DSpace Coleção: Artigo em periódico indexado (CPATC)

O trabalho temporario no projeto de fruticultura irrigada Plato de Neopolis, SE.

2001-01-01T00:00:00Z

Título: O trabalho temporario no projeto de fruticultura irrigada Plato de Neopolis, SE. Autoria: MOTA, D. M. da Conteúdo: O artigo analisa as "novas" condições de trabalho na agricultura irrigada, nas quais a relação empregado/empregador se dá por meio de contratos temporários, negociados face a face. A hipótese é que essa relação de trabalho tem gerado a intensificação da desregulamentação trabalhista e desafiado a ação política formal dos trabalhadores. Apóia-se em pesquisa documental-censitária e empírica realizada no período de dezembro/97 a março/2000, com a totalidade dos administradores dos 21 lotes em funcionamento do projeto de irrigação Platô de Neópolis, por meio da aplicação de questionários com perguntas fechadas e abertas, e entrevistas com 17 atores-chave. Os principais temas pesquisados foram: sistemas de produção, número de trabalhadores permanentes e temporários, tipos de ocupação, trajetórias individuais e salários. Três encontros entre os sindicatos e empresários para julgamento do dissídio coletivo/2000 na Delegacia Regional do Trabalho de Sergipe também foram objeto de observação. As principais conclusões mostram a generalização do emprego temporário desregulamentado, erguido sob redes de interconhecimento que reforçam o controle social dos trabalhadores.

Review of Sarcophagidae and Tachinidae (Diptera) parasitic flies associated to Mocis latipes (Guenée, 1852) (Lepidoptera: Erebidae), with novel parasitism records for Alagoas and Brazil.

2025-01-01T00:00:00Z

Título: Review of Sarcophagidae and Tachinidae (Diptera) parasitic flies associated to Mocis latipes (Guenée, 1852) (Lepidoptera: Erebidae), with novel parasitism records for Alagoas and Brazil. Autoria: GUZZO, E. C.; SPECHT, A.; SANTOS, J. C. F. dos; SILVA, P. de A.; TOMA, R. Conteúdo: Mocis latipes (Guenée, 1852) (Lepidoptera: Erebidae) is the main pest of graminaceous plants in the American Continent, especially in warm areas. Under normal conditions, M. latipes populations have their densities maintained at equilibrium by different natural enemies, including microorganisms (viruses, bacteria, and fungi), nematodes, insects, arachnids, birds, and mammals. In the megadiverse insect order Diptera, the families Tachinidae and Sarcophagidae are important natural enemies of various invertebrates, including pests, since several species parasitize insects and other arthropods. In the present work, we report the fly species Chetogena scutellaris (Wulp, 1890) (Tachinidae: Exoristinae: Exoristini); Atacta brasiliensis Schiner, 1868 (Tachinidae: Exoristinae: Goniini); and Peckia (Sarcodexia) lambens (Wiedemann, 1830) (Sarcophagidae: Sarcophaginae) parasitizing caterpillars of M. latipes collected on pasture, in Alagoas state, Northeast Brazil. This is the first record of C. scutellaris parasitizing M. latipes in Alagoas, the first report of the occurrence of P. (S.) lambens in Alagoas, and the first report of P. (S.) lambens parasitizing M. latipes in Brazil. Additionally, we reviewed the records of Tachinidae and Sarcophagidae parasitizing M. latipes, as well as all other hosts reported for them, and discussed the importance of parasitic flies for natural biological control of this and other lepidopteran pests in agrosystems, based on the distribution and host specificity of parasitic flies reported so far.

Acute toxicity and hematological effects of a silver nanoparticle–Terminalia catappa nanocomposite in juvenile tambaqui (Colossoma macropomum).

2025-01-01T00:00:00Z

Título: Acute toxicity and hematological effects of a silver nanoparticle–Terminalia catappa nanocomposite in juvenile tambaqui (Colossoma macropomum). Autoria: MENESES, J. O.; CUNHA, F. dos S.; DIAS, J. A. R.; SOUSA, N. da C.; COUTO, M. V. S. do; ABE, H. A.; CUNHA, A. F. S. dA; CARDOSO, J. C.; COSTA, L. P. da; ALVES, L. L.; PAIXÃO, P. E. G.; FUJIMOTO, R. Y. Conteúdo: Nanoparticles have been applied across various sectors of industry and agriculture. However, concerns regarding environmental contamination and toxicity to target and non-target organisms are increasing. The combination of plant extracts with nanoparticles may enhance their intended effects while reducing overall toxicity. Despite this potential, notudies have evaluated the toxicity of a nanocomposite based on plant extract and silver nanoparticles (Ag Np) on the survival and hematological parameters of tambaqui (Colossoma macropomum). This study assessed the acute toxicity and hematological effects of a nanocomposite based on Terminalia catappa extract and Ag Np in tambaqui. Fish (3–5 g) were exposed to five concentrations of the nanocomposite (0.11, 0.22, 0.45, 0.87, and 1.73 mgL−1) in triplicate for 96 h. Moribund fish during exposure period and all survivors at the end of the experiment were subjected to hematological analysis. Mortality data were used to estimate the lethal concentration 50 (LC50) via the parametric probit method. Hematological data were analyzed using ANOVA and Tukey’s test. The nanocomposite exhibited an LC50 of 0.61 mgL−1, classifying it as a highly toxic for tambaqui. All fish exposed to 1.73 mgL−1 died within 2 h. Increases in glucose, plasma proteins, erythrocytes, hemoglobin, MCHC, and additionally, lymphocytopenia, neutrophilia, and monocytosis were observed at 0.87 mgL−1, reflecting a stress and acute respiratory toxicity. However, at lower concentrations (<0.45 mgL−1) no alterations were observed in hematological and biochemical parameters. In conclusion, the nanocomposite induces hematological altera- tions consistent with acute stress in high concentrations, nonetheless 0.45 mgL−1 is a critical threshold for fish survival.

Effects of an Enterococcus faecium‐based probiotic on growth performance and resistance of Amazon ornamental fish Heros severus under short-term fasting.

2025-01-01T00:00:00Z

Título: Effects of an Enterococcus faecium‐based probiotic on growth performance and resistance of Amazon ornamental fish Heros severus under short-term fasting. Autoria: COSTA JUNIOR, K. S.; BARROS, F. A. L.; COUTO, M. V. S. do; REIS, R. G. A.; MARQUES, M. H. C.; FUJIMOTO, R. Y.; CORDEIRO, C. A. M.; SOUSA, N. da C. Conteúdo: This study aimed to evaluate the deprivation and feeding frequency of H. severus fingerlings fed a diet supplemented with autochthonous probiotic E. faecium and challenged with the pathogen A. hydrophila. The experiment was carried out in 2 × 5 factorial, consisting of two food frequencies (two and four times a day) and four food deprivations with probiotic (P:7/0, P:6/1, P:5/2 and P:Alt) and one control (C:7/0). The deprivation factor, higher values of growth parameters were observed for fish from the treatments P:7/0 and P:6/1, as well greatest resistance of the A. hydrophila. Therefore, the use of probiotic E. faecium provided greater growth and resistance for H. severus. Este estudo teve como objetivo avaliar a privação e a frequência alimentar de alevinos de H. severus alimentados com dieta suplementada com probiótico autóctone E. faecium e desafiados com o patógeno A. hydrophila. O experimento foi realizado em fatorial 2 × 5, sendo constituído por duas frequências alimentares (duas e quatro vezes ao dia) e quatro privações alimentares com probiótico (P:7/0, P:6/1, P:5/2 e P:Alt) e um controle (C:7/0). No fator privação, maiores valores dos parâmetros de crescimento foram observados para os peixes dos tratamentos P:7/0 e P:6/1, bem como maior resistência a A. hydrophila. Portanto, o uso do probiótico E. faecium proporcionou maior crescimento e resistência para H. severus.