from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A high-velocity centrifuge used in the separation of colloidal or submicroscopic particles.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A high-speed centrifuge, especially one free from convection that is used to separate colloidal particles.
- v. To submit a material to ultracentrifugation
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a high speed centrifuge used to determine the relative molecular masses of large molecules in high polymers and proteins
- v. subject to the action of an ultracentrifuge
Sorry, no etymologies found.
Perrin of Sorbonne for developing equilibrium sedimentation in colloidal solutions, a method which Svedberg later perfected in his ultracentrifuge.
His greatest achievement was, however, the construction of the ultracentrifuge, with which he studied not only the particle size distribution in gold sols but also determined the molecular weight of proteins, for example, hemoglobin.
Svedberg's investigations with the ultracentrifuge and Tiselius's electrophoresis studies (see Section 3.10) were instrumental in establishing that protein molecules have a unique size and structure, and this was a prerequisite for Sanger's determination of their amino-acid sequence and the crystallographic work of
Plenty of opportunity for sight gags, such as an unbalanced ultracentrifuge “walking” through a wall or the noob grad student accidentally setting her bench on fire.
And it turns out the only other ultracentrifuge in the building: also broken.
This weekend, I had a DNA prep in the ultracentrifuge.
The other half he poured into a density gradient tube, diluted it with cesium chloride, and inserted it into the ultracentrifuge.
In the ultracentrifuge the large molecules are put under the influence of centrifugal forces up to about 106 gravity.
He showed that the molecules of certain pure proteins are all of one size and demonstrated the use of the ultracentrifuge to show the presence of contaminants.
For the study of sedimentation he constructed his well-known ultracentrifuge, where large molecules in solution, such as proteins, carbohydrates, and high polymers have been investigated.