ZIB

Hits per page

hits 1 - 2 | 2 hits

Sorting

Electronic Resource

Alzheimer paired helical filaments: a comparison with the twisted ribbon model (1995)

Pollanen, M. S. ; Markiewicz, P. ; Goh, M. C. ; [et al.]

Springer

Acta neuropathologica 90 (1995), S. 194-197

add to mindlist on the mindlist

Details

ISSN: 1432-0533

Keywords: Alzheimer's disease ; Paired helical filaments ; Electron microscopy ; Tau

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract To investigate if Alzheimer paired helical filaments (PHF) closely resemble twisted ribbons, as indicated by recent high-resolution ultrastructural studies, we compared physical models of twisted ribbons with electron microscopic images of PHF. Uranyl-acetate-stained, isolated PHF with one or two helical turns were compared with scale models of twisted ribbons with one and two helical turns rotated at different angles. The various rotations of the twisted ribbon model corresponded well with the different orientations of randomly dispersed PHF. The electron-dense regions of individual PHF turns previously thought to represent a cross-over site of paired filaments corresponded to the edge of the twisted ribbon when the ribbon was oriented perpendicular to the filament axis. These data indicate that the overall configuration of PHF is a twisted ribbon but does not exclude possible configuration restrictions due to an ordered arrangement of subunits.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00294320

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Photoreflectance characterisation of GaAs and GaAs/GaAIAs structures grown by MOCVD (1995)

Misiewicz, J. ; Jezierski, K. ; Sitarek, P. ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Advanced Materials for Optics and Electronics 5 (1995), S. 321-327

add to mindlist on the mindlist

Details

ISSN: 1057-9257

Keywords: photoreflectance spectroscopy ; MOCVD ; GaAs ; GaAIAs ; heterostructures ; quantum wells ; surface ; interface ; Kramers-Kronig analysis ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Electrical Engineering, Measurement and Control Technology , Physics

Notes: Epitaxial undoped and doped (Si and Zn) GaAs and GaAIAs layers as well as heterostructures of GaAs/GaAIAs have been grown in an atmospheric pressure, vertical MOCVD system. Room temperature photoreflectance (PR) has been applied to characterise the layers and heterostructures as well as multiple quantum wells. The surface- and interface-related PR has been studied by application of Kramers-Kronig analysis. A decomposition of the PR spectrum into spectra connected with the surface region and with the interface has been proposed.

Additional Material: 8 Ill.