http://repositorio.ufc.br/handle/riufc/41 Fri, 17 Apr 2026 12:22:05 GMT 2026-04-17T12:22:05Z https://repositorio.ufc.br:443/retrieve/eeb91e64-3532-460e-ba77-240b3f8ffde1/Comunidade_CCA-RI-moldurado.jpg http://repositorio.ufc.br/handle/riufc/41 http://repositorio.ufc.br/handle/riufc/85905 Título: Efeitos do fenômeno El Niño sobre o desempenho do agronegócio brasileiro: uma análise a partir do índice IboAgro Autor(es): Brasil Sobrinho, Carlos Alberto Abstract: This study analyzes the effects of El Niño characteristics on the economic and financial performance of Brazilian agribusiness from 1968 to 2024, through the construction and application of a specific sectoral index called IboAgro. The central objective is to evaluate, in an integrated way, how global climate shocks associated with El Niño and regional variations in specialization are related to the financial dynamics of the main agribusiness companies specific to the Brazilian stock exchange. To this end, the work proposes the calculation of IboAgro based on the IBOVESPA methodology, adapted to exclusively reflect the behavior of companies in the agricultural, livestock, and agro-industrial segments, with consistent inclusion and permanence criteria, ensuring greater stability and sectoral representativeness over time. The empirical approach adopts a quantitative econometric strategy, using models with errors consistent with heteroscedasticity and autocorrelation, as well as dynamic analytical arrangements that incorporate the Oceanic Niño Index (ONI) as a measure of the intensity of the El Niño phenomenon and variations in average annual variations by Brazilian macro-region as channels of climate transmission. Furthermore, climatic asymmetries between El Niño and La Niña episodes are explored, as well as procedures for reducing multicollinearity through Principal Component Analysis. The results indicate that positive shocks associated with El Niño exert contemporaneous and persistent negative impacts on the performance of the IboAgro index, highlighting the sector's high climate sensitivity. Furthermore, a relevant asymmetry in climatic effects is observed, with more intense impacts during El Niño episodes compared to shocks of the opposite sign. Regional rainfall, especially in the Northeast and Southeast regions, reveals itself as a central channel for the transmission of these shocks, being associated with statistically significant reductions in the aggregate performance of Brazilian agribusiness. This evidence is consistent with national and international literature, which highlights the vulnerability of the agricultural sector to extreme climatic events and the intensification of hydrological variability. It is concluded that the IboAgro constitutes a consistent and adequate analytical instrument for monitoring the response of Brazilian agribusiness to climate shocks, offering relevant support for risk management, the formulation of public policies, and the strategic planning of companies in the face of the challenges posed by climate change. Tipo: Dissertação Wed, 01 Apr 2026 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/85905 2026-04-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/85889 Título: Busca ativa/monitoramento da frequência diária do estudante: avaliação da política educacional pós crise de pandemia - Covid-19 Autor(es): Martins, Karla Bianca de Souza Tipo: Dissertação Wed, 01 Jan 2025 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/85889 2025-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/85872 Título: Potencial de uso da semente de Flamboyant-Mirim (Caesalpinia pulcherrima (L) Sw) como ingrediente funcional em pães Autor(es): Sousa, Poliana Brito de Abstract: Flamboyant-mirim seeds are a source of protein, lipids, and other nutrients, such as minerals and vitamins, and can be used as an ingredient to enrich the nutritional value of baked goods. Therefore, the objective of this research was to characterize flamboyant-mirim seed flour (FSF) and evaluate the effect of adding its flour and gel (GSF) in the production of loaf bread. Initially, the FSF was fractionated by granulometric sieving (0.710 mm, 0.500 mm, 0.355 mm, and 0.250 mm) and subjected to chemical, technological, functional, microstructural, and toxicity analyses. A 0.250 mm fraction showed high levels of ash, lipids, protein, fiber, minerals (Ca, Mg, P, K, Fe, Mn, and Zn), and better functional performance, including greater water solubility, oil absorption capacity, and emulsifying properties. Analyses indicated heterogeneous morphology, similar crystalline patterns among the samples, and absence of toxicity. Compounds such as amino acids, sugars, and unsaturated fatty acids were also identified. In the second stage, loaf-type breads were made with different concentrations of FSF (3.96–11.04%) and GSF (0.17–5.82%), using a central composite rotatable design. Dependent variations included technological, physicochemical, nutritional, and functional parameters. The inclusion of FSF and GSF in the loaf-type breads increased the levels of protein, lipids, ash, fiber, minerals, phenolic compounds, and antioxidant activity. Improvements were also observed in technological constraints, such as specific volume, alveolar structure, and color characteristics. Conversely, there was a reduction in moisture, acidity, density, and luminosity of the crumb. It is concluded that formulations containing 11.035% FSF and 3% GSF, 10% FSF and 5% GSF, and 10% FSF and 1% GSF provide benefits with greater nutritional value, improved technological properties, and high functional potential, representing promising alternatives for the development of baked goods with clean label appeal and natural enrichment. Tipo: Tese Thu, 01 Jan 2026 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/85872 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/85870 Título: Análise filogenética de isolados de Fusarium spp. agentes etiológicos da podridão da coroa em banana no Brasil Autor(es): Araujo, Leticia Rejane Lima Abstract: Banana (Musa spp.) belongs to the order Zingiberales, family Musaceae, and genus Musa. Originating from Southeast Asia and the Western Pacific, it has been introduced and widely cultivated in various regions of the world. Currently, it is the most produced fruit globally and the second most consumed, with Brazil ranking as the sixth largest producer. In Brazil, production reached approximately 6.9 million tons in 2024, with a strong emphasis on domestic consumption.Despite its economic importance, banana production faces challenges due to postharvest diseases, which affect fruit quality and lead to economic losses. Crown rot has been identified as one of the main diseases, caused by a complex of fungi, particularly Colletotrichum spp., Lasiodiplodia spp., Verticillium spp., and especially Fusarium spp. The disease typically manifests after fruit ripening, compromising its marketability. Therefore, the objective of this study was to perform molecular, morphological, and pathogenic characterization of Fusarium spp. isolates obtained from different banana cultivars in Brazil. A total of 40 Fusarium spp. isolates were collected from asymptomatic banana hands in 10 municipalities across the states of Ceará, Goiás, and Rio Grande do Norte, Brazil. These isolates were georeferenced and obtained from the cultivars Prata, Nanica, and Grand Naine. The isolates were subjected to morphological analysis, molecular characterization (using TEF1 and RPB2 genes), and pathogenicity tests. Phylogenetic analysis revealed significant species diversity within the following complexes: Fusarium fujikuroi Species Complex (FFSC), Fusarium incarnatum-equiseti Species Complex (FIESC), and Fusarium oxysporum Species Complex (FOSC). Within the FFSC, Fusarium musae was the most prevalent species; within the FIESC, Fusarium sulawesiense and Fusarium pernambucanum were prominent. In the FOSC, Fusarium triseptatum and Fusarium fabacearum were identified. Pathogenicity tests demonstrated that all isolates were capable of causing disease symptoms, with F. triseptatum (FOSC) being the most aggressive. These results highlight the complexity of banana crown rot, with multiple Fusarium species contributing to the disease. Tipo: Dissertação Wed, 01 Jan 2025 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/85870 2025-01-01T00:00:00Z