Encontrados 18 documentos, a visualizar página 1 de 2
Monomethylmercury behaviour in sediments collected from a mercury-contaminated ...
Ramalhosa, Elsa; Río-Segade, Susana; Pereira, Eduarda; Vale, Carlos; Duarte, ArmandoSurface sediments and sediment cores were collected in a mercury (Hg)- contaminated lagoon, namely Largo do Laranjo – Ria de Aveiro, Portugal and analysed in order to establish the monomethylmercury (MeHg) behaviour in this kind of environment. In surface sediments, this compound was only detected in one place (13.2 ng g-1 (dry weight)). In this site, it was determined one of the lowest redox potentials (22 mV)...
Histological biomarkers in liver and gills of juvenile Solea senegalensis exposed
Costa, Pedro M.; Diniz, Mário S.; Caeiro, Sandra; Lobo, Jorge; Martins, Marta; Ferreira, Ana M.; Caetano, Miguel; Vale, Carlos; DelValls, ÁngelYoung juvenile Solea senegalensis were exposed to three sediments with distinct contamination profiles collected from a Portuguese estuary subjected to anthropogenic sources of contamination (the Sado estuary, western Portugal). Sedimentswere surveyed formetals (cadmium, chromium, copper, nickel, lead and zinc), ametalloid (arsenic) and organic contaminants (polycyclic aromatic hydrocarbons, polychlorinated bip...
Biochemical endpoints on juvenile Solea senegalensis exposed
Costa, Pedro M.; Caeiro, Sandra; Diniz, Mário S.; Lobo, Jorge; Martins, Marta; Ferreira, Ana M.; Caetano, Miguel; Vale, Carlos; DelValls, ÁngelJuvenile Solea senegalensis were exposed to fresh sediments from three stations of the Sado estuary (Portugal) in 28-day laboratory assays. Sediments revealed distinct levels of total organic matter, fine fraction, redox potential, trace elements (arsenic, cadmium, chromium, copper, nickel, lead and zinc) and organic contaminants (polycyclic aromatic hydrocarbons, polychlorinated biphenyls and a pesticide: dich...
Baço migratório em hérnia paraestomal
Carvalho,César Guerreiro de; Vale,Carlos Eduardo Pereira do; Castro Jr.,Paulo César de; Frade,Thiago BorgesThe authors report a case of a parastomal hernia that incarcerated a wandering spleen. We present a very rare case of an 85-year-old woman with a giant parastomal hernia. Computed tomography revealed a parastomal hernia with a wandering spleen inside. We introduce a different and simple alternative approach, with the smallest inconvenience as possible to solve the trouble. We carried out the treatment with a pr...
Experiência inicial no tratamento das hérnias paraestomais
Carvalho,César Guerreiro de; Vale,Carlos Eduardo Pereira do; Castro Jr.,Paulo César deO surgimento da hérnia paraestomal é uma conseqüência direta da confecção do estoma. Apesar de todos os esforços empregados na sua prevenção, a freqüência é bastante elevada e aumenta com o tempo. As alternativas de cura dessa afecção são todas cirúrgicas e várias técnicas foram propostas. Nesse artigo apresentamos uma breve revisão das alternativas operatórias que já foram apresentadas e apresentamos a técnica...
Assessment of spatial environmental quality status in Ria de Aveiro (Portugal)
Lopes, Cláudia Batista; Pereira, Maria Eduarda; Vale, Carlos; Lillebø, Ana Isabel; Pardal, Miguel Ângelo; Duarte, Armando CostaThe productivity of Ria de Aveiro is sustained by the large quantities of dissolved inorganic nutrients, mainly from freshwater inputs (e.g. agricultural drainage) and organic-rich anthropogenic point sources (e.g. urban sewage). The concentration of silicate and nitrate showed a similar seasonal variation and conservative behaviour, since 63 to 96% of the total variance of the concentration of silicate and 88 ...
Evaluation of ammonium and phosphate release from intertidal and subtidal sedim...
Serpa, Dalila; Falcão, Manuela; Duarte, Pedro; Cancela da Fonseca, Luís; Vale, CarlosDuring an annual cycle, overlying water and sediment cores were collected simultaneously at three sites (Tavira, Culatra and Ramalhete) of Ria Formosa’s intertidal muddy and subtidal sandy sediments to determine ammonium, nitrates plus nitrites and phosphate. Organic carbon, nitrogen and phosphorus were also determined in superficial sediments. Ammonium and phosphate dissolved in porewater were positively corre...
Mercury cycling between the water column and surface sediments in a contaminate...
Ramalhosa, Elsa; Río-Segade, Susana; Pereira, Eduarda; Vale, Carlos; Duarte, ArmandoMercury cycling in the water column and upper sediments of a contaminated area, the Largo do Laranjo, Aveiro (Portugal), was evaluated after determination of reactive and non-reactive mercury concentrations in the water column and pore waters of sediments, collected in several places of this bay. In the water column, reactive mercury concentrations varied between 10 and 37 pmol dm−3, the highest values being ob...
Accumulation versus remobilization of mercury in sediments of a contaminated la...
Ramalhosa, Elsa; Pato, P.; Monterroso, Paulo; Pereira, Eduarda; Vale, Carlos; Duarte, A.C.http://apps.isiknowledge.com/full_record.do?product=UA&search_mode=GeneralSearch&qid=12&SID=V12mKh9k9n8jHN@CK7o&page=1&doc=2&colname=WOS ; This work discusses the extent of sediment mercury retention in the most contaminated sites in the lagoon, and its exportation to the water column as well as transfer to biogenic suspended particles and to sea bass (Dicentrarchus labrax). Therefore,the main question, with i...
Distribution of mercury in the upper sediments from a polluted area (Ria de Ave...
Ramalhosa, Elsa; Pereira, Eduarda; Vale, Carlos; Válega, M.; Duarte, A.C.This work reports levels of Hg, Fe and Mn and sulphides in the upper sediments of the Laranjo Basin, and examines the influence of these elements on the distribution of mercury.
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