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 ?
After ultracentrifugation, the top and bottom fractions were separated in the ultracentrifugation tube with a blade, using a tube slicer (Nuclear Supply Company), by cutting in the clear zone between the top and bottom fractions.
Because of the importance of delivery of accurate volumes of specimen to the ultracentrifugation tube and of wash solutions during the reconstitution steps for the land 0.
If the repeat measurements confirmed the original values and the recoveries were still out of the stated limits, suggesting the possibility of a reconstitution error, the specimen would be subjected to repeat ultracentrifugation.