En seis lugares de la península Ardley, isla Rey Jorge, se determinó la concentración supeificial y distribución vertical de 137Cs en el suelo y su acumulación en la cubierta vegetal de éste. La concentración superficial de I37Cs fluctuó entre 121 y 532 Bq m-2. Su gran variación en un área reduci...
137Cs areal concentration and vertical distribution were determined at six sites located on Ardley
Peninsula, King George lsland. The total 137Cs areal concentration ranges from 121 to 532 Bq m-2. Its high variation can be attributed to water runoff and soil erosiono A relatively high percentage ...
Redon F., Jorge
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Walkowiak B., Alan
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[Estudio preliminar de la flora liquénica del Parque Nacional "La Campana" : I. Resultados sistemáticos.]
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Estudio preliminar de la flora liquénica del Parque Nacional "La Campana" : I. Resultados sistemáticos.
The distribution of the yellow-green, sorediate lichen Flavoparmelia soredians within Torres del Paine National Park, and from some localities elsewhere in the Magellanic Region, is presented. The species is new to the Magellanic Region and has previously in South America only been reported from ...
Se presenta la distribución del liquen amarillo- verde y soredioso Flavoparmelia soredians en el Parque Nacional "Torres del Paine" y en algunas otras localidades de la Región de Magallanes. Esta es la primera cita para la región, y en Sudamérica la especie ha sido citada sólo para cuatro localid...
Densitometric analysis (HPTLC) was used to determine the concentrations of phenolic metabolites in thalli of different age in Umbilicaria antarctica Frey et Lamb. Usnic acid and atranorin concentrations are highest in individuals of the youngest age class and decrease towards the oldest age class...
In Usnea aurantiaco-atra (Jaq.) Bory, growing in the Antarctica, a monthly variation in the usnic acid content, in individual thalli, was studied by means of scanning densitometry (HPTLC). The higher accumulation rates were quantified from January to May; there was a significant decrease in the c...
The major secondary metabolites of 17 Antarctic lichen species were studied via macroextraction. The most frequently found compounds were usnic acid and atranorin. Two polysubstituted depsides were isolated from Lecania brialmontii, brialmontins 1 and 2; from Catillaria corymbosa a derivative of ...
Se estudiaron los metabolitos secundarios mayoritarios de 17 especies de líquenes antárticos mediante macroextracción. Los compuestos más frecuentes fueron el ácido úsnico y la atranorina. De Lecania brialmontii se aislaron dos interesantes dépsidos polisustituidos, la brialmontina 1 y la brialmo...
From Hypogymnia lugubris (Pers.) Krog, a lichen collected in Antarctica, atranorin, ergosterol peroxide, and physodic, physodalic, protocetraric and usnic acids were isolated.
De Hypogymnia lugubris (Pers.) Krog, un liquen recolectado en la Antártica, se aisló atranorina, peroxiergosterol y los ácidos fisódico, fisodálico, protocetrárico y úsnico.
The secondary metabolites of 12 species of Antarctic lichens belonging to various systematical groups hace been analyzed by macroextraction. The compounds were characterized by their physical and spectroscopic properties. Cladonia cornuta, C. lepidophora and Ochrolechia deceptionis were analyzed ...
Los metabolitos secundarios de 12 especies de líquenes antárticos, pertenecientes a variados grupos sistemáticos, han sido analizados vía macroextracción. Los compuestos fueron caracterizados por medio de sus propiedades físicas y espectroscópicas. Cladonia cornuta, C. lepidophora y Ochrolechia d...
In Usnea auratiaco-atra (Jacq.) Bory, a lichen species collected in the Antarctica, the gold content was determined by the cupellation methods, 317 ppb and 1089 ppb dry weight were found in the lichen samples. A possible mechanism to explain the metal accumulation is discussed.
En especímenes de Usnea auratiaco-atra (Jacq.) Bory, líquen recolectado en la Antártica, se estudió el contenido en oro por copelación. Se discute un posible mecanismo de acumulación del metal en esta especie liquénica.
