ultracentrifuge

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ultracentrifuge

 [ul″trah-sen´trĭ-fūj]
the centrifuge used in ultracentrifugation.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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.
Farlex Partner Medical Dictionary © Farlex 2012

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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

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.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

ul·tra·cen·tri·fuge

(ŭl'tră-sen'tri-fyūzh)
A high-speed centrifuge by means of which large molecules sediment at practicable rates.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
Preparative ultracentrifuges isolate or pellet biological particles, viruses, organelles, membranes and biomolecules such as DNA, RNA and lipoproteins.
Analytical ultracentrifuges use detection systems to monitor spinning samples in real time to determine sedimentation velocity and equilibrium used to determine shape and mass of macromolecules.
The analytical ultracentrifuge's ability to determine macromolecular thermodynamic properties and geometric properties, such as size, shape and density, within solutions a is valuable tool in the study of proteins.
Kendro, which instrumentation giant Thermo Electron plans to acquire (see IBO 1/31/05), developed a customer base with its Sorvall line of ultracentrifuge offerings and willingness to allow users to use competitors' rotors in its own systems as well as use its rotors in competitors' systems.
Precooled rotors were ultracentrifuged in either a Beckman L7-55 or a L8-55 ultracentrifuge that had been precooled to 10[degrees]C.
The proper position of the cut was determined empirically by pipetting either 1 or 0.23 mL of saline, as appropriate, into the correct-sized ultracentrifuge tube, slicing the tube, and then measuring the volume of saline in the top fraction using gravimetrically calibrated pipettes.
He added that the ultracentrifuge machines with the 60,000rpm power had merely been developed in the US and Japan before Iran.
As the market for bench-top systems grows, however, the demand for floor-standing, high-speed and ultracentrifuge systems is expected to decline.
The SORVALL Discovery SE floor model family of ultracentrifuges and micro-ultracentrifuges spans space-saving ultras and compact, whisper-quiet micro-ultras for every ultracentrifuge separation.