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Digitale Medien

Phase gratings in the visible and near-infrared spectral range realized by metastable electronic states in Na2[Fe(CN)5NO] · 2H2O (1996)

Woike, Th. ; Haussühl, S. ; Sugg, B. ; [weitere]

Springer

Applied physics 63 (1996), S. 243-248

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ISSN: 1432-0649

Schlagwort(e): 42.40.Pa ; 42.70.Gi ; 42.70.Ln

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Phase and amplitude gratings in the visible and near-infrared spectral range can be written in SodiumNitro-Prusside (SNP), Na2[Fe(CN)5NO] · 2H2O, single crystals by optical excitation of infinitely long-living metastable electronic states, localized in the [Fe(CN)5NO]2− anions. Hence, its photorefractive effect does not depend on dopants or defects. The refractive index is modulated by more thanΔn = 1 × 10−3 in the red (632.8 nm) andΔn = 5 × 10−4 in the near-infrared region (1047 nm). The absorption coefficient is modulated by aboutΔα = 100 m−1 at 632.8 nm and 40 m−1 at 1047 nm. The wavelength dependence ofΔn can be explained by strong absorption bands in the ultraviolet considering Kramers-Kronig dispersive analysis. The time constant of the write-read-erase processes and the diffraction efficiencyη depend on light intensity, wavelength and polarization of the light with respect to the crystallographic axes. After excitation of the metastable states the indicatrix is modulated only along thea- andb-axis of the orthorhombic system.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01833793

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Digitale Medien

Trinucleate cells and the ultrastructural localisation of bovine placental lactogen (1987)

Wooding, F. B. P. ; Beckers, J. F.

Springer

Cell & tissue research 247 (1987), S. 667-673

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ISSN: 1432-0878

Schlagwort(e): Secretory granules ; Cell fusion ; Cell migration ; Immunocytochemistry ; Immunogold localisation ; Placenta ; Placental lactogen ; Trinucleate cell ; Cow

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Medizin

Notizen: Summary Bovine placental lactogen activity is shown by immunogold electron microscopy to be restricted to (a) the granules and the Golgi body from which they form in the bovine fetal trophectodermal binucleate cell, and (b) granules of similar size and staining reaction in trinucleate “giant” cells found in the maternal uterine epithelium throughout pregnancy. These results support the hypothesis that a fetal binucleate cell forms a maternal giant cell by migration to and fusion with a uterine epithelial cell.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00215761

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