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Descripción ultraestructural de Euglena pailasensis (Euglenozoa) del Volcán Rincón de la Vieja, Guanacaste, Costa Rica

Show simple item record Sánchez, Ethel Vargas, Maribelle Mora, Marielos Ortega, José María Serrano, Aurelio Freer, Enrique Sittenfeld, Ana 2016-05-09T17:47:58Z 2016-05-09T17:47:58Z 2004-03
dc.identifier.citation Sánchez, E., Vargas, M., Mora, M., Ortega, J., Serrano, A., Freer, E., & Sittenfeld, A. (2004). Descripción ultraestructural de Euglena pailasensis (Euglenozoa) del Volcán Rincón de la Vieja, Guanacaste, Costa Rica. Revista de Biología Tropical/International Journal of Tropical Biology and Conservation, 52(1), 31-40. es_CR
dc.identifier.issn 0034-7744
dc.identifier.issn 2215-2075
dc.description.abstract The euglenoids are unicellular eukaryotic flagellates living in a diversity of soils and aquatic environments and ecosystems. This study describes the ultrastructure of an euglenoid isolated from the surface of a boiling mud pool with temperatures ranging from 38 to 98°C and pH 2 - 4. The hot mud pool is located in Area de Pailas de Barro, Las Pailas, Rincón de la Vieja Volcano, Guanacaste, Costa Rica. The morphological characterization of the Euglena pailasensis was performed by SEM and TEM. It was determined that, although the euglenoid was obtained from an extreme volcanic environment, the general morphology corresponds to that of a typical member of Euglena of 30-45 μm long and 8-10 μm wide, with membrane, pellicle, chloroplasts, mitochondria, nucleus, pigments and other cytoplasmic organelles. E. pailasensis is delimited by a membrane and by 40 to 90 pellicle strips. It was observed up to 5 elongated chloroplasts per cell. The chloroplast contains several osmiophilic globules and a pyrenoid penetrated by few thylakoid pairs. The nutritious material is reserved in numerous small paramylon grains located at the center of the cell, mitocondria are characterized by the presence of crests in radial disposition toward the interior of the lumen. It was also observed around the external surface “pili” like filaments originating from the pellicle strips. There is no evidence for the presence of flagella in the ampulla (reservoir/canal area), a fact confirmed by negative staining, and a difference regarding other species of Euglena. The observed ultrastructural characteristics are not sufficient to explain the adaptation of this species to acid and hot environments. es_CR
dc.language.iso es es_CR
dc.publisher Revista de Biología Tropical es_CR
dc.subject protozoa es_CR
dc.subject euglenozoa es_CR
dc.subject euglenoid es_CR
dc.subject euglena es_CR
dc.subject ultrastructure es_CR
dc.subject termoresistent es_CR
dc.subject acid tolerant es_CR
dc.subject ultraestructura es_CR
dc.subject termorezistent es_CR
dc.subject tolerante ácido es_CR
dc.title Descripción ultraestructural de Euglena pailasensis (Euglenozoa) del Volcán Rincón de la Vieja, Guanacaste, Costa Rica es_CR
dc.type Article es_CR

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