| SP | sacroposterior; sacrum to pubis; salivary progesterone; schizotypal personality; semi-private [room]... |
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| SSC | single-strand conformational [analysis]; sister strand crossover; somatosensory cortex; standard sal... |
| STP | phenol-preferring sulfotransferase; scientifically treated petroleum; sodium thiopental; standard te... |
| EOAE | Evoked Oto-Acoustic Emission test |
| LASER | Light Amplication by Stimulated Emission of Radiation |
ascites
| spontaneous emission | <radiobiology> Radiation randomly emitted by excited atoms or ions. Contrast with stimulated emission. (09 Oct 1997) |
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| stimulated emission | <radiobiology> Radiation coherently emitted by excited ions when driven by a passing light wave and the appropriate transition wavelength. Laser means Light Amplification by Stimulated Emission of Radiation, it occurs when there is a population inversion between the upper and lower energy states of the transition, such that stimulated emission can dominate excitation. Stimulated emission is coherent and codirectional with the stimulating wave, and the rate of stimulated emission is proportional to the intensity of the stimulating wave. (09 Oct 1997) |
| ion cyclotron emission | <radiobiology> As ions gyrate around in a magnetic field (see also larmor radius or cyclotron radius), they radiate radio-frequency electromagnetic waves. This is known as ion cyclotron emission, and can be measured to help diagnose a plasma. (09 Oct 1997) |
| electron cyclotron emission | <physics, radiobiology> As electrons gyrate around in a magnetic field (see also larmor radius or cyclotron radius), they radiate radio-frequency electromagnetic waves. This is known as electron cyclotron emission, and can be measured to help diagnose a plasma. (09 Oct 1997) |
| 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) |
| 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) |
| biological standard unit | A specific quantity of biologically active reference material (antibiotic, antitoxin, enzyme, hormone, vitamin, etc.). (05 Mar 2000) |
| gold standard | Term used to describe a method or procedure that is widely recognised as the best available. Origin: jargon (05 Mar 2000) |
| standard | 1. A flag; colours; a banner; especially, a national or other ensign. "His armies, in the following day, On those fair plains their standards proud display." (Fairfax) 2. That which is established by authority as a rule for the measure of quantity, extent, value, or quality; especially, the original specimen weight or measure sanctioned by government, as the standard pound, gallon, or yard. 3. That which is established as a rule or model by authority, custom, or general consent; criterion; test. "The court, which used to be the standard of property and correctness of speech." (Swift) "A disposition to preserve, and an ability to improve, taken together, would be my standard of a statesman." (Burke) 4. The proportion of weights of fine metal and alloy established by authority. "By the present standard of the coinage, sixty-two shillings is coined out of one pound weight of silver." (Arbuthnot) 5. <botany> A tree of natural size supported by its own stem, and not dwarfed by grafting on the stock of a smaller species nor trained upon a wall or trellis. "In France part of their gardens is laid out for flowers, others for fruits; some standards, some against walls." (Sir W. Temple) 6. <botany> The upper petal or banner of a papilionaceous corolla. 7. <mechanics> An upright support, as one of the poles of a scaffold; any upright in framing. 8. An inverted knee timber placed upon the deck instead of beneath it, with its vertical branch turned upward from that which lies horizontally. 9. The sheth of a plow. 10. A large drinking cup. Standard bearer, an officer of an army, company, or troop, who bears a standard; commonly called colour sergeantor colour bearer; hence, the leader of any organization; as, the standard bearer of a political party. Origin: OF. Estendart, F. Etendard, probably fr. L. Extendere to spread out, extend, but influenced by E. Stand. See Extend. 1. Being, affording, or according with, a standard for comparison and judgment; as, standard time; standard weights and measures; a standard authority as to nautical terms; standard gold or silver. 2. Hence: Having a recognised and permanent value; as, standard works in history; standard authors. 3. <botany> Not supported by, or fastened to, a wall; as, standard fruit trees. Not of the dwarf kind; as, a standard pear tree. Standard candle, Standard gauge. See Candle, and Gauge. Standard solution. <chemistry> See Standardized solution, under Solution. Source: Websters Dictionary (01 Mar 1998) |
| standard atmosphere | The pressure of the atmosphere at mean sea level, equivalent to 1,013,250 dynes/cm2 or 101,325 Pa (N/m2 in the SI system), a standardised expression of the relation of barometric pressure, temperature, and other atmospheric variables as a function of altitude above sea level. (05 Mar 2000) |