5 documents found, page 1 of 1
Understanding the ecological consequences of deep-sea mining: cadmium’s influen...
Rahman, Saif; Pizarro, Leonor; Magalhães, Catarina; Semedo, MiguelBackground: Metal-rich nodules in the deep ocean contain significant quantities of high-value metals such as copper, nickel, and cobalt [1]. Mining deep-sea minerals is considered as an alternative to land mining, to reduce environmental effects and gain geopolitical advantages [1,2]. However, this action may expose deep-sea microbes to toxic concentrations of metals such as cadmium (Cd) which are shown to have...
Cadmium effects on net N2O production by the deep-sea isolate Shewanella loihic...
Pizarro, Leonor; Magalhães, Catarina; Almeida, C. Marisa R.; Carvalho, Maria de Fátima; Semedo, MiguelDeep-sea mining may lead to the release of high concentrations of metals into the surrounding seabed, which can disturb important ecosystem functions provided by microbial communities. Among these, the production of N2O and its reduction to N2 is of great relevance since N2O is an important greenhouse gas. Metal impacts on net N2O production by deep-sea bacteria are, however, currently unexplored. Here, we eval...
Mapping human pathogens in wastewater using a metatranscriptomic approach
Carneiro, João; Pascoal, Francisco; Semedo, Miguel; Pratas, Diogo; Tomasino, Maria Paola; Rego, Adriana; Carvalho, Maria de Fátima; Mucha, Ana PaulaThe monitoring of cities' wastewaters for the detection of potentially pathogenic viruses and bacteria has been considered a priority during the COVID-19 pandemic to monitor public health in urban environments. The methodological approaches frequently used for this purpose include deoxyribonucleic acid (DNA)/Ribonucleic acid (RNA) isolation followed by quantitative polymerase chain reaction (qPCR) and reverse t...
Seasonal patterns of polycyclic aromatic hydrocarbons in digestive gland and ar...
Semedo, Miguel; Oliveira, Marta; Gomes, Filipa; Reis-Henriques, Maria Armanda; Delerue-Matos, Cristina; Morais, Simone; Ferreira, MartaAmong organic pollutants existing in coastal areas, polycyclic aromatic hydrocarbons (PAHs) are of great concern due to their ubiquity and carcinogenic potential. The aim of this study was to evaluate the seasonal patterns of PAHs in the digestive gland and arm of the common octopus (Octopus vulgaris) from the Northwest Atlantic Portuguese coast. In the different seasons, 18 PAHs were determined and the detoxif...
Metal accumulation and oxidative stress biomarkers in octopus (Octopus vulgaris...
Semedo, Miguel; Reis-Henriques, Maria Armanda; Rey-Salgueiro, Ledicia; Oliveira, Marta; Delerue-Matos, Cristina; Morais, Simone; Ferreira, MartaMetals are ubiquitous in the environment and accumulate in aquatic organisms and are known for their ability to enhance the production of reactive oxygen species (ROS). In aquatic species, oxidative stress mechanisms have been studied by measuring antioxidant enzyme activities and oxidative damages in tissues. The aim of this study was to apply and validate a set of oxidative stress biomarkers and correlate res...