Electron microscopy ofMalassezia furfurin tinea versicolor
- 1 January 1967
- journal article
- Published by Oxford University Press (OUP) in Medical Mycology
- Vol. 5 (2), 134-137
- https://doi.org/10.1080/00362176785190251
Abstract
This electron microscope investigation of Malassezia furfur (parasitic phase) is basic information for taxonomic purposes. Skin was excised from lesions of tinea versicolor, fixed in paraformaldehyde and osmium tetroxide, and imbedded in Epon. Scales from tinea versicolor were fixed in (a) glutaraldehyde and osmium tetroxide and (b) potassium permanganate, post-fixed in uranyl acetate, and imbedded in Vestopal. Thin sections were stained with uranyl acetate and lead citrate. Filaments and conidia of M. furfur were examined at initial magnifications of 3,000 to 30,000. The walls of the filaments and conidia were thick, fibrous, and sculptured on their inner surfaces. Separation of cells was by fission of a cross wall. In the epidermis M. furfur was observed to lie inside and between the keratinized cells of the stratum corneum. Cette étude au microscope électronique de la morphologie de Malassezia furfur dans le pityriasis versicolor donne des informations importantes pour la taxonomie du champignon. Un fragment de l'épiderme a été fixé à la paraformaldéhyde et au tétroxyde d'osmium, puis inclus dans l'“Epon”. Des squames de la couche cornée fixées (1) à la glutaraldéhyde et au tétroxyde d'osmium et (2) au permanganate de potassium, ont été postfixées à l'acétate d'uranyle et incluses dans le “Vestopal”. Les coupes ultra-minces ont été colorées à l'acétate d'uranyl et au citrate de plomb. Les micrographies ont été prises à des grossissements initiaux allant environ jusqu'à 30.000 fois. Dans l'épiderme, M. furfur se trouve dans les couches superficielles et moyennes de la couche cornée, entre les cellules kératinisées et à l'intérieur de celles-ci. Les cellules fongiques ont une paroi épaisse et fibreuse, à face interne accidentée. Les cellules se séparent à la suite de la formation d'une closion; la partie externe de la paroi se rompt et persiste sous forme de collerette.Keywords
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