Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 367 for “"low dose"”.
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Epigenetic Response to Low-Dose Ionizing Radiation
<p>Low-dose ionizing radiation (LDIR) exposure (under 10.0 centigray (cGy)) from man-made sources, such as diagnostic imaging, predominates in the US population and comprises nearly 50% of an average individual's yearly radiation exposure (Ullrich, Brooks et al. 2009). The increase in such …
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Towards low dose retrospective dosimetry on shelled species
… To determine applicable samples for low dose studies, shells of crustacean and mollusc species were irradiated to 10 Gy using a 137Cs source. Reference dosimetry was performed with alanine powder using a specifically developed calibration curve. Characteristic Mn2+ signals were …
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Low Dose Dosimetry and Radiation Response in Rodent Models
… models to investigate the carcinogenic risks of low dose radiation.
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Continuous low dose rate irradiation of the rat brain
… time may be achieved with the use of continuous low dose rate external beam radiotherapy, where the treatment is administered over a 12 to 24 hour period. A relationship between fractionated and continuous low dose rate irradiation has been reported for skin, however, no such relationship has …
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The Effects of Low Dose Endotoxin on Glucose Homeostasis
… and long-term increases in endotoxin of a low magnitude on insulin signaling in a human primary cell line as well as the effects of short-term endotoxin treatments on glucose homeostasis in a C57/Bl6 mouse model. First, we tested the hypothesis in cell culture that short-term low-dose …
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Personalised Risk Assessment of Low-dose Radiation Effects on Spermatogenesis
… arisen about the health effects of long-term, low-dose environmental radiation exposure and contamination. From the point of view of radiation microdosimetry, the energy deposition of radiation from low-dose exposure (such as from environmental radiation) is localised along its track, resulting …
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Adolescent Idiopathic Scoliosis. The Role of Low Dose Computed Tomography.
… in daily clinical practice means high radiation dose to these young individuals. All examinations included in this thesis were performed on a 16-slice CT scanner. Examination of the chest phantom in paper I showed that the radiation dose of the spine (including 15 vertebrae) was 20 times lower …
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Low Dose Analytical Electron Microscopy of Hybrid Perovskite Photovoltaic Devices
… interconnections within. A characterisation workflow consisting of cross-sectional specimen preparation, data acquisition, and multivariate statistical data analysis is developed and validated. Preparation of electron-transparent specimens is performed using focused ion beam milling, which is …
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A 3D Deep Learning Architecture for Denoising Low-Dose CT Scans
… designed to improve the image quality of low-dose computed tomography (LDCT) scans. Although LDCT scans are advantageous for reducing radiation exposure, they inherently suffer from reduced image quality. Our novel 3D DL architecture addresses this issue by effectively enhancing LDCT …
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Evaluating the effectiveness of analogies in an infographic on low-dose radiation
… this research is to address misconceptions about Low Dose Radiation (LDR) by using analogies. The nuclear industry has shown that trust is asymmetrical, meaning it is easily lost and hard to regain. This was evident in Saskatchewan, where a public inquiry in 2008 revealed a significant lack of …
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Clinical pharmacokinetics of low dose paclitaxel in Asian patients with nasopharyngeal carcinoma
The pharmacokinetics (PK) of low-dose paclitaxel in Asian patients with WHO Stage III nasopharyngeal carcinoma treated with a chemo-radiation regimen were determined and correlated with subjecta??s demographics, clinical parameters, outcome with the intent of optimizing therapeutic benefit to risk …
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The application of low dose SIMS to surface studies on compound semiconductors
… studies - and the use of SIMS in studying low coverage oxygen adsorption on MBE grown (111)PbTe and (100)GaAs surfaces. As a monitoring technique for surface preparation, SIMS shows the presence of oxygen on (100)GaAs at coverages below the detection limit of AES. The detection of both …
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The Effect of Low Dose, Long Term Calcium Infusions on Bone Metabolism
… human subjects were studied by means of a low dose, long term, intravenous calcium infusion delivered by a constant infusion pump. The rate of exogenous calcium replacement was varied from patient to patient and serially from study to study in the same patient. The data collected made it …
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The molecular effects of low dose fractionated radiation treatment on Ovarian Adenocarcinoma
… it has been shown in cell survival studies that low doses of radiation (less than 100cGy) induce an initial phase of hypersensitivity (HRS) to radiation in vitro. This HRS is most pronounced in radioresistant cells. A treatment regime involving 0.5 Gy radiation dose given 4 times with 8 hour …
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Can low-dose lithium supplementation protect against sarcopenic obesity in ovariectomized mice?
… Our lab has found that inhibiting GSK3 using low-dose lithium (Li) supplementation improves skeletal muscle function, elevates whole-body energy expenditure, and enhances insulin sensitivity in male mice. However, it is unknown whether GSK3 inhibition will have similar benefits in female mice …
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The use of low dose tricyclic antidepressants at Heideveld Community Health Centre
… STUDY: To describe how doctors are prescribing low dose antidepressants at Heideveld Community Health Centre. OBJECTIVES: 1. To determine how many patients are being prescribed low dose antidepressants at Heideveld Community Health Centre. 2. To see what sort of dosages are being prescribed as …
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Novel Mechanisms Underlying the Inflammatory Effects of Leptin and Low Dose Endotoxin
… of inflammatory complications include leptin and low dose endotoxin lipopolysaccharide (LPS). However, the mechanism underlying the involvement of these two mediators is not clearly understood. The purpose of this study is to understand the mechanism underlying inflammatory complications caused by …
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Irradiators for measuring the biological effects of low dose-rate ionizing radiation fields
… field. Particle type, energy spectrum, and dose-rate all affect biological response per unit dose. This thesis describes methods of spectral analysis, dosimetry, biological assays, and mathematical modeling for determining the relative biological response for low dose-rate fields. The …
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A novel low-dose approach to active detection of shielded high-Z materials
… mono-energetic gamma lines produced from low threshold, high-Q nuclear reactions can be used to detect the presence of high-Z material shielded in low- and medium-Z cargo. Specifically, this work establishes a research foundation to inform the eventual development and optimization of a new …
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An evaluation of theories concerning the health effects of low-dose radiation exposures
The danger of high, acute doses of radiation is well documented, but the effects of low-dose radiation below 100 mSv is still heavily debated. Four theories concerning the effects of lowdose radiation are presented here: supra-linearity, linear-no-threshold (LNT), threshold, and hormesis. The …
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