VALTER ARTHUR

VALTER ARTHUR

(Fonte: Lattes)

Resumo

Possui graduação em Biologia pela Universidade Metodista de Piracicaba (1977), mestrado em Energia Nuclear na Agricultura (Esalq) Universidade de São Paulo (1982) e doutorado em Agronomia (Entomologia) (Esalq) Universidade de São Paulo (1985). Atualmente é professor Associado no Centro de Energia Nuclear na Agricultura da Universidade de São Paulo. Tem experiência na área de Agronomia, com ênfase em Radioentomologia (tratamento quarentenário de pragas de importância agrícola) e Irradiação de alimentos (conservação e desinfecção de produtos agropecuários). (Texto extraído do Currículo Lattes em 27 dez. 2021)

Página do item completo

Resultados de Busca

Agora exibindo 1 - 7 de 7

Animal welfare provisions in cattery
2022 - ARTHUR, PAULA B.; LEANDRO, RODRIGO S.R.; HARDER, MARCIA N.C.; ARTHUR, VALTER
The present study had the objective of proposing adaptations for a permanent housing environment for neutered cats. Priorities and management practices were characterized by better animals health and quality of life. An animal observation survey was carried out on two different types of catteries: A, where the animals had an environment with greater freedom of movement, and cattery B, with animals with a reduced environment. The problems encountered in each were observed, such as sanitary, nutritional, and especially environmental management. Behavior was taken into account, according to the environment experienced by domestic cats castrated in confinement in the two different types of catteries. Based on the frequency and behavioral sequence of the groups analyzed, it was concluded that the environment of the cattery A promoted greater well-being of the animals.
Effects of gamma radiation in okra’s conservation
2021 - ARTHUR, PAULA B.; LEANDRO, RODRIGO S.R.; HARDER, LARISSA N.C.; HARDER, MARCIA N.C.; ARTHUR, VALTER
Okra is a very important vegetable in simple world cuisine. The aim of this work was to evaluate the effects of gamma radiation of Cobalt-60 in the conservation of okra (Abelmoschus esculentus). After 1 day of okras’s harvest, they were selected based in the size, presence of mechanical and phytophatologycal damages, and put in polystyrene trays and covered with thin polyethylene film. Then they were irradiated with doses of: 0 (control); 75; 100; 125; 150 and 200 Gy, at a dose rate of 0.259 kGy/h. The experiment was carried out in chamber regulated at 10o C of temperature and 80% of relative humidity. All analyses physical and chemical of the samples were carried out after 7 and 15 days of the storage. The results did not show any significative difference between the control and irradiated samples, except the viscosity that decreased with the increase of the dose of radiation. The dose of 75 Gy can be indicated to the conservation of okras because it was the one that showed best result in the coloration of okras.
Gamma radiation effects in precooked figs
2021 - HARDER, M.N.C.; HARDER, L.N.C.; LEANDRO, R.S.R.; ARTHUR, P.B.; ARTHUR, V.
Gamma radiation effects in jatoba flour
2021 - HARDER, M.N.C.; HARDER, L.N.C.; LEANDRO, R.S.R.; ARTHUR, P.B.; ARTHUR, V
Propagation of mango seedlings of the cultivar "Tommy" by grafts irradiated
2021 - FRANCO, S.S.H.; FRANCO, J.G.; FERRARI, L.; LEANDRO, R.S.R.; ARTHUR, P.B.; ARTHUR, V.
Due to difficulties of vegetative propagating of any pants, many tests were performed with ionizing radiation aiming the modification of the characteristics of the plants for obtaining of the improved genotypes and of smaller size. Rootstock “Espada” cultivar, were used to obtain mango seedlings of “Tommy” cultivar. The cuttings were irradiated with different gamma radiation doses: 0 (control), 2.5, 5.0, 7.5 and 10.0 Gy, a dose rate of 0.323 kGy/h, in a source of Cobalt-60 type Gammacell-220, installed in the Center for Nuclear Energy in Agriculture, CENA-USP. After irradiation, was performed the grafting type cleft graft. It was made the first evaluation of height of the plants from the budding grafting after 24 months. Data were subjected by statistic program (SAS) and the means were compared by Tukey test (p <0.05). From the results obtained can be concluded that the doses of 2.5 Gy stimulated growth of the plants and the lethal dose was 10.0 Gy because don’t have development of plants.
Sterilizing of Alphitobius diaperinus (Panzer, 1797) (Coleoptera: Tenebrionidae) irradiated in pupa stage
2021 - ARTHUR, P.B.; VILLAVICENCIO, A.L.C.H.; HARDER, M.N.C.; MACHI, A.R.; LEANDRO, R.S.R.; ARTHUR, V.
The use of irradiation process in stored grain may be the solution for the losses caused in these products by insects, as it does not induce resistance in the insects and leaves no toxic residue, and is considered an efficient and safe method of control of insects. The aim of the experiment was to determine the sterilizing dose of ionizing radiation from cobalt-60 to Alphitobius diaperinus (Panzer, 1797) (Coleoptera: Tenebrionidae) in peanuts irradiated in pupa stage. The experiment was conducted in the laboratory of Radiobiology and Environment of the Center for Nuclear Energy in Agriculture - CENA / USP., Piracicaba, SP, Brazil. Peanuts samples infested with pupae of A. diaperinus were utilized in the experiment that consisted of 8 treatments with 5 repetitions. Each repetition consisted of 20 pupae a total of 100 individuals per treatment. Were irradiated with doses of 0 (control), 25, 50, 75, 100, 125, 150 and 175 Gy, in a source of cobalt-60, Gammacell-220 type, with a rate dose of 381Gy / h. The experiment was conducted in a controlled temperature of 25 ± 5 ° C and relative humidity of 70 ± 5%. After of irradiation process was evaluated of the number of emerged adult insects in each repetition in the treatments. The results showed that the sterilizing dose in F1 generation was 125 Gy and the pupa lethal dose 150 Gy. The dose of 150 Gy of gamma radiation can be used as phytosanitary treatment to control of immature stages of A. diaperinus infested peanuts.
Disinfestation of mangoes haden infested by Anastrepha fraterculus (Wied., 1830) (Diptera, Tephritidae) with gamma radiation
2021 - ARTHUR, P.B.; MACHI, A.R.; LEANDRO, R.S.R.; HARDER, L.N.C.; HARDER, M.N.C.; ARTHUR, V.
The objective of experiment was determinate the radiation dose for disinfestation to mango Mangifera indica cv. Haden, infested by Anastrepha fraterculus larvae. For realization of the experiment, were collected fruits in the field, which were taking to Entomology laboratory where there was an infestation by the flies in cages during 72 hours period. Waited for the development of the larvae 5 and 8 days to infestation, after the mangos were irradiated in a Cobalt-60 source with doses of: 0(control), 50, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1.100, 1.200 and 1.300 Gy. After the irradiation, the fruits were placed in climate chamber with 25 ±5°C of temperature and 70±5% of relative humidity. Waited the larvae exit to out of the fruit until the transformation in pupae and adult stage. By the results obtained we can concluded that the lethal dose to larvae in mangoes infested with 5 and 8 days were 600 Gy and 1.000 Gy (0.6 and 1 kGy) respectively. The dose of 50 Gy prevented the total adult emergence for both treatments.