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FCT2-Artigos (em revistas ou actas indexadas)

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http://hdl.handle.net/10400.1/198
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Percorrer FCT2-Artigos (em revistas ou actas indexadas) por Objetivos de Desenvolvimento Sustentável (ODS) "02:Erradicar a Fome"

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  • Antimicrobial and antioxidant activities of natural compounds: enhance the safety and quality of food
    Publication . Faleiro, Maria Leonor; Miguel, Maria da Graça
    Nature has offered us a tremendous diversity of natural compounds, for which antimicrobial and antioxidant properties have been intensively explored and nowadays are plenty recognized. During the last decades both the antimicrobial action of natural compounds (preventing and limiting microbial growth) and their antioxidant properties (reducing the oxidation of fats and limiting the ripening and browning of fruit and vegetables after harvesting) have been intensively investigated, particularly in the food packaging sector, evidencing that they may represent an effective eco-friendly approach to enhance the safety and quality of food products, without an environmentally deleterious impact.
    2020-08-20Editorial de revista Acesso aberto Ver mais
  • Competitiveness of portuguese montado ewe production systems among the european ewe production systems
    Publication . Ferreira da Silva da Costa Freitas, Maria de Belém; Ventura-Lucas, Maria Raquel; Izquierdo, Lola; Deblitz, Claus
    The number of ewes in Portugal registers a decrease since 1998. This decrease is felt particularly in the south of the country, which concentrates almost half of the existing ewes, mainly for meat production. One of the most important ewe production systems is the Montado, a High Nature Value ecosystem, occupying ca. 1.2 million ha in Portugal. The competitiveness of this system among the European ewe production systems is an important issue for the future of the Montado ecosystem. So, the objective of this paper is to analyze the ewe production systems in the Montado, using the agri benchmark database, and compare these systems with other European countries’ systems, ranking their competitiveness and e_ciency among other systems in the European Union. We concluded that this methodology facilitated an in-depth understanding not only of the competitiveness and e_ciency of ewe production systems in Portugal but also of their positioning regarding other systems in the European Union. The pattern of returns assures that these farms are competitive in the sense that they depend on the market on their decisions, and thus it is important that market values sheep products. Nevertheless, the diversification to other income sources would be a good option for the future sustainability of these farms and the opportunities and risks that these systems will deal with in a new green economy, with probable new functions and new opportunities for land, will be a challenge for the future.
    2020-05-22Artigo científico Acesso aberto Ver mais
  • Consortium of microalgae/nitrogen-fixing bacteria as a next-generation biofertilizer, biostimulant and biopesticide
    Publication . Gouveia, Luisa; Ferreira, Alice; Bastos, Carolina Vela; Avetisova, Gayane; Karapetyan, Zhaneta; Toplaghaltsyan, Anna; Melkonyan, Lusine
    This study aims to provide insights into a new consortium of a microalga, twelve nitrogen-fixing (N-fixing) bacteria and a cyanobacterium. The microalga Tetradesmus obliquus (T), in conjunction with various N-fixing bacteria and the cyanobacterium Synechocystis sp. PCC 6803 (S), the N-fixing bacterium Sphingobacterium sp. L13G8 (5), cultivated in complete Bristol medium and in Bristol-NaNO3 free conditions, were examined. The study encompassed the analysis of their consortia, including evaluation of their growth, and potential as a biostimulant, biofertilizer and biopesticide, and assessed for sedimentation performance for targeted applications. The T and N-fixing bacteria consortia had higher growth in Bristol NaNO3-free media. The triple culture TS5 had the highest growth parameter (2.4 OD540) in the same medium, followed by T5. The consortia were employed to ascertain the efficacy of their biostimulants and biofertilizers on watercress (Lepidium sativum) and to determine the potency of their biopesticides against the fungal pathogens Fusarium oxysporum and Rhizoctonia solani (in certain consortia). Consortium T5 demonstrated the most significant impact on the seeds germination index (212.7%) and root length (6.0 cm) of L. sativum. The same consortium had a significant impact on the shoot length (4.4 cm) of L. sativum. Among all consortia that were examined, T5 exhibited significant inhibitory effects on the growth of F. oxysporum (60.6%) and R. solani (69.2%). In the same consortium, the rate of microalgal biomass sedimentation was enhanced by the N-fixing bacterium (0.4 cm h−1). Consortium T5 was the most effective in relation to growth and biomass sedimentation efficiency, in addition to its use as a biostimulant, biofertilizer and biopesticide. The created combination of microalga and N-fixing bacterium represents significant progress in the field of microalga cultivation, with notable benefits including improved biomass sedimentation and enhanced agricultural practices, as well as environmental friendliness and safety.
    2025-07-17Artigo científico Acesso restrito Ver mais
  • The conversion of rockrose (Cistus ladanifer L.) shrubland into biodiverse pastures
    Publication . Vieira, João; Filip, Iván Daniel; Soares Curado de Matos, Isabel Cristina; Rodrigues, Alessandra; Trindade, Ana Rita; Silva, Luís; Cassinello, João; Carita, Teresa; Ferreira da Silva da Costa Freitas, Maria de Belém; Neves, Maria Alcinda
    Pastures in the Mediterranean region are vital for sustaining local agriculture and preserving biodiversity. When well-managed, these pastures enhance soil structure and fertility, reduce erosion, and improve water retention. These functions are especially critical in a climate marked by hot, dry summers and mild, wet winters. Moreover, these systems play a key role in carbon sequestration, contributing significantly to climate change mitigation. Mediterranean pastures also support the conservation of endemic plant species and provide essential habitats for a variety of wildlife. Quinta do Freixo (Algarve, Portugal) with an area around 800 hectares, is dedicated to sustainable agriculture and promotes ecological, economic and social sustainability. In addition to organic agriculture production, the farm also produces value-added food products and offers rural tourism experiences. On this farm, a dense shrubland of rockrose (Cistus ladanifer L.) is converted into pastures using a holistic method that includes mechanical cutting of the shrubs, spreading hay an regenerative rotational grazing (RRG) system. As a part of the project -C05-i03-I000237), these restored pastures are regularly monitored. Assessments included measurements of dry matter production and floristic composition. In addition, both the pastures and Cistus ladanifer shrublands were evaluated for the nutritional value and mineral composition of their foliage material. This approach has contributed to the development of species-rich pastures, rich in legumes and grasses and characterized by high protein content, excellent digestibility, and a well-balanced mineral composition. Although Cistus ladanifer had a relatively lower nutritional value due to its lower protein content and digestibility, the analysis showed that its aerial parts can serve as a supplementary feed resource, especially in periods of forage scarcity, contributing to overall feed availability in extensive grazing systems.The control of shrublands through this practice maintains biodiversity and reduces the risk of wildfires by effectively managing fuel loads.
    2025-12-24Artigo científico Acesso aberto Ver mais
  • Deep tutti-frutti II: explainability of CNN architectures for fruit dry matter predictions
    Publication . Passos, Dário
    One of the criticisms that deep chemometric models usually face is their lack of explainability. In this work, three different explainability methods (Regression Coefficients, LIME and SHAP) are applied to different convolutional neural network (CNN) architectures, previously optimized for the task of multifruit dry matter content prediction based on NIR spectra. Additionally, a convolutional filter characterization is also performed to help clarify the type of modelling performed by the convolutional layers. The analysis allowed to extract information about the wavelength bands relevant to the models’ performance (feature importance) and to understand how different convolutional layer topologies transform the spectra leading to three types of modelling: data driven preprocessing, dimensionality reduction and hierarchical feature extraction. Feature importance analysis indicates that the relevant spectral bands used by the different CNN architectures for prediction of dry matter is basically the same. They are the same as the bands relevant to PLS and these bands can be attributed to specific known vibrational groups. Moreover, in the context of the multifruit prediction task, the analysis also points out that CNNs tend to identify and use spectral features that are informative across different fruit spectra, much like domain-invariant features identified by di-CovSel variable selection.
    2025-09Artigo científico Acesso aberto Ver mais
  • Diversity of bioactive compounds in microalgae: key classes and functional applications
    Publication . Osathanunkul, Maslin; Thanaporn, Suebsuya; Karapetsi, Lefkothea; Nteve, Georgia Maria; Pratsinakis, Emmanouil; Stefanidou, Eleni; Lagiotis, Giorgos; Avramidou, Eleni; Zorxzobokou, Lydia; Tsintzou, Georgia; Athanasiou, Artemis; Mpelai, Sofia; Constandinidis, Constantinos; Pantiora, Panagiota; Merino, Marián; Mullor, José Luis; Dobrovic, Luka; Cerasino, Leonardo; Ogawa, Tomohisa; Tsaousi, Meropi; Rodrigues, Alexandre M. C.; Cardoso, Helena; Pires, Rita; Rodrigues Figueiredo, Daniel; Figueiredo, Daniel; Costa, Inês F.; Anjos, Catarina; Labrou, Nikolaos E.; Madesis, Panagiotis
    Microalgae offer a sustainable and versatile source of bioactive compounds. Their rapid growth, efficient CO2 utilization, and adaptability make them a promising alternative to traditional production methods. Key compounds, such as proteins, polyunsaturated fatty acids (PUFAs), polyphenols, phytosterols, pigments, and mycosporine-like amino acids (MAAs), hold significant commercial value and are widely utilized in food, nutraceuticals, cosmetics, and pharmaceuticals, driving innovation across multiple industries. Their antiviral and enzyme-producing capabilities further enhance industrial and medical applications. Additionally, microalgae-based biostimulants and plant elicitor peptides (PEPs) contribute to sustainable agriculture by enhancing plant growth and resilience to environmental stressors. The GRAS status of several species facilitates market integration, but challenges in scaling and cost reduction remain. Advances in biotechnology and metabolic engineering will optimize production, driving growth in the global microalgae industry. With increasing consumer demand for natural, eco-friendly products, microalgae will play a vital role in health, food security, and environmental sustainability.
    2025-05-22Artigo científico Acesso aberto Ver mais
  • Ecological and syntaxonomic analysis of the communities of glebionis coronaria and G. discolor (Malvion neglectae) in the European Mediterranean area
    Publication . Cano, Eusebio; Cano-Ortiz, Ana; Quinto Canas, Ricardo; Piñar Fuentes, Jose Carlos; Meireles, Catarina Rodrigues; Raposo, Mauro; Gomes, Carlos Pinto; Laface, Valentina Lucia Astrid; Spampinato, Giovanni; Musarella, Carmelo Maria
    Nitrophilous communities dominated by Glebionis coronaria and Glebionis discolor in the European Mediterranean area were studied. The nomenclature was corrected according to the current taxonomy, following the International Code of Phytosociological Nomenclature (ICPN). The statistical analysis revealed six new associations and one subassociation, with four in Spain, one in Greece, and one in Italy. Additionally, a subassociation of high relevance due to its endemic character was identified. These grasslands exhibit requirements for organic matter and other edaphic nutrients that are closer to those of Malva neglecta communities than to those of Hordeum murinum subsp. leporinum. We confirmed the published syntaxon with the rank of Resedo albae-Glebionenion coronariae suballiance and its subordination to the Malvion neglectae alliance, and we established the type association for this suballiance. Sisimbrietalia officinalis J. Tüxen in Lohmeyer et al. 1962 em. Rivas-Martínez, Báscones, T. E. Díaz, Fernández-González & Loidi 1991. Stellarietea mediae Tüxen, Lohmeyer & Preising ex von Rochow 1951.
    2024-02-20Artigo científico Acesso aberto Ver mais
  • Edible coatings enhance storability and preserve quality of kiwiberry (Actinidia arguta L.) cv. Ken’s Red
    Publication . Guerreiro, Adriana; Gago, Custódia; Passos, Dário; Martins, Jaime; Cruz, Sandra P.; Guerra, Rui; Veloso, Fernão; Antunes, Maria Dulce
    Kiwiberries, an emerging fruit variety with increasing consumer demand, face significant commercialization challenges due to their short shelf life. This study evaluates the effectiveness of edible alginate-based coatings in extending the shelf life of kiwiberries. Two emulsion types—coarse (Coarse) and nanoemulsions (Nano)—and two application methods—spraying (Spray) and dipping (Dip)—were tested. Additionally, the use of visible/near-infrared (Vis-NIR) spectroscopy for non-destructive quality monitoring was explored. Coatings were prepared with 2% (w/v) alginate (SAlg) enriched with eugenol (Eg) and citral (Ct) at their minimum inhibitory concentrations (MICs) of 0.10% and 0.15%, respectively, as well as at double these concentrations. This resulted in a total of ten different treatments. The fruits were stored at approximately 5 ◦C, with evaluations conducted after 5 days, 2 weeks, and 4 weeks. Quality parameters, including color, firmness, soluble solid content (SSC), dry matter, weight loss, decay, total phenolic content (TPC), flavonoids, DPPH, FRAP, and malondialdehyde (MDA) levels, were analyzed. Over the storage period, color and SSC increased, while firmness decreased. Weight loss and MDA levels showed the most significant changes, particularly in treatments with higher essential oil concentrations. Notably, treatments such as SAlg Spray, SAlg Dip, SAlg Ct 0.15 + Eg 0.1 Nano Spray, SAlg Ct 0.15 + Eg 0.1 Nano Dip, and SAlg Ct 0.15 + Eg 0.1 Coarse Dip demonstrated superior preservation of kiwiberry quality. Moreover, Vis-NIR spectroscopy proved valuable for distinguishing between coating treatments, highlighting its potential for non-destructive quality assessment.
    2025-01-19Artigo científico Acesso aberto Ver mais
  • Efficacy of slow sand filtration enriched with trichoderma atroviride in the control of fusarium oxysporum in soilless cultivation systems
    Publication . Matias, Pedro; Guerreiro David Coelho, Luísa Isabel; Reis, Mário
    On a planet intending to move toward carbon neutrality while ensuring food security, maximizing water and nutrient use efficiency in agriculture is essential. Soilless cultivation offers a promising solution for food production, yet in substrate-based systems, excess nutrient solution (drainage) is often discarded to maintain phytosanitary safety, resulting in considerable water and nutrient waste. Reusing this drainage requires disinfection to eliminate pathogens. Among available methods, slow sand filtration (SSF) is ecological, economical, and simple, showing strong biological control potential, though not always fully effective against Fusarium oxysporum. Trichoderma atroviride, an antagonistic fungus, may enhance SSF performance. Its antagonistic capacity was evaluated in vitro via direct confrontation assays and in vivo using a closed-loop soilless cucumber cultivation system with eight treatment combinations of SSF, T. atroviride, and F. oxysporum. SSF reduced F. oxysporum incidence by approximately 48%, T. atroviride in irrigation by 44%, and SSF enriched with T. atroviride reached 58% disease incidence reduction, though this increase was not statistically significant. These results confirm that both SSF and T. atroviride can partially suppress F. oxysporum, but further optimization is needed for consistent and complete pathogen control.
    2026-01-14Artigo científico Acesso aberto Ver mais
  • Embedding a real-time strawberry detection model into a pesticide-spraying mobile robot for greenhouse operation
    Publication . Amraoui, Khalid El; Ansari, Mohamed El; Lghoul, Mouataz; Alaoui, Mustapha El; Abanay, Abdelkrim; Jabri, Bouazza; Masmoudi, Lhoussaine; LUÍS VALENTE DE OLIVEIRA, JOSÉ
    Abstract: The real-time detection of fruits and plants is a crucial aspect of digital agriculture, enhancing farming efficiency and productivity. This study addresses the challenge of embedding a real-time strawberry detection system in a small mobile robot operating within a greenhouse environment. The embedded system is based on the YOLO architecture running in a single GPU card, with the Open Neural Network Exchange (ONNX) representation being employed to accelerate the detection process. The experiments conducted in this study demonstrate that the proposed model achieves a mean average precision (mAP) of over 97%, processing eight frames per second for 512 × 512 pixel images. These results affirm the utility of the proposed approach in detecting strawberry plants in order to optimize the spraying process and avoid inflicting any harm on the plants. The goal of this research is to highlight the potential of integrating advanced detection algorithms into small-scale robotics, providing a viable solution for enhancing precision agriculture practices.
    2024-08-15Artigo científico Acesso aberto Ver mais