108 research outputs found
Tratamentos Alternativos No Controle Da Antracnose E Sobre A Qualidade De Goiabas ‘pedro Sato’
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)One of the major problems in guava commercialization is the incidence of postharvest diseases, which coincides with fruit ripening. The effect of alternative products [potassium phosphite, calcium chloride, cassava starch, 1-methylcyclopropene (1-MCP), ethanol followed by sodium dichloro s. triazinetrione dehydrate (ethanol+chlorine)] and hydrothermal treatment, singly and in association, was evaluated on anthracnose control and on the physicochemical characteristics of ‘Pedro Sato’ guava. Treatments were applied to naturally infected guavas, in three maturity stages, which were stored at 22 or 25ºC for eight days. The incidence of anthracnose was evaluated by visual observation of symptoms and signs of the pathogens under an optical microscope, and the evaluated physicochemical parameters were skin color, pulp firmness, fresh mass loss, soluble solids, titratable acidity and ascorbic acid. The association of treatments ethanol+chlorine/cassava starch, hydrothermal treatment/cassava starch and ethanol+chlorine/1-MCP reduced the incidence of anthracnose in all three maturity stages in at least one storage period, leading to longer shelf life of fruits and a delay of two to four days in the onset of the disease. The maintenance of guava quality by means of treatment association was evidenced by delayed change in the skin color and less reduction in pulp firmness, especially for ethanol+chlorine/1-MCP. There was a positive correlation between the incidence of anthracnose and the maturity stage, expressed by the fruit skin color. The higher efficiency of treatment association in controlling anthracnose was directly related to the delay in fruit ripening, evidenced by the parameters skin color and pulp firmness. © 2016, Universidade Estadual Paulista (UNESP). All rights reserved.4243233392012/07207-7, FAPESP, Fundação de Amparo à Pesquisa do Estado de São PauloFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP
Elaboração e validação de escala diagramática para quantificação da severidade de entomosporiose em folhas de pereira
Interferência da redução no volume de aplicação sobre o controle da mancha preta (Guignardia citricarpa Kiely) em frutos de laranja 'Valência'
Beneficiamento pós-colheita de lima ácida 'Tahiti' afeta sua qualidade e conservação
Glassy dynamics in thin films of polystyrene
Glassy dynamics was investigated for thin films of atactic polystyrene by
complex electric capacitance measurements using dielectric relaxation
spectroscopy. During the isothermal aging process the real part of the electric
capacitance increased with time, whereas the imaginary part decreased with
time. It follows that the aging time dependences of real and imaginary parts of
the electric capacitance were primarily associated with change in volume (film
thickness) and dielectric permittivity, respectively. Further, dielectric
permittivity showed memory and rejuvenation effects in a similar manner to
those observed for poly(methyl methacrylate) thin films. On the other hand,
volume did not show a strong rejuvenation effect.Comment: 7 pages, 7 figures. Phys. Rev. E (in press
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