965 resultados para Variância gama
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We establish bounds on the mass scale of effective interactions between fermions and photons using the OPAL data for the reaction e+e-→γγ at √s=91.22 GeV.
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The structure of juruenolide, a constituent of Iryanthera juruensis and I. ulei is revised to (2S, 3R, 4S)-3-hydroxy-4-methyl-2-(19′-piperonyl-1′-n-nonadecyl)-butanolide. The compound is epimeric at C-3 of the γ-lactone unit with grandinolide [(2S, 3S, 4S)-3-hydroxy-4-methyl-2- (19′-phenyl-1′-n-nonadecyl)-butanolide] from I. grandis. An extract of I. juruensis contained additionally juruenolide-B [(4S)-4-methyl-2-(19′-piperonyl-1′-n-nonadec-7′-enyl)-but-2-enolide]. Analogous products with heptadecyl and pentadecyl side chains co-occur with the respective nonadecyl derivatives. © 1983.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Características pós-colheita em frutos de pitaya orgânica submetida a diferentes doses de irradiação
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The objective was to evaluate the influence of different irradiation doses in post-harvest characteristics of pitaya organic species Hylocereus undatus grown in the municipality of Itajobi - SP. The experiment was conducted at the Fruit and Vegetable Department of Agribusiness Management and Technology - FCA / UNESP - Botucatu - SP from December 2008 to January 2009. The radiation process was conducted at the Institute for Energy and Nuclear Research (IPEN) located in Sao Paulo. The design was randomized blocks with six treatments and three replications. The fruits were harvested on the third day after onset of color, selected, cleaned, packed in polystyrene trays covered with PVC film, pre - cooled (8 ° C for 24 hours) and subjected to different doses of gamma irradiation (0.0; 0.2, 0.4, 0.6, 0.8 and 1.0 kGy of cobalt-60) and subsequently stored in cold temperature of 8 degrees C, with relative humidity of about 85 ± 5%. The fruits were evaluated at twenty days after irradiation for pH, soluble solids (SS), Titratable Acidity (TA), ratio (SS / TA) and percentage loss of mass (weight). Data were subjected to analysis of variance and means compared by Tukey test at 5% probability. There were no statistically significant differences (p <0.05) for pH (4.82), soluble solids (11.33) Titratable acidity (0.12) and ratio (79.42) compared to non-irradiated fruit. Regarding the percentage of loss of mass (weight), the highest among the patients treated irradiated with 0.8 kGy (12.12%), whereas for treatment at a dose of 0.0 kGy (irradiated) showed a lower loss weight (11.59%), a result that differs significantly (P <0.05) from the remaining doses of irradiation. The loss of mass (weight) of fruit irradiated with other doses was not statistically significant (P> 0.05).
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The objective of this study was to evaluate the effects of gamma radiation on fruit quality and conservation of mana cubiu through its enzymatic characteristics, with 20 days of storage and 5 taken every 4 days. The fruits selected were subjected to different doses of gamma radiation Co60 (0.0; 0.2; 0.4; 0.6 and 0.8 kGy) packaged in trays of expanded polyethylene then covered with stretchable PVC film associated with refrigerated stored at 10 ± 3°C e 85 ± 5% de UR and evaluated in six periods (0, 4, 8, 12, 16 e 20 days). The variables evaluated were: enzymatic activity of pectin (PME), polygalacturonase (PG), polyphenoloxidase (PPO) and peroxidase (POD). For PG there was no interaction between dose and storage on the day 16 the highest value to 640.10 UE min-1 g-1 and 0.8 kGy dose showed the lowest with 376.37 10 UE min-1 g-1. PME now get in 16 days and 0.8 kGy dose the highest values of the experiment, to 290.74 UE min-1 g-1. In POF, the day 16 presented the value of 0.26 min-1 g-1 of dry mass-1. In 20 days the fruits of all treatments provided the highest values of POD during the experiment. The results showed that different doses of gamma radiation does not interfere with the activity of the enzymes determined in this experiment.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Pós-graduação em Matematica Aplicada e Computacional - FCT
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Pós-graduação em Matematica Aplicada e Computacional - FCT
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Herbert James Martin Loewe