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Structural and optical properties of epitaxial and bulk ZnO (2002)

Zeuner, A. ; Alves, H. ; Hofmann, D. M. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 80 (2002), S. 2078-2080

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: In this letter, we compare the properties of bulk and epitaxial ZnO. The ZnO thin films were grown on GaN templates and on ZnO single crystals by vapor phase deposition using Zn and NO2 as precursors. We use high-resolution x-ray diffraction to resolve the structural properties. The rocking curves of the bulk crystal are extremely broad caused by a mosaic structure of the substrate. The homoepitaxial ZnO film mimics the properties of the ZnO substrate whereas ZnO films on GaN templates showed superior rocking curve half width as small as 230 arcsec. The optical properties are investigated by temperature-dependent photoluminescence. Different donor and acceptor bound excitons can be distinguished for a half width of the recombination lines less than 1 meV. Free exciton emission is already detectable at liquid-He temperatures proofing the high quality of the epitaxial films. © 2002 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1464218

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CD95/CD95L interactions and their role in autoimmunity (2000)

Ricci-Vitiani, L. ; Conticello, C. ; Zeuner, A. ; [et al.]

Springer

Apoptosis 5 (2000), S. 419-424

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ISSN: 1573-675X

Keywords: apoptosis ; diabetes ; Fas ; organ-specific auto-immunity ; thyroiditis

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Abstract CD95 (Fas/Apo-1) is a broadly expressed death receptor involved in a variety of physiological and pathological apoptotic processes. Since its discovery, defects in CD95/CD95L system have been proposed as major pathogenic factors responsible for impaired immunological tolerance to self antigens and autoimmunity. Later, analysis of altered sensitivity to CD95-induced apoptosis in cells targeted by the immune response has revealed an unexpected role for CD95 and CD95L in organ-specific autoimmunity. CD95 has been shown to be expressed and functional in virtually all cell types that are target of the organ-specific autoimmune response. Here we review some of the major findings concerning the role of CD95 in autoimmunity, in dysfunctions due to increased or decreased CD95-induced apoptosis.