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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Avaliação da produção e dos efeitos das radiações gama em macarrão enriquecido com bagaço de linhaça (Linum usitatissimum L.) / Evaluation of production and the effects of gamma radiation on enriched macaroni with flaxseed bagasse (Linum usitatissimum L.)

Márcia Lage de Oliveira 14 March 2014 (has links)
O Brasil é o terceiro maior produtor de massas, com um volume de negócios anual de mais de um milhão de toneladas. Macarrão é uma fonte de energia, baixo custo, fácil de fazer, pode ser consumido em todas as estações, agrada a todos, apresenta variações de forma e cor que torna este produto tão popular. O objetivo do estudo foi o de avaliar a viabilidade de produção de um macarrão enriquecido a partir do bagaço obtido da extração de óleo de linhaça e estudar os efeitos da radiação gama no mesmo. Foram produzidas sete formulações de macarrão, sendo que duas foram irradiadas com 20kGy (20 e 40% de adição de farinha de bagaço de linhaça), duas foram produzidas com farinha do bagaço de linhaça irradiada a 10kGy nas proporções de 20 e 40%, duas não receberam nenhuma dose (nas proporções de 20 e 40%) e uma formulação de controle. As irradiações foram realizadas no irradiador multipropósito de Co60 do Instituto de Pesquisas Energéticas e Nucleares - IPEN/SP. As seguintes análises foram realizadas: determinação da umidade, acidez, pH, extrato etéreo, cinzas, proteína, fibra, textura, aderência e testes de cozimento, no Laboratório de Radiobiologia e Ambiente Centro de Energia Nuclear na Agricultura CENA/USP e na ESALQ em Piracicaba e as análises microbiológicas foram realizadas no Laboratório de Fungos Toxigênicos e Micotoxinas da USP/SP. Os valores da umidade e da acidez obtidos para os diferentes tipos de macarrão mostraram alta eficiência na secagem. As formulações M80:20, M80:20FT e M60:40 apresentaram também uma alta qualidade em relação ao aumento de massa e perda de sólidos solúveis segundo os parâmetros de Hummel. Houve também um aumento na quantidade de fibras ficando valor calórico reduzido. / Brazil is the third largest producer of pasta, with an annual turnover of more than one million tons. Pasta is a power source, low cost, convenient to make, can be eaten in all seasons, appeals to everyone, presents variations of shape and color which makes this product so popular. The aim of the study was to evaluate the feasibility of producing an enriched pasta using bagasse obtained from flaxseed oil extraction and study the effects of gamma radiation on the same. Seven preparations of noodles were produced, two of which were irradiated with 20kGy (20 and 40% of crushed flaxseed meal), two were produced with flour from crushed flaxseed irradiated to 10 kGy at the proportions of 20 and 40%, two did not receive a dose (proportions of 20 and 40%) and a control formulation. The irradiations were performed in the multipurpose irradiator of the Institute of Energy and Nuclear Research IPEN. The following analyzes were performed: determination of moisture, acidity, pH, ether extract, ash, protein, fiber, texture and cooking test, at the Laboratory of Radiobiology and Environmental Center for Nuclear Energy in Agriculture - CENA / USP. The values of moisture and acidity obtained for the different types of noodles showed high efficiency in drying. The formulations M80:20, M80:20FT e M60:40 also showed high quality in relation to the increase in the amount in mass and loss of soluble solids according to Hummel parameters. There was also an increase in the amount of fibers being reduced caloric values.
2

Avaliação da produção e dos efeitos das radiações gama em macarrão enriquecido com bagaço de linhaça (Linum usitatissimum L.) / Evaluation of production and the effects of gamma radiation on enriched macaroni with flaxseed bagasse (Linum usitatissimum L.)

Oliveira, Márcia Lage de 14 March 2014 (has links)
O Brasil é o terceiro maior produtor de massas, com um volume de negócios anual de mais de um milhão de toneladas. Macarrão é uma fonte de energia, baixo custo, fácil de fazer, pode ser consumido em todas as estações, agrada a todos, apresenta variações de forma e cor que torna este produto tão popular. O objetivo do estudo foi o de avaliar a viabilidade de produção de um macarrão enriquecido a partir do bagaço obtido da extração de óleo de linhaça e estudar os efeitos da radiação gama no mesmo. Foram produzidas sete formulações de macarrão, sendo que duas foram irradiadas com 20kGy (20 e 40% de adição de farinha de bagaço de linhaça), duas foram produzidas com farinha do bagaço de linhaça irradiada a 10kGy nas proporções de 20 e 40%, duas não receberam nenhuma dose (nas proporções de 20 e 40%) e uma formulação de controle. As irradiações foram realizadas no irradiador multipropósito de Co60 do Instituto de Pesquisas Energéticas e Nucleares - IPEN/SP. As seguintes análises foram realizadas: determinação da umidade, acidez, pH, extrato etéreo, cinzas, proteína, fibra, textura, aderência e testes de cozimento, no Laboratório de Radiobiologia e Ambiente Centro de Energia Nuclear na Agricultura CENA/USP e na ESALQ em Piracicaba e as análises microbiológicas foram realizadas no Laboratório de Fungos Toxigênicos e Micotoxinas da USP/SP. Os valores da umidade e da acidez obtidos para os diferentes tipos de macarrão mostraram alta eficiência na secagem. As formulações M80:20, M80:20FT e M60:40 apresentaram também uma alta qualidade em relação ao aumento de massa e perda de sólidos solúveis segundo os parâmetros de Hummel. Houve também um aumento na quantidade de fibras ficando valor calórico reduzido. / Brazil is the third largest producer of pasta, with an annual turnover of more than one million tons. Pasta is a power source, low cost, convenient to make, can be eaten in all seasons, appeals to everyone, presents variations of shape and color which makes this product so popular. The aim of the study was to evaluate the feasibility of producing an enriched pasta using bagasse obtained from flaxseed oil extraction and study the effects of gamma radiation on the same. Seven preparations of noodles were produced, two of which were irradiated with 20kGy (20 and 40% of crushed flaxseed meal), two were produced with flour from crushed flaxseed irradiated to 10 kGy at the proportions of 20 and 40%, two did not receive a dose (proportions of 20 and 40%) and a control formulation. The irradiations were performed in the multipurpose irradiator of the Institute of Energy and Nuclear Research IPEN. The following analyzes were performed: determination of moisture, acidity, pH, ether extract, ash, protein, fiber, texture and cooking test, at the Laboratory of Radiobiology and Environmental Center for Nuclear Energy in Agriculture - CENA / USP. The values of moisture and acidity obtained for the different types of noodles showed high efficiency in drying. The formulations M80:20, M80:20FT e M60:40 also showed high quality in relation to the increase in the amount in mass and loss of soluble solids according to Hummel parameters. There was also an increase in the amount of fibers being reduced caloric values.
3

Radiation damage effects in charge coupled devices

Robbins, Mark Stanford January 1992 (has links)
The effects of Sr90 beta radiation and Co60 gamma radiation on the operation of EEV buried channel charge coupled devices (CCDs) have been studied. This work was instigated by the need to qualify CCDs for the SLD vertex detector. However, the work is also relevant to other small signal, low noise applications. The results of the batch qualification are presented and the data base of ionising radiation effects on EEV CCDs has been extended to include the effects of irradiation whilst clocking at 180K. Particular attention has been aimed at investigating the charge transfer degradation due to low levels of bulk defects. The measured energy level, capture cross section and introduction rate of the main radiation induced defect agrees well with published results for the Si-E centre. Annealing studies are also presented. A model for the charge transfer degradation is proposed. This includes the effects of temperature, readout rate, signal density and irradiation type and energy. Observations are also presented on the effect of irradiation on the noise characteristics of the single stage output circuit. For low noise applications the output is run in buried channel mode. In this mode the increase in noise is dominated by the change in the operating point of the output MOSFET.
4

Hyper-production of raw-starch-digesting enzyme by mutant fungal strain and optimisation of solid by-products / Sản xuất cao sản enzyme phân hủy tinh bột sống bởi chủng đột biến và môi trường tối ưu

Vu, Van Hanh, Keun, Kim 15 July 2013 (has links) (PDF)
Selected fungal strain for production of raw-starch-digesting enzyme by solid state fermentation was improved by sequential exposures to γ-irradiation of Co60, ultraviolet and treatments with Nmethyl-N'-nitrosoguanidine. Mutant Aspergillus sp. CXN2-3A was chosen and its production of raw-starch-digesting enzyme (RSDE) was improved 2 folds higher than that of wild type. Optimal condition for the production of the enzyme using wheat bran as the substrate was accomplished for the CXN2-3A. With the optimal fermentation condition and the solid medium supplemented with urea and NH4NO3, CoSO4, Tween 80, 1% glucose, CXN2-3A produced RSDE 19.23 folds higher than wild type cultured in pre-optimized condition and un-supplemented medium. / Chủng nấm chọn lọc sản xuất enzyme thủy phân tinh bột bằng cách lên men trạng thái rắn, chủng nấm được cải thiện bằng chiếu xạ tia cực tím, tia Co60 và các phương pháp xử lí với N-methyl-N'-nitrosoguanidine. Mutant Aspergillus sp. CXN2-3A, đã được lựa chọn để sản xuất enzyme (RSDE) thủy phân tinh bột sống cải thiện cao hơn 2 lần so với chủng dại. Điều kiện tối ưu cho việc sản xuất các enzyme bằng cách sử dụng cám, lúa mì đã được thực hiện cho CXN2-3A. Với điều kiện lên men xốp tối ưu và bổ sung urê và NH4NO3, CoSO4, Tween 80, 1% glucose, CXN2-3A đã sản xuất RSDE cao gấp 19,23 lần so với kiểu dại ở cùng điều kiện.
5

Hyper-production of raw-starch-digesting enzyme by mutant fungal strain and optimisation of solid by-products: Research article

Vu, Van Hanh, Keun, Kim 15 July 2013 (has links)
Selected fungal strain for production of raw-starch-digesting enzyme by solid state fermentation was improved by sequential exposures to γ-irradiation of Co60, ultraviolet and treatments with Nmethyl-N'-nitrosoguanidine. Mutant Aspergillus sp. CXN2-3A was chosen and its production of raw-starch-digesting enzyme (RSDE) was improved 2 folds higher than that of wild type. Optimal condition for the production of the enzyme using wheat bran as the substrate was accomplished for the CXN2-3A. With the optimal fermentation condition and the solid medium supplemented with urea and NH4NO3, CoSO4, Tween 80, 1% glucose, CXN2-3A produced RSDE 19.23 folds higher than wild type cultured in pre-optimized condition and un-supplemented medium. / Chủng nấm chọn lọc sản xuất enzyme thủy phân tinh bột bằng cách lên men trạng thái rắn, chủng nấm được cải thiện bằng chiếu xạ tia cực tím, tia Co60 và các phương pháp xử lí với N-methyl-N'-nitrosoguanidine. Mutant Aspergillus sp. CXN2-3A, đã được lựa chọn để sản xuất enzyme (RSDE) thủy phân tinh bột sống cải thiện cao hơn 2 lần so với chủng dại. Điều kiện tối ưu cho việc sản xuất các enzyme bằng cách sử dụng cám, lúa mì đã được thực hiện cho CXN2-3A. Với điều kiện lên men xốp tối ưu và bổ sung urê và NH4NO3, CoSO4, Tween 80, 1% glucose, CXN2-3A đã sản xuất RSDE cao gấp 19,23 lần so với kiểu dại ở cùng điều kiện.
6

Irradiação gama e armazenamento do mamão 'formosa' minimamente processado

Giannoni, Juliana Audi [UNESP] 20 December 2004 (has links) (PDF)
Made available in DSpace on 2014-06-11T19:32:27Z (GMT). No. of bitstreams: 0 Previous issue date: 2004-12-20Bitstream added on 2014-06-13T21:04:24Z : No. of bitstreams: 1 giannoni_ja_dr_botfca.pdf: 416586 bytes, checksum: 823a84b7d402557839873c28c91f8b12 (MD5) / Esta pesquisa teve por objetivo utilizar diferentes doses de irradiação gama sobre frutos de mamão 'Formosa' (Carica papaya L.) pré-cortados e refrigerados, visando facilitar as etapas do processamento mínimo e o consumo, além de encontrar a dose ideal de irradiação que proporcione total segurança alimentar com relação aos microrganismos, ampliando, desta forma, o período de vida útil dos frutos e mantendo as características de qualidade. Todo o processamento do mamão até a embalagem foi executado na Empresa Verde Limpo, situada em Botucatu/SP. Os frutos já embalados foram irradiados na Companhia Brasileira de Esterilização (CBE), em Jarinú/SP. As doses aplicadas foram 0,0; 0,2; 0,4; 0,6; 0,8 e 1,0kGy. Após a irradiação os frutos minimamente processados foram armazenados à temperatura de 9 l 1ºC e umidade relativa de 90 l 5% durante nove dias. As avaliações foram a cada dois dias, exceto as análises microbiológicas que foram nos 1º, 5º e 9º dias de conservação. As alterações na qualidade pós-colheita foram detectadas por meio das seguintes análises: perda de massa fresca (PMF), aparência, textura, acidez titulável (AT), pH, sólidos solúveis (SS), vitamina C, açúcares totais (A.Totais) e redutores (AR), sacarose (S), pectinas total (PT) e solúvel (PS), enzimas poligalacturonase (PG) e pectina metilesterase (PME), análise sensorial (cor, aroma, textura e sabor), índice de doenças e conservação pós-colheita. Para as análises microbiológicas foram identificadas bactérias aeróbicas (mesófilas e psicrotróficas), fungos (leveduras e bolores) e coliformes (totais e fecais). O delineamento estatístico empregado foi DIC inteiramente casualizado com quatro repetições por tratamento, utilizando o programa SISVAR® e teste de Scott-Knott ao nível de 5% de significância... / The objective of this research was to evaluate the influence of gamma irradiation on 'Formosa' papaya fresh-cut fruits (Carica papaya L.), stored under refrigeration, in order to facilitate the minimal processing stage and human consumption, finding ideal dose of irradiation that provides total nutritional safety against microorganisms, enlarging fruit shelf life and sustaining quality characteristics. Processing till packing of papaya was executed in Verde Limpo Enterprise, situated on Botucatu/SP. Packing fruits were irradiated on Companhia Brasileira de Irradiação (CBE), placed at Jarinú/SP. Used dose were 0,0; 0.2; 0.4; 0.6; 0.8; and 1.0kGy. After irradiation, the fruits were stored under temperatures of 48.2ºF l 33.8ºF and relative humidity of 90 l 5%, during 9 days and appraised each 2 days. Evaluations were performed each two days, except microbiological analysis, carried up on 1st, 5th and 9th days of conservation. Changes in postharvest quality were detected in the following analysis: loss of fresh weight (LFW), appearance, firmness, titratable acidity (TA), pH, total soluble solids (TSS), vitamin C, total reducer sugars (TRS), reducer sugar (RS), sucrose (S), total pectin (TP), soluble pectin (SP), activity of polygalacturonase (aPG) and pectin methyl esterase (aPME), sensorial analysis (color, aroma, firmness and flavor), disease index and postharvest conservation. Microbiological analysis was performed to identify aerobic bacteria (mesophilic and psychrotrophic), fungi (yeasts and moulds) and coliforms (total and fecal). Data were analyzed according to a completely randomized design, with 4 repetitions per treatment, using SISVAR™ program and Scott-Knottþs test at 5% level of significance. Based on results obtained, it was observed that appearance, color, TA, TP and aPME were significantly improved by gamma irradiation at 0.6kGy...(Complete abstract, click electronic access below)

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