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Studies on the toxicity of an aqueous suspension of C60 nanoparticles using a b...
Santos, Sandra M. A.; Dinis, A. M.; Rodrigues, David M. F.; Peixoto, Francisco; Videira, Romeu A.; Jurado, A.S.The increasing use of C60 nanoparticles and the diversity of their applications in industry and medicine has led to their production in a large scale. C60 release into wastewaters and the possible accumulation in the environment has raised concerns about their ecotoxicological impact. In the present study, an aqueous suspension of C60 nanoparticles was prepared and its potential toxicity studied in laboratory, ...
Ethylazinphos Interaction with Membrane Lipid Organization Induces Increase of ...
Videira, Romeu A.; Antunes-Madeira, Maria C.; Madeira, Vítor M. C.Ethylazinphos increases the passive proton permeability of lipid bilayers reconstituted with dipalmitoylphosphatidylcholine (DPPC) and mitochondrial lipids. A sharp increase of proton permeability is detected at insecticide/lipid molar ratios identical to those inducing phase separation in the plane of DPPC bilayers, as revealed by differential scanning calorimetry (DSC). Ethylazinphos progressively depresses t...
Changes induced by malathion, methylparathion and parathion on membrane lipid p...
Videira, Romeu A.; Antunes-Madeira, Maria C.; Lopes, Virgínia I. C. F.; Madeira, Vítor M. C.Perturbations induced by malathion, methylparathion and parathion on the physicochemical properties of dipalmitoylphosphatidylcholine (DPPC) were studied by fluorescence anisotropy of DPH and DPH-PA and by differential scanning calorimetry (DSC). Methylparathion and parathion (50 [mu]M) increased the fluorescence anisotropy evaluated by DPH-PA and DPH, either in gel or in the fluid phase of DPPC bilayers, but m...
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