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Träfflista för sökning "WFRF:(Daniel M. K.) srt2:(1995-1999)"

Sökning: WFRF:(Daniel M. K.) > (1995-1999)

  • Resultat 1-4 av 4
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1.
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2.
  • Schäffer, Tilman E, et al. (författare)
  • Does abalone nacre form by heteroepitaxial nucleation or by growth through mineral bridges?
  • 1997
  • Ingår i: Chemistry of Materials. - : American Chemical Society (ACS). - 0897-4756 .- 1520-5002. ; 9:8, s. 1731-1740
  • Tidskriftsartikel (refereegranskat)abstract
    • We present experimental support for a model of abalone nacre growth that is based on mineral bridges between successive aragonite tablets rather than on heteroepitaxial nucleation. Interlamellar sheets of organic polymers delineate the aragonite tablets but allow the tablets to grow mineral bridges through pores in the sheets. Atomic force microscope images of interlamellar organic sheets from flat pearls made by Haliotis rufescens (red abalone; marine gastropod mollusk) reveal a fibrous core and holes of 5-50 nm in diameter. Scanning ion conductance microscopy shows that these holes are actually pores through the interlamellar sheets. With the help of statistical analysis we can associate the pore-to-pore spacings in the interlamellar sheets with the observed offsets of successive nacre tablets. These results, supplemented by AFM, SEM, and TEM images, support and extend the model of biofabrication of gastropod nacre which is based on mineral bridges between the aragonite tablets.
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3.
  • Bremer, Kåre, et al. (författare)
  • An ordinal classification for the families of flowering plants
  • 1998
  • Ingår i: ANNALS OF THE MISSOURI BOTANICAL GARDEN. - : MISSOURI BOTANICAL GARDEN. - 0026-6493. ; 85:4, s. 531-553
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Recent cladistic analyses are revealing the phylogeny of flowering plants in increasing detail, and there is support for the monophyly of many major groups above the family level. With many elements of the major branching sequence of phylogeny established
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4.
  • Lastras-Martí­nez, L. F., et al. (författare)
  • Reflectance difference spectroscopy of GaAs asymmetric surface quantum wells above the fundamental gap
  • 1998
  • Ingår i: Physica status solidi. A, Applied research. - 0031-8965 .- 1521-396X. ; 170:2, s. 317-321
  • Tidskriftsartikel (refereegranskat)abstract
    • We report Reflectance Difference (RD) measurement on (001) GaAs surface quantum wells (QW) under Ultra High Vacuum (UHV) conditions from 1.7 to 5.0eV. The QW is embedded between an arsenic-rich reconstructed GaAs surface and an AlAs barrier. The samples, grown by MBE with a protective arsenic cap layer, were heated to 320 and 430°C to desorb the As layer and form c(4 x 4) and (2 x 4) surface reconstructions, respectively. By modifying the surface reconstructure, we are able to separate the contributions to the optical anisotropy from the surface region (mainly associated with the As dimers) from those originating below the surface.
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  • Resultat 1-4 av 4

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