AVOCADO: A Virtual Observatory Census to Address Dwarfs Origins

Dwarf galaxies are by far the most abundant of all galaxy types, yet their properties are still poorly understood -especially due to the observational challenge that their intrinsic faintness represents. AVOCADO aims at establishing firm conclusions on their formation and evolution by constructing a homogeneous, multiwavelength dataset for a statistically significant sample of several thousand nearby dwarfs (-18 < Mi < -14). Using public data and Virtual Observatory tools, we have built GALEX+SDSS+2MASS spectral energy distributions that are fitted by a library of single stellar population models. Star formation rates, stellar masses, ages and metallicities are further complemented with structural parameters that can be used to classify them morphologically. This unique dataset, coupled with a detailed characterization of each dwar's environment, allows for a fully comprehensive investigation of their origins and to track the (potential) evolutionary paths between the different dwarf types.Comment: 4 pages, 1 figure. To appear in the proceedings of IAU Symposium 277, "Tracing the Ancestry of Galaxies on the Land of our Ancestors", Carignan, Freeman, and Combes, ed

Exploring hydrogen production for self-energy generation in electroremediation: A proof of concept

UID/AMB/04085/2019. PTDC/FIS-NAN/0909/2014. SFRH/BD/114674/2016. PD\BD \135170\2017.Electrodialytic technologies are clean-up processes based on the application of a low-level electrical current to produce electrolysis reactions and the consequent electrochemically-induced transport of contaminants. These treatments inherently produce electrolytic hydrogen, an energy carrier, at the cathode compartment, in addition to other cathode reactions. However, exploring this by-product for self-energy generation in electroremediation has never been researched. In this work we present the study of hydrogen production during the electrodialytic treatment of three different environmental matrices (briny water, effluent and mine tailings), at two current intensities (50 and 100 mA). In all cases, hydrogen gas was produced with purities between 73% and 98%, decreasing the electrical costs of the electrodialytic treatment up to ≈7%. A proton-exchange membrane fuel cell was used to evaluate the possibility to generate electrical energy from the hydrogen production at the cathode, showing a stable output (~1 V) and demonstrating the proof of concept of the process.authorsversionpublishe

Espécies de carrapatos relatadas no Estado de Mato Grosso do Sul.

Carrapatos são ectoparasitos do filo Arthropoda, classe Arachnida, ordem Acari e subordem Ixodida. Parasitam a grande maioria dos animais vertebrados e apresentam uma ampla distribuição geográfica. Estes parasitas causam relevantes prejuízos à saúde pública, por serem vetores de agentes patogênicos ao homem e aos animais, e são responsáveis por prejuízos econômicos na pecuária. O Estado de Mato Grosso do Sul está localizado ao sul da região Centro-Oeste e possui uma grande variedade de ecossistemas, incluindo cerrados e as terras inundáveis do Pantanal sul-mato-grossense. Das 61 espécies de carrapatos descritas no Brasil, apenas 20 espécies foram relatadas até o momento no Estado, espécies estas distribuídas nas famílias Ixodidae (quatro gêneros e 20 espécies) e Argasidae (dois gêneros e duas espécies). Neste contexto, animais domésticos tanto de companhia como de produção e silvestres frequentemente entram em contato podendo promover interações de interesses econômicos e de saúde pública. O presente trabalho pretende atualizar as informações disponíveis sobre as espécies de carrapatos presente no Estado de Mato Grosso do Sul.bitstream/item/71873/1/DOC196.pd