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Träfflista för sökning "WFRF:(Graham I) srt2:(1990-1994)"

Sökning: WFRF:(Graham I) > (1990-1994)

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1.
  • Matveenko, L. I., et al. (författare)
  • The structure of the quasar 3C-345
  • 1992
  • Ingår i: Soviet Astronomy Letters. - Moscow : Rossijskaja akademija nauk / Russian Academy of Sciences. - 0320-0108. ; 18:6, s. 379-391
  • Tidskriftsartikel (refereegranskat)abstract
    • We study the fine structure of the quasar 3C 345 at a wavelength of 49 cm. The apparent size of the core and low-frequency variability are due to the opacity of the surrounding ionized medium and the electron density distribution. We find the distance dependence of the size and brightness temperature of the components. Relativistic plasma is being ejected into a cone, with vertex angle approximately 40-degrees in position -110-degrees. The jet consists of narrow twisted filaments.
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2.
  • Pennell, Roger I., et al. (författare)
  • Developmental regulation of a plasma membrane arabinogalactan protein epitope in oilseed rape flowers
  • 1991
  • Ingår i: Plant Cell. - : Oxford University Press (OUP). - 1040-4651 .- 1532-298X. ; 3, s. 1317-1326
  • Tidskriftsartikel (refereegranskat)abstract
    • We have identified and characterized the temporal and spatial regulation of a plasma membrane arabinogalactan protein epitope during development of the aerial parts of oilseed rape using the monoclonal antibody JIM8. The JIM8 epitope is expressed by the first cells of the embryo and by certain cells in the sexual organs of flowers. During embryogenesis, the JIM8 epitope ceases to be expressed by the embryo proper but is still found in the suspensor. During differentiation of the stamens and carpels, expression of the JIM8 epitope progresses from one cell type to another, ultimately specifying the endothecium and sperm cells, the nucellar epidermis, synergid cells, and the egg cell. This complex temporal sequence demonstrates rapid turnover of the JIM8 epitope. There is no direct evidence for any cell-inductive process in plant development. However, if cell-cell interactions exist in plants and participate in flower development, the JIM8 epitope may be a marker for one set of them.
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