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  • practice
  • Although it is recommended practice to protect the column from potential sources of contamination, no such precautions were made in this study. (sigmaaldrich.com)
  • molecular
  • The small molecular weight compound p -aminobenzoic acid (pABA) is used to mark the mobile phase volume in the column, while the efficiency and peak symmetry of the pABA peak are indicators of the integrity of the packed bed. (sigmaaldrich.com)
  • Analysis of the solubilized SRIF receptor by gel exclusion chromatography on an AcA 34 Ultrogel column revealed that its molecular mass is approximately 400 kDa. (aspetjournals.org)
  • high
  • It was in the fifties and sixties that theoretical models were developed for IC for further understanding and it was not until the seventies that continuous detectors were utilized, paving the path for the development from low-pressure to high-performance chromatography. (wikipedia.org)
  • Hydrodynamic instruments are often marketed as high-speed or high-performance countercurrent chromatography (HSCCC and HPCCC respectively) instruments which rely on the Archimedes' screw force in a helical coil to retain the stationary phase in the column. (wikipedia.org)
  • granular
  • The active component of the column, the adsorbent, is typically a granular material made of solid particles (e.g. silica, polymers, etc.), 2-50 μm in size. (wikipedia.org)
  • Beads
  • Also, the beads of water that form and condense inside the waveguide change the characteristic impedance and frequency, degrading the signal. (wikipedia.org)
  • composition
  • 1. A process for controlling the deposition of pitch in a paper-making process, wherein there is incorporated into the paper-making composition a coated inorganic particulate material which comprises a clay mineral coated with an inorganic gel which adheres to the clay and which renders the surface of the particles of clay hydrophobic. (google.com)
  • made
  • From a manufacturer's perspective, such a column would be impossible to make and even if it could be made, such a column would be too costly to sell. (sigmaaldrich.com)
  • pore size
  • however, it was not until 1964, when J. C. Moore of the Dow Chemical Company published his work on the preparation of gel permeation chromatography (GPC) columns based on cross-linked polystyrene with controlled pore size, that a rapid increase of research activity in this field began. (wikipedia.org)