Consulta: subjectFacets:"Gamma radiation"
Registros recuperados: 27
Data/hora: 08/06/2024 18:07:21

Calibration curves by 60Co with low dose rate are different in terms of dose estimation – a comparative study
Provedor de dados: 74
Autores: 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

Uso de radiação gama para obtenção de mutantes de pimenta-do-reino.
Provedor de dados: 14
Autores: ALBUQUERQUE, F. C. de; HIRAKATA, K.; ANDO, A.; MENTEN, J. O. M.
bitstream/item/57829/1/CPATU-PA44.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Pimenta-do-reino; Tratamento da semente; Tratamento da gema; Radiação gama; Selection.; Melhoramento; Piper Nigrum; Seleção.; Gamma radiation; Plant breeding; Seed treatment.
Ano: 1981
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/378090

Efeito de doses de irradiação gama sobre gemas germinadas de cana de açúcar (Saccharum Spp).
Provedor de dados: 14
Autores: 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; Irradiação gama.; Cana de açúcar; Raio gama.; Sugarcane; Saccharum; Irradiation; Gamma radiation.
Ano: 2018
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1087630

Effect of ionizing radiation onVibrio bacteria in Crassostrea virginica (American oyster)
Provedor de dados: 5
Autores: 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

Mutagenesis in Lupinus polyphyllus a tool for producing spring variants?
Provedor de dados: 46
Autores: Fatta,N.; Mascarini,A; Lopez,S.
Lupinus polyphyllus remains vegetative during the first year, stores cold during winter and is induced to blossoming in the second year. Inflorescences are attractive and varied coloured terminal clusters. In Buenos Aires the historical average winter temperature is 11.5 ºC and the number of hours of cold are not enough for L. polyphyllus to flower so there is no commercial offer in pots. The line of work chosen to produce genetic variability in L. polyphyllus, was induced mutagenesis with the purpose of rescuing genetic variants that meet the required cold naturally in Buenos Aires and capable of flowering and producing viable seeds. Seeds harvested in Bariloche were sown on september 4, 2003. 600 seedlings received gamma radiation at a rate of 50 Gy and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vernalization; Qualitative character; Gamma radiation; Plant variety.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-62332008000200002

Hematological changes in sheep inoculated with natural and Cobalt60-irradiated Crotalus durissus terrificus venom (Laurenti, 1768)
Provedor de dados: 80
Autores: 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

New insights into the structural characteristics of irradiated crotamine
Provedor de dados: 80
Autores: Oliveira,Karina Corleto; Spencer,Patrick Jack; Ferreira Jr,Rui Seabra; Nascimento,Nanci.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gamma radiation; Structural modifications; Crotamine; Snake venom; Crotalus durissus terrificus.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992015000100321

Análisis de la problemática de la contaminación por Cs-137 en los ecosistemas Antárticos
Provedor de dados: 20
Autores: 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

Estudio de la presencia de gas radón y radiometría gamma superficial en el área de la Punta Fort William
Provedor de dados: 20
Autores: 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

New wheat genotypes tolerant to aluminum toxicity obtained by mutation induction
Provedor de dados: 86
Autores: Tulmann Neto,Augusto; Alves,Marcelo Correa; Camargo,Carlos Eduardo de Oliveira; Castro,Jairo Lopes de; Ferreira Filho,Wilson Penteado.
Seed from the sensitive wheat (Triticum aestivumL.) cultivar Anahuac was treated to gamma-ray irradiation and eleven Al3+ tolerant mutants selected. The objective was to compare these mutants to the original Anahuac and to the tolerant wheat cultivars IAC-24 and IAC-60 from 1994 to 1996 in acid (Capão Bonito) and limed (Monte Alegre do Sul) soil field trials, in the State of São Paulo, Brazil. Grain yield and agronomic characteristics were analyzed. All the mutant lines yielded higher than the sensitive Anahuac cultivar in the acid soils of Capão Bonito. Under limed soil conditions, 10 mutants had a similar yield to the original sensitive cultivar and one a lower yield. The majority of the mutants were similar in yield to the tolerant cultivars IAC-24 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acid soil; Liming; Breeding methods; Mutants; Gamma radiation; Agronomic characters; Grain yield; Plant breeding.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2001000100008

Mutation induction as a strategy to overcome the restricted genetic base in Physalis
Provedor de dados: 94
Autores: Trevisani,Nicole; Melo,Rita Carolina de; Bernardy,João Pedro Fossa; Pierre,Patrícia Maria Oliveira; Coimbra,Jefferson Luís Meirelles; Guidolin,Altamir Frederico.
Abstract  The restricted genetic base in physalis in Southern Brazil is a challenge that requires genetic breeding for the achievement of fruits with superior agronomic quality. Therefore, genetic changes were induced in physalis for the selection of populations with superior fruit quality. To that end, seven populations of physalis were submitted to gamma irradiation (0,100 and 200 Grays – Gy), which provided 21 populations. Significant population difference was observed, which indicates the existence of variability between at least two populations of physalis. The contrasts showed difference for Colômbia01, Colômbia02, Caçador and CAV. The mutation induction was effective at causing genetic variations in these populations. For Colombia01 (100 Gy), it was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Small fruit; Gamma radiation; Cobalt60; Selection.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452018000300801

POSTHARVEST OF IRRADIATED TAHITI LIME FRUITS
Provedor de dados: 94
Autores: SILVA,SIMONE RODRIGUES DA; BEZERRA,DÉBORA NANCY FERNANDES; BASSAN,MEIRE MENEZES; CANTUARIAS-AVILÉS,TATIANA; ARTHUR,VALTER.
ABSTRACT  This study aimed to evaluate the postharvest quality evolution of gamma-irradiated ‘Tahiti’ limes. Shiny, olivegreen fruits with coarse skin (56 cm equatorial diameter) harvested in commercial orchars and processed in commercial packing house line were used. In a preliminary assay, fruits harvested in April 2011 were exposed to a gamma radiation range from 0 to 750 Gy. The 250 and 750 Gy doses negatively affected skin quality and pulp of exposed fruits. For this reason, new assays were carried out using lower doses to irradiate fruits harvested in July 2011 (off-season) and January 2012 (regular harvest period). Fruit harvested in both periods were selected and exposed to radiation doses of 0, 50, 100, 150, and 200 Gy. All irradiations occurred...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus latifolia; Conservation; Gamma radiation; Fruit quality.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452016000400302

Gamma-ray beam attenuation as an auxiliary technique for the evaluation of the soil water retention curve
Provedor de dados: 63
Autores: 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

Survival and mutant production induced by mutagenic agents in Metarhizium anisopliae
Provedor de dados: 63
Autores: Kava - Cordeiro,V.; Luna - Alves - Lima,E.A.; Azevedo,J.L.
A wild strain of Metarhizium anisopliae, an entomopathogenic fungus, was submitted to three mutagenic agents: gamma radiation, ultraviolet light and nitrous acid. Survival curves were obtained and mutants were selected using different mutagenic doses which gave 1 to 5% survival. Morphological and auxotrophic mutants were isolated. Morphological mutants were grouped in a class with yellow conidia and other with pale vinaceous conidia as opposed to the green wild type conidia. Auxotrophic mutants had requirements for vitamin and aminoacid biosynthesis. More than 58% of the total auxotrophk mutants required proline/aipnine. Gamma radiation showed to be the most efficient mutagenic agent giving 0.2% of auxotrophk mutants followed by ultraviolet light (0.12%)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Metarhizium anisopliae; Auxotrophk mutants; Colour mutants; Mutagenic agents; Gamma radiation; Ultraviolet light; Nitrous acid.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300023

Fermentation of irradiated sugarcane must
Provedor de dados: 63
Autores: 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

Effects of gamma radiation on the sterility and behavioral quality of the caribbean fruit fly, Anastrepha suspensa (Loew) (Diptera:Tephritidae)
Provedor de dados: 63
Autores: 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

Micropropagated banana plants induced by gamma irradiation and resistant to the root-knot nematode reproduction
Provedor de dados: 111
Autores: Taha, Rania Abdel-Ghaffar; El-Nagdi, Wafaa M. A.; Kamel, Hedaya Ahmed.
Micropropagation of banana plants has been used successfully in commerce. Banana plantation has a great interest in Egypt due to suitable climate. However, some problems might thwart the plantation progress like the root-knot nematode; Meloidogyne incognita infection which can affect acclimatization and plantation of in vitro plants. Thus, our investigation aimed to produce nematode resistant in vitro plants using gamma radiation (γ). Banana in vitro plantlets were exposed to gamma radiation at several doses then replanted in vitro. Sensitivity of banana plants to irradiation was determined. Acclimatized plants were infected with M. incognita in greenhouse to see their capability for tolerance. Results indicated that irradiated plants could manage the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa sp.; Micropropagation; Gamma radiation; Meloidogyne incognita; Free amino acids.
Ano: 2020
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5500

Heartwood and sapwood in eucalyptus trees: non-conventional approach to wood quality
Provedor de dados: 42
Autores: 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

Ionizing radiation quarantine treatments
Provedor de dados: 44
Autores: 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

THE RADIO SENSITIZING EFFECT OF METRONIDAZOLE IN MAIZE
Provedor de dados: 53
Autores: VICCINI,LYDERSON FACIO; SARAIVA,LUIZ SÉRGIO; ALMEIDA FILHO,JOSÉ DE; CRUZ,COSME DAMIÃO; ANDRADE,ROGÉRIO ALVAREZ DE.
The identification of chemical substances which increase the efficiency of radiation is important to make easier the obtention of plants with structural chromosome aberrations which may be used in an alternative program for hybrid maize production. The present work was carried out to investigate the effect of the chemical substance metronidazole in maize seedlings submitted to gamma radiation. Several treatments were done, soaking the seeds in solutions with varied concentrations of the active substance combined with solution filtration and gamma radiation. On the third day of the experiment, germination percentage, root and stem lengths were evaluated. At a high concentration (1,250 mg/50 mL) metronidazole behaved as a radiosensibilizer in the presence of...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Corn; Zea mays; Gamma radiation; Metronidazole.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051997000200004

Effect of gamma radiation on lipids by the TBARS and NMR
Provedor de dados: 52
Autores: 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

Effect of Gamma Radiation on Growth and Metabolic Activities of Arthrospira platensis
Provedor de dados: 52
Autores: 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

Changes in electrophoretic profiles of Ipomoea batatas (sweet potato) induced by gamma radiation
Provedor de dados: 52
Autores: 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

Effects of 60Co gamma radiation on crotamine
Provedor de dados: 56
Autores: 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

Inactivation of Escherichia coli O157:H7 in hamburgers by gamma irradiation
Provedor de dados: 58
Autores: 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

Effect of gamma radiation on the inactivation of aflatoxin B1 in food and feed crops
Provedor de dados: 58
Autores: 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

Evaluation of viability of Aspergillus flavus and aflatoxins degradation in irradiated samples of maize
Provedor de dados: 58
Autores: 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