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Träfflista för sökning "WFRF:(Persson Stefan) srt2:(1982-1984)"

Sökning: WFRF:(Persson Stefan) > (1982-1984)

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1.
  • Jönsson, G., et al. (författare)
  • Natural radiative lifetimes in the 3 sns 1S0 and 3 snd 1D2 sequences of magnesium
  • 1984
  • Ingår i: Physical Review A. ; A30:5, s. 2429-2432
  • Tidskriftsartikel (refereegranskat)abstract
    • Natural radiative lifetimes have been determined in the determined in the 3 sns 1S0 (n=4-15) and the 3 snd 1D2 (n=3-15) sequences of Mg I employing a pulsed-laser system. The radiative lifetimes in the 1S0 sequence and of the higher members in the 1D2 sequence are unperturbed and scale as (n*)2.6 (where n* is the effective principal quantum number), while the lifetimes of the lower members in the 1D2 sequence are perturbed by the doubly excited 3p2 configuration. The measured lifetimes are compared with available theoretical calculations, and a very good agreement is obtained.
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2.
  • Rydén, Stefan, et al. (författare)
  • A scintillation camera technique for measurements of the reticuloendothelial function -Comparison of different methods for measuring RES function
  • 1982
  • Ingår i: European Journal Of Nuclear Medicine. - 0340-6997. ; 7, s. 16-21
  • Tidskriftsartikel (refereegranskat)abstract
    • A highly standardized 99mTc-sulphur colloid was used to evaluate reticuloendothelial system (RES)-function in the normal rat and after RE blockade by gelatin (Haemaccel). Activity distribution in the animals was measured with a scintillation camera technique. Total uptake of activity in the liver was estimated. From the time-activity curves over the liver, the phagocytic index (kphag) was evaluated. Estimation of the uptake rate of the labelled colloid into the liver and into other parts of the RES was also performed using a twocompartment model. Different methods of evaluation of RE function were compared. It was shown that for a proper estimation of the RE function, the whole uptake curve must be considered. Gelatin (Haemaccel) significantly reduced the total colloid uptake by the liver. The colloid uptake rate into the liver was also significantly reduced. Liver specimens after colloid injection were examined by light and electron microscopy showing vacuolation of hepatocytes and sinusoidal cells probably due to pinocytosis. The technique described enables functional studies of the RES. It has the advantage of noninvasive registrations and is based on the same technical facilities as used for routine liver scintigraphy.
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