O presente estudo objetivou verificar o efeito da castração, da idade de abate e da interação castração x idade, assim como do peso corporal sobre os componentes corporais em ovinos Corriedale. Foram utilizados 57 animais ...

O experimento foi realizado no Centro de Pesquisa de Pecuária dos Campos Sulbrasileiros (Embrapa-Pecuária Sul) Bagé, RS, em sua fase de campo e no Departamento de Zootecnia da Universidade Federal de Pelotas, RS, em sua ...

Organotin compounds(OTs)were used in antifouling paints for more than four decades. However, due to their wide spread intensive use and high toxicity, undesirable effects in non-target marine organisms have been detected ...

The first appraisal of butyltins(BT)contami- nation linked with imposex incidence in the Pacific coast of South America was performed in the current study.Imposex occurrence was analyzed in three muricid species (Thaisbiserialis, ...

Biomarkers of exposure and effect of pollutants were analyzed in croakers Micropogonias furnieri (Teleostei: Sciaenidae) captured in winter and summer in a polluted and in a non-polluted site at the Patos Lagoon estuary ...

The aim of this work was to characterize the cholinesterases from gills of Crassostrea rhizophorae in order to use them as biomarkers. Gills were homogenized and then centrifuged (9000_g, 4 _C, 30 min). S9 and Triton X-100 ...

Chronic (14 days) and acute (48 h) copper effects on the antioxidant defense system and some physiological variables of Laeonereis acuta (Polychaeta, Nereididae) were evaluated. In both assays, two nominal copper concentrations ...

The protective effect of reactive sulfide against AgNO3 toxicity to Daphnia magna neonates was studied. Acute (48- h) toxicity tests were performed in the absence (,5 nM) and presence of low (;25 nM) and high (;250 nM) ...

Experiments were designed to assess the potential protective effect of the presence of sulfide against the acute (48-h) toxicity of silver(I) to Daphnia magna. Tests were conducted in borosilicate glass beakers (250 ml) ...

On the basis of these facts about freshwater fish and invertebrates: (i) the Na+ turnover is a physiological process associated with the gill membranes; (ii) the key mechanism of acute silver toxicity consists of reduction ...

Adult crayfish (Cambarus diogenes diogenes) exposed to 8.41 6 0.17 mg silver/L (19.4% as Ag1) in moderately hard freshwater under flow-through conditions for 96 h exhibited ionoregulatory disturbance, elevated metabolic ...

The flounder, Paralichthys orbignyanus, is found in coastal and estuarine waters of the Western South Atlantic Ocean. It is being considered for aquaculture due to its high market price and wide tolerance to environmental ...

Reactive oxygen species (ROS) are subproducts of the oxidative metabolism known to initiate chain reactions with polyunsaturated fatty acids that generate lipid peroxides (LPO). The objective of this work was to adapt the ...

Worms like polychaetes, oligochaetes, and nematodes, have been widely used in studies of aquatic and soil pollution. Several ecotoxicological characteristics make these animals suitable for use as a biomonitor, including ...

Glucocorticoid receptor concentration (GR) was determined in mononuclear (MNS) and polymorphonuclear (PMNS) cells isolated from 8 aged and 9 young male dogs. In addition, leukocyte responses to dexamethasone (0.1 mg kg21 ...

The objective of this work was to evaluate mechanisms of microcystin toxicity on crustacean species. Adult male crabs of Chasmagnathus granulatus (13.97"0.35 g) acclimated to low salinity (2‰) were injected with saline ...

Microcystins are toxins produced by cyanobacteria, being toxic to aquatic fauna. It was evaluated alternative mechanisms of microcystins toxicity, including oxidative stress and histopathology in the hepatopancreas of the ...

Daphnids (Daphnia magna) were exposed to AgNO3 at 0.303 6 0.017 mg silver/L (46.9% as Ag1), in the absence of food, in moderately hard synthetic water under static conditions for up to 48 h. Results from accumulation ...

Juvenile pink-shrimp Farfantepenaeus paulensis were exposed (75 days) to NH3 (0.016–0.287 mg L−1) under static condition with water renewal every 24 h. Experiments were performed at 20 °C, at a water salinity of 15 ppt, ...