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  • resolution
  • In order to cope with this problem, several new column designs including zigzag, saw-tooth and figure-8 patterns have been introduced and their performance was compared in terms of retention of the stationary phase (Sf), peak resolution (Rs), theoretical plate number (N) and column pressures. (pubmedcentralcanada.ca)
  • various
  • Among the various mobile phases evaluated, [acetonitrile-methanol(64:36)]-[25 mM tris(hydroxymethyl)aminomethane/pH 95:5) eluent systems produced the most satisfactory results. (usda.gov)
  • analyte
  • In CEC positive ions of the electrolyte added along with the analyte accumulate in the electrical double layer of the particles of the column packing on application of an electric field they move towards the cathode and drag the liquid mobile phase with them. (wikipedia.org)
  • approximation
  • In mathematics, the stationary phase approximation is a basic principle of asymptotic analysis, applying to oscillatory integrals I ( k ) = ∫ g ( x ) e i k f ( x ) d x {\displaystyle I(k)=\int g(x)e^{ikf(x)}\,dx} taken over n-dimensional space ℝn where i is the imaginary unit. (wikipedia.org)
  • aqueous
  • This thesis mainly focuses on the development of stationary phases for liquid chromatography based on zwitterionic sulfobetaine polymers.In the thesis, various ways to prepare zwitterionic polymers in an aqueous environment using reversible addition fragmentation chain transfer (RAFT) polymerization are described. (avhandlingar.se)
  • Aqueous and polymer phases were used in the development of a novel partitioning scale. (wikipedia.org)
  • Typically, when an aqueous solution is used to transport the sample through the column, the technique is known as gel-filtration chromatography, versus the name gel permeation chromatography, which is used when an organic solvent is used as a mobile phase. (wikipedia.org)
  • cells
  • ii) if it is triggered by biological heterogeneity by measuring mortality in stationary phase in populations fractionated into subpopulations of young, virgin cells, and replicatively older, non-virgin cells. (mpg.de)
  • We also discussed the results of a staining method to measure viability instead of measuring the number of cells able to exit stationary phase and form a colony. (mpg.de)
  • Finally, the staining method suggested that cells lost the capacity to exit stationary phase and to divide long before they died in stationary phase. (mpg.de)
  • A high percentage of cells are motile during exponential growth, and a few cells are motile during stationary phase. (wikipedia.org)
  • Some cells form involution bodies during stationary phase. (wikipedia.org)
  • The group discovered regulatory systems exclusive to cells in this non-growing state and found that mutants with greater fitness in stationary phase evolved and rapidly took over the cultures. (wikipedia.org)
  • alkyl
  • however, more recent studies focusing on orthogonality to traditional alkyl phases has invited even broader attention. (sigmaaldrich.com)
  • Fluorinated phases have been shown to exhibit greater ion-exchange character than their alkyl counterparts. (sigmaaldrich.com)
  • The positively charged ammonium ion of these molecules interact with the DNA and the alkyl chain, with the hydrophobic surface of the solid phase. (wikipedia.org)
  • rapidly
  • The main idea of stationary phase methods relies on the cancellation of sinusoids with rapidly varying phase. (wikipedia.org)
  • If, however, these same sinusoids have phases which change rapidly as the frequency changes, they will add incoherently, varying between constructive and destructive addition at different times. (wikipedia.org)
  • ionic
  • ILs are attractive stationary phase materials for GC, offering several benefits, including high polarity, high viscosity, and low vapour pressure as a result of their ionic nature, which helps to improve GC column coating. (chromatographyonline.com)
  • organic
  • The chemical flexibility of their organic part, and thermal stability of their inorganic part (3) all offer great potential for R&D researchers to develop new stationary phases based on ILs. (chromatographyonline.com)
  • However, organic solvents are slightly miscible with water and the characteristics of both phases change making it difficult to obtain pure hydrophobicity scale. (wikipedia.org)
  • form
  • The structure of a popular form of fluorinated phases, pentafluorophenylpropyl (PFP or F5), is shown in Figure 1 . (sigmaaldrich.com)
  • different
  • McGraw and Hill 2000 ) and thus may be under selection across different phases of the annual cycle. (wiley.com)
  • 2015 ). To be able to assess experimentally these two mechanisms for dispersed phase clustering, the topology of the flow structure in a turbulent flow must be detected and quantified across the different scales. (springer.com)
  • early
  • Shaw emphasizes how the early phase of printing in Calcutta marked a transition between print culture and a culture that depended on a race of scribes. (wikipedia.org)
  • This ncRNA is expressed in early logarithmic phase, but its level decreases into stationary phase. (wikipedia.org)
  • Contrary unlike other rotaries, the early Gnome engines like the Gnome Omega, Lambda and Delta used a unique arrangement of valves in order to eliminate pushrods that operated during the inlet phase of the combustion cycle on more conventional engines. (wikipedia.org)