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Medulloblastoma (?) with epithelioid features (1983)

Azzarelli, B. ; Muller, J. ; Mirkin, L. D.

Springer

Acta neuropathologica 61 (1983), S. 109-115

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ISSN: 1432-0533

Keywords: Medulloblastoma ; Desmosomes ; Dense core vesicles ; Basement membrane ; Ependymoma

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary A midline cerebellar tumor in an 18-year-old male, on light microscopy composed of closely packed, small featureless cells with little cytoplasm, under electron microscopic examination showed distinct epithelial features. The cells were closely apposed and joined by zonula adherentes, puncta adherentia and classical desmosomes. The latter structure has not been described in unequivocal glial or neuronal tumors or in normal cells dervied from the neural tube in vertebrates, not even in ontogenesis. In many areas the tumor cells abut on extensive basement membranes. Although the majority of the cells were undifferentiated, we occasionally observed elements containing dense core vesicles, microtubules and cilia. In addition, typical astrocytes were identified. The presence of these features strongly favors the neuroectodermal origin of this neoplasm.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00697389

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Etude par Spectroscopie et Microscopie Raman de Phases Oxyde de Molybdène Déposé sur Alumines (1980)

Sombret, B. ; Dhamelincourt, P. ; Wallart, F. ; [et al.]

Chichester [u.a.] : Wiley-Blackwell

Journal of Raman Spectroscopy 9 (1980), S. 291-296

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ISSN: 0377-0486

Keywords: Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: Raman spectroscopy and microscopy have been used to study some catalysts: Mo supported on alumina. Different Mo species were found, depending upon the amount of molybdenum deposited on the carrier. At low coverages (4% wt MoO3) distorted molybdate tetrahedra were observed. Increasing the surface coverage resulted in the formation of a polymolybdate phase with octahedrally surrounded molybdenum. Additionally, ‘bulk MoO3’ appeared when amounts were above 16% wt MoO3. When the supports were washed during their preparation with aqueous NH4OH and HNO3 solutions, preferential formation of polymolybdate phase was observed. In case of washing with alkaline solution ‘free MoO3’ was also detected. Finally using the Raman microprobe MOLE, a map giving the distribution of the different species at the surface of support was obtained.

Additional Material: 7 Ill.