Browsing by Author "Ferreira, Carla"
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- Assessment of promising agricultural management practicesPublication . Barão, Lúcia; Alaoui, Abdallah; Ferreira, Carla; Basch, Gottlieb; Schwilch, Gudrun; Geissen, Violette; Sukkel, Wijnand; Lemesle, Julie; Garcia-Orenes, Fuensanta; Morugán-Coronado, Alicia; Mataix-Solera, Jorge; Kosmas, Costas; Glavan, Matjaž; Pintar, Marina; Tóth, Brigitta; Hermann, Tamás; Vizitiu, Olga Petruta; Lipiec, Jerzy; Reintam, Endla; Xu, Minggang; Di, Jiaying; Fan, Hongzhu; Wang, FeiiSQAPER project - Interactive Soil Quality Assessment in Europe and China for Agricultural Productivity and Environmental Resilience - aims to develop an app to advise farmers on selecting the best Agriculture Management Practice (AMPs) to improve soil quality. For this purpose, a soil quality index has to be developed to account for the changes in soil quality as impacted by the implementation of the AMPs. Some promising AMPs have been suggested over the time to prevent soil degradation. These practices have been randomly adopted by farmers but which practices are most used by farmers and where they are mostly adopted remains unclear. This study is part of the iSQAPER project with the specific aims: 1) map the current distribution of previously selected 18 promising AMPs in several pedo-climatic regions and farming systems located in ten and four study site areas (SSA) along Europe and China, respectively; and 2) identify the soil threats occurring in those areas. In each SSA, farmers using promising AMP's were identified and questionnaires were used to assess farmer's perception on soil threats significance in the area. 138 plots/farms using 18 promising AMPs, were identified in Europe (112) and China (26).Results show that promising AMPs used in Europe are Crop rotation (15%), Manuring & Composting (15%) and Min-till (14%), whereas in China are Manuring & Composting (18%), Residue maintenance (18%) and Integrated pest and disease management (12%). In Europe, soil erosion is the main threat in agricultural Mediterranean areas while soil-borne pests and diseases is more frequent in the SSAs from France and The Netherlands. In China, soil erosion, SOM decline, compaction and poor soil structure are among the most significant. This work provides important information for policy makers and the development of strategies to support and promote agricultural management practices with benefits for soil quality.
- Facebook, física e social network analysisPublication . Pedro, N.; Ferreira, CarlaNuma incursão teórica à análise de redes sociais enquanto área científica derivada de múltiplas domínios disciplinares e com aplicação em tantos mais, e focando em particular atenção sobre a rede social Facebook, como caso particular de análise para maior compreensão do fenómeno actual das online social networks, o presente trabalho procura contribuir para a reflexão sobre as potencialidades educativas destes ambientes virtuais de socialização. Descreve-se um projecto exploratório realizado com alunos do 7º ano na disciplina de Ciências Físico-químicas. Os dados analisados decorrem da aplicação de questionários e da utilização de procedimentos de análise de redes sociais. Os resultados encontrados denunciam percepções favoráveis dos alunos relativamente ao projecto, coesão no interior do grupo constituído e cumprimento integral das actividades de aprendizagem propostas.
- hiPSC-based model of prenatal exposure to cannabinoids: effect on neuronal differentiationPublication . Miranda, Cláudia C.; Barata, Tiago; Vaz, Sandra H.; Ferreira, Carla; Quintas, Alexandre; Bekman, EvgueniaPhytocannabinoids are psychotropic substances ofcannabis with the ability to bind endocannabinoid (eCB) receptors that regulate synaptic activity in the central nervous system (CNS). Synthetic cannabinoids (SCs) are synthetic analogs of Δ9-tetrahydrocannabinol (Δ9-THC), the psychotropic compound of cannabis, acting as agonists of eCB receptor CB1. SC is an easily available and popular alternative to cannabis, and their molecular structure is always changing, increasing the hazard for the general population. The popularity of cannabis and its derivatives may lead, and often does, to a child's exposure to cannabis both in utero and through breastfeeding by a drug-consuming mother. Prenatal exposure to cannabis has been associated with an altered rate of mental development and significant changes in nervous system functioning. However, the understanding of mechanisms of its action on developing the human CNS is still lacking. We investigated the effect of continuous exposure to cannabinoids on developing human neurons, mimicking the prenatal exposure by drug-consuming mother. Two human induced pluripotent stem cells (hiPSC) lines were induced to differentiate into neuronal cells and exposed for 37 days to cannabidiol (CBD), Δ9-THC, and two SCs, THJ-018 and EG-018. Both Δ9-THC and SC, at 10 μM, promote precocious neuronal and glial differentiation, while CBD at the same concentration is neurotoxic. Neurons exposed to Δ9-THC and SC show abnormal functioning of voltage-gated calcium channels when stimulated by extracellular potassium. In sum, all studied substances have a profound impact on the developing neurons, highlighting the importance of thorough research on the impact of prenatal exposure to natural and SC.
- Promising Agricultural Management Practices and Soil Threats in Europe and ChinaPublication . Barão, Lúcia; Alaoui, Abdallah; Ferreira, Carla; Basch, Gottlieb; Schwilch, Gudrun; Geissen, V; Sukkel, Wijnand; Lemesle, Julie; Garcia-Orenes, Fuensanta; Morugán-Coronado, Alicia; Mataix-Solera, Jorge; Kosmas, Costas; Glavan, Matjaž; Pintar, Marina; Szabó, Brigitta; Hermann, Tamás; Vizitiu, Olga P.; Lipiec, Jerzy; Reintam, Endla; Xu, Minggang; Di, Jiaying; Fan, Hongzhu; Wang, FeiAdvising farmers on the best agricultural management practices (AMP) to be adopted in order to sustain agricultural productivity while improving soil quality is mandatory to assure future food production. Some promising AMPs have been suggested over the time to prevent soil degradation. These practices have been randomly adopted by farmers but which ones are mostly used by farmers and where they have been applied remains unclear. As part of the iSQAPER project—Interactive Soil Quality Assessment in Europe and China for Agricultural Productivity and Environmental Resilience—we (1) mapped the current distribution of previously selected 18 promising AMPs in several pedoclimatic regions and farming systems along Europe and China, based on ten and four study site areas (SSA), respectively; and (2) identified the soil threats occurring in those areas. In each SSA, farmers using promising AMPs were identified and questionnaires were used to assess farmer’s perception on soil threats in their fields. For this study, 138 plots/farms were identified in Europe (112) and China (26). Results show that most widely used promising AMPs in Europe are crop rotation (15%), manuring and composting (15%), and min-till (14%), whereas in China are manuring and composting (18%), residue maintenance (18%), and integrated pest and disease management (12%). In Europe, soil erosion is the main threat in agricultural Mediterranean areas, while soil-borne pests and diseases are more frequent in the SSAs from France and the Netherlands. In China, soil erosion, SOM decline, compaction, and poor soil structure are among the main farmers’ concerns. This research provides relevant information for policy-makers and the development of strategies to support and promote agricultural management practices with benefits for soil quality.
- [Recensão] LOBITO, Nuno; COSTA, Ana Pessoa. Sons do silêncio. Cruz Quebrada: Oficina do Livro, 2008.Publication . Ferreira, CarlaRecensão crítica ao livro Sons do Silêncio, o qual partindo da objectiva de Nuno Lobito e dos registros de viagem confiados a Ana Pessoa e Costa, esta escreveu as memórias de itinerários de Nuno Lobito, profissional da fotografia. Este é um livro de vivências, onde se elabora, pela congregação de sentidos, uma síntese de experiências: a fotografia, a viagem, a descoberta, o sonho, a amizade, a realização pessoal.
- Registos da infância: uma apropriação pedagógica (Ana Paula Tavares e Luandino Vieira)Publication . Ferreira, CarlaRefletir sobre a obra de António Jacinto pressupõe igualmente pensar a sua herança e a da sua geração. Do ponto de vista de uma pedagogia da literatura, particularmente da angolana, revela-se produtivo o equilíbrio entre o estudo da História, da contextualização literária, e a significação possível dos textos literários à luz da atualidade em que os jovens se situam. O universo da infância e os seus registos literários, na multiplicidade de estilos, temáticas e genológica, constituem, em nossa opinião, um percurso de motivação para o estudo da literatura angolana, para uma apropriação da sua singularidade e do que ela pode simbolizar enquanto processo de enriquecimento pessoal e aprofundamento cultural. Nos textos selecionados de Ana Paula Tavares (“O milhafre”, “A menina dos ovos de ouro” e “Zé Miúdo”, in A Cabeça de Salomé) e de Luandino Vieira (A Guerra dos Fazedores de Chuva com os Caçadores de Nuvens, Guerra para Crianças), em torno dos quais iremos centrar a nossa comunicação, encontramos a infância e a sua leitura irrepetível de um universo que, sendo por força ficcional, nos leva também a lançar pontes de entendimento e compreensão do Outro.