Дисертації з теми "Irradiation quality"
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Moreno, Tinjaca Maria Alexandra. "Effect of electron beam irradiation on quality and shelf-life of Tommy Atkins mango (Mangifera indica l.) and blueberry (Vaccinium corymbsum l.)." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4726.
Повний текст джерелаTewfik, Ihab Hamdy. "Rapid methods for the identification of gamma irradiated lipid containing foods." Thesis, London South Bank University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267387.
Повний текст джерелаSchmidt, Heather Martin. "Improving the microbiological quality and safety of fresh-cut tomatoes by low dose electron beam irradiation." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/2767.
Повний текст джерелаAnderson, Cody. "Benchmarking of different solar spectra quality control methods." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/201343/1/Cody_Anderson_Thesis.pdf.
Повний текст джерелаPalekar, Mangesh Prafull. "Attachment of Salmonella on cantaloupe and effect of electron beam irradiation on quality and safety of sliced cantaloupe." Texas A&M University, 2004. http://hdl.handle.net/1969.1/3285.
Повний текст джерелаSilva, Marcus Henriques da. "Efeitos da radiação gama do cobalto-60 em semente de café arábica e conillon: avaliação físico-química." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/64/64134/tde-18012013-141525/.
Повний текст джерелаBrazil is the largest producer and exporter of coffee in the world. The coffee bean is one of the main products of the Brazilian trade balance. Two species of coffee are the most economically important: the Coffea arabica L. and Coffea canephora Pierre is the largest representative of the Coffea canephora Pierre is the coffea conillon. Food irradiation is an area of research that aims to increase the shelf life of foods and controlling pests. This study aimed to verify the physicochemical variables of Arabica coffee and conillon were affected when exposed to doses of gamma radiation from cobalt-60. The samples were provided by Polo in Coffee Quality Technology, Federal University of Lavras - UFLA. The coffee samples were subjected to irradiation doses: 0 (control), 5 kGy and 10 kGy, a multipurpose irradiator of IPEN - Research Institute of Nuclear Energy and the University of São Paulo, at a rate of 7.5 kGy / hour. For irradiation the samples were vacuum-packed in appropriate packaging aluminised. After the process of irradiation the samples were stored at a temperature of 15 ± 1 º C and relative humidity of 17 ± 1%. The following analyzes were performed: levels of total sugars, glucose, sucrose, caffeine, humidity, pH, total acidity, electrical conductivity and fibers. Analyses were performed 1, 30, 60 and 90 days after irradiation, and the results were submitted to analysis of variance and means were compared by Tukey test at 5%. It was observed that the analysis results of the samples irradiated with 5 kGy and 10 kGy showed values similar to the control. It was concluded that irradiation did not induce deleterious effects on arabica coffee seeds and conillon irradiated with 5 kGy and 10 kGy to 90 days after irradiation
BOARATTI, MARIA de F. G. "Analise de perigos e pontos criticos de controle para alimentos irradiados no Brasil." reponame:Repositório Institucional do IPEN, 2004. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11224.
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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
Udrescu, Mihaela. "Développement d'une technique de radiothérapie stéréotaxique des cancers de la prostate reposant sur deux concepts différents de préservation de la paroi rectale." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10319/document.
Повний текст джерелаThe current work decribes the implementation of a protocol for stereotactic body radiotherapy (SBRT) combined with an intensity-modulated radiation therapy technique (IMRT). the project was initiated in the Department of Radiation-Oncology from Lyon Sud Hospital. The first part summarizes the state of the art of prostate cancer with a literature review on irradiation techniques. Three research themes were described and developped : The first theme discusses the optimal definition of the volumes to be irradiated during a prostate SBRT and the accuracy of the target localization using intraprostatic markers. The second theme of research describes the treatment planning for prostate SBRT having as main purpose an optimal protection of the rectal-wall with two different approaches: a) an augmentation of the dose with simultaneous integrated boost only into visible macroscopic tumor, or b) the use of a gel injected between the rectal-wall and the prostate. The optimal number of fields, as well as the most favorable energy, was evaluated in the context of the first approach with a simultaneous integrated boost. The third theme discusses the quality assurance (QA) that needs to be performed for an IMRT-SBRT technique. Three detectors that ara dedicated to the QA of dose distribution under accelerator were evaluated. The results of all these studies will be used for the implementation of a phase II study for prostate SBRT with an injection of hyaluronic acid between the rectum and the prostate
Hirashima, Hideaki. "Establishment of machine and patient-specific quality assurance methods for advanced volumetric modulated arc therapy." Kyoto University, 2019. http://hdl.handle.net/2433/242352.
Повний текст джерелаLe, roy Julien. "Optimisation des explorations tomodensitométriques des artères coronaires chez l’enfant atteint de cardiopathie congénitale." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTT058.
Повний текст джерелаCoronary computed tomography angiography (CCTA) has been increasingly used in pediatrics for diagnosis, follow-up, and pre or post-surgery assessment of coronary artery anomalies, and more generally in congenital heart diseases. However, its use remains limited by cardiac motion artifacts, potentially resulting in non-diagnostic acquisitions, and by children’s exposure associated with a risk of radiation induced cancers.The aim of this thesis was to evaluate and optimize CCTA performed in children with congenital heart disease.Fifty children (<18 years old), with congenital heart disease requiring coronary artery imaging were prospectively enrolled in the COROPEDIA clinical trial, specifically designed during the thesis (Observational study for feasibility and performance of sub-millisievert coronary computed tomography angiography for coronary artery anomalies in paediatric patients). Between 2017 and 2018, these children underwent a coronary CT angiography, performed on a wide-coverage, single-source CT. The first part of this work was dedicated to elaborating an optimized acquisition protocol, derived from adult studies (very few studies have been conducted with pediatric patients). Fifteen acquisition schemes were designed to deliver irradiation at the best theoretical moment, as a function of patient’s heart rate and variability. These selective multiphasic acquisitions fully answered the clinical question for every child, delivering a radiation dose equivalent to less than 4 months of natural background irradiation.Two additional studies were conducted to improve cardiac structure visualization while reducing further children’s exposure.The impact of motion correction algorithms in children undergoing CCTA was investigated. The results suggested that multiple phases provided significantly better interpretability than traditional single-phase acquisitions. However, the second motion correction algorithm generation offered similar interpretability in a single retrospectively processed cardiac phase and could be adopted to improve coronary artery visualization while reducing beam-on-time and children’s exposure to radiation.Finally, motion artifacts of every fifty patients were quantified in seven different cardiac phases. On a total of 5733 cardiac structures evaluated, optimal positions (70%, 80%, 40%, 47%, 50%, 54% of the R-R interval, respectively) and durations (10%, 20%, 50%, 50%, 20%, 10% of the cardiac cycle, respectively) of the acquisition window were defined as a function of children’s heart rates (≤60 bpm, 61-75 bpm, 76-85 bpm ; 86-100 bpm ; 101-130 bpm ; >130 bpm).These optimization strategies might be simultaneously implemented to achieve CCTA of diagnostic quality in any children, for less than 0.5 mSv, or two month of natural background irradiation
SUMIYA, LUIZ C. do A. "Estudo de parâmetros relevantes na irradiação de sup(124)Xe, visando a otimização na obtenção de sup(123)I ultra puro no ciclotron cyclone-30 IPEN-CNEN/SP." reponame:Repositório Institucional do IPEN, 2006. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11477.
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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
Pires, Juliana Angelo. "Efeito da radiação gama (60Co) em fermentado de jabuticaba, tipo vinho tinto." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-21062018-090921/.
Повний текст джерелаBrazilian grape tree is a tropical fruit, typically Brazilian, originating in the south-central region. Popularly appreciated for its sensory characteristics in natura, it is also used in products such as jellies, liqueurs and fermented beverages. Any fruit that contains reasonable levels of sugar is possible to produce a good wine, with flavors characteristic of each fruit. Fermented fruit is a beverage with alcohol content of four to fourteen percent by volume, at twenty degrees Celsius, obtained by the alcoholic fermentation of healthy, fresh and ripe fruit must. The aim of this work was to brew and irradiate Brazilian grape tree wine with gamma radiation (Co60) for possible precocious aging. For the manufacture of the wine were, the Brazilian grape tree were sanitized with Peracetic acid PAC 200 and 24kg of the selected fruits were pressed until the breakage of the berries. The must obtained together with the peels and seeds were placed in fermenter bucket. The must was treated with 2.4 g of sodium metabisulfite and after a few minutes 250g of yeasts Saccharomyces cerevisiae, type Fleishmann, and 2kg of sugar were added to correct soluble solids. The fermentation occurred for 7 days until the soluble solids were close to zero. Then the wine was filtered and centrifuged to remove yeast and bottled in dark glass containers. The containers were divided into four treatment groups (control and irradiated at doses of 5, 10 and 15kGy) for a storage period of 0, 60 and 120 days after irradiation, in triplicate. Physicochemical analyzes were performed: total soluble solids (TSS), pH, total acidity, volatile acidity, fixed acidity, alcohol content, anthocyanin content, tannins, chemical age and ash. Analysis was performed to determine yeast type after fermentation by PCR analysis. From the results obtained, it can be observed that, for the alcoholic content, the three doses used decreased the alcohol content, but during the analyzed days all the samples increased. Most of the standards have been presented within the current legislation. For quantification of anthocyanin, it was found that the higher the dose applied the greater the degradation of the same and also the same is observed for the analyzed time. For anthocyanin quantification, it was found that the higher the dose applied the greater the degradation of the same and also the same is observed for the analyzed time. For tannins quantification, it was observed that the increase of the dose causes them to decay, and that over time the tendency of them is to increase, whether irradiated or not. For chemical age analysis, it was observed that there was aging of the irradiated samples, but that the time factor is a great interferent in the initial effects caused by the radiation. For PCR analysis in the yeasts it was found that the initial yeast used had the same yeast DNA sequence harvested after the fermentation process. Therefore, it was concluded that the behavior of the pigmentation molecules that polymerized with irradiation, characteristic of aged wines, the \"red wine\" of Brazilian grape tree was aged and considering all the analyzes performed and the characteristics acquired, that the best doses were 5 and 10kGy and that the time of 120 days guarantees the stability required for this drink and that physico-chemical standards are within the legislation.
Moreira, Gláucia Cristina [UNESP]. "Radiação gama ou antimicrobianos naturais na conservação de melão minimamente processado." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/103244.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O presente trabalho teve por objetivo verificar os efeitos da radiação gama e de antimicrobianos naturais na conservação de melão minimamente processado, armazenado sob refrigeração. Foram realizados 4 experimentos: 1 e 2 - frutos de melão Cantaloupe e Pele de Sapo provenientes de Baraúna/RN e Juazeiro/BA, respectivamente; 3 e 4 - frutos de melão Cantaloupe e Gália provenientes da região de Cartagena (Espanha). Após a colheita, os frutos dos experimentos 1 e 2 foram transportados ao Laboratório de Frutas e Hortaliças da Faculdade de Ciências Agronômicas – UNESP – Botucatu/SP, e os dos experimentos 3 e 4 transportados para o Laboratório de Postrecolección e Refrigeración da Universidad Politécnica de Cartagena/Espanha. Após o processamento manual (corte em seções trapezoidais) os melões MP (minimamente processados) dos experimentos 1 e 2 foram acondicionados em embalagens de poliestireno expandido recobertas com filme de polietileno e irradiados nas doses: 0,0kGy; 0,1kGy; 0,2kGy; 0,3kGy; 0,4kGy e 0,5kGy. Os melões MP dos experimentos 3 e 4, após o processamento, foram imersos durante 1 minuto a 5ºC em: água (testemunha); vanilina (1000 mg L-1 e 2000 mg L-1); ácido cinâmico (148,16 mg L-1 e 296,32 mg L-1) e outros dois tratamentos consistiram em aplicação de vapor de ácido cinâmico (148,16 mg L-1 e 296,32 mg L-1) nos melões MP dentro da embalagem (bandejas de polipropileno termo seladas com filme de polipropileno). O armazenamento refrigerado foi realizado durante 10 dias 5±1ºC e 85-90% UR (experimentos 1 e 2) e à 5±1ºC e 85-95% UR (experimentos 3 e 4). As alterações na qualidade foram detectadas por meio das análises: perda de massa fresca, conservação pós-colheita, firmeza, pH, acidez titulável, sólidos solúveis, teores de açúcares redutores e redutores totais, ácido ascórbico, vitamina C, taxa respiratória, produção de etileno...
The aim of this research was to evaluated the effects of the gamma radiation and the natural antimicrobials in the conservation of fresh-cut melon storaged under refrigeration. Four experiments were accomplished: 1 and 2 – the varieties used were ‘Cantaloupe’ and ‘Pele de Sapo’ from Baraúna/RN and Juazeiro/BA, respectively; 3 and 4 - the varieties used were ‘Cantaloupe’ and ‘Gália’ from Cartagena (Spain). After harvesting, fruits from experiment 1 and 2 were sent to the Laboratory of Fruits and Vegetables at the University of Sao Paulo State (UNESP – Botucatu/SP). Fruits from experiment 3 and 4 were sent to the Postharvest and Refrigeration Group at the Technical University of Cartagena/Spain. After the manual processing (cut in trapezoidal sections) the fresh-cut melons of the experiment 1 and 2 were conditioned in polystyrene trays involved by polyethylene film and irradiated with doses: 0,0kGy; 0,1kGy; 0,2kGy; 0,3kGy; 0,4kGy and 0,5kGy. After processing, fresh-cut melons from experiment 3 and 4 were immersed for 1 min at 5ºC in water (control); vanillin (1000 mg L-1 and 2000 mg L-1); cinnamic acid (148,16 mg L- 1 and 296,32 mg L-1). Two additional treatments consisted on the application of cinnamic acid vapor (148,16 mg L-1 e 296,32 mg L-1) on fresh-cut melons within the packages (polypropylene trays heat-sealed with polypropylene). The storage was realized during 10 days in a cold camera to 5±1ºC and 85-90% HR (experiment 1 and 2) and to 5±1ºC and 85- 95% HR (experiment 3 and 4). The quality alterations were detected through the analyses: loss of fresh mass, postharvest conservation, firmness, pH, acidity titratable, soluble solids, reducing and total reducing sugar content, ascorbic acid, vitamin C, respiration rate, ethylene production, gas composition (CO2 and O2), enzymes activity (peroxidase, polygalacturonase and pectinmethylesterase), antioxidant... (Complete abstract click electronic access below)
Camargo, Fabiana Taveira de. "Crescimento e maturação do fruto de café (Coffea arabica L.) em sistema arborizado e em monocultivo." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/11/11136/tde-19062007-095221/.
Повний текст джерелаIn the searching for climatic conditions to minimize negative effects of high temperature and radiation excess, the shading system can make possible the Brazilian coffee crop. This research aimed to evaluate the growth and maturation of coffee fruits and its productivity under different levels of natural irradiance. Coffee plants were planted inside and aside of a rubber trees plantation and in monocrop. The irradiance gradient level available to coffee plants at different distances from rubber trees were of 40, 45, 80 and 100% and characterized the treatments. The accumulation of the fruits dry matter was evaluated in the phases of the fruiting / fructification and the productivity. In the fruit set (pellet-like berries), expansion and seed-filling stage phases, that increment varies according to the fruits amount in the plant. The expansion depends on the radiation and the seed-filling stage depends on the reserve deposition time. The dry matter increment of "green fruits", "green-cane" and "cherry" coffee fruits is superior in the shaded plants up to 80% of brightness with shade at afternoon. The productivity (grains.planta-1) increases proportionally to the available irradiância, while the expansion, the maturation and its uniformity are also benefited up to 80% available irradiance.
DANTAS, DANIELLE M. "Toxicidade aguda e subaguda do radiofármaco sup(18)F-FDG." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10541.
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Dissertação (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Moreira, Gláucia Cristina 1981. "Radiação gama ou antimicrobianos naturais na conservação de melão minimamente processado /." Botucatu : [s.n.], 2009. http://hdl.handle.net/11449/103244.
Повний текст джерелаBanca: Giuseppina Pace Pereira Lima
Banca: Vera Lúcia Mores Rall
Banca: Maria Monteiro Sigrist
Banca: Nelida Lúcia Del Mastro
Resumo: O presente trabalho teve por objetivo verificar os efeitos da radiação gama e de antimicrobianos naturais na conservação de melão minimamente processado, armazenado sob refrigeração. Foram realizados 4 experimentos: 1 e 2 - frutos de melão Cantaloupe e Pele de Sapo provenientes de Baraúna/RN e Juazeiro/BA, respectivamente; 3 e 4 - frutos de melão Cantaloupe e Gália provenientes da região de Cartagena (Espanha). Após a colheita, os frutos dos experimentos 1 e 2 foram transportados ao Laboratório de Frutas e Hortaliças da Faculdade de Ciências Agronômicas - UNESP - Botucatu/SP, e os dos experimentos 3 e 4 transportados para o Laboratório de Postrecolección e Refrigeración da Universidad Politécnica de Cartagena/Espanha. Após o processamento manual (corte em seções trapezoidais) os melões MP (minimamente processados) dos experimentos 1 e 2 foram acondicionados em embalagens de poliestireno expandido recobertas com filme de polietileno e irradiados nas doses: 0,0kGy; 0,1kGy; 0,2kGy; 0,3kGy; 0,4kGy e 0,5kGy. Os melões MP dos experimentos 3 e 4, após o processamento, foram imersos durante 1 minuto a 5ºC em: água (testemunha); vanilina (1000 mg L-1 e 2000 mg L-1); ácido cinâmico (148,16 mg L-1 e 296,32 mg L-1) e outros dois tratamentos consistiram em aplicação de vapor de ácido cinâmico (148,16 mg L-1 e 296,32 mg L-1) nos melões MP dentro da embalagem (bandejas de polipropileno termo seladas com filme de polipropileno). O armazenamento refrigerado foi realizado durante 10 dias 5±1ºC e 85-90% UR (experimentos 1 e 2) e à 5±1ºC e 85-95% UR (experimentos 3 e 4). As alterações na qualidade foram detectadas por meio das análises: perda de massa fresca, conservação pós-colheita, firmeza, pH, acidez titulável, sólidos solúveis, teores de açúcares redutores e redutores totais, ácido ascórbico, vitamina C, taxa respiratória, produção de etileno... (Resumo completo, clicar acesso electrônico abaixo)
Abstract: The aim of this research was to evaluated the effects of the gamma radiation and the natural antimicrobials in the conservation of fresh-cut melon storaged under refrigeration. Four experiments were accomplished: 1 and 2 - the varieties used were 'Cantaloupe' and 'Pele de Sapo' from Baraúna/RN and Juazeiro/BA, respectively; 3 and 4 - the varieties used were 'Cantaloupe' and 'Gália' from Cartagena (Spain). After harvesting, fruits from experiment 1 and 2 were sent to the Laboratory of Fruits and Vegetables at the University of Sao Paulo State (UNESP - Botucatu/SP). Fruits from experiment 3 and 4 were sent to the Postharvest and Refrigeration Group at the Technical University of Cartagena/Spain. After the manual processing (cut in trapezoidal sections) the fresh-cut melons of the experiment 1 and 2 were conditioned in polystyrene trays involved by polyethylene film and irradiated with doses: 0,0kGy; 0,1kGy; 0,2kGy; 0,3kGy; 0,4kGy and 0,5kGy. After processing, fresh-cut melons from experiment 3 and 4 were immersed for 1 min at 5ºC in water (control); vanillin (1000 mg L-1 and 2000 mg L-1); cinnamic acid (148,16 mg L- 1 and 296,32 mg L-1). Two additional treatments consisted on the application of cinnamic acid vapor (148,16 mg L-1 e 296,32 mg L-1) on fresh-cut melons within the packages (polypropylene trays heat-sealed with polypropylene). The storage was realized during 10 days in a cold camera to 5±1ºC and 85-90% HR (experiment 1 and 2) and to 5±1ºC and 85- 95% HR (experiment 3 and 4). The quality alterations were detected through the analyses: loss of fresh mass, postharvest conservation, firmness, pH, acidity titratable, soluble solids, reducing and total reducing sugar content, ascorbic acid, vitamin C, respiration rate, ethylene production, gas composition (CO2 and O2), enzymes activity (peroxidase, polygalacturonase and pectinmethylesterase), antioxidant... (Complete abstract click electronic access below)
Doutor
Al, Khawaja Mohamad Safa. "Quel niveau de qualité de traitement peut être obtenu par un système d'irradiation robotisé guidé par l'image en radiothérapie (CyberKnife TM)." Electronic Thesis or Diss., Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL076N.
Повний текст джерелаThe CyberKnifeTM consists of 6MV LINAC mounted on a robotic arm, with six degree of freedom and is coupled to an image guiding system, allowing us to guide the irradiation beams toward the target. The aim is to improve the treatment accuracy and to reduce the irradiation of critical surrounding organs. The treatment is realized by the isotropic convergence of hundreds of orientations for creating up to 1200 mini-beams, which are orientated to the target with submillimetric accuracy. This group is completed by a treatment couch, which is also mounted on a robotized arm, that offers 6 additional degrees of freedom, allowing an additional improvement of accuracy, and eliminates the possible limitations. Using its subsystem SynchronyTM, the CyberKnifeTM is capable of treating the abdo -thoracic tumors, which move with respiration, by moving dynamically the LINAC to compensate the respiratory motion of the tumors. The high dose level, which is used in this kind of hypofractionated treatment, makes the smallest error unacceptable, and needs a very high geometric accuracy with keeping a maximal dosimetric accuracy. Our work is dedicated to evaluate the quality of treatment, in the terms of dosimetric and geometric accuracies. For the different modes of tracking, which are available in the system in static mode, and dynamic mode with respiratory motion tracking. By using different kinds of detectors (ionization chambers, radiochromic films) and three different platforms, which allow simulating simple respiratory motion, real respiratory motion coming from real treated patients, and finally complex motion with hysteresis
Miranda, Mariana Branco de. "Avaliação físico-química de cachaças comerciais e estudo da influência da irradiação sobre a qualidade da bebida em tonéis de carvalho." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/11/11141/tde-18112005-144555/.
Повний текст джерелаIt was performed in this study a survey on the quality of commercial sugar cane spirits. The problems that the cachaça faces, mainly in the international market, are due to its low quality and to the lack of standardization of the drink. Commercial samples of sugar cane spirits were analyzed according to the standards of the identity and quality established by the Brazilian law (physical-chemical and chromatographic analyses). There was a great variation in the concentration of the compounds, except in alcoholic content, indicating that the Brazilian sugar cane spirit presents a great variability in the chemical composition among the brands. Among the 94 analyzed brands, 48% did not answer at least one of the standards. Another study performed was the influence of oak wood and the gamma radiation on the sugar cane spirits aging. The aging or maturation process of the drink improves the sensorial characteristics of the product, making it a qualified drink with a higher economical value. The traditional maturation method of the drinks is their interaction with the wood, but the irradiation can accelerate this aging process up. The sugar cane spirit and the oak barrels with 20 liters capacity were subjected to gamma irradiation treatments (150 Gy). Physical-chemical and chromatographic analyses were performed constantly for 390 days during the drink aging period. The sugar cane spirit and barrel irradiation didn't change most of volatile components of the same type coefficient such as volatile acidity, esters, superior alcohols and furfural during the 390 days. There are evidences, however, that some components parameters like aldehydes, tannin, color and copper concentration are in some way influenced, resulting in partial acceleration of the aging or maturing process. At the end of the aging period, a sensorial analysis was made using 30 non-trained people who tasted the drink. The aging process acceleration was confirmed by the sensorial evaluation, where the sugar cane spirit and/or barrel irradiated received higher approval indication in respect of all parameters analyzed (scent, flavor, and appearance).
Hernandes, Nilber Kenup. "Aplica??o de Baixas Doses de Radia??o Gama para Extens?o da Vida ?til de Beterraba Vermelha (Beta vulgaris ssp. vulgaris L.), cv. Early Wonder, Minimamente Processada." Universidade Federal Rural do Rio de Janeiro, 2006. https://tede.ufrrj.br/jspui/handle/tede/542.
Повний текст джерелаThis study was aimed at investigating the effects of low-dose gamma irradiation on shelf-life extension and phytosanitary safety of minimally processed red beet with basis on physicochemical; microbiological; chemical and sensory analyses. The samples (Beta vulgaris ssp. vulgaris L.), Early Wonder cultivar, were cultivated in the experimental area of the Horticulture Sector of the Departamento de Fitotecnia of the Instituto de Agronomia, Universidade Federal Rural do Rio de Janeiro, Serop?dica, RJ, as part of two experiments performed during the second semester of 2005. In each experiment, 1200 plants (40 per linear meter of terrain) were sowed. Physicochemical analyses (fresh mass; length; average diameter and total soluble solids) of the edible part of the red beets (their tuberous roots) were periodically carried out in order to assess the most appropriate time for harvest by monitoring the development of the plants. Those times were found to be 104 and 73 days after transplanting, respectively. The harvested edible part of the roots were minimally processed and separated in two groups: (1) gamma irradiated (with doses of 0.5; 1.0 and 1.5 kGy) and (2) non-irradiated (control). All samples were stored at 8 ?C. Microbiological analyses were performed during the storage period (22 and 21 days, for experiments 1 and 2, respectively) in order to evaluate the phytosanitary quality of the samples (Salmonella sp.; coliforms and total count of mesophilic aerobic and lactic acid bacteria). The samples irradiated with 1.0 and 1.5 kGy were found to remain appropriate for consumption for 21 days, as compared to only 7 days for the control. Monitoring of chemical composition was also performed and included the determination of saccharose; glucose; fructose and vitamins B1 and B2. No difference was found between the concentrations of those vitamins in irradiated and control samples at the end of the storage period, whereas significant changes in sugar contents were detected independently of the dose. In addition, physicochemical analyses investigated the evolution of pH; total acidity; total soluble solids and ascorbic acid throughout storage. Samples from experiment 2 were also subjected to sensory analyses for overall appearance and aroma at 4 different post-irradiation times. The results indicated that the samples irradiated with 1.0 and 1.5 kGy remained good for consumption for 20 days. Therefore it can be concluded that the application of those doses extended the shelf life of the samples without harming their nutritional and sensory quality. Finally, the results indicate that the dose of 1.0 kGy is the most appropriate for the conservation of red beet among those tested.
O objetivo deste estudo foi avaliar, por meio de an?lises microbiol?gicas; qu?micas; f?sicoqu?micas e sensoriais, os efeitos de baixas doses de radia??o gama na extens?o da vida ?til e na garantia da seguran?a microbiol?gica da beterraba vermelha (Beta vulgaris ssp. vulgaris L.), cultivar Early Wonder minimamente processada. Dois experimentos foram realizados, em condi??es de campo, em ?rea experimental do Setor de Horticultura do Departamento de Fitotecnia do Instituto de Agronomia da UFRRJ, Serop?dica, RJ, no segundo semestre de 2005. Em cada experimento, foram transplantadas 1200 mudas (40 por metro linear de canteiro). Foram realizados ensaios f?sico-qu?micos (massa fresca; comprimento; di?metro m?dio e teor de s?lidos sol?veis totais) da parte comest?vel (por??o tuberosa) da beterraba, para avalia??o do est?gio de desenvolvimento das plantas, visando ? determina??o do ponto ideal de colheita. As beterrabas dos experimentos 1 e 2 foram colhidas 104 e 73 dias ap?s o seu transplante, respectivamente. As partes tuberosas foram minimamente processadas e separadas em 2 grupos de amostras: controle (n?o irradiadas) e irradiadas (0,5; 1,0 e 1,5 kGy), sendo que todas foram armazenadas a 8 ?C. Avalia??es realizadas ao longo do per?odo de armazenamento (22 e 21 dias, nos experimentos 1 e 2, respectivamente) permitiram monitorar a: qualidade microbiol?gica (Salmonella sp.; coliformes; contagem total de bact?rias aer?bias mes?filas e contagem de bact?rias l?ticas); a composi??o qu?mica (determina??o dos teores de: sacarose; glicose e frutose e vitaminas B1 e B2) e as propriedades f?sico-qu?micas (pH; acidez total titul?vel; teor de s?lidos sol?veis totais e teor de ?cido asc?rbico). As amostras do experimento 2 foram tamb?m submetidas a an?lises sensoriais (apar?ncia e aroma) em quatro ocasi?es ap?s a irradia??o. Os resultados das an?lises microbiol?gicas indicaram que somente as amostras irradiadas com 1,0 e 1,5 kGy mantiveram-se pr?prias para o consumo por 21 dias, enquanto que as n?o irradiadas apresentaram vida ?til inferior a 7 dias. Ao fim do per?odo de avalia??o, n?o foi observada diferen?a entre os teores das vitaminas B1 e B2 das amostras irradiadas em rela??o ?s de controle. Os teores dos a??cares, por outro lado, sofreram altera??es significativas ao longo do tempo, independentemente das doses aplicadas. Em contraste, n?o foram constatadas altera??es indesej?veis nas propriedades f?sico-qu?micas ocasionadas pela irradia??o. Os resultados das an?lises sensoriais indicaram que as amostras irradiadas com doses de 1,0 e 1,5 kGy mantiveram-se dentro dos padr?es de aceitabilidade por 20 dias. Consistentemente, verificou-se que a aplica??o dessas doses foi eficaz para estender a vida ?til, sem prejudicar a qualidade nutricional ou sensorial das amostras. Finalmente, conclui-se que a dose de 1,0 kGy mostrou-se como a mais apropriada, dentre aquelas estudadas, para a irradia??o de beterraba vermelha minimamente processada.
Johansson, Bengt. "Long-term outcome research on PDR brachytherapy with focus on breast, base of tongue and lip cancer." Doctoral thesis, Örebro : Örebro University, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-10423.
Повний текст джерелаAdrien, Camille. "Développement d’un outil d’optimisation de la dose aux organes en fonction de la qualité image pour l’imagerie scanographique." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112172/document.
Повний текст джерелаDue to the significant rise of computed tomography (CT) exams in the past few years and the increase of the collective dose due to medical exams, dose estimation in CT imaging has become a major public health issue. However dose optimization cannot be considered without taking into account the image quality which has to be good enough for radiologists. In clinical practice, optimization is obtained through empirical index and image quality using measurements performed on specific phantoms like the CATPHAN®. Based on this kind of information, it is thus difficult to correctly optimize protocols regarding organ doses and radiologist criteria. Therefore our goal is to develop a tool allowing the optimization of the patient dose while preserving the image quality needed for diagnosis. The work is divided into two main parts: (i) the development of a Monte Carlo dose simulator based on the PENELOPE code, and (ii) the assessment of an objective image quality criterion. For that purpose, the GE Lightspeed VCT 64 CT tube was modelled with information provided by the manufacturer technical note and by adapting the method proposed by Turner et al (Med. Phys. 36: 2154-2164). The axial and helical movements of the X-ray tube were then implemented into the MC tool. To improve the efficiency of the simulation, two variance reduction techniques were used: a circular and a translational splitting. The splitting algorithms allow a uniform particle distribution along the gantry path to simulate the continuous gantry motion in a discrete way. Validations were performed in homogeneous conditions using a home-made phantom and the well-known CTDI phantoms. Then, dose values were measured in CIRS ATOM anthropomorphic phantom using both optically stimulated luminescence dosimeters for point doses and XR-QA Gafchromic® films for relative dose maps. Comparisons between measured and simulated values enabled us to validate the MC tool used for dosimetric purposes. Finally, organ doses for several acquisition parameters into the ICRP 110 numerical female phantoms were simulated in order to build a dosimetric data base which could be used in clinical practice. In parallel to this work, image quality was first studied using the CATPHAN® 600. From the CTP 404 inserts, the signal-to-noise ratio (SNR) was then computed by using the classical Rose model (J. Opt. Soc. Am. A 16:633-645). An extensive number of images, linked to several acquisitions setups, were analyzed and SNR variations studied. Acquisitions with a SNR closed to the Rose criterion were selected. New acquisitions, based on those selected, were performed with a pre-clinical phantom containing suspect structures in PMMA. These images were presented to two senior radiologists. Both of them reviewed all images and indicated if they were able to locate the structures or not using a 5 confidence levels scale. Two ROC curves were plotted to compare the detection ability if the bead was detectable (SNR > 5) or not. Results revealed a significant difference between the two types of image and thus demonstrated the Rose criterion potential for image quality quantification in CT. Ultimately, organ dose estimations were linked to SNR values through acquisition parameters. Preliminary results proved that an optimization can be performed using the Rose criterion and organ dose estimation, leading to a dose reduction by a factor up to 6
Al, Khawaja Mohamad Safa. "Quel niveau de qualité de traitement peut être obtenu par un système d'irradiation robotisé guidé par l'image en radiothérapie (CyberKnife TM)." Thesis, Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL076N/document.
Повний текст джерелаThe CyberKnifeTM consists of 6MV LINAC mounted on a robotic arm, with six degree of freedom and is coupled to an image guiding system, allowing us to guide the irradiation beams toward the target. The aim is to improve the treatment accuracy and to reduce the irradiation of critical surrounding organs. The treatment is realized by the isotropic convergence of hundreds of orientations for creating up to 1200 mini-beams, which are orientated to the target with submillimetric accuracy. This group is completed by a treatment couch, which is also mounted on a robotized arm, that offers 6 additional degrees of freedom, allowing an additional improvement of accuracy, and eliminates the possible limitations. Using its subsystem SynchronyTM, the CyberKnifeTM is capable of treating the abdo -thoracic tumors, which move with respiration, by moving dynamically the LINAC to compensate the respiratory motion of the tumors. The high dose level, which is used in this kind of hypofractionated treatment, makes the smallest error unacceptable, and needs a very high geometric accuracy with keeping a maximal dosimetric accuracy. Our work is dedicated to evaluate the quality of treatment, in the terms of dosimetric and geometric accuracies. For the different modes of tracking, which are available in the system in static mode, and dynamic mode with respiratory motion tracking. By using different kinds of detectors (ionization chambers, radiochromic films) and three different platforms, which allow simulating simple respiratory motion, real respiratory motion coming from real treated patients, and finally complex motion with hysteresis
ARICHE, COHEN MICHELE. "Validation et utilisation d'un systeme de criteres de qualite d'image pour l'examen du rachis lombaire." Amiens, 1994. http://www.theses.fr/1994AMIEM048.
Повний текст джерелаLama, Lucas Sacchini Del. "Caracterização e adaptação do dosímetro Fricke para dosimetria em irradiação de sangue." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/59/59135/tde-11112013-115906/.
Повний текст джерелаThe Transfusion Associated Graft Versus Host Disease (TA-GVHD) is a rare transfusion reaction, however fatal, which develops due to the presence of donor T lymphocytes in the donated blood and that can be avoided by the irradiation of the donated blood blood and blood components prior to transfusion. Thus, the associated quality control of blood irradiation is necessary to guarantee the quality of the transfused product. In this work it is proposed the characterization and adaptation of the response of a Fricke dosimeter to be used for dosimetry of blood irradiation, more especiafically the Fricke Xylenol Gel (FXG). This is a radiochromic chemical dosimeter, which presents advantages to be tissue equivalent and allows the spatial absorbed dose inference. In this manner, in a way to possibilitate the absorbed dose inference in the full interval used for the prevention of the TA-GVHD (25 to 50 Gy) the FXG was characterized and adapted for dosimetry applications involving blood and blood components irradiation. The results with the new dosimeter showed adequability for the necessary absorbed doses, with satisfactory sensibility and time fading for routine applications. Furthermore, according to the methodology proposed in this work, it was possible to determine the spatial absorbed dose distributions with the new dosimeter in an fast and simple way, showing that this dosimeter presents convenient characteristics for dosimetry quality control of irradiated the blood and blood components.
Cardozo, Nelson X. "Desenvolvimento de um sistema de irradiação para produção de radioisótopos gasosos aplicados em processos industriais." reponame:Repositório Institucional do IPEN, 2016. http://repositorio.ipen.br:8080/xmlui/handle/123456789/27408.
Повний текст джерелаMade available in DSpace on 2017-05-02T11:34:44Z (GMT). No. of bitstreams: 0
Dentre as diversas aplicações dos radioisótopos, a utilização dos radiotraçadores é considerada uma das mais importantes, no diagnóstico de funcionamento dos equipamentos de processos, em plantas de indústrias químicas e petroquímicas. Os radiotraçadores são utilizados em procedimentos analíticos para obtenção de dados qualitativos e quantitativos de sistemas, em estudos de transferências físicas e físico-químicas. Na produção de radioisótopos gasosos utilizados como traçadores em processos industriais, destacam-se o 41Ar e 79Kr, gases nobres (inertes) que possuem baixa reatividade com os demais elementos químicos. O 41Ar é um emissor gama de alta energia (1,29 MeV) e apresenta elevada porcentagem de transformações com essa energia, o que resulta em quantidades relativamente pequenas necessárias em relação a outras para uma detecção eficaz, mesmo em componentes com grandes espessuras. Atualmente, a produção de radioisótopos gasosos em reatores nucleares de pesquisa é realizada em pequenas quantidades (bateladas), por meio de ampolas de quartzo contendo o gás natural 40Ar ou 78Kr. Nesse sentido, o objetivo desse estudo é desenvolver um sistema de irradiação capaz de produzir em escala contínua, o radioisótopo gasoso 41Ar, dentre outros, com atividade de 7,4x1011 Bq (20 Ci) por ciclo de irradiação, por meio do Reator IEA-R1 de 4,5 MW, fluxo de nêutrons térmicos médio de 4,71 x 1013 ncm-2s-1, para suprir uma demanda existente em empresas de END e inspeções, e pelo próprio Centro de Tecnologia das Radiações, no IPEN/CNEN-SP. O sistema de irradiação (SI) é constituído por uma cápsula de irradiação em alumínio, linhas de transferência, válvulas agulhas, conexões anilhadas, conectores rápidos, manovacuômetro, sistema de vácuo, dewar de liquefação, blindagem em chumbo, cilindros de armazenamento e transporte (CAT), dentre outros. O SI foi aprovado nos testes de estanqueidade e estabilidade (testes de formação de bolhas, pressurização, evacuação e com equipamento leak detector SPECTRON 600 T). Na produção experimental para obtenção de 1,07x1011 Bq (2,9 Ci) de 41Ar, distribuíram-se dosímetros de alanina em diversos componentes e dispositivos do SI. Além disso, determinaram-se as taxas de exposição na parede da blindagem em chumbo, ao concentrar o gás radioativo liquefeito e no CAT, após a transferência do 41Ar, pelo medidor de radiação portátil Teletector ® Probe 6150 AD-t/H.
Dissertação (Mestrado em Tecnologia Nuclear)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Viala, Diego. "Étude de la physique de l'allumage par choc." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0127.
Повний текст джерелаA decade of experiments at the National Ignition Facility has proven that inertial confinement fusion is a credible approach to energy production, with experiments having exceeded the ignition regime. However, the indirect-drive approach is not suited for high gain implosions and reliable energy production. The direct-drive ignition approach is favoured for energy production as it features simpler target designs and couples more energy to them. There are currently no ignition-scale laser facilities configured for the standard direct-drive approach. Integrated direct-drive experiments have mostly been focused on understanding the physics at reduced scales, with the ultimate goal of demonstration of necessity and feasibility of construction of an international direct-drive laser facility.This thesis manuscript presents a study on the validation of state-of-the-art 3D radiative hydrodynamics codes and the understanding of low modes and laser coupling which play crucial roles in the study of inertial fusion energy. Careful examination of CBET models is of paramount importance in this context, ensuring the accuracy of simulations and contributing to the design of future direct-drive facilities. In addition, the investigation of laser homogeneity on target is imperative to understand its overall impact on the system
Blazy, Léone. "Contrôle qualité des systèmes de planification dosimétrique des traitements en radiothérapie externe au moyen du code Monte-Carlo Penelope." Toulouse 3, 2007. http://thesesups.ups-tlse.fr/11/.
Повний текст джерелаTreatment Planning Systems (TPS) have a main position in a radiotherapy department: they perform calculation of dose distributions and calculate treatment time for each beam. Usually, quality control of dose distributions given by TPS is based on comparisons with measured ones. This study aims at replacing measured dose distributions by reference calculated dose distributions obtained with the PENELOPE Monte-Carlo (MC) code. Monte-Carlo simulations provide several configurations and allow a quality control of TPS dosimetric features without need for the treatment units availability. This quality control, based on MC simulations, was tested for a clinical TPS and allowed to simplify the quality process of the TPS. This control more detailed, more accurate and easily to implement could be applied for all radiotherapy departments
Kocian, Sonntag Anne. "Evaluation de la qualité des images produites par des photons de haute énergie. Apport de la numérisation et application au contrôle des irradiations thérapeutiques." Toulouse 3, 1991. http://www.theses.fr/1991TOU30265.
Повний текст джерелаMazet, Jean-François. "Couleur et qualité des placages de chêne et étude de leur comportement photochimique." Nancy 1, 1988. http://www.theses.fr/1988NAN10393.
Повний текст джерелаBerbis, Julie. "Quelle utilité à la mise en œuvre du suivi des enfants et adolescents survivant à une leucémie dans la prise de décision ? : A propos de la cohorte LEA." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM5086.
Повний текст джерелаRegular advances in cancer treatment have dramatically improved the prognosis of children with acute leukemia, raising with a great acuity the problem of the late physical side effects, social integration, quality of life of the patients and their family as well as identification of the determinants of these outcomes. It is the responsibility of all the care system actors to consider these objective and subjective late effects. The LEA project (Leucémie de l'Enfant et de l'Adolescent - childhood and adolescent leukemia) was initiated in 2004 with the aim of studying the long-term health status and quality of life of children treated for leukemia after January 1980. As soon as the project began, the aim was to implement a system that can produce knowledge in a traditional research approach, but also to rapidly become a pragmatic approach of producing information that could affect both care and monitoring practices. The general objective of this manuscript seeks to demonstrate the utility of heavy plan such as the implementation of a cohort, in the double approach of providing information on the one hand directly relevant to clinical decision, and on the other hand likely to enlighten public decision. The present scientific works are based on: 1. The visibility of LEA in relation to other cohorts of childhood cancer survivors existing internationally; 2. The long-term impact of the heavy modalities of treatment, as the hematopoietic stem cell transplantation or irradiation; 3. The quality of life of the family long after the completion of cancer therapy; 4. The usefulness of a systematic follow-up in reducing inequalities in access to health care among social classes
Karagoz, Isin 1983. "Safety Assurance of Pecans by Irradiation without a Detrimental Effect on Quality." Thesis, 2012. http://hdl.handle.net/1969.1/148092.
Повний текст джерелаKeithley, Sarah Elizabeth. "The effect of treatment on the quality of harvested rainwater." Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-05-5825.
Повний текст джерелаtext
Arnold, John. "Evaluating Quality and Palatability Characteristics of Beef Subprimals Treated with Low-dose Irradiation." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10574.
Повний текст джерелаchen, Pei-Ru, and 陳佩汝. "Effect of Ultraviolet Irradiation on the Quality of Common Mushrooms and Other Edible Mushrooms." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/60483795563503158306.
Повний текст джерела國立中興大學
食品科學系
85
Common mushrooms (Agaricus bisporus) are of good taste, unique flavor and abundant nutrients. But the quality of mushrooms declines rapidly due to the microbial contamination and the damage during picking, packaging or transportion. Therefore, to avoid browning and extend the shelf life of mushrooms are important. Recently, the techniques of food irradiation are advancing quickly and gradually accepted by people. Ultraviolet irradiation is one kind of food irradiation, too. It can inhibit microbial growth and delay the ripening of vegetables and fruits. It also has the function of promoting the activation of vitamin D. Therefore, ultraviolet irradiation should be of positive effect on the preservation of mushrooms and increasing the nutrient value. Therefore, this research was undertaken to study the effect of different doses of ultraviolet C or B (UVC or UVB) irradiation on the volatile compounds of fresh mushrooms and the total plate counts, the lightness, Δ E value and the diameter of the cap, the length of the stipe and the weight loss of common mushrooms and/ or hot mushrooms (Agaricus bitorquis), during storage at 12 ℃. This study also examined the amounts of vitamin D in A. bisporus, A. bitorquis, Volvariella volvecea and Lentinula edodes after ultraviolet irradiation. During the storage, the total plate counts of A. bisporus and A. bitorquis were reduced 70-78% after UVC irradiation. But after day 6, the reduction was eliminated. The amount of 1-octen-3-ol of mushrooms after irradiation was higher than that of the control. But the higher doses did not increase the effect. UVC irradation was not effective in delaying the ripening of common and hot mushrooms, but it increased the browning of the fruit body with doses increased. UVC irradiation increased the amounts of vitamin D of mushrooms. The stronger the irradiation, the higher were the amounts of vitamin D. After UVC irradiation for 2 hours, the amounts of vitamin D of A. bisporus and A. bitorquis reached 332% and 133% of the control, respectively. UVB increased the amounts of vitamin D of common mushrooms in a dose-depend manner. The effect of UVB irradiation was better than that of UVC. After UVB irradiation for 2 hours, the amounts of vitamin D reached to 567% of that of t he control. UVB was also effective on the straw mushroom and shiitake, but the changes of vitamin D was not as large as on those of the common mushrooms. However, the changes increased with increasing doses. The effect of UVB irradiation on the A. bisporus was not as significant as UVC during storage at 12 ℃, but that the changes of volatile compounds were similar to those of UVC irradiation. However, the total plate counts and phenomena were not significantly affected. The color of the mushrooms was darkened with increasing doses and storage time. The effect of ulraviolet irradiation on the mushrooms was not uniform. The users should select the kind and dose depending on their need for extending the shelf life or increasing the nutrient values.
Adavi, Megha Sarthak. "Electron Beam Irradiation for Improving Safety of Fruits and Vegetables." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9178.
Повний текст джерелаPoon, Patty Wai Bing. "Effect of electron-beam irradiation and vitamin E fortified diet on ground beef quality preservation." Thesis, 2001. http://hdl.handle.net/2429/12730.
Повний текст джерелаYang, Ming-Sheng, and 楊明聖. "Effects of gamma irradiation on the quality of shiitake ( Lentinula edodes Sing) and day lily (Hemerocallis fulva L.)." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/63326512091542764485.
Повний текст джерела國立中興大學
園藝學系
83
Fresh shiitake (Lentinula edodes Sing) was irradiated with doses of 0.5, 1.0 and 2.0kGy using 60Co. Effects of gamma irradiation on the appearance and the flavor compounds of shiitake before and after drying were studied.Irradiation with a dose of 0.5kGy reduced mold growth and browning in the fresh shiitake during postharvest storage.The growth of fresh shiitake was absolutely inhibited by doses of 1 or more kGy. The appearance quality of fresh shiitake was not affected With gas chromatography-mass spectrometry after 2kGy irradiation. the volatile components, especially as esters, alcohol and eight- carbon compounds were increased in the fresh shiitake. After being dried the shiitake with 1kGy irradiation contained higher. However, 0.5kGy irradiation was recommended to use in fresh shiitake for inhibiting mold growth, browning and cap- openning and keeping a good appearance and flavor quality during post- harvesting storage. Fresh day lily (Hemerocallis fulva L.) flowers were irradiated with doses of 0.5, 1.0, 2.0, 5.0kGy using 60Co. Effects of gamma irradiated on the appearance and flavor quality were studied with scanning electron microscopy (SEM) and gas- chromatography The flower blooming was inhibited by 2.0 or more kGy irradiation. However, the browning and the tissue breaking were found in the flowers irradiated with 2.0 and 5.0kGy the dropping of flowers occurred after 5.0kGy and irradiation. With 1.0kGy irradiation The volatile components of dried lily flowers were ethyl formate, ethyl acetate, 3-methyl butanol, ethanol, isoamyl alcohol, methyl pyrazine, 2,6-dimethyl pyrazine,furfural , acetic acid, terpinolene, furfuryl formate ,furfuryl acetate, benzene acetaldehy The irradiation was recommended to use to inhibit mold and insects in dried day lily flowers during storage.
Chen, I.-Chi, and 陳翊綺. "Influences of washing with sodium hypochlorite sanitizer, UV irradiation, and storage temperature on shell egg quality during storage." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/gk426k.
Повний текст джерела國立中興大學
動物科學系所
106
Shell eggs are occasionally contaminated by feces, thus leading to the exhibiting of some microorganisms on the surfaces of shell eggs. Some pathogens may enter into eggs from shells. Consumption of those contained eggs, particularly the eggs without washing and raw ones might exhibit a health hazard to consumers. Shell egg cleaning process commonly include physical brushing, sanitizing, and rinsing with running water. Previous studies indicated that sodium hypochlorite (NaOCl) and ultraviolet (UV) irradiation significantly inhibited and sanitized the growth of microorganisms. The objective of the 1st part of the study was to compare the influences of washing, sanitizing with NaOCl and UV irradiation on the quality of eggs stored at different temperatures for 4 weeks; the objective of the 2nd part of the study was to compare the influences of different concentrations of NaOCl and UV irradiation on the quality of eggs stored at refrigerated temperatures. For the 1st part, the results show that the values of water temperatures and free available residual chlorine contents collected from the outlets of washing machines close to the setting ones and conformed to the regulation of Certified Agriculture Standards. The total plate counts detected on the shells of unwashed (U) were significantly higher than those of the ones washed and sanitized with NaOCl (N), as well as the ones washed and sanitized with NaOCl and UV irradiated (NUV), which had the lowest microbial counts. The total plate counts of the inner contents for all groups were less than 25 CFU/mL of egg content. Scanning electron microscope results show that cuticle covering diminished with storage time, while superior cuticle coatings were observed on the ones without washing then stored at 7oC (UC) and 25oC (UR), thus leading to less increases in air cells. The similar change pattern of hydroxyl group intensity detected on the eggshell was also observed, while no significant difference was observed for the eggshell thickness and strength (P > 0.05). After 4-week storage, the performance of Haugh units, pH values and moisture content of albumin, thick albumin ratio, and yolk index of samples stored at 7oC (UC, NC, and NUVC) were superior significantly (P < 0.05) than those stored at 25oC (UR, NR, and NUVR), while no significant difference was observed on the yolk moisture contents of samples (P > 0.05). For the 2nd part, the results show that the values of water temperatures and free available residual chlorine contents collected from the outlets of washing machines close to the setting ones. The total plate counts detected on the shells of unwashed (U) were significantly higher than those of the other treatments, while ones washed and sanitized with NaOCl and irradiated with UV decreased the microbial loads. No significant difference was observed for the eggshell thickness and strength (P > 0.05). The size of air cell increased significantly with storage time, while less increase was observed for the ones without washing. UV irradiation increased the b* values of eggshell (P < 0.05), but for L* values and a* values no significant differences were observed between treatments. After 4-week storage, the Haugh units of samples remained at USDA AA grade, while the yolk index decreased slightly. The pH values of albumin and yolk increased significantly with storage time and no significant differences were observed between treatments. The albumin moisture contents increased with storage time with significant differences between treatments. For the functionality, albumin foaming ability, albumin foaming stability and yolk emulsion capacity were not significantly different between treatments due to the concentrations of NaOCl and UV irradiation (P > 0.05). In conclusion, it is suggested that shell eggs should be washed and sanitized with 50 ppm NaOCl, irradiated by UV, and then storage at refrigerated temperatures in order to maintain the quality as well as the consumption safety.
Kundu, Devapriya. "Effect of low-dose x-ray and e-beam irradiation on Escherichia coli O157:H7, non-O157 (VTEC) Escherichia coli and Salmonella viability on meat surfaces and sensory quality of meat." 2013. http://hdl.handle.net/1993/15794.
Повний текст джерелаLin, Yu-Chuan, and 林育全. "Effects of Irradiation on Stored Quality of Garlic and Studies on the Extraction Technology and Preservation Method of Allicin." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/35908840450981911510.
Повний текст джерела國立中興大學
食品科學系
85
ABSTRACT Garlic is used widely, and all round the year, but its production periods are only in April and May of the year. By using traditional method of air-drying, garlic just stored up to September. At that time, the contents of flavor components would be decreased when garlic is sprouting, and garlic would become dried, spoiled or insect-damaged. The intact garlic doesn''t have special flavor before crushing. The main flavor appears when the cell in plant is destroyed, and is formed from some non-volatile flavor precursors by enzyme. The main substance of these precursors is alliin, and the main flavor component thus obtain is allicin. The objectives of the research wre to (A) study the influence of the flavor and quality of garlic by gamma irradiation in order to extend garlic storage life; (B) study the condition by using supercritical carbon dioxide as solvent to proceed systhesis of allcin, and the practicable of preserving allicin by using absorbants, and (C) study the extraction of allicin and alliin from garlic by using microwave-assisted extraction. The results are shown as: (A) At day 30 after, garlic treated with 0.5 kGy, 1 kGy, 5 kGy, 10 kGy of gamma-ray. 5 kGy and 10 kGy treated garlic have been spoiled and become inedible, but 0.5 kGy and 1 kGy treated garlic retained the similar quality as compared to the control one. At day 90 after, 0.5 kGy treated garlic had better quality than control one. (B) By using supercritical carbon dioxide as solvent, the synthesis of alliin as substract and crude alliinase prepared from garlic was to proceeded the synthesis of allicin. Under the condition of 3,000 psi, 35℃ and adding 0.3 % H2O to assist enzyme reaction, results showed that 30-min reaction could obtain the recovery of over 24.83 %, and decrease the production of by-product of enzyme reaction. (C) By using microwave-assisted extraction to study the practicable of extracting allicin and alliin in short time. Garlic bulbs extracted with microwave power of 40 for 1 min obtained the best allicin extraction ratio (0.67 mg/g fresh garlic), with microwave power of 40 for 5 min obtained the best alliin extraction ratio (0.312 mg/g of fresh garlic)。 Sliced garlic extracted with microwave power of 30 for 1 min obtained the best allicin extraction ratio (9.11 mg/g of fresh garlic), and with microwave power of 50 for 3 min obtained the best alliin extraction ratio (2.7 mg/g of fresh garlic). Keywords: garlic, gamma-ray, allicin, alliin, supercritical fluid extraction, microwave-assisted extraction (MAE)
Wong, Peter Yan Yung. "The effects of electron beam irradiation and infusion of L-ascorbic acid on the preservation of quality of fresh ground beef patties." Thesis, 2001. http://hdl.handle.net/2429/11469.
Повний текст джерелаNeal, Jack A. "THE EFFECTS OF ELECTRON BEAM IRRADIATION AND SANITIZERS IN THE REDUCTION OF PATHOGENS AND ATTACHMENT PREVENTION ON SPINACH." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-289.
Повний текст джерелаTsai, Wen-Che, and 蔡汶哲. "Investigation of the Microbial Quality and Residues of Chemical Reagents in Fresh-Cut Vegetables in Taiwan, and the Application of Gamma Irradiation on the Extension of Their Shelf-life." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/f8qts5.
Повний текст джерела國立中興大學
食品暨應用生物科技學系所
99
Fresh-cut fruits and vegetables are easy to have browning reactions and microbial contamination during the processing. Therefore, manufactories may add antioxidants or antibacterial agents to avoid the quality reduction of these products. Thus, the first part of this study was to investigate the microbial quality and the amounts of chemical residuals in fresh-cut vegetables. In the second part of this study, vegetables which are easily contaminated by microorganisms were irradiated to inhibit the growth of microorganisms and to increase its shelf life. Moreover, the effects of irradiation on the physical and sensory quality of vegetables were also investigated. In the first part, a total of 42 ready-to-eat (RTE) vegetables (classified into leafy vegetable and rhizomes), 15 ready-to-cook (RTC) vegetables, and 24 sprout products were investigated. The total plate counts above 105 CFU/g, coliform counts above 103 MPN/g, and Escherichia coli counts above 10 MPN/g were unacceptable. In addition, Staphylococcus aureus and Salmonella spp. can’t be detected. Among 42 RTE samples, 13 and 12 samples were unacceptable due to the too high amounts of total plate count and coliform count, individually; while, E. coli, S. aureus, and Salmonella spp. were not detectable in all RTE samples. For 15 RTC samples, 10 samples had total plate count higher than 105 CFU/g, and 9 samples had coliform count higher than 103 MPN/g. Since RTC products will be cooked before eating, it is sure that microorganisms normally can be eliminated before ingestion with proper cooking process. There was no contamination of S. aureus and Salmonella spp. in all RTC samples. All 24 sprout products were unacceptable in total plate count and coliform count. Moreover, two samples were contaminated by E. coli, but S. aureus and Salmonella spp. were not detectable in all sprout samples. Additionally, in all RTE, RTC, and sprout samples, no residual chloride and sulfur dioxide was detected, and the content of ascorbic acid and citric acid were all under the legal limits. In the second stage of this study, food irradiation was applied to six common vegetables (lettuce, cabbage, alfalfa sprouts, pea shoot, carrot, and potato). The results showed that gamma irradiation could effectively reduce the growth of microorganism. After the storage for 9 days, the log reduction for total plate counts could reach to 6 log CFU/g, 4 log CFU/g, and 4-6 log CFU/g for 3-kGy irradiated leafy vegetables, rhizome, and sprouts, respectively. Moreover, the log reduction of yeast and mold on leafy vegetables, rhizome, and sprouts were about 6 log CFU/g, 6 log CFU/g, and 4-6 log CFU/g, respectively. The damage level of food irradiation on tissues of vegetables was expressed by the electrolyte leakage value (EL). The EL values at 3 kGy dose were higher than other dosages for all test samples, and the EL also increased with the increase of storage time. Therefore, the tissues of vegetables were affected by both irradiation dose and storage time. After samples were stored for 9 days, the color of irradiated samples had no significant difference compared with non-irradiated samples. The irradiated cabbage and carrot were used to perform the sensory evaluation, for understanding the effects of irradiation on customer’s preference. Due to other vegetables released water or had bad appearance after storage, they were not suitable for sensory evaluation. The appearance score of cabbage treated with 0.5 kGy dose slightly decreased (0.56%); however, odor score (7.22%), texture score (5.00%), and overall acceptability score (5.56%) were increase, as compared to un-irradiated cabbages. At high irradiation dose of 2 kGy, the score of four sensory items decreased, since most people didn’t accept this level of irradiated cabbage. Moreover, the score of carrot treated with 0.5 kGy dose were decreased in appearance (3.33%), odor (2.22%), texture (5.00%), and overall acceptability (0.56%). At irradiation dose of 1 kGy, the score of four sensory items increased compared with carrot treated with 0.5 kGy dose. Carrot irradiated with 2 kGy dose had lower score in overall acceptability than that treated with 1 kGy. Therefore, irradiation dose at 0.5 kGy could improve the sensory and hygiene quality of cabbage, and irradiation dose at 1 kGy had better sensory effect on carrot.
MATĚJKOVÁ, Kateřina. "Tvorba biogenních aminů v mase vybraných druhů ryb." Doctoral thesis, 2013. http://www.nusl.cz/ntk/nusl-170424.
Повний текст джерелаJohnstone, Christopher Daniel. "Microcomputed tomography dosimetry and image quality in preclinical image-guided radiation therapy." Thesis, 2019. http://hdl.handle.net/1828/10789.
Повний текст джерелаGraduate