Biological Radiation Effects
Mostrando 1-12 de 72 artigos, teses e dissertações.
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1. Sunscreen lotions in the dermatological prescription: review of concepts and controversies
Abstract The skin is regularly exposed to several environmental aggressions, including solar radiation, whose biological effects can induce sunburn, dyschromia, skin aging and cancer. Among the photoprotection measures, sunscreens comprise a relevant part of the strategy aimed to prevent solar radiation damage and, for effective action, the patient must adhe
Anais Brasileiros de Dermatologia. Publicado em: 2022
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2. Comparison of radiosensitivity response to acute and chronic gamma irradiation in colored wheat
Abstract We aimed to investigate the biological responses induced by acute and chronic gamma irradiation in colored wheat seeds rich in natural antioxidants. After acute and chronic irradiation, the phenotypic effects on plant growth, germination rate, seedling height, and root length were examined, and the biochemical changes were investigated by analyzing
Genet. Mol. Biol.. Publicado em: 28/06/2018
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3. Gamma radiation treatment activates glucomoringin synthesis in Moringa oleifera
Abstract Plants are a very rich source of pharmacologically relevant metabolites. However, the relative concentrations of these compounds are subject to the genetic make-up, the physiological state of the plant as well as environmental effects. Recently, metabolic perturbations through the use of abiotic stressors have proven to be a valuable strategy for in
Rev. bras. farmacogn.. Publicado em: 2017-10
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4. FTIR Spectroscopy Revealing the Effects of Laser and Ionizing Radiation on Biological Hard Tissues
This work evaluated the influence of ionizing and non-ionizing irradiations on the chemical structure of hard tissues using the mid-infrared spectroscopy. Enamel, dentin and bone slabs were submitted to gamma irradiation, as well as to Nd:YAG (λ = 1064 nm) and Er,Cr:YSGG (λ = 2078 nm) laser irradiations. The composition of slabs were evaluated by the Fouri
J. Braz. Chem. Soc.. Publicado em: 2015-12
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5. Low-intensity red and infrared laser effects at high fluences on Escherichia coli cultures
Semiconductor laser devices are readily available and practical radiation sources providing wavelength tenability and high monochromaticity. Low-intensity red and near-infrared lasers are considered safe for use in clinical applications. However, adverse effects can occur via free radical generation, and the biological effects of these lasers from unusually
Braz J Med Biol Res. Publicado em: 28/07/2015
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6. A dose-response curve for biodosimetry from a 6 MV electron linear accelerator
Biological dosimetry (biodosimetry) is based on the investigation of radiation-induced biological effects (biomarkers), mainly dicentric chromosomes, in order to correlate them with radiation dose. To interpret the dicentric score in terms of absorbed dose, a calibration curve is needed. Each curve should be constructed with respect to basic physical paramet
Braz J Med Biol Res. Publicado em: 26/05/2015
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7. Effects of UV-B radiation on Lecanicillium spp., biological control agents of the coffee leaf rust pathogen
Coffee leaf rust is the main disease of coffee and its causal agent is naturally hyperparasited by Lecanicillium lecanii, indicating its potential for biocontrol. Ultraviolet-B (UV-B) radiation is an important factor that interferes on application of biocontrol agents, and Lecanicillium can be affected by UV-B. The objective of this work was to evaluate the
Trop. plant pathol.. Publicado em: 2014-10
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8. Effect of ozone oxidative preconditioning in preventing early radiation-induced lung injury in rats
Ionizing radiation causes its biological effects mainly through oxidative damage induced by reactive oxygen species. Previous studies showed that ozone oxidative preconditioning attenuated pathophysiological events mediated by reactive oxygen species. As inhalation of ozone induces lung injury, the aim of this study was to examine whether ozone oxidative pre
Braz J Med Biol Res. Publicado em: 27/09/2013
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9. Mecanismos de indução de lesões no DNA pela luz UVA e seus efeitos biológicos. / Mechanisms of induction of DNA lesions by UVA light and its biological effects.
Irradiamos amostras de DNA com luz UVA em diferentes condições para estudar os possíveis mecanismos envolvidos na indução de lesões de DNA por essa radiação. As lesões de DNA formadas após as irradiações foram quantificadas com enzimas de reparo de DNA que reconhecem e clivam os sítios contendo bases oxidadas e dímeros de pirimidina (CPDs). Com
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/04/2012
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10. PROTETORES SOLARES À BASE DE FILTROS INORGÂNICOS: DESENVOLVIMENTO E CARACTERIZAÇÃO
The inorganic sunscreens represented mainly by titanium dioxide (TiO2) and Zinc Oxide (ZnO), were classified as inert particles, therefore, they are pointed out as the best way to protect the skin against the harmful effects of ultraviolet radiation (UV). However, recent studies suggest that these particles have several stability problems that may lead to a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/01/2012
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11. Research approaches, adaptation strategies, and knowledge gaps concerning the impacts of climate change on plant diseases
This review discusses the present trends in studies on the impacts of climate change on plant diseases. Firstly, the approaches used for studying the potential effects of altered temperature, water availability, CO2 and O3 air concentrations, and UV-B radiation on components of the disease cycle are explained and discussed. Next, the impact of changes in cli
Tropical Plant Pathology. Publicado em: 2012-02
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12. Análise do fenômeno da imunotolerância na fotocarcinogênese em lábio / Analysis of the immunotolerance phenomenon of in the lip photocarcinogenesis
Ultraviolet radiation (UV) is the main cause of non-melanoma skin cancer and induces biological effects that promote photocarcinogenesis by causing mutations directly on DNA. However, there seems to be an indirect effect, which induces immunosuppession. The physiological phenomenon of immune tolerance, which is responsible for the prevention of autoimmune di
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/12/2011