Ultraviolet Irradiation Uv
Mostrando 13-24 de 239 artigos, teses e dissertações.
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13. Lifespan extension and increased resistance to environmental stressors by N-Acetyl-L-Cysteine in Caenorhabditis elegans
OBJECTIVE: This study was performed to determine the effect of N-acetyl-L-cysteine, a modified sulfur-containing amino acid that acts as a strong cellular antioxidant, on the response to environmental stressors and on aging in C. elegans. METHOD: The survival of worms under oxidative stress conditions induced by paraquat was evaluated with and without in vi
Clinics. Publicado em: 2015-05
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14. Biochemical and color changes of fresh-cut melon (Cucumis melo L. cv. Galia) treated with UV-C
The importance of minimally processed commodities in the retail groceries of most developed countries has been rising continuously during the last decades. Cantaloupe melon is used more than any other fruit in fresh-cut processing. Ultraviolet (UV) light has been extensively used to simulate biological stres in plants and for determining resistance mechanism
Food Sci. Technol. Publicado em: 2014-09
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15. Aplicação da radiação ultravioleta como forma de contribuição para a química verde e construção de um reator fotoquímico alternativo e de baixo custo, para pré-tratamento de amostras
Ultraviolet radiation corresponds to a fraction of electromagnetic radiation, covering wavelengths between 1 and 400 nm. Methods based on UV irradiation have become popular because it is possible to treat samples simply by applying energy, avoiding procedures that require the use of toxic substances, thus contributing to the development of Green Chemistry. T
Quím. Nova. Publicado em: 2014-04
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16. UV and gamma irradiation effects on surface properties of polyurethane derivate from castor oil
Gamma and ultraviolet radiation effects on hardness, elastic modulus and viscoelastic properties of polyurethane derived from castor oil (PU) were investigated by nanoindentation tests. Modifications on surface morphology, induced by radiation, were observed by atomic force microscopy. The polyurethane derivate from castor oil shows good resistance to gamma
Polímeros. Publicado em: 21/05/2013
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17. BTEX: DESENVOLVIMENTO DE BARRAS DE EXTRAÇÃO SORTIVA, DETERMINAÇÃO EM EFLUENTE HOSPITALAR E DEGRADAÇÃO POR MEIO DE FOTOCATÁLISE HETEROGÊNEA COM TiO2 SUPORTADO EM POLÍMEROS / BTEX: DEVELOPMENT OF BARS SORPTIVE EXTRACTION, DETERMINATION IN HOSPITAL EFFLUENT AND DEGRADATION BY HETEROGENEOUS PHOTOCATALYSIS WITH TIO2 SUPPORTED IN POLYMERS.
In this work were developed low cost bars of sorptive extraction, using commercial adhesive based on polydimethylsiloxane (PDMS) for the preconcentration and determination of benzene, toluene, ethylbenzene and xylene (BTEX) in effluent from the University Hospital of Santa Maria (HUSM). It was applied multivariate fractional factorial design (26-2) to invest
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2012
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18. CARACTERIZAÇÃO MOLECULAR DOS COMPONENTES DO SISTEMA ANGIOTENSINA-(1-7) DURANTE A DIVERGÊNCIA FOLICULAR E EXPRESSÃO DE GENES DE REPARO DA FITA DUPLA DE DNA EM EMBRIÕES BOVINOS / MOLECULAR CHARACTERIZATION OF THE ANGIOTENSIN-(1-7) SYSTEM COMPONENTS DURING FOLLICULAR DEVIATION AND EXPRESSION OF DNA DOUBLE-STRANDED REPAIR GENES IN BOVINE EMBRYOS
The first study characterized the expression of MAS receptor and key enzymes for Ang-(1-7) production, such as, ACE2, NEP and PEP during follicular development. Furthermore, the regulation of local Ang1-7 system was evaluated after the intrafollicular injection of fulvestrant (an estradiolreceptor inhibitor) in the dominant follicle. Cows were ovariectomized
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2012
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19. Photochemoprotective effect of quercetin incorporated in microemulsion against skin damages induced by ultraviolet irradiation / Efeito fotoquimioprotetor de quercetina incorporada em microemulsão contra os danos na pele causados pela radiação ultravioleta
The ultraviolet radiation (UVR) exposition may lead to the skin oxidant/antioxidant imbalance injuring its integrity and leading to several disorders, such as ageing and skin cancer. Considering the close relationship between the increase in oxidative stress and UV-induced skin damages, together with the fact that epidemiological studies indicate that the us
Publicado em: 2009
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20. Evaluation of photodegradation in LDPE/modified starch blends
Photodegradation of LDPE/modified starch blends 80/20 m/m has been examined by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X ray diffraction (DRX) before and after exposure to ultraviolet radiation (UV). Samples were exposed to UV in the laboratory for periods of 6, 24, 48 and 60 hours. The main alteration in the po
Polímeros. Publicado em: 2009
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21. Gamma-induced modification on optical band gap of CR-39 SSNTD
Effect of gamma irradiation on optical absorption of nuclear track detectors like CR-39 was studied in different absorbed doses using ultraviolet-visible (UV-VIS) spectroscopy. The existence of the peaks, their shifting and broadening as a result of gamma irradiation has been discussed. The width of the tail of localized states in the band gap (Eu) was evalu
Brazilian Journal of Physics. Publicado em: 2008-12
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22. Estudo da fotooxidação de nanocomposito PP/bentonita / Study on the photo-degradation of PP/Bentonite nanocomposites
The cation exchange of the bentonite and its processing are important factors to the polimeric nanocomposite formulation. The objective of this work was to produce nanocomposites of polypropylene / sodium bentonite and polypropylene / organophilic bentonite through melt intercalation and analyze the degradation produced by ultraviolet irradiation. Cetyl trim
Publicado em: 2008
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23. SÃntese, caracterizaÃÃo e propriedades fotocrÃmicas da sais derivados do Ãcido N-(3,5-dinitrobenzoil)-α-fenilglicina
The preparation and characterization of salts derived from N-(3,5- dinitrobenzoyl)-α-phenylglycine was carried out by using protonated amines as counter-ion, as follows: NH4 + (DNBAm), (CH3-CH2-)2NH2 + (DNBD), (CH3-CH2-CH2- )NH3 + (DNBP), (CH3-CH2-CH2-CH2-)NH3 + (DNBBu) and (CH3-CH2-)3NH+ (DNBT). These salts showed photocromic effect with ultraviolet (U
Publicado em: 2008
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24. STUDY OF HMS-PP (HIGH MELT STRENGTH POLYPROPYLENE) BEHAVIOUR UNDER CONDITIONS OF ENVIRONMENTAL AND ACCELERATED DEGRADATION / Estudo do comportamento de HMS-PP (polipropileno com alta resistência do fundido) sob condições de degradação ambiental e acelerada
The behaviour study of polymeric materials concerning the weathering (heat, uv light, moisture, high-energy radiation, chemical attack and pollutants) is of fundamental importance to assess the stability of the material. The thermoplastics evaluated were the stabilized and not stabilized HMS-PP synthetized by gamma (g) irradiation under acetylene atmosphere.
Publicado em: 2008