34 documents found, page 1 of 4
Evaluation of heavy metal content in plastic bags used as improvised food cooki...
Costa, Manuel F. M.; Geraldo, Dulce; Carneiro, Joaquim A. O.; Nhanga, Manença Cristiano; Nhapulo, Sérgio Leonardo; João, Afonso FilipeThe widespread use of plastic bags as improvised food cooking covers in Mozambican communities has raised public health concerns, increasing interest in studying these plastic bags, which contain heavy metals additives used to improve their physical and chemical properties. This study aims to evaluate the levels of heavy metals commonly used in plastic bags used as improvised food cooking covers, focused on Moz...
A correlation-based approach for predicting humic substance bioactivity from di...
Silva, Ana Catarina; Bento, M. Fátima; Rocha, José Pedro Pereira Rebelo; Geraldo, Dulce; Proença, M. Fernanda R. P.; Antelo, Juan; Fiol, SarahThe efficient characterization of compost quality is essential for optimizing its application in agriculture and soil improvement. In this study, a correlation-based approach was employed to evaluate relationships between physicochemical properties, structural features, and reactivity indicators of compost extracts—fulvic acid-like (FA-L), humic acid-like (HA-L), and dissolved organic matter (DOM)—and their res...
Evaluation of heavy metal content in plastic bags used as part of food cooking ...
Nhanga, M. C.; Nhapulo, S.; Carneiro, Joaquim A. O.; Costa, Manuel F. M.; Geraldo, DulceIn Mozambique, rudimentary food preparation practices are still common. A common habit is the use of plastic bags for preparing foods such as tubers, meat and rice, particularly among families with relatively low financial resources. These bags are often used because they are cheap, easy to handle, flexible and offer good thermal insulation. Nevertheless, the practice of using plastic bags in cooking raises ser...
Developing a Compost Quality Index (CQI) based on the electrochemical quantific...
Silva, Ana Catarina; Rocha, Pedro; Geraldo, Dulce; Cunha, Ana; Antelo, Juan; Pinheiro, José P.; Fiol, Sarah; Bento, M. FátimaThe present work demonstrates the use of Cd<sup>2+</sup> as a reactivity probe of the fulvic acids (FAs), humic acids (HAs) and dissolved organic matter (DOM) compost extracts. Significant differences were observed between the extracts, with the HA extract showing the highest reactivity. Comparing the different composts, the largest reactivity variation was again observed for HA then FA and finally DOM extracts...
Antifungal activity of a new derivative of 5-aminoimidazole-4-carbohydrazonamide
Silva, B.; Costa, I.; Silva, R.; Remião, F.; Cerqueira, F.; Ribeiro, Ana Isabel Ferreira; Dantas, Daniela Filipa Costa; Rodrigues, Rui Pedro Vieira[Excerpt] Fungal infections, as recognized by the World Health Organization (WHO), are among the most worrying challenges for the medical community due to their high incidence, recurrence, and the emergence of resistance to the few available drugs and therapies. The discovery of new molecules with antifungal activity, exhibiting new mechanisms of action and less side effects, thus represents an important step f...
Enhancing the longevity and functionality of Ti-Ag dry electrodes for remote bi...
Carvalho, Daniel; Marques, Sandra Mariana Silva; Siqueira, Giorgia; Ferreira, Armando José Barros; Santos, João; Geraldo, DulceThis study aims to evaluate the lifespan of Ti-Ag dry electrodes prepared using flexible polytetrafluoroethylene (PTFE) substrates. Following previous studies, the electrodes were designed to be integrated into wearables for remote electromyography (EMG) monitoring and electrical stimulation (FES) therapy. Four types of Ti-Ag electrodes were prepared by DC magnetron sputtering, using a pure-Ti target doped with...
Evaluation of municipal waste compost in relation to the environmental retentio...
Bento, M. Fátima; Bettencourt, Ana Paula; Geraldo, Dulce; Ramísio, Paulo J.; Andrade, Otília Teresa Antunes RodriguesThis study investigates the performance of municipal compost as a heavy metals adsorbent 1 for environmental protection systems. The performed assays test the effects of pH (2-9) and contact time (5-250 minutes) on metal retention. To simulate leaching in natural systems, the soluble organic fraction was removed, leading to variations in the surface properties, including a 10% increase of cation exchange capaci...
Electrochemical characterization of imidazole-based carboxamidrazones in aqueou...
Rodrigues, Rui Pedro Vieira; Dantas, Daniela Filipa Costa; Carvalho, André Filipe Couto; Ribeiro, Ana Isabel Ferreira; Zille, Andrea; Silva, RenataThe search for new antibiotics is an emergent topic in the scientific community due to the appearance of pathogenic organisms multiresistant to the available drugs and therapy [1]. The worrying increase in infections caused by pathogenic fungi in immunosuppressed patients prompted the search for new antifungal agents with new mechanisms of action and less side effects [2]. The imidazole ring is a crucial scaffo...
Comparison of a variety of physico-chemical techniques in the chronological cha...
Silva, Ana Catarina; Rocha, P.; Antelo, J.; Valderrama, P.; Lopez, R.; Geraldo, Dulce; Proenca, M. F.; Pinheiro, J. P.; Fiol, S.; Bento, M. FátimaThe degree of stability and maturity of the organic matter are fundamental features of the chemical characterization of compost. These characteristics are related to the extensive formation of aromatic structures and of oxygen-containing functional groups. The increase of the amount of these chemical moieties can be assessed by different analytical methodologies, based on thermal, spectrophotometric, and electr...
Global Women’s Breakfast (GWB): #UnidaspelaQuímica
Aguiar-Ricardo, Ana; Alves, Arminda; Antunes, M. Cristina; Batalha, Filipa; Oliveira Brett, Ana Maria; Camões, Filomena; Cardoso, Ana L.Global Women’s Breakfast (GWB): #BoundbyChemistry. Global Women’s Breakfast is an initiative of the International Union of Pure and Applied Chemistry, aiming to give women scientists, from all over the world, the opportunity to know each other, communicating virtually and sharing their experiences. Many countries joined this initiative and Portugal was not an exception, with its participation already at the fir...