VALTER ARTHUR

(Fonte: Lattes)
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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)

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Data final: 2023 × Data inicial: 2020 × search.filters.applied.f.ispartof: Applied Veterinary Research ×

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    Artigo IPEN-doc 29493
    Histological evaluation of Rhipicephalus (Boophilus) microplus tick ovaries subjected to cobalt-60 ionizing radiation
    2022 - PASQUALINI, ALEXANDRE A.; ARTHUR, VALTER; SCHIAVOLIN, MICHELEN B.; ABREU, MARINA R. de; CAMARGO-MATHIAS, MARIA I.
    Females of Rhipicephalus (Boophilus) microplus ticks ingurgitated and in the prepost phase were submitted to doses of 0, 5, 10, 15, 20 and 25 Gy of Cobalt-60 with the aim of evaluating their effects on ovarian morphohistology with consequent establishment of the degree of damage caused to the reproductive organs of this species. For this purpose, 24 hours after exposure to Co-60 (142 Gy/h) the ectoparasites were dissected and had their ovaries removed and prepared for histology with haematoxylin and eosin staining. The results obtained showed that the 5 Gy dose radiation had a morphological aspect similar to the control standard adopted. The histological sections related to doses of 10 and 15 Gy did not cause many changes in the ovaries, except that changes were observed in the calf granules (size, distribution and staining pattern), as well as the extensive presence of cytoplasmic vacuoles in the ovocytes, especially in the region that makes contact with the ovocyte/pedicel, suggesting the occurrence of changes also in the physiology of the organ. In the ovaries exposed to doses of 20 and 25 Gy, severe alterations were observed in the organ as a whole, as well as in the germ cells (oocytes) which suffered alterations in size and shape, distribution of calf granules, involvement of the DNA present in the germinal vesicle (oocyte nuclei), besides the extensive cytoplasmic vacuolization, alterations which made the maturation of these cells impossible and consequently inhibited the production of new individuals.
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    Artigo IPEN-doc 29492
    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.