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Dissertations / Theses on the topic 'Ultraviolet radiation Physiological effect'

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Published: 4 June 2021

Last updated: 20 February 2023

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1

Welsh, Belinda M. "Retinoid augmentation of ultraviolet radiation induced melanogenesis." Thesis, The University of Sydney, 1997. https://hdl.handle.net/2123/27563.

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The capacity of human skin to increase it's pigmentation in response to sunlight is an important protective mechanism employed by the body against the potential harmful effects of excess ultraviolet radiation These include the development of skin cancer and premature aging of the skin. Intense scientific research, particularly over the past two decades, has led to a greater understanding of the biology of the pigment producing cells in the skin, melanocytes, and their secretory product, melanin. Melanocyte function in the skin depends on a delicate and complex interaction with the surrounding

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2

Yam, Cheuk-sing, and 任卓昇. "The impact of ultraviolet light on cataract: a systematic review." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B45174969.

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3

Ladin, Loren Guerrero 1959. "Effect of ultraviolet light on reproduction in Hydra littoralis." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277085.

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The "DNA Damage Hypothesis" pertaining to the evolution of sex was tested using Hydra littoralis. DNA damage was produced by irradiating whole live hydra with ultraviolet light. A curve of uv light dosage vs. survival was constructed. Estimations of threshold fluence and LD50 were made from the survival curve. In four separate experiments, using various combinations of environmental temperatures, uv doses, and number of doses, frequencies of asexual and sexual reproduction were observed and compared. The hydra that received uv treatments did not show an increase in the consequent amount of sex

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4

Howell, Anne C. "Effects of antioxidant vitamin treatment on UV-irradiated cells." Virtual Press, 1995. http://liblink.bsu.edu/uhtbin/catkey/941360.

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Ultraviolet (UV) radiation damages both eukaryotic and prokaryotic cells by causing the formation of free radicals which damage cell membranes and DNA. Antioxidant vitamins have been shown to protect cells from UV-induced damage by scavenging free radicals. The protection of skin and its normal flora is necessary for the health of individuals in resisting diseases caused by microorganisms and delaying the long-term damage caused by UV radiation.This research investigated the effects of the antioxidants vitamin A and ascorbic acid, as well as UV-irradiation on both prokaryotic (Staphylococcus e

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5

Vishvakarman, Devasenapathy. "Occupational exposure to ultraviolet radiation in Central Queensland." Thesis, Queensland University of Technology, 1999.

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6

Kovach, Matthew James. "Adaptive Advantages of Carotenoid Pigments in Alpine and Subalpine Copepod Responses to Polycyclic Aromatic Hydrocarbon Induced Phototoxicity." Thesis, University of North Texas, 2010. https://digital.library.unt.edu/ark:/67531/metadc28444/.

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Alpine zooplankton are exposed to a variety of stressors in their natural environment including ultraviolet radiation. Physiological coping mechanisms such as the accumulation of photoprotective compounds provide these zooplankton protection from many of these stressors. Elevated levels of carotenoid compounds such as astaxanthin have been shown to help zooplankton survive longer when exposed to ultraviolet radiation presumably due to the strong antioxidant properties of carotenoid compounds. This antioxidant capacity is important because it may ameliorate natural and anthropogenic stressor-in

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7

Meldrum, Lennox R. "Estimate of lifetime UV exposure for selected workers in South East Queensland." Thesis, Queensland University of Technology, 1998.

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8

Zhang, Zixin. "UVR transmission through clothing fabrics." Thesis, Queensland University of Technology, 1994. https://eprints.qut.edu.au/37170/1/37170_Zhang_1994.pdf.

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A new fabric transmission measuring system (FTMS) utilising a solar UV simulator and a broad band radiometer, has been designed and developed for fast assessment of the protection levels of clothing fabrics against the biological damage caused by sunlight. The radiometer has a spectral response similar to the erythema action spectrum for human skin. The advantages of the FTMS are simplicity, reliability, low cost and, most importantly, time-efficiency. It has a capacity to process sixty-five clothing samples in about twenty-five minutes. The FTMS was calibrated against a spectroradiometer. Th

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9

Ho, Wing-kwok, and 何永國. "Solar ultraviolet radiation: monitoring, dosimetry and protection." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31222675.

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10

Allman, Amy Jane. "Effects of UV radiation on Marfan syndrome cells in culture." Virtual Press, 1993. http://liblink.bsu.edu/uhtbin/catkey/879841.

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Ultraviolet radiation causes an alteration in DNA by modifying neighboring thymine bases resulting in the formation of a dimer. These dimers block the processes of transcription and translation and ultimately no protein is synthesized and the cell dies. However, DNA repair mechanisms correct this damage by excising the dimer from the DNA strand and inserting replacement bases which are joined to the original strand by DNA ligase. This allows transcription to resume and ultimately protein synthesis to take place.This research focused on determining the DNA damage and subsequent repair levels in

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11

Verma, Meera Mary. "On the effect of UV-irradiation on DNA replication in Escherichia coli." Title page, contents and summary only, 1985. http://web4.library.adelaide.edu.au/theses/09PH/09phv522.pdf.

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12

Schoen, David Jay 1962. "The effects of retinoids and carotenoids on the in vitro function of human monocytes treated with ultraviolet light." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276640.

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Human peripheral blood monocytes provide a model for the in vivo exposure to, and immune functional damage caused by chronic UVB exposure at the skin surface. Retinoids and carotenoids are known immune function enhancers; they can also prevent cellular toxic product formation caused by UVB exposure. Application of these compounds in vitro may prevent functional damage to monocytes. Monocytes were exposed in vitro to UVB, then assayed for cytotoxic, phagocytic, and antigen presenting abilities. Phagocytic activity was protected from UVB damage by exposure to these compounds; cytotoxic activity

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13

Cobb, Jennifer L. "Validation of a Sun-Exposure Questionnaire for Adolescent Girls." Fogler Library, University of Maine, 2001. http://www.library.umaine.edu/theses/pdf/CobbJL2001.pdf.

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14

Wilcox, Stephany Vanessa. "Molecular diagnostic approach to determine the degree of photoaging of the skin." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96779.

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Thesis (MScMedSc)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: Context: Excessive exposure to ultraviolet radiation (UV) results in the risk of acquiring long-term harmful effects such as photoaging, which is characterised by deep wrinkles, roughness, dyspigmentation and an increased loss in elasticity. As a result, the detection of photoaging at an early stage is crucial to improving morbidity, whilst preventing the advancement of skin cancer. Aim: The aim of the study was to develop and to validate a diagnostic real-time PCR method in order to establish the gene expression profi

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15

Saul, Alison Nicole. "Psycho-physiological stress and its effects on ultraviolet light induced inflammation, DNA damage, and skin carcinogenesis." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1172850801.

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16

McGlade, Jacqueline Patricia. "Suppression of the asthmatic phenotype in mice by UVB irradiation." University of Western Australia. School of Paediatrics and Child Health, 2008. http://theses.library.uwa.edu.au/adt-WU2009.0086.

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Background: Exposure of skin to UVB radiation (290-320 nm) modulates the immune system, with most studies showing a suppression of Th1-driven immune responses. Investigations into the effects of UVB exposure on allergic respiratory responses have been limited. This study investigated the systemic effects of UVB on Th2-associated immune responses using two different murine models of allergic respiratory inflammation. The mechanism of immune regulation was also examined. Methods and Results: Two murine models of asthma were used: the papain model and the ovalbumin (OVA) model using papain and OV

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17

Wright, Caradee Yael, and n/a. "UVR exposure of NZ schoolchildren." University of Otago. Dunedin School of Medicine, 2007. http://adt.otago.ac.nz./public/adt-NZDU20070817.093312.

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Excess exposure to solar ultraviolet radiation (UVR) is the only readily modifiable skin cancer risk factor, and childhood exposure is implicated in melanoma aetiology. To assist the design and evaluation of child sun protection interventions in the school and community context, this first comprehensive study used electronic monitors to record time-stamped, second-by-second UVR exposure of 325 children (from 28 randomly selected New Zealand primary schools) who kept a diary record of concurrent activities and sun-protective practices and completed a sun-related knowledge, attitudes and usual b

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18

Ruscas, Ligia Ioana. "Effets antiinflammatoires des lymphocytes irradiés par les rayons UV: induction d'IL-1Ra et d'IL-10 par les monocytes macrophages." Doctoral thesis, Universite Libre de Bruxelles, 2005. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211036.

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Par leur capacité de moduler la réponse immune, les rayons ultraviolets (UV) ont trouvé des applications dans le traitement de diverses maladies immunes. Leurs mécanismes d’action sont encore incomplètement définis. L’un d’entre eux comporte l’induction de cytokines immunosuppressives et antiinflammatoires. Ce processus peut être provoqué par la phagocytose de corps apoptotiques, l’apoptose constituant une des lésions cellulaires élémentaires provoquée par les UV. Le but de notre travail a été de préciser les cytokines impliquées dans la réponse aux UV, de définir certains mécanismes de leur p

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19

Mizdrak, Jasminka. "Human lens chemistry: UV filters and age-related nuclear cataract." Australia : Macquarie University, 2007. http://hdl.handle.net/1959.14/16855.

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"A thesis submitted in partial fulfillment of the requirements for the award of the degree of Doctor of Philosophy".<br>Thesis (PhD) -- Macquarie University, Division of Environmental and Life Sciences, Dept. of Chemistry and Biomolecular Sciences, 2007.<br>Bibliography: p. 243-277.<br>Introduction -- A convenient synthesis of 30HKG -- Facile synthesis of the UV filter compounds 30HKyn and AHBG -- Synthesis, identification and quantification of novel human lens metabolites -- Modification of bovine lens protein with UV filters and related metabolites -- Effect of UV light on UV filter-treated

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20

Kaplan, Jefferson Coker. "Effect of UV irradiation on properties of hot pressed aluminum nitride." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/19480.

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21

Li, Dongyun. "The effect of UV-laser radiation on lenses and lens proteins." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/27271.

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22

Aguilar, Lara Karla. "Effect of ultraviolet/visible radiation processing on the quality of fruit juices." Doctoral thesis, Universitat de Lleida, 2017. http://hdl.handle.net/10803/405804.

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Aquest treball va estudiar la irradiació ultraviolada-visible (UV-Vis) com una alternativa per a la pasteurització de sucs. Els resultats van mostrar que la irradiació ultraviolada no produeix hidroximetilfurfural i es capaç de degradar-lo. Es va proposar un mecanisme de foto-degradació i es van usar diferents models cinètics per descriure la reacció. La foto-degradació de la vitamina C va ser insignificant usant una làmpada d’emissió múltiple. A més, el processament d’UV-Vis va ser efectiu inactivant els enzims polifenoloxidasa i peroxidasa; a major temperatura major inactivació. Mentrestant,

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23

Malallah, Yousef Abdalaziz. "A study of the effect of ultraviolet radiation on normal human skin." Thesis, University of Dundee, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364698.

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24

Parisi, A. "A new method using a dosimetric technique to evaluate ultraviolet spectra and doses for application to plants." Thesis, Queensland University of Technology, 1996.

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25

Rafferty, Teresa S. "The effect of selenium on ultraviolet-B radiation-induced damage to the skin." Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/22570.

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Selenium (Se) is a trace element found in many food sources, it is incorporated into specific selenoproteins. These include glutathione peroxidase and thioredoxin reductase which have strong antioxidant functions. In mice Se supplementation can reduce the number of skin tumours formed after UV irradiation. The purpose of the present thesis research was to characterise these protective mechanisms. To assess the effect of Se supplementation on UV irradiation of the skin, human skin cells were grown <i>in vitro</i> and supplemented with Se. Selenoprotein profiles were characterised by <sup>75</su

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26

Coombs, Anne-Marie. "A study of near-ultraviolet radiation induced oxidative damage in Escherichia coli." Thesis, University of Bath, 1988. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380929.

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27

Johnson, William H. "Lost life expectancy rate survey meter." Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/16408.

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28

Matallana, Surget Sabine-Astrid Biotechnology &amp Biomolecular Sciences Faculty of Science UNSW. "Physiological and molecular responses of the marine oligotrophic ultramicrobacterium Sphingopyxis Alaskensis rb2256 to visible light and ultraviolet radiation." Awarded By:University of New South Wales. Biotechnology & Biomolecular Sciences, 2009. http://handle.unsw.edu.au/1959.4/43251.

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Ultraviolet radiation reaching the Earths surface (UVR, 280-400 nm) may penetrate deep into the clear oligotrophic waters influencing a large part of the euphotic layer. Marine heterotrophic bacteria at the surface of the oceans are especially sensitive to the damaging solar radiation due to their haploid genome with little or no functional redundancy and lack of protective pigmentation. In a context of climate change and ozone depletion, it is clearly important to understand the physiology and underlying molecular UVR responses of abundant marine bacteria species. We chose the marine ultrami

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29

Matallana, Surget Sabine. "Physiological and molecular responses of the marine oligotrophic ultramicrobacterium Sphingopyxis alaskensis RB2256 to visible light and ultraviolet radiation." Paris 6, 2009. http://www.theses.fr/2009PA066080.

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Les rayonnements ultraviolets (UVR) pénétrent en profondeur dans les eaux claires oligotrophes affectant une large part de la couche euphotique. Les bactérie hétérotrophes marines jouent un rôle fondamental dans la reminéralisation de la matière organique dissoute et sont spécialement sensibles aux UVR à la surface des océans. Dans un contexte de changement climatique et réduction de la couche d'ozone, il est fondamental de mieux comprendre la physiologie et la réponse de bactéries marines abondantes, exposées aux UVR. Nous avons choisi comme modèle d'étude, la bactérie Sphingopyxis alaskensis

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30

Davis, Christopher John. "Neuropharmacological investigations into the mechanisms of emesis caused by cytotoxic drugs and radiation." Thesis, University of Oxford, 1988. https://ora.ox.ac.uk/objects/uuid:b9afefde-a43e-415e-8754-ed2a8eaac620.

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31

Waiser, Marley J. "The effect of solar radiation on the microbial ecology and biogeochemistry of prairie wetlands." Thesis, Edinburgh Napier University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343410.

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32

MacKenzie, Joanna Leigh. "The effects of ultraviolet-B radiation on mutational parameters in Arabidopsis thaliana /." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82283.

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This project was designed to investigate the impact of natural levels of ultraviolet-B radiation on the genomic mutation rate in Arabidopsis thaliana. UV-B radiation is a known mutagen, but plants may have evolved mechanisms to cope with any genomic damage induced by routine exposure to this radiation. In an attempt to determine whether the genomic mutation rate in a plant species is elevated in the presence of UV-B, two eleven generation mutation accumulation studies were preformed. One study incorporated levels of UV-B similar to that encountered on a clear mid-summer's day, while the

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33

Fatnasare, Ike S. "A study of the effect of water-pick up of UV curable offset ink on its curing time and its end use properties /." Online version of thesis, 1993. http://hdl.handle.net/1850/11169.

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34

Smith, Andrew E. "The effect of enhanced ultraviolet-B radiation on the photosynthetic metabolism of terrestrial Antarctic plants." Thesis, Anglia Ruskin University, 2009. https://arro.anglia.ac.uk/id/eprint/581959/1/Andrew%20Edwin%20Smith%20thesis.pdf.

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The potential effect of increased UV-B radiation on photosynthetic activity and related processes in a range of terrestrial Antarctic plant species was investigated; from a chlorophyte alga to a vascular plant (Deschampsia antartica). The relative contribution of the UV-B waveband to photosystem II (PSII) damage was used to construct an action spectrum for those species found to be sensitive to UV-B exposure. Investigation involved non-invasive measurements of photosynthesis using chlorophyll-a fluorescence emission coupled with polarographic measurement of oxygen and infra-red gas analysis

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35

Smith, Andrew E. "The effect of enhanced ultraviolet-B radiation on the photosynthetic metabolism of terrestrial Antarctic plants." Thesis, Anglia Ruskin University, 2009. http://arro.anglia.ac.uk/581959/.

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The potential effect of increased UV-B radiation on photosynthetic activity and related processes in a range of terrestrial Antarctic plant species was investigated; from a chlorophyte alga to a vascular plant (Deschampsia antartica). The relative contribution of the UV-B waveband to photosystem II (PSII) damage was used to construct an action spectrum for those species found to be sensitive to UV-B exposure. Investigation involved non-invasive measurements of photosynthesis using chlorophyll-a fluorescence emission coupled with polarographic measurement of oxygen and infra-red gas analysis of

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36

Dev, Kumar Govindaraj. "Effect of Ozone and Ultraviolet Irradiation Treatments on Listeria monocytogenes Populations in Chill Brines." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/35954.

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The efficacy of ozone and ultraviolet light, used in combination, to inactivate Listeria monocytogenes in fresh (9% NaCl, 91.86% transmittance at 254 nm) and spent chill brines (20.5% NaCl, 0.01% transmittance at 254 nm) was determined. Preliminary studies were conducted to optimize parameters for the ozonation of â freshâ and â spentâ brines. These include diffuser design, comparison of kit to standard methods to measure residual ozone, studying the effect of ozone on uridine absorbance and determining presence of residual listericidal activity post ozonation. An ozone diffuser was de

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37

Wong, H. M. "Probing the interactions between iron nutrition, salinity and ultraviolet-B radiation on the physiological responses of wheat (Triticum aestivum L.)." Diss., Lincoln University, 2009. http://hdl.handle.net/10182/1327.

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When plants are exposed to multiple environmental stress factors, one form of stress can affect the response to another stress. This study used seedlings of a new cultivar of wheat(Triticum aestivum L. cv. 1862), grown under factorial combinations of two levels of ultraviolet-B (UV-B)radiation, two salinity regimes and two levels of iron treatment in chelator-buffered nutrient solutions in a growth chamber. A number of morphological and physiological measurements were made. The accumulation of chlorophyll, UVabsorbing compounds and proline in shoots, as well as phytosiderophores (PSs) in root

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38

Fris, Miroslav. "The effect of single and repeated ultraviolet radiation on the anterior segment of the rabbit eye." Doctoral thesis, Norwegian University of Science and Technology, Department of Neuroscience, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-2110.

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<p>Over the last two decades, depletion of stratospheric ozone has increased the flux of ultraviolet radiation (UVR) at the surface of the earth and the cumulative effect of UVR has become an important aspect of UV-induced eye damage. Epidemiological studies generally assess the chronic, low dose UVR exposure conditions while the laboratory animal experiments usually examine the acute response to high dose exposures. Thus, the study conditions are dissimilar and we are not free to assume that the two variant experimental settings necessarily trigger the same damage or repair mechanism. In orde

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39

Borke, Michael Faison. "Modification of x-ray tissue doses with strong magnetic fields." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/17905.

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40

Ilnytskyy, Yaroslav, and University of Lethbridge Faculty of Arts and Science. "Non-targeted effects of ionizing radiation in vivo : epigenetic aspects / Yaroslav Ilinytskyy." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Biomolecular Sciences, [c2010], 2010. http://hdl.handle.net/10133/2630.

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The classical paradigm of radiation biology is based on the notion that ionizing particle has to traverse a nucleus of a living cell in order to damage genetic material either directly or via production of short living free radicals. After DNA damage is introduced it can be either safely repaired and the cell can continue divisions unaltered; or it can result in a failure to repair and cells death; or finally, upon misrepair, the cell would be carrying genetic alteration that could result in cancer or developmental abnormality. Therefore modern risk estimations are based on the notion that nuc

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41

Parker, Nicole Renee. "The role of kynurenine and UV light in lens protein modification." Access electronically, 2005. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20060720.111305/index.html.

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Thesis (Ph.D.)--University of Wollongong, 2005.<br>Typescript. EMBARGOED - This thesis is subject to a 12 month embargo (07/03/06 to 07/03/07) and may only be viewed and copied with the permission of the author. For further information please Contact the Archivist. Includes bibliographical references: leaf 236-266.

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42

陳木華 and Mok-wah Chan. "Exposures to artificial sources of ionising radiation in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1989. http://hub.hku.hk/bib/B31208496.

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43

Mwanza, Patrick. "Determination of the effects of sunlight and UV irradiation on the structure, viability and reapplication frequency of the biopesticide cryptophlebia leucotreta granulovirus in the protection against false codling moth infestation of citrus crops." Thesis, Nelson Mandela Metropolitan University, 2015. http://hdl.handle.net/10948/6346.

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Cryptophlebia leucotreta granulovirus (CrleGV-SA) is a baculovirus specifically pathogenic to the citrus pest false codling moth, Thaumatotibia leucotreta. CrleGV- SA is formulated as a commercial biopesticide, Cryptogran® (River Bioscience, South Africa). The virus has a stable, proteinaceous crystalline occlusion body (OB) that protects the nucleocapsid. The major limitation to the use of baculoviruses is their susceptibility to the ultraviolet (UV) component of sunlight, which rapidly and greatly reduces their efficacy as biopesticides. The UVA and UVB components are the most destructive to

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44

Kuffner, Ilsa Boysen. "The Effects of Ultraviolet Radiation on Reef Corals and the Sun-Screening Role of Mycosporine-like Amino Acids." Thesis, University of Hawai'i, Honolulu, 1999. http://hdl.handle.net/10125/15319.

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Shallow-dwelling scleractinian corals live in high irradiance environments where they are exposed to large fluxes of ultraviolet radiation (UVR, 280 - 400 nm). A suite of UV-aborbing compounds, know as mycosporine-like amino acids, is found within the tissues of coral-algal symbioses and may perform a sun-screening role. The seasonal variation in MAA concentration was investigated for two corals in Kaneohe Bay, Hawai'i, Porites compressa and Montipora verrucosa. Regressions of MAA concentration and the amount of UVR measured prior to collection date were not significant for total MAA concentra

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45

Anouti, Abdel Rahman Jamil. "THE INFLUENCE OF WAVELENGTH SELECTIVE GREENHOUSE FILMS ON ENERGY CONSUMPTION AND PRODUCTION OF FLORICULTURAL CROPS." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275442.

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46

Huang, Bingsheng, and 黃炳升. "Radiation dose and cancer risk of cardiac CT scan and PET-CT scan." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B41757993.

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47

Khan, Shanchita R. "Effect of sunlight exposure on 25-Hydroxyvitamin D concentration." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/115121/2/Shanchita%20Khan%20Thesis.pdf.

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Sunlight generates vitamin D, but there is scant human data from randomised trials on which to base health policy advice about how much sun exposure is necessary to change 25(OH)D concentrations. This thesis studies the effect of solar ultraviolet (UV) radiation exposure on 25(OH)D concentration in a randomised controlled trial. The intervention group received nine standard erythemal dose of UV radiation over three weeks which caused a 2.5 nmol/L higher increase than that in the control group, although this was not statistically significant. This study identifies key issues to be considered in

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48

Park, Young C. (Young Chul) 1960. "A Study of Some Biological Effects of Non-Ionizing Electromagnetic Radiation." Thesis, University of North Texas, 1996. https://digital.library.unt.edu/ark:/67531/metadc278105/.

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The experimental studies of this work were done using a microwave cavity spectrometer, Escherichia coli (E-coli) bacteria, and other peripheral equipment. The experiment consists of two steps. First, a general survey of frequencies from 8 GHz to 12 GHz was made. Second, a detailed experiment for specific frequencies selected from the first survey were further studied. Interesting frequency dependent results, such as unusually higher growing or killing rates of E-coli at some frequencies, were found. It is also concluded that some results are genetic, that is, the 2nd, and 3rd subcultures showe

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49

Nabasenja, Caroline. "Radiation doses for barium meals and barium enemas in the Western Cape South Africa." Thesis, Cape Peninsula University of Technology, 2009. http://hdl.handle.net/20.500.11838/1560.

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Thesis submitted in fulfilment of the requirements for the award of the degree of Master of Technology Radiography (Diagnostic) in the Faculty of Health and Wellness Sciences at the Cape Peninsula University of Technology 2009<br>Since their discovery in 1895, the use of x-rays is continuously evolving in medicine making the diagnosis of injuries and diseases more practicable. It is therefore not surprising that x-rays contribute 90% of the radiation dose to the population from manmade sources (DWP, 1992). Moreover, these radiation doses are associated with both fatal and non-fatal cancer risk

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Zerabruk, MA. "Repair of sub-lethal damage following single and split-dose irradiation using 60co-gamma and p(66)Be neutrons." Thesis, Cape Peninsula University of Technology, 2005. http://hdl.handle.net/20.500.11838/1504.

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Thesis (MTech Biomedical Technology)--Cape Peninsula University of Cape Town, 2005<br>In clinical radiotherapy, experiments are performed to determine optimal conditions of the radiation prior to radiotherapy. These experiments focus on the relative biological effectivness(RBE) determination and are predominantly applied in high linear energy transfer (LET) radiations i.e. fast neutrons, as the RBE values for such radiations vary greatly. In general, the RBE of a certain radiation relative to a given reference radiation flCo gamma) varies widely with the energy, dose, dose rate, frac

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