ultracentrifuge


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ultracentrifuge

 [ul″trah-sen´trĭ-fūj]
the centrifuge used in ultracentrifugation.

ul·tra·cen·tri·fuge

(ŭl'tră-sen'tri-fyūj),
A high-speed centrifuge (up to 100,000 rpm) by means of which large molecules, for example, 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.

ultracentrifuge

(ŭl′trə-sĕn′trə-fyo͞oj′)
n.
A high-velocity centrifuge used in the separation of colloidal or submicroscopic particles.

ul′tra·cen·trif′u·gal (-trĭf′yə-gəl, -trĭf′ə-gəl) adj.
ul′tra·cen·trif′u·gal·ly adv.
ul′tra·cen′tri·fu·ga′tion (-fyo͝o-gā′shən) n.

ultracentrifuge

[ul′trəsen′trifyo̅o̅j]
Etymology: L, ultra, beyond; Gk, kentron, center; L, fugere, to flee
a high-speed centrifuge with a rotation rate fast enough to produce sedimentation of protein and viruses, even in blood plasma. Use of an attached microscope may make it possible to see the sediment.

ul·tra·cen·tri·fuge

(ŭl'tră-sen'tri-fyūj)
A high-speed centrifuge by means of which large molecules (e.g., of protein or nucleic acids) are caused to sediment at practicable rates.

ultracentrifuge

A device for rotating small containers at extremely high speed so as to expose the liquid contents to powerful centrifugal force, of the order of 100,000 g. Ultracentrifuges are used to separate particles of molecular size and determine molecular weights.

ultracentrifuge

a machine capable of spinning a rotor at speeds of up to 50 000 revolutions per minute, producing up to 500 000 g forces. The high speeds enable the separation of tiny particles, which are identified by the rate at which they move down the centrifuge tube. The unit of rate is called the Svedberg (S), after the inventor of the ultracentrifuge. Thus RIBOSOMES are found to consist of two subunits after ultracentrifugation, called 30S and 50S. See also DENSITY-GRADIENT CENTRIFUGATION, DIFFERENTIAL CENTRIFUGATION, MICROSOMAL FRACTION.

ul·tra·cen·tri·fuge

(ŭl'tră-sen'tri-fyūzh)
A high-speed centrifuge by means of which large molecules sediment at practicable rates.

ultracentrifuge,

n a high-speed centrifuge with a rotation rate fast enough to produce sedimentation of viruses, even in blood plasma. Many kinds of biochemical analyses use ultracentrifuge, including such analyses as the measurement and separation of some proteins and viruses.

ultracentrifuge

the centrifuge used in ultracentrifugation.
References in periodicals archive ?
Birmingham, AL) that uses the micro-sample preparative ultracentrifuge method to give you direct measurements of all lipoprotein components, including lipemic specimens.
Other methods to attain such information are cheaper and easier, such as polyacrylamide gel electrophoesis and gel permeation chromatography, but the ultracentrifuge provides more accurate results.
Improved detection of viruses by electron microscopy after direct ultracentrifuge preparation of specimens.
Tenders are invited for Delivery of gradient pcr cycles, Ultracentrifuge rotors and automatic gradient preparation and fractionation stations
As the market for bench-top systems grows, however, the demand for floor-standing, high-speed and ultracentrifuge systems is expected to decline.
Tenders are invited for Supply of Table Ultracentrifuge, Laboratory centrifuges and accessories
The MLA-50 High-Capacity Rotor for the Optima MAX-XP Tabletop Ultracentrifuge from Beckman Coulter offers a 194 mL capacity that allows more sample to be processed per run.
In the 1930s and '40s, Svedberg had developed the analytical ultracentrifuge which showed, unexpectedly, that proteins had well-defined masses, and Tiselius, who once described to me how he had inadvertently left his gardening shoes on when he went to hand out Nobel Prizes, had developed electrophoresis by which plasma proteins could be classified into 4 discrete groups (albumin and the famous [alpha], [beta], and [gamma] globulins).
The Optima MAX Personal Ultracentrifuge System has the first rotor to reach 1 million x g.
4 Ti fixed-angle rotor with a Beckman Coulter L8-80MR or L80-XP ultracentrifuge (Beckman Coulter) at 45 000 rpm for 11 h at 10[degrees]C, resulting in 218 068g.
Additionally, expensive equipment as an ultracentrifuge is no longer needed.
Tenders are invited for supply and installation of ultracentrifuge with accessories in accordance with the specifications given in the tender form.