Seasonal variation in accumulation of persistent organic pollutants in an Arctic marine benthic food web.

The aim of the present study was to investigate seasonal variation in persistent organic pollutant (POP) concentrations, as well as food-web biomagnification, in an Arctic, benthic marine community. Macrozoobenthos, demersal fish and common eiders were collected both inside and outside of Kongsfjorden, Svalbard, during May, July and October 2007. The samples were analysed for a selection of legacy chlorinated POPs. Overall, low levels of POPs were measured in all samples. Although POP levels and accumulation patterns showed some seasonal variation, the magnitude and direction of change was not consistent among species. Overall, seasonality in bioaccumulation in benthic biota was less pronounced than in the pelagic system in Kongsfjorden. In addition, the results indicate that δ(15)N is not a good predictor for POP-levels in benthic food chains. Other factors, such as feeding strategy (omnivory, necrophagy versus herbivory), degree of contact with the sediment, and a high dependence on particulate organic matter (POM), with low POP-levels and high δ(15)N-values (due to bacterial isotope enrichment), seem to govern the uptake of the different POPs and result in loads deviating from what would be expected consulting the trophic position alone.

Regimes ideais para exames específicos / Ideal regimes to specific examinations

Este trabalho visa a implantação de uma "tabela de regimes ideais para exames específicos" em radiodiagnóstico, para não só estabelecer um regime para cada tipo de exame, mas também fazer com que haja uma diminuição de filmes rejeitados e uma menor exposição do paciente.

This work has been an implantantion ·' regimes ideal of the table " for especify exams in radiografic, because establish each type of exam but too do which that decrease of films waste and a smaller pacient of exposição.

Diferença de densidade de um filme radiológico / Difference of density of a radiological film

Este trabalho foi realizado com o propósito de verificar a diferença de "densidade conforme Carlaton, Arlene cap.23" em três marcas de filmes diferentes, mostrando que além de fatores relacionados com o paciente, regime usado, processadoras, etc, também o filme em si é uma preocupação no sentido de termos uma boa qualidade de imagem.

This work has the purpose of find out the density difference in three marks of different films, displaying that over there of factors related with the pacient, used regime, processors, etc, too the film is a preocupacion in attention to have a good quality of the image

Controle de rejeitos radioativos em medicina nuclear / Control of radioative waste in medicine nuclear

Esta pesquisa é uma coletânea de dados sobre o controle de rejeitos no setor de Medicina Nuclear do Hospital São Lucas da PUCRS, visando melhores meios de armazenamento, uma redução dos mesmos e uma otimização do serviço.

This research is a collection of data about the control of waste in Medicine Nuclear of Hospital São Lucas of PUCRS. Purpose better means of storing, a decrease of sarnes anda optimizing the service