Ultraviolet Irradiation Uv
Mostrando 25-36 de 239 artigos, teses e dissertações.
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25. INDUÇÃO PÓS-COLHEITA DA SÍNTESE DE RESVERATROL E DE RESISTÊNCIA DE FRUTOS A PODRIDÕES / POST-HARVEST INDUCTION OF RESVERATROL SYNTHESIS AND ROTTING CONTROL IN FRUITS
Os objetivos deste trabalho foram alcançados em duas etapas. Na primeira etapa, o objetivo foi avaliar a presença de trans-resveratrol em frutos de clima temperado e a sua variação de concentração nesses frutos durante o período de armazenamento, assim como a evolução dos polifenóis totais e antocianinas totais. Avaliou-se o conteúdo de polifenói
Publicado em: 2008
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26. Environmental factors influence evaluation on the structure, dynamics and optical properties of the aquatic humic substances form the "Rio Negro" - Amazonas / Avaliação da influência de fatores ambientais na estrutura, dinâmica e propriedades ópticas das substâncias húmicas aquáticas do Rio Negro
Nowadays, one of the major world concerning is focused in the increasing of the damaging ultraviolet (UV) radiation and its impact on the aquatic ecosystems. In addition, the Rio Negro, one of the principal tributaries of the Amazon Basin, is an appropriate site for studying the influence of the UV radiation in the dissolved organic matter (DOM) biogeochemis
Publicado em: 2007
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27. FotodegradaÃÃo e efeito combinado da radiaÃÃo gama/biodegradaÃÃo em blendas polietileno/amido
The polymeric blends composed by synthetic and natural polymers, as the starch, come deverving prominence in the development of new materials for presenting similar properties to synthetic polymers, and greater easiness of degrading when exposed to microorganisms in the environment, when they are discarded. The current work had for objective to evaluate of t
Publicado em: 2007
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28. Thermoluminescence, electron paramagnetic resonance and color centers properties of diopside / Propriedades de termoluminescência, de ressonância paramagnética eletrônica e de centros de cor de diopsídio
Diopside of chemical formula, CaMgSi2O6, a natural silicate mineral has been investigated concerning its Thermoluminescence (TL), Electron Paramagnetic Resonance (EPR) and Reflectance properties. Synthetic, pure or doped diopside, produced in the laboratory, has been investigated. Samples annealed at 600 `GRAUS´ C for one hour, to eliminate previously induc
Publicado em: 2007
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29. An extract of Polygonum multiflorum protects against free radical damage induced by ultraviolet B irradiation of the skin
Over the last decades, the incidence of ultraviolet B (UVB)-related skin problems has been increasing. Damages induced by UVB radiation are related to mutations that occur as a result of direct DNA damage and/or the production of reactive oxygen species. We investigated the anti-oxidant effects of a Polygonum multiflorum thumb extract against skin damage ind
Brazilian Journal of Medical and Biological Research. Publicado em: 2006-09
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30. PRESENÇA DE TRANS-RESVERATROL EM GELÉIAS DE UVA E SUA RELAÇÃO COM A RADIAÇÃO UV / DETERMINATION OF TRANS-RESVERATROL IN GRAPE JELLIES AND THE RELATIONSHIP WITH UV RADIATION
The presence of the composition trans-resveratrol (4,3 ,5 -trihidroxiestilbeno) was determined in grape jellies, with and without sugar, industrially produced in Brazil. Beyond this composition, also it has ben determined total phenols, total anthocyanins, total acidity, reducing sugars, soluble solids and color. Although in small concentrations, the presenc
Publicado em: 2006
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31. Development of clean analytical procedures in flow injection analysis for determination of environmentally relevant species / Desenvolvimento de procedimentos analíticos limpos em sistemas de análises em fluxo para determinação de espécies de interesse ambiental
Green chemistry has as principal objective the development and implementation of chemical processes and products to minimize or eliminate the use or generation of harmful substances to the human health and the environment. In this work, clean analytical procedures for determination of nitrate and nitrite in natural waters and for the treatment of wastes gene
Publicado em: 2005
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32. Evaluation of parameters associated with UV/EB cured clearcoats degradation used in outdoor environment / Avaliação da formação e degradação de filmes de vernizes curados por radiação ultravioleta e feixe de elétrons e expostos ao envelhecimento acelerado
The materials curable by ultraviolet (UV) or electron beam (EB) radiation such as inks, adhesives and coatings are reactive compounds made up of resin, monomer, photoinitiator and additives which undergo polymerization and crosslinking under irradiation producing thermoset products. This technology has been used in a great variety of industrial applications,
Publicado em: 2003
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33. Desenvolvimento e avaliaÃÃo de um escudo polimÃrico para minimizar a quebra de isoladores de vidro por vandalismo em linhas de transmissÃo
Electrical insulators are largely employed in the hot lines to isolate the electricity conductors from the earth and suppor them at the towers. Nowadays, there are several kinds of isolatores for such application. Particularly, the glass insulators are largely employed in Brazil, and it is known to have a long useful life, able to reach more than 40 years. F
Publicado em: 2003
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34. Avaliação da estabilidade de fibras de polipropileno em meios agressivos aos materiais a base de cimento
The use of polypropylene fibers in cement based materials has increased in the last years as a substitute for mineral and metallic fibers and as an alternative method to improve the mechanical properties of concrete. This work evaluated the stability of polypropylene fibers in aggressive environments to cement based materials by monitoring average molecular
Publicado em: 1995
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35. ULTRAVIOLET IRRADIATION OF NATIVE AND DENATURED TRANSFORMING DEOXYRIBONUCLEIC ACID FROM HAEMOPHILUS INFLUENZAE
Cabrera-Juarez, Emiliano (Johns Hopkins University School of Hygiene and Public Health, Baltimore, Md.) and Roger M. Herriott. Ultraviolet irradiation of native and denatured transforming deoxyribonucleic acid from Haemophilus influenzae. J. Bacteriol. 85:671–675. 1963.—Two antibiotic-resistance markers in denatured deoxyribonucleic acid (DNA) from Haemo
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36. Recovery of Division Ability in Ultraviolet-irradiated Escherichia coli Induced by Photoreactivation, Photoprotection, and Liquid Holding Treatment
Small doses of ultraviolet light (UV, 265 mμ) cause Escherichia coli B to grow into long, multinucleate, nonseptate, filamentous cells. This UV-induced filament formation can be prevented by irradiating with photoprotecting light (335 mμ) prior to UV irradiation, and by irradiating with photoreactivating light (406 mμ), or by liquid holding treatment, aft