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Munitz M.S.,National University of Entre Rios | Garrido C.E.,Agencia Nacional de Promocion Cientifica y Tecnologica | Gonzalez H.H.L.,CONICET | Gonzalez H.H.L.,University of Buenos Aires | And 5 more authors.
International Journal of Fruit Science | Year: 2013

Blueberries cv. Misty (2009) and cvs. Emerald, Jewel, and Misty (2010) were analyzed for mycoflora occurrence in the main production area of Argentina. Isolation frequencies and relative densities of the fungal species were statistically compared. Alternaria tenuissima was predominant and the potential presence of Alternaria toxins may pose a risk for blueberries consumption. This is the first report of Aspergillus flavus, Alternaria alternata, Alternaria vaccinii, Arthrinium phaeospermum, Cladosporium cladosporioides, Curvularia lunata, Epicoccum nigrum, Eurotium chevalieri, Fusarium graminearum, Fusarium semitectum, Fusarium verticillioides, Geotrichum candidum, Mucor racemosus, Penicillium citrinum, Trichoderma harzianum and Trichocladium spp. isolated from blueberries in Argentina. © 2013 Copyright Taylor & Francis Group, LLC.

The aim of this paper is to evaluate the effects of the anthropogenic modifications on the aquifer recharge in coastal dunes zones. The study area is San Clemente del Tuyú, at the marine littoral of the province of Buenos Aires, where the land use has generated significant modifications in the hydrological cycle. Three areas with different types of land use were defined, isophreatic maps were elaborated for the years 1976, 1987, 2006 and the groundwater volume for each survey was estimated. This information was integrated to a Geographic Information System (GIS). The obtained results show that there is a direct relationship between land use evolution and the amount of groundwater stored. The dune zone has reduced its areal distribution in detriment of urbanized areas, that behavior is related to the decrease of fresh water volumes stored in that area. In conclusion, the modifications in land use through the time are reflecting in the phreatic aquifer behavior. Recent detail studies demonstrate that the urbanization brings about the decrease of the water excesses infiltration possibilities, restricting the aquifer natural recharge areas and consequently, the available fresh water reserves. Therefore, for sustainable groundwater management it is necessary to develop a rational plan for land use by preservation of sectors without urbanization or establishing protected areas to facilitate the aquifer recharge.

Alvarez M.G.,Comision Nacional de la Energia Atomica | Lapitz P.,Agencia Nacional de Promocion Cientifica y Tecnologica | Ruzzante J.,Comision Nacional de la Energia Atomica
Corrosion Science | Year: 2012

This paper presents a comparison between the acoustic emission (AE) signals generated by the transgranular stress corrosion cracking (TGSCC) of Ag-10Au (at.%) single crystals and those originated by the intergranular stress corrosion cracking (IGSCC) of a polycrystalline silver-gold alloy under the same experimental conditions. No significant difference is found between the mean amplitude and rise-time of the AE signals registered during the propagation of TGSCC and those measured for IGSCC propagation. Results also show that the AE signals generated by either TGSCC or IGSCC propagation in three different alloys such as AISI 304 SS, α-brass and Ag-Au alloys show similar AE parameters and similar amplitude distribution. © 2011.

Rigacci L.N.,Agencia Nacional de Promocion Cientifica y Tecnologica | Rigacci L.N.,National University of Lujan | Giorgi A.D.N.,CONICET | Giorgi A.D.N.,National University of Lujan | And 4 more authors.
Environmental Monitoring and Assessment | Year: 2013

The lower portion of the Reconquista River is highly polluted. However, little is known about the state of the high and middle basins. The aims of this work were to assess the water quality on the high and middle Reconquista River basins and to determinate if the presence of a reservoir in the river has a positive effect on the water quality. We conducted a seasonal study between August 2009 and November 2010 at the mouth of La Choza, Durazno, and La Horqueta streams at the Roggero reservoir - which receives the water from the former streams - at the origin of the Reconquista River and 17 km downstream from the reservoir. We measured 25 physical and chemical parameters, including six heavy metal concentrations, and performed a multivariate statistical analysis to summarize the information and allow the interpretation of the whole data set. We found that the Durazno and La Horqueta streams had better water quality than La Choza, and the presence of the reservoir contributed to the improvement of the water quality, allowing oxygenation of the water body and processing of organic matter and ammonia. The water quality of the Reconquista River at its origin is good and similar to the reservoir, but a few kilometers downstream, the water quality declines as a consequence of the presence of industries and human settlements. Therefore, the Roggero reservoir produces a significant improvement of water quality of the river, but the discharge of contaminants downstream quickly reverses this effect. © 2013 Springer Science+Business Media Dordrecht.

Tramontina D.,Agencia Nacional de Promocion Cientifica y Tecnologica | Tramontina D.,National University of Cuyo | Tramontina D.,University of Mendoza | Ruestes C.,Agencia Nacional de Promocion Cientifica y Tecnologica | And 4 more authors.
Computational Materials Science | Year: 2014

Defective Tantalum monocrystals are expected to display a particularly rich behavior when stressed along different directions. Using molecular dynamics simulations, we model Ta monocrystals containing a single spherical void of different sizes, under uniaxial compression, for two empirical potentials. Differences on the yield point, dislocation generation and plastic heating are observed depending on the void size and stress direction, as distinct slip systems are activated, resulting in a variety of dislocation structures and mobilities. © 2014 Elsevier B.V. All rights reserved.

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