FRLP - I+D+i - CENTROS - LEMAC - TRABAJOS DE INVESTIGACIÓN

Permanent URI for this collectionhttp://48.217.138.120/handle/20.500.12272/1756

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Author: search.filters.author.García, Renato

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Now showing 1 - 6 of 6
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    Observations of the development of Xanthoria farinosa under optical and electron microscopy
    (Taylor & Francis, 2017) García, Renato; Rosato, Vilma
    Xanthoria farinosa is a foliose lichen widely distributed in South America, growing not only on rocks but also on man-made structures. This species has abundant soralia, but it is unknown how development occurs from the soredium to the formation of a complete thallus. The soredia were extracted from the thallus with forceps, planted on glass plates and exposed to outdoor conditions for a period of 24 months; in every 3 months, optical inspection was performed with a stereomicroscope and a compound microscope, in addition, four samples with different exposure times were chosen to observe under a scanning electron microscope. The development of hyphae and the adhesion of these to the substrate, and the outlines of the formation of the lobules and rhizines could be observed. Our study is a first attempt to understand the development of this species which is endemic to South America and very common in the area.
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    Biodegradation and biodeterioration of wooden Heritage, role of fungal succession
    (International Journal of Conservation Science, 2016) Alfieri, Paula; García, Renato; Rosato, Vilma; Correa, María
    Wood from heritage is usually attacked by wood-decay fungi generating mainly loss of dimensional and structural stability. The study of wood biodegradation process and its mechanism allow the obtaining of tools for wood conservation. In this paper, wood biodegradation and biodeterioration processes were studied in order to acquire a direct and visual indicator of the beginning of wood degradation. This indicator will allow the consolidation and protection of wood before it will be structurally compromised. Wood degradation conditions found in turntable were reproduced in laboratory by accelerated processes: environment degradation was developed by fluctuation cycles of humidity and temperature. Biological degradation was performed using wood decay fungus isolated from wooden heritage samples. The wood samples were inoculated with an equal amount of mycelia until abortive basidiomata emerged. The result analysis indicated that even though each species occupies particular niches, first settlers (environmental fungi) would generate a material more bioreceptive for wood decay fungi being replaced each other as dynamic communities. Consequently, environmental fungi allow the wood decay fungi to colonise and exploit better their ecological niche (succession). It was concluded that the appearance of first settlers is therefore a reliable visual indicator of the need of wood consolidation in order to preventing irreversibly wooden heritage loss.
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    Lichens growing on painted metal plates
    (Journal of Basic and Applied Research International, 2015) García, Renato; Correa, María; Rosato, Vilma
    This study was based on the description of different species of lichens which were growing on metal plates exposed to the weather conditions in La Plata, Buenos Aires Province, Argentina. Among the six species observed, Caloplaca cinnabarina was the most common. Lichen species were identified by observation under optical microscope and chemical reactions. The chemical composition of the paint was analyzed by IRS and the metal composition of the plates by SEM and EDS. SEM analysis also revealed paint cracking around the lichen and paint particles trapped in the thallus.
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    Nuevas citas de líquenes para la Reserva Natural de Punta Lara, provincia de Buenos Aires, Argentina
    (Revista del Museo Argentino de Ciencias Naturales, 2013) García, Renato; Rosato, Vilma
    Se realiza un listado, con características morfológicas de las nuevas citas de líquenes hallados en los muestreos realizados por los autores en la zona de selva ribereña de la Reserva Natural de Punta Lara. Se utilizaron caracteres morfológicos e histológicos y reacciones puntuales de color en conjunto con claves específicas para la identificación. Se agregan un total 10 especies, la mayoría de las especies encontradas son comunes para la provincia con la excepción de P. corallina que es una nueva cita para la provincia de Buenos Aires.
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    Clave de líquenes creciendo sobre cemento y hormigón en la provincia de Buenos Aires, Argentina
    (Grupo Latinoamericano de Liquenólogos, 2014) Rosato, Vilma; García, Renato
    Los líquenes crecen sobre una gran variedad de sustratos, entre estos los materiales fabricados por el hombre. Este trabajo se centra en los líquenes que son capaces de crecer sobre cemento. Se colectaron los líquenes hallados sobre hormigón, morteros de cemento y revoques de estructuras en áreas urbanas y rurales de varias localidades de la provincia de Buenos Aires. Las muestras se observaron bajo microscopio estereoscópico y óptico y además se realizaron las reacciones histoquímicas usuales y se observaron caracteres vegetativos y reproductivos. Se confeccionó una clave enfatizando las características que pueden verse a simple vista. Se registraron 28 especies de las cuales se presenta una pequeña descripción con caracteres adicionales no presentes en la clave.
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    Líquenes (Ascomycota liquenizados) de la reserva natural “Isla Martín García”, nuevos registros para la provincia de Buenos Aires y para Argentina
    (Fundación Miguel Lillo, 2015) García, Renato; Rosato, Vilma
    Nuevos registros para la provincia de Buenos Aires y para Argentina”. La Reserva Natural “Isla Martin García” se encuentra ubicada dentro del ambiente del Río de la Plata superior y cercana al límite sur del Delta del río Paraná. La isla, con una superficie aproximada de 168 ha, pertenece a la región fitogeográfica de la Selva Paranaense. Numerosos autores han descripto su vegetación, pero la mayoría de su liquenobiota es poco conocida ya que no existía una lista formal para ella. Se realizó un muestreo de tipo oportunista donde se colectaron líquenes epífitos sobre troncos y ramas, encontrándose un total de 50 especies. De estas 37 se encontraban citadas para la provincia de Buenos Aires, mientras que 8 son nuevos registros para la provincia de Buenos Aires y 5 son nuevos registros para Argentina. Todas ellas son especies que se encuentran en sectores tropicales y subtropicales de Argentina y Sudamérica, distribución coincidente con lo observado por otros autores para plantas vasculares.