Results 231 to 240 of about 17,657,684 (289)
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High Pressure Liquid Chromatography
Journal of Pharmaceutical Sciences, 1973Abstract Prior to 1967, liquid column chromatography (LCC) separations were not normally carried out in an optimum manner; for this reason, the technique was viewed as slow and inefficient (1–3). Consequently, other techniques such as thin-layer chromatography (TLC) and gas chromatography (GC) found favor.
A F, Michaelis +2 more
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Effects of high pressure in liquid chromatography
Journal of Chromatography A, 2005All the experimental parameters that the chromatographers are used to consider as constant (the column length and its diameter, the particle size, the column porosities, the phase ratio, the column hold-up volume, the pressure gradient along the column, the mobile phase density and its viscosity, the diffusion coefficients, the equilibrium constants ...
Martin, Michel, Guiochon, Georges
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High-pressure liquid chromatography of steroids
Journal of Chromatography A, 1979After a brief discussion of the merits and limitations of high-pressure liquid chromatography (HPLC) relative to other chromatographic methods, special problems in the application to steroids are discussed. Publications on HPLC of steroids are then discussed under the headings of individual classes, arranged generally in the order of increasing ...
E, Heftmann, I R, Hunter
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Densities of Liquid Silicates at High Pressures
Science, 1984Densities of molten silicates at high pressures (up to ∼230 kilobars) have been measured for the first time with shock-wave techniques. For a model basaltic composition (36 mole percent anorthite and 64 mole percent diopside), a bulk modulus K s of ∼230 kilobars and a pressure derivative ( dK
Rigden, Sally M. +2 more
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High pressure liquid chromatography of oligodeoxyribonucleotides
Biochimica et Biophysica Acta (BBA) - Nucleic Acids and Protein Synthesis, 1973Abstract A high pressure liquid chromatography system capable of resolving oligodeoxy-ribonucleotides of intermediate size is described. Columns filled with a pellicular weak anion exchanger consisting of a polymeric aliphatic amine permit the rapid resolution of small amounts of oligomers.
A F, Cook +6 more
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High-pressure liquid chromatography of peptides
Journal of Chromatography A, 1977Peptides varying in size from di- to decapeptide have been subjected to high-pressure liquid chromatography on Phenyl-Corasil, Poragel PN, and Poragel PS under reversed-phase conditions with acetonitrile-water mixtures. It has been found that residual silanol groups in the Phenyl-Corasil and the functional groups in the Poragels significantly influence
J J, Hansen +4 more
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High frequency dynamics in liquid Cs at high pressure
The Journal of Chemical Physics, 2009We report on an inelastic x-ray scattering investigation of the high frequency dynamics of liquid cesium at 493 K and 1 GPa, which corresponds to a density 23% higher than that at the room pressure melting point. The analysis of the spectra, performed within the framework of the memory function approach suggests the existence of two different ...
V. GIORDANO, MONACO G
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High-pressure liquid-liquid phase change in carbon
Physical Review B, 1993The likelihood of a first-order liquid-liquid phase change in carbon from a mostly graphitic configuration to one that is more tetrahedral in character is explored. Liquid-phase changes in other materials are noted. Pertinent data on liquid carbon are reviewed and the model is briefly described.
, van Thiel M, , Ree
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Photoinduced Reactivity of Liquid Ethanol at High Pressure
The Journal of Physical Chemistry B, 2010The room temperature photoinduced reactivity of liquid ethanol has been studied as a function of pressure up to 1.5 GPa by means of a diamond anvil cell. Exploiting the dissociative character of the lowest electronic excited states, reached through two-photon absorption of near-UV photons (350 nm), irreversible reactive processes have been triggered in
CEPPATELLI, MATTEO +3 more
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Dissociation of Liquid Silica at High Pressures and Temperatures
Physical Review Letters, 2006Liquid silica at high pressure and temperature is shown to undergo significant structural modifications and profound changes in its electronic properties. Temperature measurements on shock waves in silica at 70-1000 GPa indicate that the specific heat of liquid SiO2 rises well above the Dulong-Petit limit, exhibiting a broad peak with temperature that ...
Hicks, Damien +5 more
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