Luiz Querino de Araújo Caldas

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For certain metal arc-welding and other metal processing operations, compounds of barium are used as flux components. Airborne fumes generated by welding with electrodes using barium fluoride or carbonate fluxes may contain 15-30% of barium in readily water-soluble form (Dare et al. 1984). Urine of welders inhaling such fumes was shown to contain elevated(More)
The radiobiocomplexes labeled with technetium-99m (Tc-99m) have been widely used in nuclear medicine in single photon emission computed tomography and in basic research. The aim of this study was to assess the influence of a Nectandra membranacea extract on the bioavailability of the sodium pertechnetate (Na(99m)TcO(4)) radiobiocomplex in rat organs. The(More)
Arctium lappa (burdock) has been used to treat inflammatory processes. Blood constituents labeled with technetium-99m (Tc) have been utilized in nuclear medicine. It was evaluated the influence of a burdock extract on the labeling of blood constituents with Tc and on the morphometry of red blood cells. Blood samples from Wistar rats were incubated with(More)
The present paper attempts to set bounds for a qualitative and quantitative evaluation of immune-responses towards cellular mechanisms, as a tool for toxicological studies. It makes a plain distinction between the assessment of skin irritation and skin sensitization evoked by chemical haptens. Three well-known predictive methods to test delayed cutaneous(More)
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