Percorrer por autor "Costa, S."
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- Biomonitoring of wildfire emissions exposure among firefighters during active fire missionsPublication . Barros, B.; Paiva, A.M.; Azevedo, R.; Alves, Sara Elisa Brás;; Esteves, F.; Fernandes, Adília; Vaz, Josiana A.; Slezakova, K.; Pereira, M.C.; Costa, S.; Almeida, A.; Teixeira, J. P.; Oliveira, M.; Morais, S.The aim of this study was to conduct a multidisciplinary biomonitoring assessment of the exposure and health impacts of wildfire emissions on firefighters from the Northern Portugal, one of the regions most affected by wildfires. Firefighters from fourteen fire stations participated in pre- and post-exposure sampling campaigns during two consecutive years. Self-reporting biometric characteristics, lifestyle, clinical information, career years, environmental/occupational exposure along with urinary biomarkers of polycyclic aromatic hydrocarbons metabolites (OHPAHs), metal(loid)s [from the priority pollutant lists compiled by the Agency for Toxic Substances and Disease Registry 14, United States Environmental Protection Agency 11, and the Human Biomonitoring for Europe Initiative priority 4], lung injury, lipid peroxidation, DNA damage, blood pressure, cardiac frequency, and hemogram were evaluated (Barros et al., 2025; Esteves et al., 2025; Paiva et al., 2024a; Paiva et al., 2024b). Stronger correlations were found between OHPAHs and metal(loid) levels and effect biomarkers after wildfire combat in comparison to pre-exposure. Wildfire exposure increased urinary -smokers. For the latter, copper, cadmium and barium ions correlated with lung injury; antimony and cadmium correlated with lipid peroxidation; DNA oxidation correlated with antimony, cadmium, copper, lead, zinc, selenium, and rubidium levels. Moreover, arsenic, antimony, lead, and copper induced lipid peroxidation, and lead was linked with DNA oxidation among wildfire-exposed smokers. Significant positive correlations were found for age and/or career length with cadmium, lead, barium, strontium, and mercury, and for body mass index with arsenic. These results point to an increased risk of health effects both in non-smoking and smoking firefighters because of their occupation, highlighting the necessity to strengthen prevention strategies.
- Effect of tree size and variety on olive harvesting with an impact shakerPublication . Dias, António; Peça, José; Pinheiro, Anacleto; Costa, S.; Almeida, Arlindo; Santos, Luís S.S.; Reynolds, DomingosTests were carried out in Alentejo (Southern Portugal), with the objective of studying the influence of tree size and varieties in olive harvesting by vibration. A shaker manufactured in Portugal, mounted on a front loader of a four wheel drive tractor was used in the tests. The shaker requires a minimum of 30 kW and vibrates either the trunk, or the main branches. The results will be stated in terms of the percentage of olives harvested within the total yield, work rate and time of vibration per tree.