Nuclear Analytical Techniques
Mostrando 13-24 de 24 artigos, teses e dissertações.
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13. Studies of air pollution in the municipal district of Sete Lagoas, MG using nuclear techniques / Estudos da poluição do ar do município de Sete Lagoas, MG utilizando técnicas nucleares
Toxic metals, such as Ni, V, Zn, Cu, Cr, Mn and metalloids as As and Se and their compositions are associated mainly with the smaller diameter particulates present in the atmospheric aerosols. This fact is important, principally, when it concerns public health, because this is considered the breathable fraction of particles that can penetrate deeply into the
Publicado em: 2006
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14. Avaliação do comportamento termoanalítico e oxidativo do biodiesel de mamona / Evaluation of the thermoanalytic and oxidative behavior of the castor biodiesel
In this work biodiesel was gotten through the transesterification reaction using the oil of castor as source of triglycerides and using the methylic route for obtaining of esters. For the characterization of biodiesel and its mixtures with mineral diesel oil, physical chemical parameters and several analytical techniques had been used, as well as: gas chroma
Publicado em: 2006
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15. APPLICATION OF HR-MAS NMR AND CHEMOMETRIC ANALYSIS FOR DETECTION AND EVALUATION OF GENETICALLY MODIFIED SOYBEAN (Glycine max) CROPS / Emprego da RMN HR-MAS e análises quimiométricas no reconhecimento e avaliação de soja (Glycine max) geneticamente modificada
The Biotechnology has made possible the development of genetically modified (GM) organisms, including soybean, main Brazilian agricultural product. These GM specimens has been produced by changing some original characteristics of plant in order to increase productivity and to reduce production costs. However, these novel organisms should be evaluated, in ord
Publicado em: 2005
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16. Talinum patens: Análise por ativação neutrônica instrumental e prospecção fitoquímica
The use of plants for many diseases treatment is a millenary knowledge. These are the great importance for the formation of actual medicine bases. Actually, more than 25 % of the all drugs prescribed in the world are obtained from plants. The medicinal plants and other vegetable materials market reach to around two billions dollars. The researches of natural
Publicado em: 2005
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17. "Avaliação de diferentes marcadores para a determinação da digestibilidade e taxa de passagem do alimento em suínos" / Use of different markers for determining apparent digestibility and rate of passage in swine
The aim of this work was (1) to evaluate the use of chromic oxide, lanthanum and ytterbium as indigestible markers for the measurement of apparent digestibility in finishing pigs, (2) to determine the rate of passage of feed and (3) to compare two analytical techniques (ICP-OES and ED-XRF). In the digestibility assay, 12 finishing gilts was used. The treatme
Publicado em: 2002
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18. Técnicas analíticas nucleares aplicadas a medida em larga escala de aerossóis atmosféricos na região amazônica / Nuclear analytical techniques applied to large-scale measurement of atmospheric aerosols in the Amazon region
Neste trabalho o aerossol atmosférico, presente em diferentes localidades da região Amazônica, foi caracterizado. Foram estudadas as emissões biogênicas naturais da floresta, bem como as emissões de material particulado para a atmosfera, devido à ocorrência em larga escala de queimadas na Amazônia durante a estação seca. O aerossol atmosférico fo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/03/1996
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19. Calculos analiticos exatos em sistemas finitos
The ground state of spin-1/2 quantum finite systems is investigated in exact analytical way. The examples included correspond to cases in one, two and three dimensions, all of them described by the antiferromagnetic Heisenberg Hamiltonian. The manifold of total spin S, that contains the ground state, is determined throughout the energy ordering theorem of Li
Publicado em: 1994
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20. Produção microbiologica de carotenoides em escala industrial
In order to improve, transform and conserve food products, food processing methods frequently result in undersireable colour changes, thus necessitating the utilisation of food colouring additives. In the last few decades, scientists, in conjunction with industries have been investigating different ways of producing inocuous low cost colouring materials for
Publicado em: 1972
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21. Application of metabonomic analytical techniques in the modernization and toxicology research of traditional Chinese medicine
In the recent years, a wide range of metabonomic analytical techniques are widely used in the modern research of traditional Chinese medicine (TCM). At the same time, the international community has attached increasing importance to TCM toxicity problems. Thus, many studies have been implemented to investigate the toxicity mechanisms of TCM. Among these stud
Blackwell Publishing Ltd.
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22. Methylation pattern of mouse mitochondrial DNA.
The pattern of methylation of mouse mitochondrial DNA (mtDNA) was studied using several techniques. By employing a sensitive analytical procedure it was possible to show that this DNA contains the modified base 5-methylcytosine (m5Cyt). This residue occurred exclusively at the dinucleotide sequence CpG at a frequency of 3 to 5%. The pattern of methylation wa
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23. Nuclear Magnetic Resonance Studies of Poly(3-Hydroxybutyrate) and Polyphosphate Metabolism in Alcaligenes eutrophus
The metabolic pathways of poly(3-hydroxybutyrate) (PHB) and polyphosphate in the microorganism Alcaligenes eutrophus H16 were studied by 1H, 13C, and 31P nuclear magnetic resonance (NMR) spectroscopy and by conventional analytical techniques. A. eutrophus cells accumulated two storage polymers of PHB and polyphosphate in the presence of carbon and phosphate
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24. Solid-state 13C nuclear magnetic resonance spectroscopy of simultaneously metabolized acetate and phenol in a soil Pseudomonas sp.
We investigated concentration-dependent primary and secondary substrate relationships in the simultaneous metabolism of the ubiquitous pollutant phenol and the naturally occurring substrate acetate by a Pseudomonas sp. soil isolate capable of utilizing either substance as a sole source of carbon and energy. In addition to conventional analytical techniques,