Actividade antifúngica de extractos fenólicos do mel de Trás-os-Montes

O mel é considerado um produto alimentar benéfico e promotor de saúde, através da prevenção de doenças. Estas propriedades devem-se em parte a presença de compostos fenólicos (ácidos fenólicos e flavonóides) na sua composição

Multimodal emotion evaluation: a physiological model for cost-effective emotion classification

Emotional responses are associated with distinct body alterations and are crucial to foster adaptive responses, well-being, and survival. Emotion identification may improve peoples' emotion regulation strategies and interaction with multiple life contexts. Several studies have investigated emotion classification systems, but most of them are based on the analysis of only one, a few, or isolated physiological signals. Understanding how informative the individual signals are and how their combination works would allow to develop more cost-effective, informative, and objective systems for emotion detection, processing, and interpretation. In the present work, electrocardiogram, electromyogram, and electrodermal activity were processed in order to find a physiological model of emotions. Both a unimodal and a multimodal approach were used to analyze what signal, or combination of signals, may better describe an emotional response, using a sample of 55 healthy subjects. The method was divided in: (1) signal preprocessing; (2) feature extraction; (3) classification using random forest and neural networks. Results suggest that the electrocardiogram (ECG) signal is the most effective for emotion classification. Yet, the combination of all signals provides the best emotion identification performance, with all signals providing crucial information for the system. This physiological model of emotions has important research and clinical implications, by providing valuable information about the value and weight of physiological signals for emotional classification, which can critically drive effective evaluation, monitoring and intervention, regarding emotional processing and regulation, considering multiple contexts.publishe

SOPHIE velocimetry of Kepler transit candidates XVI. Tomographic measurement of the low obliquity of KOI-12b, a warm Jupiter transiting a fast rotator

We present the detection and characterization of the transiting warm Jupiter KOI-12b, first identified with Kepler with an orbital period of 17.86 days. We combine the analysis of Kepler photometry with Doppler spectroscopy and line-profile tomography of time-series spectra obtained with the SOPHIE spectrograph to establish its planetary nature and derive its properties. To derive reliable estimates for the uncertainties on the tomographic model parameters, we devised an empirical method to calculate statistically independent error bars on the time-series spectra. KOI-12b has a radius of 1.43$\pm$0.13$R_\mathrm{Jup}$ and a 3$\sigma$ upper mass limit of 10$M_\mathrm{Jup}$. It orbits a fast-rotating star ($v$sin$i_{\star}$ = 60.0$\pm$0.9 km s$^{-1}$) with mass and radius of 1.45$\pm$0.09 $M_\mathrm{Sun}$ and 1.63$\pm$0.15 $R_\mathrm{Sun}$, located at 426$\pm$40 pc from the Earth. Doppler tomography allowed a higher precision on the obliquity to be reached by comparison with the analysis of the Rossiter-McLaughlin radial velocity anomaly, and we found that KOI-12b lies on a prograde, slightly misaligned orbit with a low sky-projected obliquity $\lambda$ = 12.6$\stackrel{+3.0}{_{-2.9}}^\circ$. The properties of this planetary system, with a 11.4 magnitude host-star, make of KOI-12b a precious target for future atmospheric characterization.Comment: 19 pages, 10 figure

Produtos derivados da colmeia

Segundo Peris [1], 0 "pólen apícola" é o resultado da aglutinação do pólen das flores com néctar e substâncias salivares das abelhas, Apis mellifera, que o acumulam em cargas polínicas e que o homem utiliza após a colheita nos caça-pólens, ulterior secagem, limpeza e empacotamento. São diversos os investigadores que, actualmente, desenvolvem trabalho sobre as potencialidades e interesse terapêutico do pólen, desde 0 tratamento de rinites alégicas [2], à actividade como hepatoprotector [3], ao efeito antiaterogenico [6], e uma acção particularmente eficaz no tratamento de prostatites [4]. Admite-se ainda que o pólen possa ter uma acção antibiótica [5] e sobre o crescimento dos mamíferos [9]. Para alem destas características terapêuticas, são-lhe também reconhecidas excelentes características nutricionais, pelo que é recomendado em situações de carências alimentares

Gaussian Process modelling of granulation and oscillations in red-giant stars

The analysis of photometric time series in the context of transiting planet surveys suffers from the presence of stellar signals, often dubbed "stellar noise". These signals, caused by stellar oscillations and granulation, can usually be disregarded for main-sequence stars, as the stellar contributions average out when phase-folding the light curve. For evolved stars, however, the amplitudes of such signals are larger and the timescales similar to the transit duration of short-period planets, requiring that they be modeled alongside the transit. With the promise of TESS delivering on the order of $\sim\!10^5$ light curves for stars along the red-giant branch, there is a need for a method capable of describing the "stellar noise" while simultaneously modelling an exoplanet's transit. In this work, a Gaussian Process regression framework is used to model stellar light curves and the method validated by applying it to TESS-like artificial data. Furthermore, the method is used to characterize the stellar oscillations and granulation of a sample of well-studied \textit{Kepler} low-luminosity red-giant branch stars. The parameters determined are compared to equivalent ones obtained by modelling the power spectrum of the light curve. Results show that the method presented is capable of describing the stellar signals in the time domain and can also return an accurate and precise measurement of $\nu_\text{max}$, i.e., the frequency of maximum oscillation amplitude. Preliminary results show that using the method in transit modelling improves the precision and accuracy of the ratio between the planetary and stellar radius, $R_p/R_\star$. The method's implementation is publicly available.Comment: Accepted for publication in MNRAS; 12 pages, 10 figures, 2 table

Caracterização do mel de Trás-os-Montes

A história dos produtos da colmeia remonta a tempos imemoriais, sendo o mel o primeiro a ser utilizado pelo homem_ "Substância açucarada produzida pelas abelhas melíferas a partir do néctar das flores ou de secreções provenientes de outras partes vivas da planta ou que sobre ela se encontram e que as abelhas recolhem, transformam e combinam com substâncias especificas próprias, armazenam e deixam amadurecer no favo da colmeia (N.RE., 1969)

Caracterização do mel de Trás-os-Montes

A história dos produtos da colmeia remonta a tempos imemoriais, sendo o mel o primeiro a ser utilizado pelo homem_ "Substância açucarada produzida pelas abelhas melíferas a partir do néctar das flores ou de secreções provenientes de outras partes vivas da planta ou que sobre ela se encontram e que as abelhas recolhem, transformam e combinam com substâncias especificas próprias, armazenam e deixam amadurecer no favo da colmeia (N.RE., 1969)

Damaging flood risk in the Portuguese municipalities

Modeling and understanding the impact of climate change on flooding processes in Mediterranean climate areas, namely in southern Europe, is a complex endeavor, which must also consider exposure and vulnerability patterns. Assuming that vulnerability plays a relevant role in explaining the degree of loss due to natural hazards, the present research compares a flood-susceptibility index with a social-vulnerability index and a historical record of flood losses, both aggregated at the municipal level. The purpose of this research is to define municipal flood risk profiles that would rank the 278 municipalities and contribute to the strategic allocation of resources and flood risk management [...]info:eu-repo/semantics/publishedVersio

Estudo da actividade biológica do pólen do Parque Natural de Montesinho

O pólen é o elemento germinal masculino das plantas fanerogâmicas. Encontra-se na forma pulverulenta nas anteras florais situadas na parte terminal dos estames das flores