Espécies florestais nativas e exóticas: comportamento silvicultural no planalto do Tapajós - Pará.

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Development of a Simple Methodology Using Meteorological Data to Evaluate Concentrating Solar Power Production Capacity

Evaluation of the Concentrating Solar Power capacity factor is critical to support decision making on possible regional energy investments. For such evaluations, the System Advisor Model is used to perform capacity factor assessments. Among the required data, information concerning direct normal irradiance is fundamental. In this context, the Engerer model is used to estimate direct normal irradiance hourly values out of global horizontal irradiance ground measurements and other observed meteorological variables. Model parameters were calibrated for direct normal irradiance measurements in Évora (Southern Portugal), being then applied to a network of 90 stations, part of the Portuguese Meteorological Service. From the modelled direct normal irradiance, and for stations that comprise 20 years of data, typical meteorological years were determined. Finally, to identify locations of interest for possible installations of Concentrating Solar Power systems, annual direct normal irradiance availabilities and the respective capacity factor, for a predefined power plant using the System Advisor Model, were produced. Results show annual direct normal irradiance availabilities and capacity factors of up to ~2310 kWh/m2 and ~36.2% in Castro Marim and in Faro, respectively. Moreover, this study supports energy policies that would promote Concentrating Solar Power investments in Southern Portugal (Alentejo and Algarve regions) and eastern centre Portugal (Beira Interior region), which have capacity factors above 30%

Transport of the smoke plume from Chiado’s fire in Lisbon (Portugal) sensed by atmospheric electric field measurements

The Chiado’s fire that affected the city centre of Lisbon (Portugal) occurred on 25th August 1988 and had a significant human and environmental impact. This fire was considered the most significant hazard to have occurred in Lisbon city centre after the major earthquake of 1755. A clear signature of this fire is found in the atmospheric electric field data recorded at Portela meteorological station about 8 km NE from the site where the fire started at Chiado. Measurements were made using a Benndorf electrograph with a probe at 1 m height. The atmospheric electric field reached 510 V/m when the wind direction was coming from SW to NE, favourable to the transport of the smoke plume from Chiado to Portela. Such observations agree with predictions using Hysplit air mass trajectory modelling and have been used to estimate the smoke concentration to be ~0.4 mg/m3. It is demonstrated that atmospheric electric field measurements were therefore extremely sensitive to Chiado’s fire. This result is of particular current interest in using networks of atmospheric electric field sensors to complement existing optical and meteorological observations for fire monitoring

Consumo de água e coeficiente de cultura (Kc) para macieiras em Vacaria - RS.

As principais regiões produtoras de maçã do sul do Brasil apresentam elevados índices pluviométricos. Entretanto, é comum a ocorrência de períodos de déficit hídrico durante o ciclo da cultura nessas regiões, principalmente no final da primavera e durante o verão, o que pode prejudicar a qualidade e a produtividade comercial dos frutos. Por essa razão, há uma demanda recente, por parte de produtores locais, pela instalação de sistemas de irrigação em suas áreas. Para isso, contudo, faz-se necessário conhecer o consumo de água e o coeficiente de cultivo da cultura (Kc). Os valores de Kc são empregados na estimativa da evapotranspiração da cultura (ETc), por meio da expressão ETc = Kc . ETo, em que ETo é a evapotranspiração de referência (ETo), calculada com base em dados meteorológicos. Embora existam dados de Kc para macieiras na literatura (ALLEN et al., 2006), nem sempre esses valores publicados se ajustam às condições locais. O objetivo do presente trabalho é determinar a necessidade hídrica e os valores de Kc para macieiras, sob as condições de Vacaria, RS.bitstream/item/31589/1/cot103.pd

New phototriggers based on coumarins with extended π-systems

Comunicação em painel P35 no XXIV Encontro Nacional da Sociedade de Portuguesa de Química, Coimbra, Portugal, 1-3 Julho 2015The present work describes the synthesis of new coumarin derivatives possessing an extended π-system, in order to bathocromically shift the wavelength of maximum absorption, and consequently of photolysis. These compounds were tested as phototriggers of two neurotransmitter amino acids, glycine and β-alanine, at 254, 300, 350 and 419 nm, in a Rayonet RPR-100 photochemical reactor, and the release of the active compound was monitored by HPLC-UV detection, with collection of kinetic data.Fundação para a Ciência e Tecnologia (FCT, Portugal) for financial support to the NMR portuguese network (PTNMR, Bruker Avance III 400-Univ. Minho), FCT and FEDER (European Fund for Regional Development) -COMPETE-QREN-EU for financial support to Research Centre of Chemistry, CQ/UM [PEst-C/QUI/UI0686/2013 (FCOMP -01-0124-FEDER-037302)]info:eu-repo/semantics/publishedVersio

Photorelease of neurotransmitter amino acids from coumarin derivatives

Comunicação em painel QS43 no livro de resumos do XX Encontro Luso-Galego de QuímicaIn this work it is presented the photorelease of two model neurotransmitter amino acids, namely glycine and β-alanine, from two different coumarins. These model neurotransmitters were chosen due to their biological importance as well as their pharmacological activities. The coumarin-amino acid conjugates were irradiated at 245, 300, 350 and 419 nm using a Rayonet RPR-100 photochemical reactor and the release of the active compound was monitored by HPLC-UV detection, with collection of kinetic data.Fundação para a Ciência e a Tecnologia (FCT

The cholesterol 24-hydroxylase activates autophagy and decreases mutant huntingtin build-up in a neuroblastoma culture model of Huntington’s disease

Objective Compromised brain cholesterol turnover and altered regulation of brain cholesterol metabolism have been allied with some neurodegenerative diseases, including Huntington’s disease (HD). Following our previous studies in HD, in this study we aim to investigate in vitro in a neuroblastoma cellular model of HD, the effect of CYP46A1 overexpression, an essential enzyme in cholesterol metabolism, on huntingtin aggregation and levels. Results We found that CYP46A1 reduces the quantity and size of mutant huntingtin aggregates in cells, as well as the levels of mutant huntingtin protein. Additionally, our results suggest that the observed beneficial effects of CYP46A1 in HD cells are linked to the activation of autophagy. Taken together, our results further demonstrate that CYP46A1 is a pertinent target to counteract HD progression.This work was supported by Brainvectis and E.rare: E-Rare Joint Transnational Call for Proposals 2017 “Transnational Research Projects for Innovative Therapeutic Approaches for Rare Diseases”. CN laboratory is supported by the French Muscular Dystrophy Association (AFM-Téléthon), the Ataxia UK, and the Fundação para a Ciência e Tecnologia (project ALG-01-0145-FEDER-29480 “SeGrPolyQ”). AM is supported by a Ph.D. fellowship from FCT (SFRH/BD/133192/2017)info:eu-repo/semantics/publishedVersio

LATTES: a novel detector concept for a gamma-ray experiment in the Southern hemisphere

The Large Array Telescope for Tracking Energetic Sources (LATTES), is a novel concept for an array of hybrid EAS array detectors, composed of a Resistive Plate Counter array coupled to a Water Cherenkov Detector, planned to cover gamma rays from less than 100 GeV up to 100 TeVs. This experiment, to be installed at high altitude in South America, could cover the existing gap in sensitivity between satellite and ground arrays. The low energy threshold, large duty cycle and wide field of view of LATTES makes it a powerful tool to detect transient phenomena and perform long term observations of variable sources. Moreover, given its characteristics, it would be fully complementary to the planned Cherenkov Telescope Array (CTA) as it would be able to issue alerts. In this talk, a description of its main features and capabilities, as well as results on its expected performance, and sensitivity, will be presented.Comment: Proceedings of the 35th International Cosmic Ray Conference (ICRC2017), Busan, South Korea. Presented by R. Concei\c{c}\~{a}o. 8 pages; v2: correct affiliation + journal referenc