Theoretical Considerations on Cell Shape, Convection, and an Area Anomaly Pertinent to Developing a Moving Boundary Theory for Ultracentrifugation

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Description

The intuitive concept that a sector shaped centrifuge cell is free from convection is criticized. Not only is a form of convection present for a single sedimenting species, but a more insidious type occurs in a mixture having an appreciable Johnston-Ogston effect. Rather than striving for convection-free sedimentation, the proposal is to utilize if possible an apparently harmless type of convection occurring in a very thin annulus in order to avoid the convection extending between boundaries in a mixture. The requirement that the concentrations be independent of time meets this condition and yields a hyperbolic cell, which is approximated by … continued below

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32 pages : illustrations

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Trautman, Rodes July 8, 1952.

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  • Main Title: Theoretical Considerations on Cell Shape, Convection, and an Area Anomaly Pertinent to Developing a Moving Boundary Theory for Ultracentrifugation
  • Series Title: UCRL (Series)
  • Series Title: University of California Radiation Laboratory Reports
  • Added Title: University of California Radiation Laboratory Report UCRL-1869

Description

The intuitive concept that a sector shaped centrifuge cell is free from convection is criticized. Not only is a form of convection present for a single sedimenting species, but a more insidious type occurs in a mixture having an appreciable Johnston-Ogston effect. Rather than striving for convection-free sedimentation, the proposal is to utilize if possible an apparently harmless type of convection occurring in a very thin annulus in order to avoid the convection extending between boundaries in a mixture. The requirement that the concentrations be independent of time meets this condition and yields a hyperbolic cell, which is approximated by a sector cell placed in the rotor backwards. Simultaneously, area measurements and calculations involving the Johnston-Ogston anomaly are simplified because of the time independence.

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32 pages : illustrations

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Digitized from microopaque cards (1).

Includes bibliographic references (page 32)

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  • SuDoc Number: Y 3.At 7:22/UCRL-1869
  • Report No.: UCRL-1869
  • Accession or Local Control No: metadc1255502
  • Archival Resource Key: ark:/67531/metadc1255502

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  • July 8, 1952

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  • Feb. 5, 2022, 9:51 a.m.

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  • June 24, 2024, 6:09 p.m.

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Thumbnail image of item number 1 in: 'Theoretical Considerations on Cell Shape, Convection, and an Area Anomaly Pertinent to Developing a Moving Boundary Theory for Ultracentrifugation'.
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Trautman, Rodes. Theoretical Considerations on Cell Shape, Convection, and an Area Anomaly Pertinent to Developing a Moving Boundary Theory for Ultracentrifugation, report, July 8, 1952; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc1255502/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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