RCAAP Repository
Relação entre responsabilidade social, empenhamento organizacional afectivo e percepção de apoio organizacional : um estudo exploratório
A presente investigação incide sobre o estudo da relação entre Responsabilidade Social (RS), Empenhamento Organizacional Afectivo e Percepção de Apoio Organizacional. Em particular, é estudada a relação entre a percepção de cinco dimensões de responsabilidade social – económica, legal, ética, discricionária para com os colaboradores e discricionária para com a comunidade –, e as outras duas variáveis em estudo. As hipóteses de investigação formuladas prevêem uma relação positiva significativa entre as variáveis, como também uma relação funcional entre as dimensões de RS e o empenhamento organizacional afectivo. É ainda explorada a hipótese de mediação desta relação pela percepção de apoio organizacional (POS), tendo por base explicativa a norma da reciprocidade. Para medir as variáveis em estudo foram utilizados a Escala de Cidadania Empresarial, a Escala de Empenhamento Organizacional Afectivo e o Questionário sobre Percepção de Apoio Organizacional. Estes foram aplicados a uma amostra de 66 trabalhadores de uma empresa da área da indústria e automação. Os resultados obtidos corroboram a relação funcional entre as dimensões de RS e o empenhamento organizacional afectivo, verificando-se o efeito de mediação. No final, tecem-se ainda algumas considerações sobre as limitações do presente estudo e futuras linhas de investigação.
Sistema político brasileiro no século XXI
O sistema político tem passado por diversas transformações ao longo dos anos. As concepções dos séculos passados não são mais aptas a descrever o atual modelo, principalmente num mundo interconectado e de sociedades hipercomplexas. Desse modo, faz-se necessária a análise e debate sobre o tema, com vista a identificar quais são os novos conceitos e se é possível melhorar o atual sistema político brasileiro. Para tanto neste trabalho procuramos apresentar as bases da formação do Estado de Direito, recorrendo à doutrina clássica, a exemplo de Maquiavel, Jean Bodin, Hobbes, Locke, Montesquieu e Rousseau, que ao longo da história formaram as bases dos sistemas políticos contemporâneos, analisando os elementos formadores do Estado moderno. Após essa fase propedêutica, investiga-se as bases do constitucionalismo e a viragem no século XX ocorrida para o Neoconstitucionalismo, aproveitando das lições de Dworkin e Alexy com o intuito de observar os critérios de distinção entre regras e princípios e como eles são aplicados nas decisões judiciais, em especial no cenário brasileiro no qual o protagonismo judiciário tem tomado cada vez mais proporções ativistas perante os outros poderes. Busca-se assim caminhar para que haja segurança jurídica e harmonia entre os poderes, através da observação e análise da jurisprudência do Supremo Tribunal Federal. Subsequentemente adentra-se à parte principal da pesquisa que busca verificar no sistema político brasileiro, sob a perspectiva comparada, possíveis metodologias, técnicas, experiências e alterações que podem ser executadas para promover uma melhora na qualidade democrática brasileira, aproximando o indivíduo de uma concreta participação na vida política.
2025-10-28T12:20:34Z
Araújo Filho, Gilson Dias de
A fraude no IVA e o regime definitivo sob a perspectiva portuguesa
A fraude fiscal é um tema cada vez mais relevante no contexto contemporâneo da União Europeia, especialmente por causa da modalidade fraude do operador fictício. Para combater a fraude no IVA, a Comissão Europeia lançou o Plano de Ação COM 148 (2016). O principal objetivo do presente trabalho foi verificar se a implantação do regime definitivo do IVA será medida eficiente para o combate à fraude e se esta medida resultará em melhorias para o Estado Português e para seus sujeitos passivos. A originalidade deste trabalho verifica-se na abordagem do novo regime definitivo como medida de prevenção à fraude fiscal no contexto de Portugal, transcendendo o Direito Fiscal e recorrendo às Ciências Comportamentais e Económicas. O método de investigação utilizado foi a análise qualitativa, documental, exploratória, através da pesquisa bibliográfica, jurisprudências e mass media mais recentes. Sob a ótica de Portugal, o regime de tributação no destino proposto pode trazer mais complexidade ao sistema IVA e também poderá causar variações na balança comercial. A proposta pode trazer riscos às micro, pequenas e médias empresas, especialmente quanto à facilidade de acesso ao estatuto do sujeito passivo certificado, aos custos de conformidades, à desvantagem competitiva, à complexidade e à possível intensificação do “efeito de limiar”. Assim, o principal contributo científico desta investigação foi demonstrar que a implantação do regime definitivo provavelmente não cumprirá o seu papel de forma eficiente no combate à fraude, pois tornará o sistema IVA mais complexo e alterará apenas o tipo de fraude a ser executada pelos sujeitos passivos de má-fé. É improvável também que o regime definitivo resulte em melhorias significativas para o Estado Português e para os seus sujeitos passivos.
2025-10-28T12:19:54Z
Santana, Ricardo Paranhos de
Evidence on the contribution of community gardens to promote physical and mental health and well-being of non-institutionalized individuals: a systematic review
Introduction: There has been growing interest in community gardens as an effective and affordable health promotion strategy. However, most available evidence is derived from qualitative studies, whereas quantitative research on this subject is limited. Objectives: To synthetize the literature about physical and mental health outcomes associated with community gardening. Two main questions were addressed: a) is there evidence, from quantitative studies, that community gardening is associated to physical and mental health and well-being of non-institutionalized individuals? b) Does community gardening provokes any discomfort in terms of physical health, i.e., bodily pain, to their beneficiaries? Methods: A systematic review of the literature was carried out following PRISMA guidelines by searching relevant electronic databases (PubMed, Scopus, and Web of Science). Empirical, quantitative studies published in English with no restrictions concerning the date of publication were considered eligible. The quality of the evidence was appraised using the tool developed by the National Heart, Lung, and Blood Institute of the National Institutes of Health for Observational Cohort and Cross-Sectional Studies. Results: Overall, 8 studies were considered eligible, of which seven studies were rated as having good methodological quality (one scored as fair). Community gardeners had significantly better health outcomes than their neighbours not engaged in gardening activities in terms of life satisfaction, happiness, general health, mental health, and social cohesion. Conclusion: Community gardens are associated to health gains for their users, irrespective of age, being an affordable and efficient way of promoting physical and mental health and well-being. To encourage the design, maintenance, and prospective evaluation of supportive urban environments promoting healthy and, at the same time, sustainable lifestyles, is essential to achieve public health gains and environmental sustainability.
2025-10-28T12:29:54Z
Lampert, Tarsila Costa, Joana Santos, Osvaldo Sousa, Joana Ribeiro, Teresa Freire, Elisabete
Analytical assessment and nutritional adequacy of school lunches in Sintra’s public primary schools
School meals present several cost benefits overtime at the short, medium, and long term for individuals and society. This cross-sectional study aims to analyse the nutritional composition and evaluate the adequacy of school lunches. One hundred and fifty-eight samples were collected and analysed from 10 primary schools in Sintra's municipality, served during one week. On average, energy (27.7% daily energetic requirements) and carbohydrate (48.1%) contents did not reach the reference values, and the content of protein (19.5%) exceeded the reference value (p < 0.05). The mean total fat (28.8%) and saturated fatty acids (5.4%) content complied with the recommendations. The mean salt (1.7 g) and dietary fibre (8.3 g) content exceeded the reference value but did not differ significantly from the recommendations. Addressing school canteens is crucial, not only in a nutritional approach, but also as an opportunity to achieve healthier, sustainable, and accessible food systems, aligned with the Sustainable Development Goals 2030. We highlighted the importance of evaluating evidence-based practices and disseminated practice-based evidence regarding the adequacy of school lunches.
2025-10-28T12:22:34Z
Nogueira, Telma Ferreira, Raquel J. Silva, Vitória Dias da Liñan Pinto, Mariana Damas, Carlos Sousa, Joana
Low-intensity shock wave therapy for the treatment of vasculogenic erectile dysfunction: a narrative review of technical considerations and treatment outcomes
Erectile dysfunction (ED) impacts a significant portion of the aging male population. Standard treatments such as oral medications, intracavernosal injections, intraurethral suppositories, vacuum erection aids, and penile prosthesis placement have stood the test of time. Recently, there has been a growing interest in the concept of regenerative medicine with the goal of restoring or renewing functional tissue. Low intensity shock wave therapy (LiSWT) is one example of a regenerative therapy. A strong body of basic science data suggests that shockwaves, when applied to local tissue, will encourage blood vessel and nerve regeneration. Clinical evidence supports the use of LiSWT to treat conditions ranging from ischemic heart disease, musculoskeletal injuries, and even chronic non-healing wounds. LiSWT is also being used to treat male sexual dysfunction conditions such as Peyronie's Disease and ED. The first studied application of LiSWT for ED was published in 2010. Since then multiple randomized, sham-controlled trials have sought to evaluate outcomes for this novel therapy in men with vasculogenic ED. Additionally, several meta-analyses are available with pooled data suggesting that LiSWT results in a significantly greater improvement in erectile function relative to sham-control. Despite these promising findings, the current body of literature is marred by significant heterogeneity relating to treatment protocols, patient populations, and follow-up duration. Further work is necessary to determine optimal device technologies, patient characteristics, and treatment duration prior to considering LiSWT as standard of care for men with ED.
2025-10-28T12:19:40Z
Simoes de Oliveira, Pedro Ziegelmann, Matthew
Tecnopolíticas da participação - uma abordagem genealógica
O desenvolvimento tecnológico é indissociável da sua implicação ética e política. Identificados importantes dilemas da participação na cidade contemporânea – a captura da partilha de decisões em processos autoritários, a abertura tanto verdadeira como ilusória que a cultura digital propicia para a autonomia de indivíduos e coletivos –, considera-se que a lente da tecnopolítica pode ser útil para compreender seu percurso histórico, contextualizar sua condição contemporânea e permitir uma apreciação mais informada das escolhas para o futuro. Nesse sentido, procurou-se construir uma narrativa sobre as tecnopolíticas da participação através de um estudo genealógico, identificando orientações teóricas, experiências práticas, marcos legais e históricos, a partir de literatura de referência, compilações de práticas e sítios eletrônicos de projetos e de autores. O resultado é uma linha do tempo, disponibilizada de forma online e interativa, na qual identificou-se cinco marcos, tendo em conta as principais inovações tecnopolíticas observadas: participação para a cidadania, participação para a autonomia, participação comunitária, participação institucionalizada e participação em rede. O estudo reforça o papel crucial da informação no desenvolvimento das tecnopolíticas da participação e ressalta oportunidades e desafios que a participação em rede oferece para a sua democratização.
2025-10-28T12:15:39Z
Carvalho Farias, Ana Carolina Paio, Alexandra Falanga, Roberto
Assessment and impact of the risk of exposure of Portuguese biomedical scientists in the context of COVID-19
Currently, the main public health concern worldwide is the COVID-19 pandemic, caused by SARS-CoV-2, which was recently discovered and described. Due to its high pathogenicity and infectiousness, it is necessary to determine the risk healthcare professionals face every day while dealing with infected patients and contaminated biological samples. The purpose of this study was to assess Portuguese Biomedical Scientists' risk of COVID-19 exposure and related stress appraisals. One hundred and forty participants completed online versions of the WHO's Risk Assessment and Management of Exposure Survey and the Stress Appraisal Measure. Participants worked mainly in outpatient settings (45%), and in emergency services (28%). Twenty three percent of participants were exposed to COVID-19 through community exposure, and 39% through occupational exposure. Although 95% reported using personal protective equipment (PPE), 83.6% were at high risk of infection. However, the use of some types of PPE was related to the risk of exposure. Participants reported moderate perceptions of stress and threat, but also moderate perceptions of control over the situation. These results may contribute to a more efficient risk management of these professionals and prevent disease transmission in hospitals and communities.
2025-10-28T12:08:55Z
Tavares, Ana Sofia R. Bellém, Fernando Abreu, Renato Leitão, Céu Medeiros, Nuno Alves, Patrícia Calmeiro, Luis
Impact of atrial fibrillation on outcome in Takotsubo syndrome: data from the International Takotsubo Registry
Background Atrial fibrillation (AF) is a major risk factor for mortality. The prevalence, clinical correlates, and prognostic impact of AF in Takotsubo syndrome (TTS) have not yet been investigated in a large patient cohort. This study aimed to investigate the prevalence, clinical correlates, and prognostic impact of AF in patients with TTS. Methods and Results Patients with TTS were enrolled from the International Takotsubo Registry, which is a multinational network with 26 participating centers in Europe and the United States. Patients were dichotomized according to the presence or absence of AF at the time of admission. Of 1584 patients with TTS, 112 (7.1%) had AF. The mean age was higher (P<0.001), and there were fewer women (P=0.046) in the AF than in the non-AF group. Left ventricular ejection fraction was significantly lower (P=0.001), and cardiogenic shock was more often observed (P<0.001) in the AF group. Both in-hospital (P<0.001) and long-term mortality (P<0.001) were higher in the AF group. Multivariable Cox regression analysis revealed that AF was independently associated with higher long-term mortality (hazard ratio, 2.31; 95% CI, 1.50-3.55; P<0.001). Among patients with AF on admission, 42% had no known history of AF before the acute TTS event, and such patients had comparable in-hospital and long-term outcomes compared with those with a history of AF. Conclusions In patients presenting with TTS, AF on admission is significantly associated with increased in-hospital and long-term mortality rates. Whether antiarrhythmics and/or cardioversion are beneficial in TTS with AF should thus be tested in a future trial.
2025-10-28T12:14:42Z
El‐Battrawy, Ibrahim Cammann, Victoria L. Kato, Ken Szawan, Konrad A. Di Vece, Davide Rossi, Aurelio Wischnewsky, Manfred Hermes‐Laufer, Julia Gili, Sebastiano Citro, Rodolfo Bossone, Eduardo Akin, Ibrahim Templin, Christian Neuhaus, Michael Franke, Jennifer Meder, Benjamin Jaguszewski, Milosz Noutsias, Michel Knorr, Maike Heiner, Susanne D’Ascenzo, Fabrizio Dichtl, Wolfgang Burgdorf, Christof Kherad, Behrouz Tschöpe, Carsten Sarcon, Annahita Shinbane, Jerold Rajan, Lawrence Michels, Guido Pfister, Roman Cuneo, Alessandro Jacobshagen, Claudius Karakas, Mahir Koenig, Wolfgang Pott, Alexander Meyer, Philippe David Arroja, Jose Banning, Adrian Cuculi, Florim Kobza, Richard Fischer, Thomas A. Vasankari, Tuija Airaksinen, K. E. Juhani Napp, L. Christian Budnik, Monika Dworakowski, Rafal MacCarthy, Philip Kaiser, Christoph Osswald, Stefan Galiuto, Leonarda Chan, Christina Bridgman, Paul Beug, Daniel Delmas, Clément Lairez, Olivier Gilyarova, Ekaterina Shilova, Alexandra Gilyarov, Mikhail Kozel, Martin Tousek, Petr Winchester, David E. Galuszka, Jan Ukena, Christian Poglajen, Gregor Carrilho-Ferreira, Pedro Hauck, Christian Paolini, Carla Bilato, Claudio Kobayashi, Yoshio Prasad, Abhiram Rihal, Charanjit S. Liu, Kan Schulze, P. Christian Bianco, Matteo Jörg, Lucas Rickli, Hans Pestana, Gonçalo Nguyen, Thanh H. Böhm, Michael Maier, Lars S. Pinto, Fausto J. Widimský, Petr Felix, Stephan B. Opolski, Grzegorz Braun‐Dullaeus, Ruediger C. Rottbauer, Wolfgang Hasenfuß, Gerd Pieske, Burkert M. Schunkert, Heribert Thiele, Holger Bauersachs, Johann Katus, Hugo A. Horowitz, John D. Di Mario, Carlo Münzel, Thomas Crea, Filippo Bax, Jeroen J. Lüscher, Thomas F. Ruschitzka, Frank Duru, Firat Borggrefe, Martin Ghadri, Jelena R.
Early diagnosis of amyotrophic lateral sclerosis by threshold tracking and conventional transcranial magnetic stimulation
Background and purpose: Short-interval intracortical inhibition by threshold tracking (T-SICI) has been proposed as a diagnostic tool for amyotrophic lateral sclerosis (ALS) but has not been compared directly with conventional amplitude measurements (A-SICI). This study compared A-SICI and T-SICI for sensitivity and clinical usefulness as biomarkers for ALS. Methods: In all, 104 consecutive patients referred with suspicion of ALS were prospectively included and were subsequently divided into 62 patients with motor neuron disease (MND) and 42 patient controls (ALS mimics) by clinical follow-up. T-SICI and A-SICI recorded in the first dorsal interosseus muscle (index test) were compared with recordings from 53 age-matched healthy controls. The reference standard was the Awaji criteria. Clinical scorings, conventional nerve conduction studies and electromyography were also performed on the patients. Results: Motor neuron disease patients had significantly reduced T-SICI and A-SICI compared with the healthy and patient control groups, which were similar. Sensitivity and specificity for discriminating MND patients from patient controls were high (areas under the receiver operating characteristic curves 0.762 and 0.810 for T-SICI and A-SICI respectively at 1-3.5 ms). Paradoxically, T-SICI was most reduced in MND patients with the fewest upper motor neuron (UMN) signs (Spearman ρ = 0.565, p = 4.3 × 10-6 ). Conclusions: Amplitude-based measure of cortical inhibition and T-SICI are both sensitive measures for the detection of cortical involvement in MND patients and may help early diagnosis of ALS, with T-SICI most abnormal before UMN signs have developed. The gradation in T-SICI from pathological facilitation in patients with minimal UMN signs to inhibition in those with the most UMN signs may be due to progressive degeneration of the subset of UMNs experiencing facilitation.
2025-10-28T12:30:03Z
Tankisi, Hatice Nielsen, Christina S.‐Z. Howells, James Cengiz, Bülent Samusyte, Gintaute Koltzenburg, Martin Blicher, Jakob U. Møller, Anette T. Pugdahl, Kirsten Fuglsang‐Frederiksen, Anders Carvalho, Mamede Bostock, Hugh
Inactivation of native K channels
We have experimented with isolated cardiomyocytes of mollusks Helix. During the whole-cell patch-clamp recordings of K+ currents a considerable decrease in amplitude was observed upon repeated voltage steps at 0.96 Hz. For these experiments, ventricular cells were depolarized to identical + 20 mV from a holding potential of - 50 mV. The observed spontaneous inhibition of outward currents persisted in the presence of 4-aminopyridine, tetraethylammonium chloride or E-4031, the selective class III antiarrhythmic agent that blocks HERG channels. Similar tendency was retained when components of currents sensitive to either 4-AP or TEA were mathematically subtracted. Waveforms of currents sensitive to 1 and 10 micromolar concentration of E-4031 were distinct comprising prevailingly those activated during up to 200 ms pulses. The outward current activated by a voltage ramp at 60 mV x s-1 rate revealed an inward rectification around + 20 mV. This feature closely resembles those of the mammalian cardiac delayed rectifier IKr.
2025-10-28T12:26:07Z
Kodirov, Sodikdjon Brachmann, Johannes Safonova, Tatiana A. Zhuravlev, Vladimir L.
Relação entre adaptabilidade e empregabilidade : um estudo exploratório com uma amostra do sector da construção civil
Na perspectiva segundo a qual os indivíduos vão construindo a sua carreira à medida que tomam as suas decisões e procuram corresponder às expectativas sociais, os trabalhadores necessitam de investir e desenvolver as suas competências de modo a se adaptarem e sobreviverem num mercado de trabalho exigente e sem fronteiras. Actualmente, os trabalhadores são, assim, cada vez mais confrontados com desafios que lhes exigem uma crescente preocupação com o desenvolvimento das suas carreiras, uma maior flexibilidade e diversificação da força de trabalho, e a capacidade para se adaptarem às alterações do mercado de trabalho. É neste sentido que surge a importância de conceitos, tais como Adaptabilidade e Empregabilidade, cuja relação constitui o objectivo do presente estudo. Foram aplicados o Inventário sobre Adaptabilidade e o Inventário sobre Empregabilidade a uma amostra de 64 trabalhadores de uma organização do sector da construção civil. Os resultados obtidos tendem a responder às questões de investigação inicialmente formuladas, tendo-se verificado uma forte relação entre os dois conceitos, e correlações significativas entre as diferentes dimensões da Adaptabilidade e da Empregabilidade. Apresentam-se, ainda, a discussão dos resultados, as limitações do presente estudo e futuras linhas de investigação, bem como algumas implicações para as práticas de gestão de recursos humanos.
Sex differences in functional connectivity between resting state brain networks in Autism Spectrum Disorder
Functional brain connectivity (FBC) has previously been examined in autism spectrum disorder (ASD) between-resting-state networks (RSNs) using a highly sensitive and reproducible hypothesis-free approach. However, results have been inconsistent and sex differences have only recently been taken into consideration using this approach. We estimated main effects of diagnosis and sex and a diagnosis by sex interaction on between-RSNs FBC in 83 ASD (40 females/43 males) and 85 typically developing controls (TC; 43 females/42 males). We found increased connectivity between the default mode (DM) and (a) the executive control networks in ASD (vs. TC); (b) the cerebellum networks in males (vs. females); and (c) female-specific altered connectivity involving visual, language and basal ganglia (BG) networks in ASD-in suggestive compatibility with ASD cognitive and neuroscientific theories.
2025-10-28T12:11:02Z
Tavares, Vânia Fernandes, Luís Afonso Antunes, Marilia Ferreira, Hugo Prata, Diana
Impacts of climate change on reservoir water availability, quality and irrigation needs in a water scarce Mediterranean region (southern Portugal)
Future climate for the Mediterranean climatic region is expected to bring an increase in temperatures, decrease in the precipitation quantity and shifts in the seasonal precipitation pattern. Although the impacts of climate change on water resources have been relatively well explored for the Mediterranean climatic region, the specific consequences for reservoirs and, in particular, water availability and irrigation issues have been less studied. The objective of this work is two-fold: (i) to assess the impacts of future climate changes on water resources availability, quality (focusing on phosphorus loads as this is the limiting nutrient for eutrophication) and irrigation needs for two multipurpose reservoirs in southern Portugal; (ii) to suggest climate change adaptation strategies, especially for the agricultural sector. To this end, the SWAT model was first calibrated against existing data on reservoir inflows as well as phosphorus loads. Then, SWAT was run with climate derived EURO-CORDEX models (RCA4/RACMO22E) for four periods (1970–2000, 2010–2040, 2040–2070 and 2070–2100). Water availability was analysed using the Water Exploitation Index (WEI) that was calculated for both reservoirs combining changes of inflows and irrigation requirements. The results indicated that climate change will negatively impact water availability in both reservoirs, especially under RCP8.5. In the case of the Monte Novo reservoir, future domestic water supply could be constrained by water quality problems related with phosphorus loads. For Vigia reservoir, the high water exploitation will lead to water scarcity problems, mainly as this reservoir on present-day conditions is restrictive on irrigation requirements. Adaptation strategies such as the implementation of high end technology (e.g. soil moisture and plant water stress probes, satellite imagery and drones to evaluate water stress – NDVI) as well as the renewal of the irrigation network and adequate crop selection can help attenuating the effects of climate change on the water resources in this region.
2025-10-28T12:17:19Z
Rocha, João Carvalho-Santos, Cláudia Diogo, Paulo Beça, Pedro Keizer, Jan Jacob Nunes, João Pedro
Rapid amphibian community recovery following removal of non-native fish from high mountain lakes
Amphibians of high mountain lakes face many threats related to global change, including novel pathogens, development, climate change and overexploitation. However, the foremost threat is the presence of non-native fish. One of the objectives of the LIFE+ LIMNOPIRINEUS project (2014–2019) was the recovery of protected amphibian communities (including the endemic Calotriton asper) in eight naturally fishless Pyrenean high mountain lakes, by controlling or eradicating non-native trout or minnows. During the summer months of 2015 to 2019, we removed 95–100% of the fish present in these lakes, and monitored changes in their amphibian populations, as well as surveyed 56 nearby control lakes with or without fish. We found rapid natural recovery of amphibian communities as fish removal work progressed. The fish-removal lakes achieved typical richness figures for the area one year after fish removal began, and typical species abundances after three years (with the only exception of Rana temporaria). We documented a total of 16 colonisation events, all by amphibian species from the same valley. The two earliest colonisation events were observed in the year in which fish removal began, with eight events the following year. The lack of colonisation from nearby valleys in the study period highlights the crucial role of nearby residual populations not affected by human impacts. We show that whole amphibian communities from high mountain lakes recover rapidly after eliminating or reducing non-native fish, proving that this is a powerful tool to improve the conservation status of endangered amphibians.
2025-10-28T12:28:33Z
Miró, Alexandre O'Brien, David Tomàs, Jan Buchaca, Teresa Sabás, Ibor Osorio, Víctor Lucati, Federica Pou-Rovira, Quim Ventura, Marc
Impacts of land-use and climate changes on surface runoff in a tropical forest watershed (Brazil)
Surface runoff generation capacity can be modified by land-use and climate changes. Annual runoff volumes have been evaluated in a small watershed of tropical forest (Brazil), using the Soil and Water Assessment Tool (SWAT) model. Firstly, the accuracy of SWAT in runoff predictions has been assessed by default input parameters and improved by automatic calibration, using 20-year observations. Then, the hydrological response under land uses (cropland, pasture and deforested soil) alternative to tropical forest and climate change scenarios has been simulated. SWAT application has showed that, if forest was replaced by crops or pasture, the watershed’s hydrological response would not significantly be affected. Conversely, a complete deforestation would slightly increase its runoff generation capacity. Under forecasted climate scenarios, the runoff generation capacity of the watershed will tend to decrease and will not be noticeably different among the representative concentration pathways. Pasture and bare soil will give the lowest and highest runoff coefficients, respectively.
2025-10-28T12:10:34Z
Lucas-Borja, Manuel Esteban Carrà, Bruno Gianmarco Nunes, João Pedro Bernard-Jannin, Léonard Zema, Demetrio Antonio Zimbone, Santo Marcello
Improvement of seasonal runoff and soil loss predictions by the MMF (Morgan-Morgan-Finney) model after wildfire and soil treatment in Mediterranean forest ecosystems
The negative hydrological effects of wildfire are very difficult to predict in Mediterranean forest ecosystems, due the intrinsic climate and soil characteristics of these areas. Among the hydrological models simulating surface runoff and soil erosion in these environmental contexts, the semi-empirical Morgan-Morgan-Finney (MMF) model can ensure the representation of the main physical processes, while offering ease of use and limiting the number of input parameters. However, literature reports very few modelling studies using MMF in burned areas of the Mediterranean environment with or without post-fire rehabilitation measures. To fill this gap, the capacity of the MMF model to predict the seasonal surface runoff and soil loss in a Mediterranean forest was verified and improved for unburned plots and areas affected by a wildfire, with and without post-fire straw mulch treatment. The application of MMF with default input parameters (set up according to the original guidelines of the model’s developers) led to poor performance. Conversely, after introducing some changes in input data for both the hydrological and erosive components (seasonal values of evapotranspiration, reduction of the soil hydrological depth, including soil water repellency effects in burned soils, and modelling erosive precipitation only), MMF was able to predict seasonal runoff volumes and soil loss with good reliability in all the experimented conditions. This modelling experiment has shown the capacity of the MMF model to simulate the seasonal hydrological and erosion response of the experimental unburned and burned soils of Mediterranean semi-arid forests. Although more research is needed to validate the model's prediction capacity in these conditions, the use of MMF as a management tool may be suggested to predict the hydrogeological risk in these delicate ecosystems threatened by wildfire, as well as to evaluate the potential efficiency of soil treatments after fire.
2025-10-28T12:09:22Z
Zema, Demetrio Antonio Nunes, João Pedro Lucas-Borja, Manuel Esteban
Exploring glucosinolates diversity in Brassicaceae: a genomic and chemical assessment for deciphering abiotic stress tolerance
Brassica is one of the most economically important genus of the Brassicaceae family, encompassing several key crops like Brassica napus (cabbage) and broccoli (Brassica oleraceae var. italica). This family is well known for their high content of characteristic secondary metabolites such as glucosinolates (GLS) compounds, recognize for their beneficial health properties and role in plants defense. In this work, we have looked through gene clusters involved in the biosynthesis of GLS, by combining genomic analysis with biochemical pathways and chemical diversity assessment. A total of 101 Brassicaceae genes involved in GLS biosynthesis were identified, using a multi-database approach. Through a UPGMA and PCA analysis on the 101 GLS genes recorded, revealed a separation between the genes mainly involved in GLS core structure synthesis and genes belonging to the CYP450s and MYBs gene families. After, a detailed phylogenetic analysis was conducted to better understand the disjunction of the aliphatic and indolic genes, by focusing on CYP79F1–F2 and CYP81F1–F4, respectively. Our results point to a recent diversification of the aliphatic CYP79F1 and F2 genes in Brassica crops, while for indolic genes an earliest diversification is observed for CYP81F1–F4 genes. Chemical diversity revealed that Brassica crops have distinct GLS chemo-profiles from other Brassicaceae genera; being highlighted the high contents of GLS found among the Diplotaxis species. Also, we have explored GLS-rich species as a new source of taxa with great agronomic potential, particularly in abiotic stress tolerance, namely Diplotaxis, the closest wild relatives of Brassica crops.
2025-10-28T12:21:27Z
Essoh, Anyse Pereira Monteiro, Filipa Pena, Ana Rita Pais, M. Salomé Moura, Mónica Romeiras, Maria M.
Alkaline air: changing perspectives on nitrogen and air pollution in an ammonia-rich world
Ammonia and ammonium have received less attention than other forms of air pollution, with limited progress in controlling emissions at UK, European and global scales. By contrast, these compounds have been of significant past interest to science and society, the recollection of which can inform future strategies. Sal ammoniac (nūshādir, nao sha) is found to have been extremely valuable in long-distance trade (ca AD 600–1150) from Egypt and China, where 6–8 kg N could purchase a human life, while air pollution associated with nūshādir collection was attributed to this nitrogen form. Ammonia was one of the keys to alchemy—seen as an early experimental mesocosm to understand the world—and later became of interest as ‘alkaline air’ within the eighteenth century development of pneumatic chemistry. The same economic, chemical and environmental properties are found to make ammonia and ammonium of huge relevance today. Successful control of acidifying SO2 and NOx emissions leaves atmospheric NH3 in excess in many areas, contributing to particulate matter (PM2.5) formation, while leading to a new significance of alkaline air, with adverse impacts on natural ecosystems. Investigations of epiphytic lichens and bog ecosystems show how the alkalinity effect of NH3 may explain its having three to five times the adverse effect of ammonium and nitrate, respectively. It is concluded that future air pollution policy should no longer neglect ammonia. Progress is likely to be mobilized by emphasizing the lost economic value of global N emissions ($200 billion yr−1), as part of developing the circular economy for sustainable nitrogen management. This article is part of a discussion meeting issue ‘Air quality, past present and future’.
2025-10-28T12:27:41Z
Sutton, Mark A. van Dijk, Netty Levy, Peter E. Jones, Matthew R. Leith, Ian D. Sheppard, Lucy J. Leeson, Sarah Sim Tang, Y. Stephens, Amy Braban, Christine F. Dragosits, Ulrike Howard, Clare M. Vieno, Massimo Fowler, David Corbett, Paul Naikoo, Mohd Irfan Munzi, Silvana Ellis, Christopher J. Chatterjee, Sudipto Steadman, Claudia E. Móring, Andrea Wolseley, Patricia A.
Debates: Does Information Theory Provide a New Paradigm for Earth Science? Emerging Concepts and Pathways of Information Physics
Entropy and Information are key concepts not only in Information Theory but also in Physics: historically in the fields of Thermodynamics, Statistical and Analytical Mechanics, and, more recently, in the field of Information Physics. In this paper we argue that Information Physics reconciles and generalizes statistical, geometric, and mechanistic views on information. We start by demonstrating how the use and interpretation of Entropy and Information coincide in Information Theory, Statistical Thermodynamics, and Analytical Mechanics, and how this can be taken advantage of when addressing Earth Science problems in general and hydrological problems in particular. In the second part we discuss how Information Physics provides ways to quantify Information and Entropy from fundamental physical principles. This extends their use to cases where the preconditions to calculate Entropy in the classical manner as an aggregate statistical measure are not met. Indeed, these preconditions are rarely met in the Earth Sciences due either to limited observations or the far-from-equilibrium nature of evolving systems. Information Physics therefore offers new opportunities for improving the treatment of Earth Science problems.
2025-10-28T12:24:46Z
Perdigão, Rui A. P. Ehret, Uwe Knuth, Kevin H. Wang, Jingfeng