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Registros recuperados: 32
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Análisis de la problemática de la contaminación por Cs-137 en los ecosistemas Antárticos OceanDocs
Vega, M.; Rueda, M.; Valencia T., M..
La sensibilidad del medio ecológico Antártico obliga a conocer los diferentes niveles de contaminación de origen convencional y nuclear, con el fin de establecer posibles acciones tendientes a impedir que futuros accidentes e incidentes atenten contra sus ecosistemas. La evaluación de la concentración de Cs-137, como radionucleído gamma radiante, en agua, suelos y plantas, permite establecer la movilidad de este isótopo, considerando entre los más importantes elementos de contaminación originadas en los procesos de fisión nuclear. Se tomaron muestras de los tres medios anotados anteriormente, se las analizaron luego mediante espectroscopía gamma, encontrándose que en agua y en vegetales, los niveles de Cs-137 están por debajo de los límites de detección,...
Tipo: Journal Contribution Palavras-chave: Radioisotopes; Radioactive contamination; Gamma radiation; Gamma spectroscopy; Biodiversity; Polar zones; Radioisotopes; Radioactive contamination; Gamma radiation; Biodiversity; Http://aims.fao.org/aos/agrovoc/c_6430; Http://aims.fao.org/aos/agrovoc/c_28321; Http://aims.fao.org/aos/agrovoc/c_3186; Http://aims.fao.org/aos/agrovoc/c_33949.
Ano: 1990 URL: http://hdl.handle.net/1834/3726
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Calibration curves by 60Co with low dose rate are different in terms of dose estimation – a comparative study Genet. Mol. Biol.
Mendes,Mariana Esposito; Mendonça,Julyanne Conceição Goes de; Hwang,Suy; Giorgio,Marina Di; Lima,Fabiana Farias de; Santos,Neide.
Abstract Biological dosimetry aims to estimate individual absorbed doses due ionizing radiation exposure. The dicentric chromosomes are considered the most specific biomarker for dose estimation. This study aimed to compare calibration curves for linear low energy transfer (LET) radiation built from low dose rates and whether they vary in terms of dose estimation. For that we did a search in the literature of all calibration curves produced with low dose rates and we simulated the dose estimation from pre-established dicentric’s frequencies. The information on methodologies and cytogenetic results of each study were analyzed. As expected dose rate influence β coefficients, especially at higher doses. However, we have seen that some doses were not...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dicentrics; Gamma radiation; Biological dosimetry; Intercomparisons.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000100108
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Caracterização físico-química de frutos de maracujazeiro amarelo provenientes da irradiação com raios gama. Repositório Alice
FLORES, P. S.; SILCA, D. F. P. da; BRUCKNER, C. H.; OLIVEIRA, S. P. de; SALOMÃO, L. C. C..
A indução de mutações tem sido utilizada em programas de melhoramento de algumas culturas economicamente importantes, como ferramenta para complementar as técnicas de melhoramento convencional. Em estudos prévios, observou-se que, através da indução de mutações com irradiações com raios gama, foi possível obter plantas de maracujazeiro amarelo resistentes a fusariose, uma das principais doenças que ataca a cultura. Porém, estudos sobre caracteres agronômicos relacionados com a qualidade dos frutos são fundamentais para avaliação desses genótipos resistentes. Neste trabalho, foram analisadas as características físicas e químicas dos frutos de plantas de Passiflora edulis Sims provenientes da irradiação com raios gama. Os valores obtidos com as análises...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Maracujá amarelo; Yellow passion fruit; Maracuyá amarillo; Passiflora edulis f flavicarpa; Melhoramento genético vegetal; Maracujá; Passiflora edulis; Doença de planta; Fusariose; Variedade resistente; Características agronômicas; Propriedade físico-química; Fruto; Qualidade; Mutação induzida; Radiação atômica; Raio gama; Plant breeding; Passion fruits; Plant diseases and disorders; Fusarium oxysporum; Fruit quality; Agronomic traits; Physicochemical properties; Mutagenesis; Gamma radiation; Fitomejoramiento; Granadillas; Enfermedades y desórdenes de las plantas; Calidad de la fruta; Características agronómicas; Propiedades fisicoquímicas; Mutagénesis; Radiación gamma.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/916469
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Causas da redução do crescimento do feijoeiro (Phaseolus vulgaris,L) sobre solo esterilizado. Repositório Alice
PRIMAVESI, O.; TSAI, S. M.; FAQUIN, V..
Este trabalho estudou os métodos mais usados de estirilazação em amostras de terra da camada aravel de um solo com textura franco-argilosa e outro arenoso. Ostratamentos envolveram brometo de metila, radiação gama, vapor fluente e autoclavagem.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Esterilização do solo; Franco-argilosa; Arenoso; Autoclavagem; Radiação gama; Vapor fluente; Redução de crescimento; Soil sterelization; Autoclaving; Gamma radiation; Stream heating; Methylbromide; Beans plant.
Ano: 1989 URL: http://www.alice.cnptia.embrapa.br/handle/doc/42287
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Changes in electrophoretic profiles of Ipomoea batatas (sweet potato) induced by gamma radiation BABT
Lage,Celso Luiz Salgueiro; Vasconcellos,Alexandre Guimarães; Silva,Nina Claudia Barboza da; Esquibel,Maria Apparecida.
The ability of nodal segments of Ipomoea batatas to differentiate shoots and roots was evaluated after gamma irradiation. Shoot differentiation was less sensitive to irradiation than roots. However, at 90 Gy, no shoot was able to regenerate a new plant; in contrast 76 % of the roots from irradiated nodal segments continued to grow. The gamma radiation also induced changes in electrophoretic profiles of peroxidases of storage roots. Plants originated from irradiated storage roots presented changes in leaf peroxidase profiles very similar to those produced by leaves directly irradiated. The peroxidase profile of absorbent roots from irradiated storage roots was different from that obtained from directly irradiated absorbent roots.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Peroxidases; Gamma radiation; Sweet potato; Ipomoea batatas; Convovulaceae.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000200008
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Efeito de doses de irradiação gama sobre gemas germinadas de cana de açúcar (Saccharum Spp). Infoteca-e
MARCHIORI, L. F. S.; ARTHUR, V.; SILVA, F. C. da; RAPOSO, M. S.; SILVA, G. S. P. L. da; GOIA, T. G..
Introdução. Metodologia. Materiais. Métodos. Resultados e discussões. Conclusão.
Tipo: Capítulo em livro técnico (INFOTECA-E) Palavras-chave: Cobalto 60; Cana de açúcar; Irradiação gama; Raio gama; Sugarcane; Saccharum; Irradiation; Gamma radiation.
Ano: 2018 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1087630
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Effect of Gamma Radiation on Growth and Metabolic Activities of Arthrospira platensis BABT
Abomohra,Abo El-Fatah; El-Shouny,Wagih; Sharaf,Mona; Abo-Eleneen,Mai.
This work aimed to study the influence of gamma radiation on the growth and production of some active substances of Arthrospira platensis. Biomass production was significantly inhibited (p ≤ 0.05) by 21 and 34%, with respect to the control at 2.0 and 2.5 kGy, respectively. Chlorophyll-a content showed 11% reduction at 2.5 kGy compared to the control. As a result of growth and Chl-a inhibition, chlorophyll productivity recorded a continuous significant decrease below the control in the cells exposed to 1, 1.5, 2 and 2.5 kGy by 8, 12, 15 and 25%, respectively after 15 days of incubation. In addition, phycobillins productivity showed significant decrease by 10 and 36% below the control at 2 and 2.5 kGy of gamma radiation, respectively. Protein production...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Arthrospira platensis; Spirulina platensis; Gamma radiation; Metabolic activity; Nutritional value.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100409
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Effect of gamma radiation on lipids by the TBARS and NMR BABT
Silva,Adriana Cristina de Oliveira; Mársico,Eliane Teixeira; Jesus,Edgar Francisco Oliveira de; Guimarães,Carlos Frederico; Cortez,Marco Antonio Sloboda.
The aim of this work was to study the effect of gamma radiation on lipids by TBARS and NMR. The samples of raw whole milk were subjected to gamma radiation from Co60 in doses of 1, 2 and 3 kGy and the production of rancidity was studied through Nuclear Magnetic Resonance (NMR) and Thiobarbituric Acid Test (2-TBARS). The TBARS values increased according to the intensity of the radiation dose applied at the samples, demonstrating correlation between the radiation dose and the production of lipid oxidation. This was confirmed by NMR with the formation of peaks of aldehydes and ketones that were small and similar in the doses of 1 and 2 kGy. In the dose of 3 kGy, the total degradation of milk fat was observed. A correlation between the NMR and 2-TBA was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Milk; Gamma radiation; Rancidity; Thiobarbituric Acid Test; Nuclear Magnetic Resonance (NMR).
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000600021
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Effect of gamma radiation on the inactivation of aflatoxin B1 in food and feed crops BJM
Ghanem,I.; Orfi,M.; Shamma,M..
Samples of food crops (peanut, peeled pistachio, unpeeled pistachio, rice, and corn) and feed (barley, bran, corn) were autoclave-sterilized, and inoculated with 10(6) of spore suspension of an isolate of Aspergillus flavus fungus known to produce aflatoxin B1 (AFB1) . Following a 10-day period of incubation at 27 C to allow for fungal growth, food and feed samples were irradiated with gamma radiation at the doses 4, 6, and 10 kGy. Results indicated that degradation of AFB1 was positively correlated with the increase in the applied dose of gamma ray for each tested sample. At a dose of 10 kGy percentages of AFB1 degradation reached highest values at 58.6, 68.8, 84.6, 81.1 and 87.8% for peanuts, peeled pistachios, unpeeled pistachios, corn and rice samples,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aflatoxin B1; Food feed; Gamma radiation.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822008000400035
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Effect of ionizing radiation onVibrio bacteria in Crassostrea virginica (American oyster) ArchiMer
Eberiel, D; Dooley, K; Langton, L; Malleth, J.
The presence of Vibrio bacteria in raw shellfish poses a significant health hazard to the consuming public. These human pathogens are natural, seasonal components of the microbial flora of shellfish which can result in primary septicemic or diarrheal fatal infections. Existing shellfish depuration neither targets nor eliminates the Vibrio bacteria. For this reason, additional purification processes are necessary. In this study, the effect of low dose gamma radiation on the inactivation ofVibrio cholerae (01 and non 01) and vulnificus is investigated. Log decrement (D10) values ranging only to a high of 0.09 KGy in the Vibrio strains support the hypothesis that food irradiation technology can provide an additional effective and efficient shellfish...
Tipo: Text Palavras-chave: USA Coasts; USA; Vibrio vulnificus; Vibrio cholerae; Crassostrea virginica; Bivalvia; Vibrio; Bacteria; Self purification; Marine molluscs; Irradiation; Gamma radiation; Ionizing radiation; Oyster culture.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1619.pdf
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Effects of 60Co gamma radiation on crotamine BJMBR
Boni-Mitake,M.; Costa,H.; Spencer,P.J.; Vassilieff,V.S.; Rogero,J.R..
Ionizing radiation can change the molecular structure and affect the biological properties of biomolecules. This has been employed to attenuate animal toxins. Crotamine is a strongly basic polypeptide (pI 10.3) from Crotalus durissus terrificus venom composed of 42 amino acid residues. It induces skeletal muscle spasms leading to a spastic paralysis of hind limbs in mice. The objective of the present study was to carry out a biochemical study and a toxic activity assay on native and irradiated crotamine. Crotamine was purified from C.d. terrificus venom by Sephadex G-100 gel filtration followed by ion-exchange chromatography, and irradiated at 2 mg/ml in 0.15 M NaCl with 2.0 kGy gamma radiation emitted by a 60Co source. The native and irradiated toxins...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Crotamine; Gamma radiation; Chromatography; Toxicity; Circular dichroism.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001001200004
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Effects of gamma radiation on the sterility and behavioral quality of the caribbean fruit fly, Anastrepha suspensa (Loew) (Diptera:Tephritidae) Scientia Agricola
Walder,J.M.M.; Calkins,C.O..
Pupae of Anastrepha suspensa (Loew) were irradiated 2 days before adult eclosión in an air atmosphere with 15, 20, 25, 30, 50 and 70 Gy of gamma radiation (Co-60). The radiation effects on sterility and other parameters of quality and behavior of males and females of caribfly were established. Males became fully sterile with a dose of 50 Gy and females laid no eggs when exposed to 25 Gy. Radiation had no significant effect on adult eclosion, sex ratio, flight ability and irritability, but female mortality was affected significantly by radiation, showing higher survival rates in low dosage treatments. The mating behavior of the males was reduced significantly by increasing the radiation doses.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Anastrepha suspensa; Gamma radiation; Sterility; Behavior.
Ano: 1993 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200001
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Estudio de la presencia de gas radón y radiometría gamma superficial en el área de la Punta Fort William OceanDocs
Fajardo, M..
La Comisión Ecuatoriana de Energía Atómica, durante los últimos años ha realizado investigaciones sobre la presencia de radón en el Ecuador con un sin fín de propósitos: Radón en espacios contaminados, contaminación de radón en labores mineras, radón aplicado a detección de uranio (Prospección y exploración de uranio), obteniéndose resultados que en su debido momento han sido publicados en diferentes informes a través de la C.E.E.A. Dentro del Programa Antártico Ecuatoriano, se planteó realizar investigación, sobre la presencia del gas radón y radiometría gamma superficial en Punta Fort William, que luego se amplió al Estrecho de Bransfield, utilizando equipos portátiles a baterías, que permitió realizar estudios en zonas inhóspitas, donde no existe una...
Tipo: Journal Contribution Palavras-chave: Radon; Electromagnetic radiation; Gamma radiation; Electromagnetic radiation; Radon; Gamma radiation; Http://aims.fao.org/aos/agrovoc/c_36146; Http://aims.fao.org/aos/agrovoc/c_32529; Http://aims.fao.org/aos/agrovoc/c_3186.
Ano: 1998 URL: http://hdl.handle.net/1834/3842
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Evaluation of viability of Aspergillus flavus and aflatoxins degradation in irradiated samples of maize BJM
Aquino,Simone; Ferreira,Fabiane; Ribeiro,Deise Helena Baggio; Corrêa,Benedito; Greiner,Ralf; Villavicencio,Anna Lucia Casañas Haasis.
One of the currently most important fungi in stored grains is Aspergillus flavus, which produce aflatoxins. This fungus can grow on diverse substrates and represents a serious public health and animal nutritional problem. Therefore, the study of techniques that can be applied to the control of aflatoxins is of great importance. The objective of the present study was to determine the effects of gamma radiation on the growth of Aspergillus flavus Link and on degradation of aflatoxin B1 and B2 (AFB1 and AFB2) at a relative humidity of 97 99% and a water activity (Aw) of 0.88-0.94. Samples of corn grains were irradiated using a cobalt 60 source emitting gamma rays at doses of 2, 5 and 10 kGy. Irradiation was found to be effective in reducing the number...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gamma radiation; Aspergillus flavus; Fluorescent viability test; Water activity; Maize.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000400009
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Fermentation of irradiated sugarcane must Scientia Agricola
Alcarde,André Ricardo; Walder,Júlio Marcos Melges; Horii,Jorge.
Bacillus and Lactobacillus are bacteria that usually contaminate the ethanolic fermentation by yeasts and may influence yeast viability. As microorganisms can be killed by ionizing radiation, the efficacy of gamma radiation in reducing the population of certain contaminating bacteria from sugarcane must was examined and, as a consequence, the beneficial effect of lethal doses of radiation on some parameters of yeast-based ethanolic fermentation was verified. Must from sugarcane juice was inoculated with bacteria of the genera Bacillus and Lactobacillus. The contaminated must was irradiated with 2.0, 4.0, 6.0, 8.0 and 10.0 kGy of gamma radiation. After ethanolic fermentation by the yeast (Saccharomyces cerevisiae) the total and volatile acidity produced...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bacteria; Gamma radiation; Yeast.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400011
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Gamma-ray beam attenuation as an auxiliary technique for the evaluation of the soil water retention curve Scientia Agricola
BACCHI,O.O.S.; REICHARDT,K.; OLIVEIRA,J.C.M.; NIELSEN,D.R..
The soil water retention curve is fundamental for the hydraulic characterization of a soil and has many applications in agricultural research as well as in practical agriculture. A new procedure for soil moisture and soil bulk density evaluation inside closed pressure chambers through gamma-ray beam attenuation is presented. The proposed procedure presents several advantages in relation to the traditional process: avoids the need of continuous sample manipulation; minimizes the problem of hysteresis; allows a more precise evaluation of soil moisture by taking into account changes of soil bulk density due to swelling or shrinking on addition or removal of water; allows frequent evaluation of soil moisture without the need of opening the pressure chamber;...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gamma attenuation; Gamma radiation; Soil water retention.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300019
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Heartwood and sapwood in eucalyptus trees: non-conventional approach to wood quality Anais da ABC (AABC)
CHERELLI,SABRINA G.; SARTORI,MARIA MÁRCIA P.; PRÓSPERO,ANDRÉ G.; BALLARIN,ADRIANO W..
ABSTRACT This study evaluated the quality of heartwood and sapwood from mature trees of three species of Eucalyptus, by means of the qualification of their proportion, determination of basic and apparent density using non-destructive attenuation of gamma radiation technique and calculation of the density uniformity index. Six trees of each species (Eucalyptus grandis - 18 years old, Eucalyptus tereticornis - 35 years old and Corymbia citriodora - 28 years old) were used in the experimental program. The heartwood and sapwood were delimited by macroscopic analysis and the calculation of areas and percentage of heartwood and sapwood were performed using digital image. The uniformity index was calculated following methodology which numerically quantifies the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gamma radiation; Image analysis; Eucalyptus; Density uniformity index.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100425
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Hematological changes in sheep inoculated with natural and Cobalt60-irradiated Crotalus durissus terrificus venom (Laurenti, 1768) J. Venom. Anim. Toxins incl. Trop. Dis.
Netto,D. P.; Chiacchio,S. B.; Bicudo,P. L.; Alfieri,A. A.; Balarim,M. R. S.; Nascimento,N..
Natural (NV) and Cobalto60-irradiated (IrV) Crotalus durissus terrificus venom were used to evaluate serum production capacity of sheep and possible hematological and biochemical effects. Freeze-dried venom aliquots were diluted in acidified saline solution (NaCl 150 mM, pH 3.0) and irradiated by a Cobalt 60 source at a dose of 5.54 x 102 Gy/h and a concentration of 2.000 Gy. Twelve sheep were divided into two groups of six animals. One group received irradiated venom (IrV) and the other natural venom (NV). Three antigen doses (venom) were administered at monthly intervals. Blood samples were collected weekly for analysis of serum neutralization potency and capacity, complete blood count (CBC), total plasma protein, fibrinogen, albumin, and globulin. At...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hematology; Gamma radiation; Irradiated crotalic venom; Crotalic antiserum; Ovine; Crotalus durissus terrificus.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992004000100004
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Inactivation of Escherichia coli O157:H7 in hamburgers by gamma irradiation BJM
Chirinos,Rodolfo R.O.; Vizeu,Dirceu M.; Destro,Maria Teresa; Franco,Bernadette D.G.M.; Landgraf,Mariza.
Escherichia coli O157:H7 causes bloody diarrhoea, haemorrhagic colitis and life-threatening complications like haemolytic uremic syndrome and thrombotic thrombocitopenic purpura. Among foods associated with outbreaks caused by this pathogen, hamburger is the most common one. The aim of this research was to determine the radiation dose to reduce the population of E. coli O157:H7 in hamburgers to non-detectable levels in order to render a safer product. Hamburgers, inoculated with Escherichia coli O157:H7, were exposed to gamma radiation (60Co) treatment, with doses ranging from 0 to 0.7 kGy. The average temperature during the process was 5.6ºC. Non-inoculated hamburgers were submitted to sensory evaluation after being exposed to irradiation doses of 0.8 kGy...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hamburger; Patties; Escherichia coli O157:H7; Food irradiation; Gamma radiation.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000100011
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Ionizing radiation quarantine treatments Anais da SEB
Hallman,Guy J..
Irradiation is a viable quarantine disinfestation treatment which has been studied for 40 years although it has received very little commercial use. Two principal obstacles to commercial application, 1) the fact that insects are not killed immediately, and 2) consumer opposition to irradiation, have been allayed to some extent, but the remaining impediment to large-scale commercial use is development of approved protocols by government regulatory agencies in importing countries. The United States Department of Agriculture has taken the first step by allowing for the movement of a number of quarantined fruits from Hawaii to the rest of the country following irradiation treatment. The measures of efficacy of irradiation disinfestation treatments should be...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Insecta; Arachnida; Gamma radiation; Irradiation; Postharvest disinfestation.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80591998000300001
Registros recuperados: 32
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