| ultracentrifugation | <procedure> Centrifugation at very high g forces: used to separate molecules for example mitochondrial from nuclear DNA on a caesium chloride gradient. (18 Nov 1997) |
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| ultracentrifuge | A high-speed centrifuge (up to 100,000 rpm) by means of which large molecules, e.g., of protein or nucleic acids, are caused to sediment at practicable rates; used for determinations of molecular weights, separation of large molecules, criteria of homogeneity of large molecules, conformational studies, etc. (05 Mar 2000) |
| ultracytostome | Former name for micropore. Origin: ultra-+ G. Kytos, cell, + stoma, mouth (05 Mar 2000) |
| ultradian | Relating to biologic variations or rhythms occurring in cycles more frequent than every 24 hours. Compare: circadian, infradian. Origin: ultra-+ L. Dies, day (05 Mar 2000) |
| ultradian rhythm | See: ultradian. (05 Mar 2000) |
| ultradolichocephalic | Denoting a very long skull, one with a cephalic index of less than 65. (05 Mar 2000) |
| ultrafilter | A semipermeable membrane (collodion, fish bladder, or filter paper impregnated with gels) used as a filter to separate colloids and large molecules from water and small molecules, which pass through. (05 Mar 2000) |
| ultrafiltration | <procedure> Filtration under pressure. In the kidney, an ultrafiltrate is formed from plasma because the blood is at higher pressure than the lumen of the glomerulus. Also used experimentally to fractionate and concentrate solutions in the laboratory using selectively permeable artificial membranes. (18 Nov 1997) |
| ultrafiltration coefficient | The filtration coefficient of a semipermeable membrane. (05 Mar 2000) |
| ultrafiltration fermenter | An apparatus for continuous fermentation that is run inconjunctionwith a continuous microfiltration system to constantly remove thelow-molecular-weight product of the fermentation. (09 Oct 1997) |
| ultralente insulin | A form of zinc precipitated insulin in suspension in which the particle size is large, and thus release into the bloodstream after subcutaneous injection is slow; it can be mixed with other insulins having different particle sizes to achieve different durations of activity. Can be derived from porcine, bovine, or genetically engineered human type. (05 Mar 2000) |
| ultraligation | Ligation of a blood vessel beyond the point where a branch is given off. (05 Mar 2000) |
| ultramarine | <chemistry> A blue pigment formerly obtained by powdering lapis lazuli, but now produced in large quantities by fusing together silica, alumina, soda, and sulphur, thus forming a glass, coloured blue by the sodium polysulphides made in the fusion. Also used adjectively. Green ultramarine, a green pigment obtained as a first product in the manufacture of ultramarine, into which it is changed by subsequent treatment. Ultramarine ash or ashes, a pigment which is the residuum of lapis lazuli after the ultramarine has been extracted. It was used by the old masters as a middle or neutral tint for flesh, skies, and draperies, being of a purer and tenderer gray that produced by the mixture of more positive colours. Fairholt. Origin: Cf. Sp. Ultramarino. So called because the lapis lazuli was originally brought from beyond the sea, from Asia. Source: Websters Dictionary (01 Mar 1998) |
| ultramicroscope | <instrument, microscopy> A term applied to particles less than 0.1 ~m in diameter, hence too small to be truly resolved by the light micro- scope. Under the ultramicroscope they look like stars in the sky. Their differences in size are merely indicated by differences in brightness. (05 Aug 1998) |
| ultramicroscopic | <optics> Particles which, although visible in the ultramicroscope, are too small to be resolved by visible light. This places their size between 0.2 Lm and 0.005 Lm. (05 Aug 1998) |
| ultrafiltration |
Ultrafiltration is a filtration process in chemistry that can retain solutes with relative molecular masses in the order of 100s to 1000s.It is also used in haemodialysis to clean whole blood while keeping its composition intact. In biological terms this occurs at the barrier between the blood and the filtrate in the renal corpuscle or Bowman's capsule in the kidneys. The Bowman's capsule contains a dense capillary network called the glomerus. ...
출처: en.wikipedia.org/wiki/Ultrafiltration
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| ultramicroscope |
The ultramicroscope is a system of illumination for extremely small objects such as colloidal particles, fog droplets, or smoke particles. The objects are held in liquid or gaseous suspension in an enclosure with an intensely black background (usually a black body) and illuminated with a convergent pencil of very bright light entering from one side and coming to focus in the field of view - the "Tyndall cone" familiar in experiements on scattering. ...
출처: en.wikipedia.org/wiki/Ultramicroscope
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| ultramicrotome |
A microtome is a mechanical instrument used to cut very thin slices for microscopic examination. Most microtomes use a steel blade and are used to prepare sections of animal, plant or human tissues for histology. The most common applications of microtomes are: * Traditional histological technique: tissues are hardened by replacing water with paraffin. Sections are stained and examined with a visible light microscope. Sections are 2 to 10 micrometres thick. ...
출처: en.wikipedia.org/wiki/Ultramicrotome
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| ultraviolet |
----Ultraviolet (UV) radiation is electromagnetic radiation of a wavelength shorter than that of the visible region, but longer than that of soft X-rays. It can be subdivided into near UV (380–200 nm wavelength) and extreme or vacuum UV (200–10 nm). ...
출처: en.wikipedia.org/wiki/Ultraviolet
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| ultraviolet radiation |
----Ultraviolet (UV) radiation is electromagnetic radiation of a wavelength shorter than that of the visible region, but longer than that of soft X-rays. It can be subdivided into near UV (380–200 nm wavelength) and extreme or vacuum UV (200–10 nm). ...
출처: en.wikipedia.org/wiki/Ultraviolet_radiation
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| UL | on or relating to or characteristic of the region or peoples beyond the Alps from Italy (or north of the Alps) |
|---|---|
| UL | fanatical patriotism |
| UL | fanatically patriotic |
| UL | having frequencies above those of audible sound |
| UL | by ultrasonic means |
| UL | using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram) |
| UL | using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram) |
| UL | very high frequency sound |
| UL | (trade mark) a synthetic suede cloth |
| UL | radiation lying in the ultraviolet range |
| UL | having or employing wavelengths shorter than light but longer than X-rays |
| UL | radiation lying in the ultraviolet range |