https://www.alice.cnptia.embrapa.br/alice/handle/item/22 Embrapa Meio Ambiente (CNPMA) Fri, 12 Jun 2026 04:57:11 GMT 2026-06-12T04:57:11Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1187389 Título: Efeitos da suplementação com artemisia annua no estresse oxidativo e capacidade antioxidante hepático da tilápia-do-nilo (Oreochromis niloticus) vacinada e infectada com Streptococcus agalactiae. Autoria: BRITO, H. P. de; ANAGUANO, N. C. C.; PAULA, J. H. da C. de; CARVALHO, L. B. de; SOARES, M. A. M.; LONGHINI, W. E.; PERES, M. A. B.; LEITE, C. A. C.; FERNANDES, M. N.; SAMPAIO, F. G.; SOARES, M. P. Conteúdo: Resumo: A intensificação da piscicultura no Brasil amplia os desafios sanitários, exigindo alternativas seguras para o consumidor e o ambiente. Nesse contexto, bioinsumos à base de compostos bioativos de plantas vêm sendo estudados por seu potencial imunoestimulante. O extrato de Artemisia annua (e-Aa) destaca-se pela ação antioxidante e pela capacidade de fortalecer a saúde e a resistência dos peixes. A vacinação é uma medida profilática essencial, mas pode gerar estresse e mortalidade. Assim, este estudo avalia se a suplementação com e-Aa, associada à vacinação, potencializa a imunidade de juvenis de Oreochromis niloticus, reduzindo perdas durante o estresse vacinal e desafios bacterianos. Wed, 01 Jan 2025 00:00:00 GMT https://www.alice.cnptia.embrapa.br/alice/handle/doc/1187389 2025-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1187404 Título: Efeito do fitobiótico Artemisia annua e antibiótico enrofloxacina no estresse oxidativo hepático e qualidade da água após transporte de juvenis de tilápia-do-nilo. Autoria: ANAGUANO, N. C. C.; BRITO, H. P. de; CARVALHO, L. B. de; SOARES, M. A. M.; MARASCHI, A. C.; SAMPAIO, F. G.; CAMPOS, C. M. de; FERNANDES, M. N.; LEITE, C. A. C.; SOARES, M. P. Conteúdo: Resumo: O transporte intensifica o estresse em peixes cultivados, comprometendo homeostase. Antibióticos são utilizados, mas apresentam riscos relacionados à resistência bacteriana e resíduos. Extratos vegetais, como Artemisia annua, despontam como alternativas promissoras para mitigar tais efeitos. O presente estudo avaliou o efeito do extrato de Artemisia annua (e-Aa) e do antibiótico enrofloxacina (ENR) na água de transporte de peixes vivos. Wed, 01 Jan 2025 00:00:00 GMT https://www.alice.cnptia.embrapa.br/alice/handle/doc/1187404 2025-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186756 Título: Temporal optimization of UAV-based pasture monitoring using multi-year NDVI and precipitation data in Lagoinha/SP, Brazil. Autoria: NOGUEIRA, S. F.; SANTOS, T. T.; BAYMA, G.; SANTOS, P. M.; SANO, E. E.; BOLFE, E. L. Conteúdo: This study identifies the optimal period for using unmanned aerial vehicle (UAV) imagery to assess pasture conditions in the municipality of Lagoinha, São Paulo State, Brazil. It combines long-term precipitation data (1948‒2024) and NDVI time series derived from Sentinel-2 satellite (2017‒2024) for 15 partner properties of the Science Center for the Development of Digital Agriculture - Semear Digital. The results show that the transition from rainy to dry season, especially in May and June, provides the best pasture contrast conditions for UAV monitoring. During this time, intermediate NDVI values (0.45‒0.55) enhance the differences between well-managed and degraded pastures, while lower precipitation and cloud cover conditions improve the radiometric quality of images. Farms with higher technology adoption show more stable NDVI profiles, facilitating the vegetation condition detection. This study provides a framework for planning UAV-based pastureland assessments to support better pastureland monitoring and management decisions. Wed, 01 Jan 2025 00:00:00 GMT https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186756 2025-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186510 Título: Modulated UV-C radiation as an innovative strategy for postharvest disease control and quality preservation in papaya and orange fruits. Autoria: SILVA, A. M. da; TERAO, D.; SILVA, I. S. O.; MAIA, A. de H. N.; MELO, W. L. de B.; NECHET, K. de L.; HALFELD-VIEIRA, B. de A.; VILELA, E. S. D.; FRACAROLLI, J. A. Conteúdo: Abstract: Postharvest losses remain a major challenge in fruit production systems, affecting both climacteric fruits, such as papaya, and non-climacteric fruits, such as orange. Ultraviolet-C (UV-C) radiation has emerged as a sustainable alternative to chemical fungicides; however, its effectiveness depends on the applied dose and radiation delivery mode. This study investigated the comparative effects of continuous and frequency-modulated UV-C radiation on postharvest disease control and fruit quality on papaya and orange. Two independent experiments were conducted. Experiment 1 evaluated the influence of modulation frequencies (0, 15, 30, and 45 Hz) on disease progression, while Experiment 2 combined the most effective frequencies with different exposure times to define optimal treatment conditions. In papaya, UV-C modulation at 30 Hz/20 s (0.44 kJ m⁻²) provided effective control of anthracnose (67% reduction in incidence), while minimizing photothermal damage, with no visible epidermal injuries. In orange, continuous UV-C radiation (0 Hz) applied for 30 s (1.99 kJ m⁻²), completely suppressed sour rot development (100%) without visible peel injury. Therefore, the selection of the UV-C radiation application mode is species-specific. Notably, modulation of UV-C irradiation has demonstrated enhanced efficiency in postharvest disease control while reducing epidermal burn. Additionally, the treatments stimulated defense responses, as evidenced by increased activities of phenylalanine ammonia-lyase, polyphenoloxidase, peroxidase, and catalase. Physicochemical analyses confirmed the maintenance of firmness, acidity, and color stability, indicating the preservation of postharvest quality in both fruits. Overall, modulated UV-C radiation represents a promising non-chemical postharvest technology, enabling efficient disease control while maintaining fruit quality. Thu, 01 Jan 2026 00:00:00 GMT https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186510 2026-01-01T00:00:00Z