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Träfflista för sökning "WFRF:(Williamson T) srt2:(2000-2004)"

Sökning: WFRF:(Williamson T) > (2000-2004)

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1.
  • Dutta, D, et al. (författare)
  • Nuclear transparency with the gamma n ->pi(-)p process in He-4
  • 2003
  • Ingår i: Physical Review C (Nuclear Physics). - 0556-2813. ; 68:2: 021001
  • Tidskriftsartikel (refereegranskat)abstract
    • We have measured the nuclear transparency of the fundamental process gamman-->pi(-)p in He-4. These measurements were performed at Jefferson Lab in the photon energy range of 1.6-4.5 GeV and at theta(cm)(pi)=70degrees and 90degrees. These measurements are the first of their kind in the study of nuclear transparency in photoreactions. They also provide a benchmark test of Glauber calculations based on traditional models of nuclear physics. The transparency results suggest deviations from the traditional nuclear physics picture. The momentum transfer dependence of the measured nuclear transparency is consistent with Glauber calculations that include the quantum chromodynamics phenomenon of color transparency.
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2.
  • Zhu, LY, et al. (författare)
  • Cross-section measurement of charged-pion photoproduction from hydrogen and deuterium
  • 2003
  • Ingår i: Physical Review Letters. - 1079-7114. ; 91:2: 022003
  • Tidskriftsartikel (refereegranskat)abstract
    • We have measured the differential cross section for the gamman-->pi(-)p and gammap-->pi(+)n reactions at theta(c.m.)=90degrees in the photon energy range from 1.1 to 5.5 GeV at Jefferson Lab (JLab). The data at E(gamma)greater than or similar to3.3 GeV exhibit a global scaling behavior for both pi(-) and pi(+) photoproduction, consistent with the constituent counting rule and the existing pi(+) photoproduction data. Possible oscillations around the scaling value are suggested by these new data. The data show enhancement in the scaled cross section at a center-of-mass energy near 2.2 GeV. The cross section ratio of exclusive pi(-) to pi(+) photoproduction at high energy is consistent with the prediction based on one-hard-gluon-exchange diagrams.
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5.
  • Lindström, Fredrik, et al. (författare)
  • Solid state N-14 and P-31 MAS NMR: New tools to study electrostatic binding of peptides on biomembrane surfaces
  • 2004
  • Ingår i: BIOPHYSICAL JOURNAL. - 0006-3495. ; 86:1, s. 19A-19A
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • The effect of electrostatic peptide association via its basic residues on lipid headgroup orientation in biological lipid membranes was investigated by monitoring both 14N and 31P nuclear magnetic resonance (NMR) spectroscopy. Lipid membranes were in the liquid crystalline phase at 308K and consisted of anionic DMPG or cationic DDAB added to neutral DMPC at different ratios to but also by ternary lipid bilayers with zero nominal surface charge. The quadrupolar splitting of the 14N nucleus and the isotropic chemical shift value of the 31P nucleus shows a systematic response to changes in the surface electrostatic charge. Also by utilizing the naturally occurring spin reporters 14N and 31P both parts of the choline headgroup electric dipole P---N+(CH3)3 can be observed. This approach provides information about association between lipid bilayers and proteins but also changes in the headgroup surrounding electrostatic environment. Previous results indicate that the interaction between pentalysine, a highly basic peptide with five positive charges, and lipid membranes is purely electrostatic. By adding pentalysine to membranes at different ratios the response of the lipid headgroup to pure electrostatic peptide association could be determined.
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  • Resultat 1-6 av 6

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