FRCH - I+D+i - GIDTAP::Artículos en revistas

Permanent URI for this collectionhttp://48.217.138.120/handle/20.500.12272/6151

Browse

Start date: 2018End date: 2019

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    PAHs contamination in edible gastropods from north Patagonian harbor areas
    (2018-08-10) Primost, Mónica A.; Commendatore, Marta Graciela; Torres, Pablo Javier; Bigatti, Gregorio
    PAHs are persistent pollutants released into the environment by fossil fuels burning and leak during petroleum operations. Associated with suspended particles upon entering marine ecosystem are accumulated by benthic fauna. Human exposure occurs mainly from ingestion such as gastropods consumption. The objective was to determine PAHs in sediments and in the marine gastropod Buccinanops globulosus in sites with different maritime and urban influences. In sampling sites located 20 km from the harbor, PAHs were non-detected; while in harbor gastropods, the level of PAH4 was exceeded according to international normative. Level of dibenzo[a,h]anthracene in sediments was between the ISQG and PEL. Since these are the first results of PAHs in edible gastropods in South America, we concluded that PAHs can be dangerous for consumers according to ingestion frequency. Integrative studies are necessary to evaluate the interaction among pollutants in maritime areas and the incidence in human health due to shellfish consumption.
  • Thumbnail Image
    Item
    Photosensitizing role of R-phycoerythrin red protein and ß-carboline alkaloids in Dye sensitized solar cell. Electrochemical and spectroscopic characterization
    (2019-11-13) Yañuk, Juan G.; Cabrerizo, Franco M.; Dellatorre, Fernando Gaspar; Cerdá, María F.
    Dye-sensitized solar cell (DSSC) technology represents a valuable source for renewable energy production. Although with a rather low conversion efficiency, the continuous improvement of the price/performance ratio is making this technology more competitive than other sources of electrical power generation. To date, one of the major challenges is the search of novel and low-cost photosensitizers, a key player in the overall photo-conversion process. Natural dyes have shown to be an excellent alternative that still needs to be further explored. In this work, the spectroscopic and electrochemical properties of two different families of naturally occurring pigments (i.e, ß-carboline alkaloids (ßCs) and the red protein R-phycoerythrin (R-PE)) as well as their role in DSSCs are addressed. DSSC assemblies show that R-PE represents a highly suitable photosensitizer showing quite a high stability with a relative high solar energy to electricity conversion efficiency (n=0.11%) when comparing with other recombinant proteins (n=0.30%). Algae extracts used without further purification showed herein the highest efficiencies. The latter fact has a concomitant positive effect on the overall production cost of these photovoltaic cells. Surprisingly, and despite their positive effect on the coating of the semiconductor surface, the use of ßCs as additive decreases the overall conversion efficiency of the R-PE based DSSCs evaluated. Data support the hypothesis these alkaloids would be blocking the incident UVB/UVA radiation.