scholarly journals The effect of chemical commitments with exposure to gamma irradiation dosage and save time on test attraction and pullet limits of HDPE pack

2020 ◽  
Vol 1572 ◽  
pp. 012074
Author(s):  
I Ratna ◽  
Y Soenarto ◽  
H Seputera
Keyword(s):  
Gamma Irradiation ◽  
Irradiation Dosage

Effects of physical preservation methods on sclerotial germination in Aspergillus flavus and Aspergillus ochraceus in stored grain

1992 ◽  
Vol 70 (6) ◽  
pp. 1206-1210 ◽  
Author(s):  
M. Menasherov ◽  
N. Paster ◽  
R. Nitzan
Keyword(s):  
Gamma Irradiation ◽  
Aspergillus Flavus ◽  
Combined Treatment ◽  
Aspergillus Ochraceus ◽  
Combined Treatments ◽  
Stored Grain ◽  
Modified Atmospheres ◽  
Irradiation Dosage ◽  
Different Levels ◽  
Sclerotial Germination

Germination of sclerotia of Aspergillus flavus and Aspergillus ochraceus was assessed following gamma irradiation during exposure to different levels of relative humidities or to various modified atmospheres. The effect of combined treatments on germination was also studied. No sclerotia of either fungi germinated following irradiation with 2.5 kGy. At 80% relative humidity, germination was almost completely inhibited during 50 days of exposure. Sclerotia of A. flavus were found to tolerate higher levels of CO2 than those of A. ochraceus, and 100% germination of the former, but not the latter, occurred at 80% CO2 (given with either 20 or 5% O2). Germination of A. flavus sclerotia was markedly reduced only at modified atmospheres of 40% CO2 and 1% O2. Working with two sublethal dosages of gamma irradiation, 1.0 and 1.5 kGy, it was demonstrated that less CO2 was needed in the atmosphere (with 20% O2) to reduce germination as the irradiation dosage increased. The advantages of the combined treatment compared with each treatment applied alone are discussed. Key words: sclerotia, germination, Aspergillus, inhibition, physical methods.

Effect of Gamma Irradiation Crosslinking on PA6 Fibers

2012 ◽  
Vol 476-478 ◽  
pp. 2280-2283
Author(s):  
Shi Feng Zhu ◽  
Mei Wu Shi ◽  
Guo Liang Dai
Keyword(s):  
Gamma Irradiation ◽  
Melting Temperature ◽  
Breaking Strength ◽  
Absorbed Dose ◽  
Onset Temperature ◽  
Structure And Properties ◽  
Elongation At Break ◽  
Irradiation Dosage

Gamma irradiation crosslinking of nylon6 fibers with and without the presence of triallyl cyanurate(TAC) was studied, XRD、DSC、IR and TG were used to analyze the effects of irradiation crosslinking on structure and properties of PA6 fibers. The melt-drip performance of PA6 fibers was improved after irradiation crosslinking. The breaking strength increased first then decreased as a function of absorbed dose, while elongation at break decreased. The melting temperature and crystallinity decreased with increasing the dose. Besides, the onset temperature of degradation fell slightly and the amount of non-volatile residue at 600oC increased as the irradiation dosage increased.

scholarly journals Induction of Variability in Three Nigerian Pepper Varieties using Gamma Irradiation

2020 ◽  
pp. 111-119
Author(s):  
N. E. Abu ◽  
E. O. Ojua ◽  
O. U. Udensi
Keyword(s):  
Gamma Irradiation ◽  
Morphological Traits ◽  
Agronomic Traits ◽  
Fruit Weight ◽  
Fruit Yield ◽  
Yield Traits ◽  
Botanic Garden ◽  
60Co Source ◽  
Irradiation Dosage ◽  
The University

This study was aimed at inducing mutation on three cultivars of Capsicum annuum L. to source for new and favourable genetic variations that could be exploited for better agronomic traits. The mutation was induced by exposing the seeds of Shombo, Tatase and Nsukka yellow pepper to varied dosages (0, 50, 100, 150 and 200 Gy from 60Co source) of gamma irradiation. The study was conducted in the Botanic Garden of the University of Nigeria. Seeds exposed to 50Gy produced significantly (P < 0.05) the highest number of fruits per plant, highest fruit yield and improved morphological traits in Shombo. Higher dosages of irradiation gave lower fruits per plant and yields than untreated seeds in Shombo. Tatase irradiated with 150 Gy had significantly the highest single fresh fruit weight. Generally in Tatase 50, 100 and 150Gy increased some morphological traits significantly (P < 0.05). Although 50 Gy gave highest number of fruits per plant, 100, 150 and 200Gy had significantly higher fruit yield with yield increasing as dosage increased. For Nsukka yellow, irradiation did not show a consistent pattern in improving morphological traits. But 200Gy produced significantly the highest number of fruits per plant and highest yield. Gamma irradiation dosage of 50 – 200 Gy can be exploited to create variability for improvement of morphological and yield traits in pepper plants.

The Relationship of the Efficiency of Energy Conversion Into Growth as an Indicator for the Determination of the Optimal Dosage for Mutation Breeding With the Appearance of Chromosomal Bridges, Ring Chromosomes, Micronuclei and Incomplete Mitosis After Gamma Irradiation of Kernels of Triticum Turgidum Ssp. Durum L. Cultivar Orania

2021 ◽  
Author(s):  
EBEN VON WELL ◽  
ANNABEL FOSSEY ◽  
MARDÉ BOOYSE
Keyword(s):  
Gamma Irradiation ◽  
Energy Conversion ◽  
Triticum Turgidum ◽  
Mutation Breeding ◽  
Optimal Dosage ◽  
Ring Chromosomes ◽  
Irradiation Dosage ◽  
The One ◽  
The Ideal

Abstract BackgroundA 50% growth reduction of seedling height (GR50) after acute gamma irradiation of dormant kernels is widely used as a measure of irradiation damage to obtain the ideal irradiation dosage for mutation breeding. It became clear in recent years that the GR50 is not sensitive enough to predict the ideal gamma irradiation dosage for mutation breeding and it predicts a value that is higher than ideal. The study aim was to determine whether root, shoot and seedling growth on the one side and the efficiency of energy conversion into growth on the other are measuring different growth retardation effects of gamma irradiation that are the result of DNA damage (bridges, ring chromosomes, micronuclei, incomplete mitosis) in Triticum turgidum ssp. durum. If the efficiency of energy conversion into growth is measuring different effects, the usefulness of efficiency of energy conversion into growth to predict the optimal dosage for mutation breeding will be investigated. ResultsThe kernels were gamma irradiated from 50 - 350 Gy using a 60Cobalt source. The kernels were left to germinate and grow for a period of 132 hours for the shoot and root growth and the efficiency of energy conversion into growth determination and for a period of 47.5 hours for the determination of the number of bridges, ring chromosomes, micronuclei and incomplete mitosis. The control differed highly significantly from 50 Gy and higher dosages and from 250 Gy and higher dosages for root and shoot growth respectively and from 250 Gy for the efficiency of energy conversion into growth. There was a highly significant increase in the number of bridges and micronuclei between 50 Gy and 150 Gy together with the higher irradiation dosages and only from 250 Gy for the ring chromosomes and interphase cells with incomplete mitosis. Root and seedling growth on the one hand and the efficiency of energy conversion into growth on the other were found to be measuring different effects of gamma irradiation on plant growth. ConclusionThe optimal dosage for mutation breeding was determined by making use of the efficiency of energy conversion into growth.

Synthesis and Characterization of Poly(Glycerol Sebacate)-co-Lactic Acid via Gamma Irradiation

2015 ◽  
Vol 1098 ◽  
pp. 75-79
Author(s):  
Michael Giles B. Dupio ◽  
Gandy M. Nunez ◽  
Lucille V. Abad ◽  
Charito T. Aranilla ◽  
Eduardo R. Magdaluyo
Keyword(s):  
Lactic Acid ◽  
Thermal Properties ◽  
Methyl Methacrylate ◽  
Gamma Irradiation ◽  
Polymer Structure ◽  
Polymer Materials ◽  
Synthesis And Characterization ◽  
Irradiation Dosage ◽  
Ester Linkage

The gamma irradiation was utilized to facilitate the synthesis of poly (glycerol sebacate)-co-lactic acid (PGS-co-LA). The effect of methyl methacrylate (MMA) crosslinker and varying dosage of irradiation to the structural composition and thermal properties of the synthesized PGS-co-LA was investigated. Compositional analyses of the polymer materials using infrared spectroscopy confirm the covalent formation of ester linkage. The use of methyl methacrylate enhances the formation of the characteristic bonds in the polymer structure. The intensity of these peaks increases with increasing irradiation dosage and high amount of crosslinker. The melting temperature of the PGS-co-LA becomes more negative with the incorporation of high amount of MMA.

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