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 ?
A density gradient ultracentrifugal procedure for the isolation of the major lipoprotein classes from human serum.
Ultracentrifugal studies on serum and serum fractions.
Ultracentrifugal protein sedimentation diagram on normal human, cow, and horse serum.
The ultracentrifugal characterization and isolation of human blood lipids and lipoproteins with applications to the study of atherosclerosis.
When the HDLZ ultracentrifugal subfraction of plasma was reacted with purified phosphatidyl transfer protein, Sm LpA-I particles of ~45 kDa were generated that could be detected using Superose 6 HP-SEC (84).
Because the excess percentage of apo A-I in the d >1.21 kg/L fraction vs that in chromatographically isolated Sm LpA-I particles increased with increasing percentage of either, the apparent artifact of ultracentrifugal dissociation of apo A-I may reflect as yet poorly understood factors that reduce apo A-I binding affinity to bulk HDL in subjects with low HDL concentrations.
After triglyceride-rich lipoproteins are removed from the serum by ultracentrifugation against a solution with a density of 1.006 kg/L, apolipoprotein B-containing lipoproteins in the ultracentrifugal infranate are precipitated with heparin and Mn[Cl.sub.2], and the cholesterol in the heparin-Mn[Cl.sub.2] supernatant is measured by the Abell-Kendall method at CDC.
Values so obtained correlate well with values obtained with the heparin-[Mn.sup.2+] precipitation technique (r = 0.95, CV <5 in 66% of the subjects studied and between 5 and 10% in the remaining ones) or by ultracentrifugal separation (r = 0.82, CV <5 % in 80 % of the subjects studied and between 5 and 10% in the remaining ones).