Radiation Doses
Mostrando 25-36 de 572 artigos, teses e dissertações.
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25. Evaluation of radiation protection conditions in intraoral radiology
Abstract Introduction: The dental radiology represents about 20% of human exposure to radiation in radio diagnostic. Although the doses practiced in intraoral dentistry are considered low, they should not be ignored due to the volume of the performed procedures. This study presents the radiation protection conditions for intraoral radiology in Curitiba - PR
Res. Biomed. Eng.. Publicado em: 17/05/2016
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26. Effect of Gamma Radiation on Growth and Metabolic Activities of Arthrospira platensis
This work aimed to study the influence of gamma radiation on the growth and production of some active substances of Arthrospira platensis. Biomass production was significantly inhibited (p ≤ 0.05) by 21 and 34%, with respect to the control at 2.0 and 2.5 kGy, respectively. Chlorophyll-a content showed 11% reduction at 2.5 kGy compared to the control. As a
Braz. arch. biol. technol.. Publicado em: 29/04/2016
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27. Micro-CT evaluation of the radioprotective effect of resveratrol on the mandibular incisors of irradiated rats
Abstract The purpose of this study was to perform a microcomputed tomographic evaluation of the radioprotective effect of resveratrol on the volume of mandibular incisors of irradiated rats. A second aim was to make a quantitative assessment of the effect of x-ray exposure on these dental tissues. Twenty adult male rats were divided into four groups: control
Braz. oral res.. Publicado em: 08/03/2016
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28. Radiation dose determines the method for quantification of DNA double strand breaks
RESUMO A radiação ionizante induz a rupturas dos filamentos duplos (DSBs) do DNA que ativam a fosforilação da proteína histona H2AX (γH2AX). A coloração por imunofluorescência visualiza a formação de focos de γH2AX, permitindo a sua quantificação. Esse método, em oposição ao ensaio de Western blot e citometria de fluxo, fornece uma análise
An. Acad. Bras. Ciênc.. Publicado em: 04/03/2016
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29. P(VDF-TrFE)/ZrO2 Polymer-Composites for X-ray Shielding
Poly(vinylidene fluoride – tryfluorethylene) [P(VDF-TrFE)] copolymers were mixed with zirconia nanoparticles. The investigation was conducted with the intention to produce nanocompounds with potential to be used as protective patient shielding in radiological procedures. Polymer based nanocomposites with 1, 2, 3, 5 and 10 wt% of ZrO2 nanoparticles were pre
Mat. Res.. Publicado em: 26/02/2016
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30. Spine radiosurgery for the local treatment of spine metastases: Intensity-modulated radiotherapy, image guidance, clinical aspects and future directions
Many cancer patients will develop spinal metastases. Local control is important for preventing neurologic compromise and to relieve pain. Stereotactic body radiotherapy or spinal radiosurgery is a new radiation therapy technique for spinal metastasis that can deliver a high dose of radiation to a tumor while minimizing the radiation delivered to healthy, nei
Clinics. Publicado em: 2016-02
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31. Effect of high energy X-ray irradiation on the nano-mechanical properties of human enamel and dentine
Abstract Radiotherapy for malignancies in the head and neck can cause common complications that can result in tooth damage that are also known as radiation caries. The aim of this study was to examine damage to the surface topography and calculate changes in friction behavior and the nano-mechanical properties (elastic modulus, nanohardness and friction coef
Braz. oral res.. Publicado em: 15/12/2015
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32. Planting spacing and NK fertilizing on physiological indexes and fruit production of papaya under semiarid climate
ABSTRACT The nutritional requirements of papaya (Carica papaya L.) increase continuously throughout the crop cycle, especially for potassium and nitrogen, which are the most required nutrients and act on plant vital functions such as photosynthetic activity, respiration, transpiration and stomatal regulation. An experiment was conducted from November 2010 to
Bragantia. Publicado em: 04/12/2015
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33. Skin Doses on the Lens for Temporomandibular Joint Exam in Cone Beam Computed Tomography
ABSTRACT The aim of this study was to evaluate the kerma at the surface of the lens in TMJ CBCT and to derive the equivalent dose. An anthropomorphic phantom of the head and neck manufactured by Radiation Support Devices (model RS-230) was used. The dosimetric measurements were obtained by using fourteen thermoluminescent dosimetry (TLD) dosimeters (LiF: Mg,
Braz. arch. biol. technol.. Publicado em: 2015-12
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34. 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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35. Efficacy Analysis of a Script-based Guide for EVAR Execution: is it Possible to Reduce Patient Exposure to Contrast, Operative Time and Blood Loss even when Advanced Technologies are not Available?
ABSTRACT INTRODUCTION: Despite the patient and medical staff exposure to radiation in endovascular aneurysm repair, the benefits of this abdominal aortic aneurysm type of surgical management are justfied by minor recovery time and hospitalization, as well as an option for patients not elected to conventional open repair. In this minimally invasive surgical
Braz. J. Cardiovasc. Surg.. Publicado em: 2015-12
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36. Essential Oil from Flowers of Solanum stipulaceum: Composition, Effects of γ-Radiation, and Antileukemic Activity
The composition of essential oils from flowers of Solanum stipulaceum Roem & Schult collected in May and September was studied for the first time. Effects of g-radiation on volatile constituents were investigated by gas chromatography (GC) with flame ionization detector (FID). In addition, the antileukemic activity was studied by a 3-(4,5-dimethylthiazol-2-y
J. Braz. Chem. Soc.. Publicado em: 2015-11