Thermal analysis studies using oscillation DSC to determine changes in LD ethene/butene copolymer induced by gamma radiation treatment

1995 ◽  
Vol 256 (1) ◽  
pp. 137-149 ◽  
Author(s):  
Lars Hälldahl ◽  
Birgitta Olofsson
2017 ◽  
Vol 27 (5) ◽  
pp. 569-575 ◽  
Author(s):  
Tsifhiwa Ramabulana ◽  
Risimati D. Mavunda ◽  
Paul A. Steenkamp ◽  
Lizelle A. Piater ◽  
Ian A. Dubery ◽  
...  

Author(s):  
MARIA APARECIDA COSTA ◽  
VALDEMAR LUIZ TORNISIELO ◽  
JULIO MARCOS MELGES WALDER

O objetivo deste trabalho foi avaliar os níveis residuais de Prochloraz aplicado em mangas, na pré e pós-colheita após o tratamento com radiação. Os frutos foram submetidos à radiação gama na dose de 1,0 kGy visando verificar se a mesma induziu a degradação do fungicida. As mangas tratadas na pós-colheita foram armazenadas por 21 dias a 12 °C. Os resíduos de Prochloraz não apresentaram decréscimo durante o período de carência (21 dias) estabelecido pela Legislação Brasileira de Agrotóxicos. O armazenamento refrigerado (12 °C) e a irradiação gama também não contribuíram para a degradação do fungicida. O Prochloraz ficou retido principalmente na casca (média = 1,64 µg/g), que funcionou como barreira à contaminação da polpa (média = 0,06 µg/g). O produto de degradação, formado nas cascas das mangas tratadas na pós-colheita, foi identificado como sendo o BTS 44596. Os metabólitos, encontrados em níveis baixos, confirmaram a ocorrência de baixa degradação do fungicida em mangas. 14C-PROCHLORAZ RESIDUES IN IRRADIATED MANGOES Abstract The aim of this work was to evaluate the Prochloraz residual levels applied in mangoes, in pre and post-harvest after radiation treatment. The fruits were submitted to gamma radiation with of 1,0 kGy dose, aiming to verify if it induces the fungicide degradation. Treated post-harvest mangoes were stored, at 12 0C during 21 days. Prochloraz residues did not present reduction after safe period (21 days), established by the Brazilian legislation on agrochemicals. The refrigerated storage (12 0C) and the gamma radiation also did not contribute to the degradation of the fungicide. Prochloraz was mainly retained in the peels (mean = 1,64 µg/g) which served as barrier to the pulp (mean = 0,06 µg/g) contamination. The degradation product, formed in peels of post-harvest treated mangoes was the metabolite BTS 44596. The metabolites found in very low levels, confirm that low fungicide degradation occurs in mangoes.


2011 ◽  
Vol 15 (3) ◽  
pp. 107-114 ◽  
Author(s):  
Iram Batool ◽  
Ijaz Ahmad Bhatti ◽  
Shahid Adeel ◽  
Muhammad Abbas

The effect of gamma radiation on the dyeing of cotton with Reactive Blue 13 dye powder has been investigated. The cotton and dye powder are irradiated to absorb doses of 100, 200, 300, 400 and 500 Gy by using a Co-60 gamma irradiator. Dyeing is performed by using irradiated and un-irradiated cotton with irradiated and un-irradiated dye powder, in order to observe the effect of radiation treatment on the colour strength of the reactive dye on cotton. Different dyeing parameters such as temperature, time and p H are optimized using irradiated cotton and dye powder. The effect of gamma irradiation on the colour strength and Lab values has been observed through optimized conditions of dyeing. The colour strength and Lab values are obtained by spectra flash spectrophotometer (SF650). ISO standard methods are employed to study the effect of gamma radiation on the Colourfastness properties of fabric. It can be demonstrated that gamma irradiation not only improves the colour strength of the dye in irradiated cotton, but also enhances the Colourfastness properties.


2006 ◽  
Vol 69 (6) ◽  
pp. 1430-1433 ◽  
Author(s):  
KATHLEEN T. RAJKOWSKI ◽  
STEVEN E. NIEBUHR ◽  
JAMES DICKSON

Mixtures of six Salmonella Typhimurium DT 104 strains were inoculated into three ground pork products to determine the effect of fat content on the radiation resistance of Salmonella DT 104. The ground pork products were 90% lean, 50:50 fat:lean, and 100% fat. Inoculated products were irradiated using a gamma radiation source in a self-contained 137Cesium irradiator or a 10 MeV accelerator producing electrons (e-beam). The radiation D10-values (dose required for a 90% inactivation of viable CFU) for Salmonella DT 104 inoculated into 90% lean ground pork, 50:50 fat/lean ground pork, and 100% pork fat and subjected to beta radiation were 0.42 kGy, 0.43 kGy, and 0.43 kGy, respectively. The corresponding radiation D10-values for Salmonella DT 104 subject to gamma radiation were 0.56, 0.62, and 0.62 kGy, respectively. There was no statistical significant difference (P = 0.3) in radiation D10-values for Salmonella in the three products subject to either radiation treatment. Therefore, fat content had no effect. There was a significant difference (P = 0.001) between the radiation D10-values obtained with the two radiation sources. The radiation D10-values were within the reported range for irradiation destruction of Salmonella contaminated raw meat products.


2009 ◽  
Vol 34 (2) ◽  
pp. 1225-1236
Author(s):  
M. N. El Banna ◽  
H. M. F. El-Wakil ◽  
R. A. Ebaid ◽  
R. A. Sallam

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 487d-487 ◽  
Author(s):  
Yong Cheong Koh ◽  
Fred T. Davies

Seeds of Tillandsia fasciculata var. fasciculata were treated with gamma radiation, gamma and thermal neutron radiations, or ethyl methanesulfonate (EMS) and grown in vitro. Observed chlorophyll deficient phenotypes included yellowish-green, yellow, variegated and albino. The highest combined percentages of chlorophyll deficient phenotypes was 8.7% for the gamma radiation treatment (2.7 krad), 4.6% for the gamma and thermal neutron radiations treatments (combined dose of 2.7 krad at a gamma to thermal neutron ratio of 7.4:1.0), and 10.8% for the EMS treatment (0.4% EMS × 5 h). Some yellowish-green and yellow seedlings multiplied in half strength MS medium with 0.3 or 0.5 μM BA and IBA and the newly formed shoots retained their respective mutant phenotypes. However, the variegated seedlings were sectoral or mericlinal chimeras and when they multiplied, the newly formed shoots were not variegated. The chlorophyll a/chlorophyll b ratio of the wild type seedling was 1.1 whereas that of the yellowish-green and the yellow seedlings was 2.0. Electron micrographs showed that compared to the wild type chloroplasts, the chloroplasts of the yellowish-green and yellow seedlings had fewer grana and fewer thylakoids within each granum.


2015 ◽  
Vol 116 ◽  
pp. 345-348 ◽  
Author(s):  
Adriana S. Medeiros ◽  
Maritza R. Gual ◽  
Claubia Pereira ◽  
Luiz O. Faria

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