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Träfflista för sökning "WFRF:(Perera J) srt2:(1996-1999)"

Sökning: WFRF:(Perera J) > (1996-1999)

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1.
  • Andersson Dunstan, Christina, et al. (författare)
  • Alphitol, a phenolic substance from Alphitonia zizyphoides which inhibits prostaglandin biosynthesis in vitro
  • 1998
  • Ingår i: Phytochemistry. - 0031-9422 .- 1873-3700. ; 48:3, s. 495-497
  • Tidskriftsartikel (refereegranskat)abstract
    • The new phenolic compound, 3,5-dihydroxy-4-methoxy phenethyl alcohol, named alphitol, and betulinic acid were isolated from the bark of Alphitonia zizyphoides. The chemical structure of alphitol was determined by mass spectrometry in combination with one and two dimensional NMR, including HMBC. Both compounds inhibited prostaglandin biosynthesis in vitro, alphitol with an IC50 value of 0.66 mM, which is of the same magnitude as acetyl salicylic acid.
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2.
  • Dias, E.W.B, et al. (författare)
  • Breakdown of the independent particle approximation in high-energy photoionization
  • 1997
  • Ingår i: Physical Review Letters. - 0031-9007. ; 78:24, s. 4553-4556
  • Tidskriftsartikel (refereegranskat)abstract
    • The independent particle approximation is shown to break down for the photoionization of both inner and outer nl (l > 0) electrons of all atoms, at high enough energy, owing to interchannel interactions with the nearby ns photoionization channels. The effect is illustrated for Ne 2p in the 1 keV photon energy range through a comparison of theory and experiment. The implications for x-ray photoelectron spectroscopy of molecules and condensed matter are discussed.
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3.
  • Hemmers, O, et al. (författare)
  • Beyond the dipole approximation: angular-distribution effects in valence photoemission
  • 1997
  • Ingår i: Journal of Physics B: Atomic, Molecular and Optical Physics. - 0953-4075. ; 30:21, s. L727-L733
  • Tidskriftsartikel (refereegranskat)abstract
    • Angular distributions of valence photoelectrons showing effects due to highermultipole photon interactions have been measured for the first time. Neon 2s and 2p photoemission exhibits effects beyond the dipole approximation throughout the 250 to 1200 eV photon-energy range studied. The results suggest that any photoemission experiment, on any sample, can be affected at relatively low photon energies, pointing to a general need for caution in interpreting angle-resolved-photoemission measurements.
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