagonists |
Drugs that bind to but do not activate alpha-adrenergic receptors thereby blocking the actions of endogenous or exogenous adrenergic agonists. Adrenergic alpha-antagonists are used in the treatment of hypertension, vasospasm, peripheral vascular disease, shock, and pheochromocytoma.
(12 Dec 1998) |
| alpha |
First letter of the Greek alphabet, a.
(05 Mar 2000) |
| alpha-1,3-mannosylglycoprotein beta-1,4-N-acetylglucosaminyltransferase |
<enzyme> Incorporates n-acetyglucosamine as the third branch of complex n-glycosyl-oligosaccharide of hen oviduct
Registry number: EC 2.4.1.145
Synonym: glcnac-transferase iv, n-acetylglucosaminyltransferase iv, udp-glcnac-gngn(glcnac to man alpha1-3)beta 4-n-acetylglucosaminyltransferase iv
(26 Jun 1999) |
| alpha-1,4-glucan lyase |
<enzyme> Degrades alpha-1,4-glucan to produce 1,5-anhydrofructose; from seaweeds gracilariopsis lemaneiformis and gracilaria verrucosa; mw 111 kD; amino acid sequence has been determined
Registry number: EC 4.2.2.-
Synonym: alpha-1,4-glucan 4-lyase
(26 Jun 1999) |
| alpha 1-4-mannosyltransferase |
<enzyme> From mycobacterium smegmatis; involved in methylmannose polysaccharide elongation; GDP-mannose is donor
Registry number: EC 2.4.1.-
(26 Jun 1999) |
