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Ultraestructura Del Paracoccidioides Brasiliensis En Cultivos De La Fase Levaduriforme

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Resumen

Se estudia la fase levaduriforme delParacoccidioides brasiliensis, agente de la blastomicosis sudamericana, con el microscopio electrónico.

El material fué aislado de esputo, lesiones mucocutáneas y ganglios linfáticos.

Se describe la pared celular con un espesor medio de 179 mµ, una membrana citoplasmática con actividad pinocítica, múltiples núcleos identificados en el microscopio de luz por la reacción de Feulgen y en el microscopio electrónico por la doble membrana y los poros nucleares, mitocondrias en número de 40 a 50 en las formas que esporulan, un retícilo endoplásmico escaso, vacuolas con contenido de alta densidad electrónica identificadas como lípidos y figuras mielínicas, aparentemente en íntima relación con las vacuolas osmiofílicas.

En las formas jóvenes elParacoccidioides es intensamente osmiofílico, disminuyendo posteriormente la misma a medida que el hongo empieza a esporular. Posteriormente aparece una zona central granulosa que crece hasta ocupar todo el hongo en las formas viejas.

Summary

The yeast-like phase ofParacoccidioides brasiliensis, agent of the South American blastomycosis has been studied with the electron microscope.

The material was taken from sputum, mucocutaneous lesions and lymph nodes.

There are described: The cell wall, with an average width of 179 mµ; the cytoplasmatic membrane with pinocytic activity; multiple nuclei, identified with a light microscope by Feulgen's reaction and electron microscopically by a double membrane and the nuclear pores; 40 or 50 mitochondria in budding forms; a few endoplasmic reticulum, vacuoles with high electronic density content, identified as lipids and myelin figures, apparently intimately related to the osmiophilic vacuoles were described.

In the young forms, theParacoccidioides is intensely osmiophilic, diminishing its osmiophilic density when the fungus begins the budding. Later on, a granulous central zone appears and begins to grow until it occupies the whole fungus in the old forms.

Résumé

On a étudié la phase levuriforme duParacoccidioides brasiliensis, agent de la blastomycose sud-américaine, au microscope électronique.

Le matériel fût isolé de crachats, de lesions mucocutanées et de ganglions lymphatiques.

On a décrit la paroi cellulaire, d'une largeur moyenne de 179 mµ; la membrane cytoplasmatique avec activité pinocytique; des multiples noyaux identifiés au microscope de lumière par la réaction de Feulgen et au microscope électronique par la double membrane et les pores nucléaires; 40 ou 50 mitochondries dans les formes de bourgeonnement; un reticulum endoplasmique limité; une très haute densité électronique dans les vacuoles, dans lesquelles on a trouvé des lipides et des figures myéliniques, apparemment en relation intime avec les vacuoles osmiophiliques.

Dans les jeunes formes leParacoccidioides est extrémement osmiophilique, diminuant postérieurement l'osmiophilie aussitôt que le champignon commence le bourgeonnement. Postérieurement une zone centrale granuleuse apparait et grandit jusqu'à occuper tout le champignon dans les vieilles formes.

Zusammenfassung

Die Hefe-Phase des Erregers der südamerikanischen Blastomykose,Paracoccidioides brasiliensis, wurde mit dem Elektronen-Mikroskop untersucht.

Das Material stammte aus Haut- und Schleimhautherden, Lymphdrüsen und Sputum.

Es werden beschrieben: die Zellwand, die 179 mµ misst, die zytoplasmatische Membran mit pinozytischer Aktivität; ferner werden zahlreiche Kerne beschrieben, die im Lichtmikroskop durch die Feulgen-Reaktion und im Elektronenmikroskop durch die doppelte Membran und die Kernsporen ausgezeichnet sind. Bei den sporenbildenden Formen sieht man darüber hinaus 40–50 Mitochondrien, ein geringes endoplasmisches Reticulum und elektronenoptisch sehr dichte Vakuolen, die als Lipoide und Myelinprofile aufgefasst werden; diese befinden sich offenbar in enger Beziehung zu den osmiophilen Vakuolen.

Im jugendlichen Stadium ist derParacoccidioides stark osmiophil, eine Eigenschaft die mit der beginnenden Sporenbildung langsam abnimmt. Später tritt eine zentrale körnige Zone auf, die bis zur Ausfüllung des gesammten Pilzes in den Altersformen anwächst.

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Carbonell, L.M., Pollak, L. Ultraestructura Del Paracoccidioides Brasiliensis En Cultivos De La Fase Levaduriforme. Mycopathologia et Mycologia Applicata 19, 184–204 (1963). https://doi.org/10.1007/BF02051247

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