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Träfflista för sökning "WFRF:(Olsson Per) srt2:(1990-1999)"

Sökning: WFRF:(Olsson Per) > (1990-1999)

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1.
  • Anderson, Leif G., et al. (författare)
  • The effect of the Siberian tundra on the environment of the shelf seas and the Arctic Ocean
  • 1999
  • Ingår i: Ambio. - 0044-7447. ; 28:3, s. 270-280
  • Tidskriftsartikel (refereegranskat)abstract
    • The Tundra Ecology -94 expedition investigated inflow of inorganic and organic carbon to the shelf seas by river runoff, and its transformation by biochemical processes in seawater and sediment. In addition, anthropogenic radionuclides, 137Cs, 90Sr, and 239,240Pu, were studied in water and sediments. The distribution of dissolved inorganic carbon indicates that the majority of the Ob and Yenisey discharges flow into the Laptev Sea before entering the central Arctic Ocean. The sediment study shows that there is a marked difference in benthic oxygen uptake, efflux of dissolved inorganic carbon and nutrients between localities. 137Cs activity from the Chernobyl accident is 30% in the Barents, Kara, and Laptev Seas. 137Cs increased from 5-8 Bq m-3 in Barents Sea, 5-13 Bq m-3 in the Kara Sea to 8-15 Bq m-3 in the Laptev Sea, but with locally low concentrations at the river mouths. Corresponding values for 90Sr were 2.5, 3, and 4 Bq m-3, respectively.
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  • Käll, Per-Olov, et al. (författare)
  • Preparation and Crystal Structure of of U-Phase Ln3(Si3-xAl3+x)O12+xN2-x (x≈0.5, Ln=La,Nd)
  • 1991
  • Ingår i: Journal of Materials Chemistry. - 0959-9428 .- 1364-5501. ; 1:2, s. 239-244
  • Tidskriftsartikel (refereegranskat)abstract
    • U-phase Ln3(Si3 –xAl3 +x)O12 +xN2 –x(Ln = La, Nd) occurs as a crystalline phase in rare-earth sialon ceramics formed by devitrification of grain-boundary glasses at 1000–1400 °C. The crystal structure of Nd U-phase has been determined from Cu-Kα X-ray powder diffractometer data and refined by the Rietveld full-profile technique to RF= 0.028. The space group is P321 and the cell dimensions are a= 7.974(1)Å, c= 4.873(1)Å and V= 268.29 Å3. The structure is isomorphic with the La3Ga5GeO14 structure, and exhibits corner-shared layers of (Si,Al)(O,N)4 tetrahedra interconnected by AlO6 octahedra. The rare-earth cations occupy sites between the tetrahedral layers. Transmission electron microscopy and lattice imaging studies support the X-ray structural findings. The structural relationship of the U-phase to other nitrogen-containing ceramic phases is discussed.
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  • Ahlqvist, Jan, Birger, 1952-, et al. (författare)
  • Osseointegrated implants in edentulous jaws: a 2-year longitudinal study.
  • 1990
  • Ingår i: International Journal of Oral & Maxillofacial Implants. - 0882-2786 .- 1942-4434. ; 5:2, s. 155-163
  • Tidskriftsartikel (refereegranskat)abstract
    • Osseointegrated implants in 50 edentulous jaws were studied during a 2-year observation period. The implant survival rate was 89% in the maxillae and 97% in the mandibles. The marginal bone loss averaged 1.7 mm in the maxillae and 1.1 mm in the mandibles. Most of this bone loss occurred during the first year. The bone loss was greater in jaws with a preoperatively minor resorption of the alveolar ridge than in those with moderate or advanced resorption. The bone loss was also greater at the medially positioned implants than at those more posterior.
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  • ALM, PER, et al. (författare)
  • Neuroendocrine differentiation in male breast carcinomas
  • 1992
  • Ingår i: APMIS. - : Wiley. - 0903-4641 .- 1600-0463. ; 100:7-12, s. 720-726
  • Tidskriftsartikel (refereegranskat)abstract
    • The presence of neuroendocrine differentiation, as expressed by cellular chromogranin immunoreactivity, was investigated in paraffin‐embedded tissue material from 51 consecutive cases of male breast carcinoma. From six of these cases electron microscopic studies were included. Chromogranin‐immunoreactive cells were present in solid cords and delineated tubular structures. Ultrastructurally, dense core secretory granules could be detected. The expression of neuroendocrine differentiation was 45%, which is between two and eight times higher than reported for female breast carcinomas by other investigators. The present findings suggest that male breast carcinoma is an exclusive tumour disease showing both similarities and discrepancies when compared to its female counterpart.
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