Uvr
Mostrando 1-12 de 499 artigos, teses e dissertações.
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1. Sun exposure, skin lesions and vitamin D production: evaluation in a population of fishermen
Abstract: Background: Exposure to UVR provides benefits related to vitamin D synthesis, but also causes harms, since UVB is considered a complete carcinogen. There is no definition of the level of sun exposure and the proportion of exposed body required for proper synthesis of vitamin D in the skin without causing it damage. Objectives: This study aims to
An. Bras. Dermatol.. Publicado em: 29/07/2019
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2. Nucleotide excision repair pathway assessment in DNA exposed to low-intensity red and infrared lasers
Low-intensity lasers are used for prevention and management of oral mucositis induced by anticancer therapy, but the effectiveness of treatment depends on the genetic characteristics of affected cells. This study evaluated the survival and induction of filamentation of Escherichia coli cells deficient in the nucleotide excision repair pathway, and the action
Braz J Med Biol Res. Publicado em: 10/07/2015
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3. Low-level red laser therapy alters effects of ultraviolet C radiation on Escherichia coli cells
Low-level lasers are used at low power densities and doses according to clinical protocols supplied with laser devices or based on professional practice. Although use of these lasers is increasing in many countries, the molecular mechanisms involved in effects of low-level lasers, mainly on DNA, are controversial. In this study, we evaluated the effects of l
Braz J Med Biol Res. Publicado em: 10/07/2015
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4. Solar ultraviolet radiation: properties, characteristics and amounts observed in Brazil and South America
Abstract The beneficial and harmful effects of human exposure to solar ultraviolet radiation (UV-R) are topics that arouse great interest not only among physicians and scientists, but also the general public and the media. Currently, discussions on vitamin D synthesis (beneficial effect) are confronted with the high and growing number of new cases of non-mel
An. Bras. Dermatol.. Publicado em: 2015-06
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5. Induction of neoplastic cells in rat skin
PURPOSE: To investigate the induction of neoplastic lesions under the action of ultraviolet B radiation (UVR-B) and dimethyl benzanthracene (DMBA).METHODS:Forty Wistar rats were assigned to four groups (ten animals each), according to the procedure: group A received UVR-B irradiation, group B received topic DMBA, group C, UVR-B+DMBA and group D as control, o
Acta Cir. Bras.. Publicado em: 2014-02
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6. Cutaneous changes in rats induced by chronic skin exposure to ultraviolet radiation and organophosphate pesticide
PURPOSE: To study the possible potentiation of the carcinogenic effects of ultraviolet radiation associated with an organophosphate pesticide. METHODS: Forty Wistar rats were assigned into four groups (n=10 each) randomized according to the procedures: group A received only UVR-B radiation; group B, UVR-B for eight weeks followed by a seven week period
Acta Cir. Bras.. Publicado em: 2014-01
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7. An MLSA-based online scheme for the rapid identification of Stenotrophomonas isolates
An online scheme to assign Stenotrophomonas isolates to genomic groups was developed using the multilocus sequence analysis (MLSA), which is based on the DNA sequencing of selected fragments of the housekeeping genes ATP synthase alpha subunit (atpA), the recombination repair protein (recA), the RNA polymerase alpha subunit (rpoA) and the excision repair bet
Mem. Inst. Oswaldo Cruz. Publicado em: 2011-06
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8. Análise dos fatores determinantes para as concentrações de 25 hidroxivitamina D em diferentes populações da cidade de São Paulo: The São PAulo Vitamin D Evaluation Study (SPADES) / Analysis of determinant factors for 25 hydroxyvitamin D levels in different populations in the city of São Paulo: The São PAulo Vitamin D Evaluation Study (SPADES)
Contexto: A influência das estações do ano sobre as concentrações de vitamina D é fato amplamente reconhecido em países localizados em latitudes extremas. A cidade de São Paulo, Brasil (2334S), possui clima subtropical, com invernos amenos. Entretanto, desconhecemos o papel da sazonalidade sobre as concentrações de 25 hidroxivitamina D (25OHD) em n
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/08/2010
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9. Efeito de diferentes métodos de esterilização sobre nanofibras de plga produzidas por electrospinning / The effect of different sterilization methods on PLGA nanofibers produced by electrospinning
The effect of sterilization using ethanol, ultraviolet radiation (UVR) and antibiotic solution in PLGA scaffolds produced by electrospinning was evaluated. The properties of nanofibers and on the cellular adhesion were analysed. All methods generated sterile scaffolds but led to some kind of damage. Ethanol and antibiotics caused changes in morphology and di
Publicado em: 2010
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10. 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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11. Análise comparativa dos genes de reparo do DNA em Gluconacetobacter diazotrophicus e Gluconobacter oxydans
Gluconacetobacter diazotrophicus é uma alfa-proteobactéria Gram-negativa, tolerante a meios ácidos, fixadora de nitrogênio atmosférico e foi a primeira bactéria diazotrófica endofítica isolada da cana-de-açúcar. Por sua vez, Gluconobacter oxydans, também alfa-proteobactéria Gram-negativa, possui a capacidade de oxidar incompletamente alcoóis e c
Publicado em: 2009
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12. Estudo da radiação ultravioleta na Cidade de Natal-RN
There were studied the variation of the solar ultraviolet radiation (UVR) in four wavelengths (305 nm, 320 nm, 340 nm e 380 nm) and erythemic dose, measured in Natal RN Brazil, from January 2001 until December 2007, using the ground ultraviolet radiometer of the Instituto Nacional de Pesquisas Espaciais / Centro Regional do Nordeste INPE-CRN, fixed on the ro
Publicado em: 2008