Tracer Techniques
Mostrando 13-24 de 65 artigos, teses e dissertações.
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13. Desenvolvimento de traçadores ativáveis para aplicação em recuperação secundária de reservatórios de petróleo
Um campo interessante para aplicação de técnicas nucleares devido à complexidade dos problemas a serem estudados e importante devido ao forte impacto econômico e estratégico é a industria de petróleo. Pelas técnicas nucleares podem ser obtidas informações preciosas. A utilização de traçadores auxilia a caracterização de um reservatório de pe
Publicado em: 2005
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14. Estudo do comportamento dinâmico de flotação utilizando técnicas nucleares
Nesse trabalho foi realizado um estudo do comportamento dinâmico de uma coluna de flotação piloto através do uso da técnica de traçadores radioativos emissores gama. Também foi avaliada a aplicação da técnica em um condicionador e uma coluna de flotação em escala industrial. Como a flotação em coluna é um sistema trifásico (ar, água e partí
Publicado em: 2005
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15. Multidimensional modelling and calculation of combustion in porous media
In contrast with household heating systems based on open combustion flames, burners based on premixed combustion in inert porous media are characterized by higher thermal efficiency and high turndown ratio allied with compacity of the units. Moreover, porous burners, where a flame is anchored inside a porous matrix, are associated with low pollutants formati
Publicado em: 2005
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16. Estudo da atividade de drogas antifungicas atraves de curvas de crescimento de Candida albicans utilizando o sistema automatizado Bio-Cell Tracer
Candida species are opportunistic fungal pathogens that are often the causative agents of infections in immunocompromised patients. amphotericin B (AMPH), itraconazole (ITCZ), fluconazole (FLCZ) and 5-flucytosine (5-FC) are the principal drugs used on the treatment of candidemic patients. However, in some cases, the clinical responses of Candida are differen
Publicado em: 2003
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17. Evaluation of fecal sterols and geochemical markers hydrocarbons in sediments from Admiralty Bay, Antartica. / "Avaliação de introdução de esteróis fecais e hidrocarbonetos marcadores geoquímicos em sedimentos da Baía do Almirantado, Península Antártica"
Sewage and oil contribution are the main sources of pollution from the scientific stations to the antarctic marine environment. Sterols and hydrocarbons such as n-alkanes, polyciclic aromatics (PAHs) and linear alkylbenzenes (LABs) were investigated on surface sediments from Admiralty Bay, King George Island, Antarctica, collected during austral summer of 19
Publicado em: 2002
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18. Calculo da iluminação em sintese de imagens atraves de ray-tracing estocastico
This work studies the subject of illumination in realistic image generation with the goal of approaching the problem from the Physical laws envolved in the process, aimming to develop and implement techniques for calculating the illumination in computer generated images. The stochastic ray tracing method, also called distributed ray tracing, simulates the tr
Publicado em: 1993
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19. Radionuclide Tracer Techniques in Haematology
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20. Automated fluorescence polarization immunoassay for monitoring streptomycin.
The fluorescence polarization immunoassay technique has been used previously for the assay of vancomycin and the aminoglycoside antibiotics (gentamicin, tobramycin, and amikacin). We extended this technique to assay streptomycin. Fluorescein-labeled streptomycin was used as the tracer, and antiserum specific for streptomycin was raised in rabbits by conventi
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21. Kinetic Analysis of Plasma Insulin Disappearance in Nonketotic Diabetic Patients and in Normal Subjects: A TRACER STUDY WITH 125I-INSULIN
The studies so far reported on the metabolic clearance rate of insulin in human diabetes mellitus have given conflicting results, probably because they have been conducted on few patients and have used a variety of experimental techniques and data treatments. We investigated the kinetics of insulin distribution and degradation in 35 normal subjects and in 42
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22. Single-particle tracking: models of directed transport.
Single-particle tracking techniques make it possible to measure motion of individual particles on the cell surface. In these experiments, individual trajectories are observed, so the data analysis must take into account the randomness of individual random walks. Methods of data analysis are discussed for models combining diffusion and directed motion. In the
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23. BIOSYNTHESIS OF RIBOSE AND DEOXYRIBOSE IN PSEUDOMONAS SACCHAROPHILA1
Fossitt, Dexter D. (University of Michigan, Ann Arbor), and I. A. Bernstein. Biosynthesis of ribose and deoxyribose in Pseudomonas saccharophila. J. Bacteriol. 86:1326–1331. 1963.—The biosynthesis of ribose and deoxyribose in Pseudomonas saccharophila was studied by radioisotope-tracer techniques. Patterns of C14 in ribose isolated from the nucleic acids
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24. Diffusion measurement of fluorescence-labeled amphiphilic molecules with a standard fluorescence microscope.
The lateral diffusion of fluorescence-labeled amphiphilic tracer molecules dissolved within a two-dimensional matrix of lipids was measured by continuous illumination of an elongated rectangular region. The resulting spatial concentration profile of unbleached tracer molecules was observed with a standard epifluorescence microscope and analyzed with digital