Environmental Radioactivity
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. 40K, 226Ra AND 228Ra SERIES IN BOVINE AND POULTRY FEED AND IN DICALCIUM PHOSPHATE (DCP) SAMPLES BY GAMMA-RAY SPECTROMETRY
The aim of this study is to determine the amounts of radionuclides' activity present in samples of feed for young and adult chicken and feed for dairy and beef cattle, as well as in dicalcium phosphate (DCP) (CaHPO4), used as a nutritional supplement for animal feed. Radioactivity in these samples is due to the presence of the 238U and 232Th radioactive seri
Braz. arch. biol. technol.. Publicado em: 06/05/2016
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2. Avaliação radiométrica do U-238, Ra-226, Th-232 e K-40 em uma área anômala do agreste de Pernambuco
Estudos radiométricos e radioecológicos vêm sendo desenvolvidos mundialmente, em busca do mapeamento de áreas com elevados níveis de radioatividade, um pré-requisito essencial na investigação da exposição à radioatividade ambiental. Nesse trabalho foram estudadas amostras de rochas e solo derivado de uma área efetivamente anômala em urânio no m
Publicado em: 2009
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3. Radioatividade de rochas provenientes das formações geológicas pertencentes à bacia hidrográfica do Rio Tibagi
This work is a study of the 40K and the 238U and 232Th series radioactivity in rocks measured with high resolution gamma ray spectrometry. The rocks were taken from the geologic formations in the region of the Tibagi river hydrographic basin. The course of this river cuts through the Paleozoic and Mesozoic stratigraphic sequences of the Paraná sedimentary b
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/08/2008
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4. NATURAL RADIONUCLIDES AND 137Cs IN COMMERCIALIZED EDIBLE MUSHROOMS IN SÃO PAULO-BRAZIL / Radionuclídeos naturais e 137Cs em cogumelos comestíveis comercializados em São Paulo - Brasil
Artificial and natural radionuclides are commonly found in several compartments of the earths crust. Some mushroom species have a high capacity to absorb radionuclides and toxic elements from the soil. Diet is considered as one of the main routes of radioactive contamination. Therefore, radioactivity measurements in the environment and in food are extremely
Publicado em: 2008
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5. Marcos da história da radioatividade e tendências atuais
The first days of radioactivity, the discoveries of X-rays, radioactivity, of alpha- and beta- particles and gamma- radiation, of new radioactive elements, of artificial radioactivity, the neutron and positron and nuclear fission are reviewed as well as several adverse historical marks, such as the Manhattan project and some nuclear and radiological accident
Química Nova. Publicado em: 2007-02
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6. AvaliaÃÃo da exposiÃÃo externa à radiaÃÃo Gama dos trabalhadores de pedreiras de rochas granÃticas ornamentais de Pernambuco
Os âgranitosâ de Pernambuco estÃo entre as mais belas rochas ornamentais do Brasil e sÃo comercializados para vÃrios outros estados do Brasil e paÃses da Europa e da Ãsia. O estado apresenta uma vasta reserva de rochas ornamentais, entre elas os âgranitosâ, com um elevado potencial extrativo e um considerÃvel nÃmero de trabalhadores nessa atividad
Publicado em: 2007
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7. Natural radioactivity: occurrence and applications on environmental studies
Anais da Academia Brasileira de Ciências. Publicado em: 2002-09
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8. ENVIRONMENTAL RADIOACTIVITY
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9. Environmental Radioactivity
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10. Action of Diethylstilbestrol on Staphylococci: Further Observations on the Effect of Resting Cells
Diethylstilbestrol (DS) has been shown to be active against staphylococci and other gram-positive bacteria but not against gram-negative microorganisms. The present study extends these findings. Standardized suspensions of 14C-labeled Staphylococcus aureus serotypes III and IV and Shigella flexneri were prepared and exposed to pharmacological concentrations
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11. Models for Study of the Specificity by Which Indigenous Lactobacilli Adhere to Murine Gastric Epithelia
A Lactobacillus strain isolated from a mouse (indigenous) and another strain isolated from swine feces (nonindigenous) were compared in two model systems for their ability to adhere in vitro and in vivo to keratinizing squamous and columnar epithelia of mouse stomachs. In one model, stomachs dissected from specific-pathogen-free or germfree mice were injecte
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12. Radiolabeling of Treponema pallidum (Nichols virulent strain) in vitro with precursors for protein and RNA biosynthesis.
We observed uptake of [U-14C]serine, U-14C-labeled amino acid hydrolysates, and [2-14C]uracil by virulent Treponema pallidum in vitro for at least 96 h. No uptake of [2-14C]thymine, [1-14C]pyruvate, [U-14C]pyruvate, and [2-14C]uridine was detected. Treponemal protein and RNA biosynthetic activity was identified by erythromycin inhibition of amino acid and ur