| SPF | skin protection factor; specific-pathogen free; spectrophotofluorometer; S-phase fraction; split pro... |
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| SUN | standard unit of nomenclature; serum urea nitrogen |
| BFUe | erythroid Burst Forming Unit |
| BFU | burst-forming unit |
| BFU-E | burst-forming unit, erythrocytes |
| SUN | Serum Urea Nitrogen |
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| SPF | Sun Protection Factor |
| BFU-E | Burst Forming Unit Erythrocyte |
| BFU-E | Burst Forming Unit--Erythroid |
| BFU-E | Burst-forming unit |
| setting sun sign | <clinical sign> Retraction of the upper lid without upgaze so that the iris seems to "set" below the lower lid; suggestive of neurologic damage in the newborn, but usually clears up without sequelae. See: Collier's sign, Epstein's sign. (05 Mar 2000) |
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| sun | <botany> See Sunn. 1. The luminous orb, the light of which constitutes day, and its absence night; the central body round which the earth and planets revolve, by which they are held in their orbits, and from which they receive light and heat. Its mean distance from the earth is about 92,500,000 miles, and its diameter about 860,000. Its mean apparent diameter as seen from the earth is 32' 4<sec/, and it revolves on its own axis once in 25 1/3 days. Its mean density is about one fourth of that of the earth, or 1.41, that of water being unity. Its luminous surface is called the photosphere, above which is an envelope consisting partly of hydrogen, called the chromosphere, which can be seen only through the spectroscope, or at the time of a total solar eclipse. Above the chromosphere, and sometimes extending out millions of miles, are luminous rays or streams of light which are visible only at the time of a total eclipse, forming the solar corona. 2. Any heavenly body which forms the center of a system of orbs. 3. The direct light or warmth of the sun; sunshine. "Lambs that did frisk in the sun." (Shak) 4. That which resembles the sun, as in splendor or importance; any source of light, warmth, or animation. "For the Lord God is a sun and shield." (Ps. Lxxiv. 11) "I will never consent to put out the sun of sovereignity to posterity. <medicine>" (Eikon Basilike) Sun and planet wheels See Sun and planet wheels, above. Under the sun, in the world; on earth. "There is no new thing under the sun." Sun is often used in the formation of compound adjectives of obvious meaning; as, sun-bright, sun-dried, sun-gilt, sunlike, sun-lit, sun-scorched, and the like. Origin: OE. Sunne, sonne, AS. Sunne; akin to OFries. Sunne, D. Zon, OS. & OHG. Sunna, G. Sonne, Icel. Sunna, Goth. Sunna; perh. Fr. Same root as L. Sol. 297. Cf. Solar, South. Source: Websters Dictionary (01 Mar 1998) |
| sun protection factor | A number on a scale (from 2 upwards) for rating sunscreens. Sunscreens with an spt of 15 or higher provide the best protection from the sun's harmful rays. (12 Dec 1998) |
| sun star | <zoology> See Sun star, under Sun. Source: Websters Dictionary (01 Mar 1998) |
| sun-struck | <medicine> Overcome by, or affected with, sunstroke; as, sun-struck soldiers. Source: Websters Dictionary (01 Mar 1998) |
| burst | 1. To fly apart or in pieces; of break open; to yield to force or pressure, especially to a sudden and violent exertion of force, or to pressure from within; to explode; as, the boiler had burst; the buds will burst in spring. "From the egg that soon Bursting with kindly rupture, forth disclosed Their callow young." (Milton) Often used figuratively, as of the heart, in reference to a surcharge of passion, grief, desire, etc. "No, no, my heart will burst, an if I speak: And I will speak, that so my heart may burst." (Shak) 2. To exert force or pressure by which something is made suddenly to give way; to break through obstacles or limitations; hence, to appear suddenly and unexpecedly or unaccountably, or to depart in such manner; usually with some qualifying adverb or preposition, as forth, out, away, into, upon, through, etc. "Tears, such as angels weep, burst forth." (Milton) "And now you burst (ah cruel!) from my arms." (Pope) "A resolved villain Whose bowels suddenly burst out." (Shak) "We were the first that ever burst Into that silent sea." (Coleridge) "To burst upon him like an earthquake." (Goldsmith) Origin: OE. Bersten, bresten, AS. Berstan (pers. Sing. Berste, imp. Sing. Baerst, imp. Pl. Burston, p.p. Borsten); akin to D. Bersten, G. Bersten, OHG. Brestan, OS. Brestan, Icel. Bresta, Sw. Brista, Dan. Briste. Cf. Brast, Break. 1. To break or rend by violence, as by an overcharge or by strain or pressure, especially. From within; to force open suddenly; as, to burst a cannon; to burst a blood vessel; to burst open the doors. "My breast I'll burst with straining of my courage." (Shak) 2. To break. "You will not pay for the glasses you have burst?" (Shak) "He burst his lance against the sand below." (Fairfax (Tasso)) 3. To produce as an effect of bursting; as, to burst a hole through the wall. Bursting charge. See Charge. Source: Websters Dictionary (01 Mar 1998) |
| burst forming unit | <haematology> A bone marrow stem cell lineage detected in culture by its mitotic response to erythropoietin and subsequent erythrocytic differentiation in about 12 mitotic cycles into erythrocytes. (18 Nov 1997) |
| burst number | The number of viral particles that emerge from a cell after a viralinfection has burst it open. (09 Oct 1997) |
| burst size | The number of phages produced by an infected cell. (05 Mar 2000) |
| respiratory burst | <biochemistry> Response of phagocytes to particles (particularly if opsonise d) and to agonists such as formyl peptides and phorbol esters, an enhanced uptake of oxygen leads to the production, by an NADH dependent system, of hydrogen peroxide, superoxide anions and hydroxyl radicals, all of which play a part in bactericidal activity. Defects in the metabolic burst, as in chronic granulomatous disease, predispose to infection particularly with catalase positive bacteria and are usually fatal in childhood. (27 Jun 1999) |
| metabolic burst | <biochemistry> Response of phagocytes to particles (particularly if opsonise d) and to agonists such as formyl peptides and phorbol esters, an enhanced uptake of oxygen leads to the production, by an NADH dependent system, of hydrogen peroxide, superoxide anions and hydroxyl radicals, all of which play a part in bactericidal activity. Defects in the metabolic burst, as in chronic granulomatous disease, predispose to infection particularly with catalase positive bacteria and are usually fatal in childhood. (27 Jun 1999) |
| spider-burst | Radiating dull red capillary lines on the skin of the leg, usually without any visible or palpable varicose veins, but nevertheless due to deep-seated venous dilation; sometimes referred to as skyrocket capillary ectasis. Origin: spiderweb + sunburst (05 Mar 2000) |
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