DSpace Coleção: Artigo em periódico indexado (CNPAT)

Silvicultura no Semiárido brasileiro: crescimento e produtividade de espécies florestais sob diferentes regimes de irrigação.

2026-08-12T13:46:37Z

Título: Silvicultura no Semiárido brasileiro: crescimento e produtividade de espécies florestais sob diferentes regimes de irrigação. Autoria: SILVA, A. K. V. da; COUTO, M. E. C. dos S.; SOUSA, J. A. de; CORREIA, D.; SANTOS, A. M.; ALVES, A. R.; RODOLFO JUNIOR, F.; RUSCH, F.; SCATOLINO, M. V.; MASCARENHAS, A. R. P.; PIMENTA, A. S.; MELO, R. R. de Conteúdo: É possível desenvolver a silvicultura no semiárido brasileiro? Essa foi a questão que motivou esta pesquisa. A demanda global por madeira intensificou-se nas últimas décadas. Portanto, é necessário atender às demandas regionais e estimular o aumento da produtividade dos plantios florestais em regiões onde a silvicultura ainda não está consolidada. Este estudo avaliou a produtividade de espécies florestais nativas e exóticas, e de clones de Eucalyptus, sob diferentes regimes de irrigação no Semiárido brasileiro. O estudo foi conduzido em um plantio experimental na região semiárida do Estado do Ceará, entre 2011 e 2021. Em um plantio que inicialmente apresentava 38 espécies, entre nativas e exóticas, além de 7 clones de Eucalyptus, todos submetidos a dois regimes de irrigação distintos (irrigados por até 12 meses e por até 36 meses), foram selecionadas quatro espécies nativas, cinco espécies exóticas e cinco clones com potencial silvicultural para implantação na região. Os indivíduos deste grupo foram avaliados cerca de 11 anos após o plantio. Durante o período de análise, foram contabilizadas as mortalidades e obtidas as variáveis dendrométricas: altura total e altura comercial, diâmetro à altura do peito, áreas transversal e basal, volume do fuste, volume total, fator de forma e aumento médio anual no volume de madeira produzido. Concluiu-se que o cultivo comercial de espécies florestais na região semiárida brasileira é possível, desde que sejam selecionadas espécies adaptadas às condições edafoclimáticas locais. Estes resultados podem impulsionar o desenvolvimento da silvicultura na região semiárida do Nordeste brasileiro.

Optimization of kombucha fermentation from green tea and pineapple juice: chemical, physicochemical, and bioactive profiles for functional beverage development.

2026-08-09T12:46:56Z

Título: Optimization of kombucha fermentation from green tea and pineapple juice: chemical, physicochemical, and bioactive profiles for functional beverage development. Autoria: GABAN, S. V. F.; NOGUEIRA, S. S. Q.; MARQUES, F. M. M.; PORRO, C.; ALVES FILHO, E. G.; SILVA, L. M. A. e; CANUTO, K. M. Conteúdo: This study evaluated the metabolic evolution and functional quality of green tea-based kombucha and pineapple juice-based kombucha fermented with the same symbiotic culture of bacteria and yeasts. Beverages were monitored over 0, 3, 5, and 7 days of fermentation using nuclear magnetic resonance spectroscopy alongside complementary physicochemical and color analyses to elucidate changes in organic acids, amino acids, and phenolic compounds. Both beverages showed progressive pH reduction to approximately 3.4, increased titratable acidity, and lightning of color (increased L, decreased a and b*) over time. Sucrose content decreased progressively in both systems, accompanied by ethanol production followed by oxidation to acetic, gluconic, and succinic acids, which increased significantly (p < 0.05). Pineapple juice-based kombucha exhibited higher total acid production and faster acidification, while green tea kombucha maintained greater stability in malic and citric acids. Among nitrogenous and phenolic compounds, epicatechin gallate (ECG) and epigallocatechin-3-gallate (EGCG) peaked at day 5 before declining due to oxidative degradation; theanine and alanine showed transient increases, indicating microbial synthesis and assimilation. Caffeine remained relatively stable throughout fermentation. Antioxidant activity measured by the ABTS assay revealed significantly higher radical scavenging capacity in green tea kombucha (10.36 μmol TE/g at day 0 to 10.33 μmol TE/g at day 7) compared to pineapple kombucha (1.90 μmol TE/g to 3.00 μmol TE/g over the same period). Overall, day 5 was identified as the optimal fermentation point, balancing acid production, pH reduction, and preservation of bioactive compounds, supporting the development of functional kombucha beverages from both tea and fruit matrices.

Metabolomics-driven identification of resistance biomarkers in dwarf cashew (Anacardium occidentale L.) under black mold stress.

2026-08-09T12:47:05Z

Título: Metabolomics-driven identification of resistance biomarkers in dwarf cashew (Anacardium occidentale L.) under black mold stress. Autoria: CRUZ, J. G. da; GUEDES, J. A. C.; SILVA, G. S. da; SILVA, L. M. A. e; RIBEIRO, P. R. V.; MARTINS, M. V. V.; SOUSA, D. B. de; CASSAGO, A. L. L.; ZOCOLO, G. J. Conteúdo: This study employed an integrated untargeted metabolomics approach to identify resistanceassociated biomarkers in dwarf cashew (Anacardium occidentale L.) genotypes under black mold stress-a severe foliar disease caused by Pilgeriella anacardii Arx & Müller. Metabolomic profiling was performed using ultra-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UPLC-QTOF-MSE) and nuclear magnetic resonance (NMR) spectroscopy. This methodology enabled a comprehensive analysis of four dwarf cashew genotypes with varying resistance to P. anacardii: ‘CCP 76’ and ‘BRS 189’ were susceptible, ‘BRS 226’ was intermediate, and ‘BRS 265’ was resistant. Orthogonal partial least squares discriminant analysis (OPLS-DA) revealed clear metabolic segregation between resistant, susceptible, and intermediate genotypes, with high predictive power (R2 Y ≥ 0.98; Q2 ≥ 0.95). Resistant clones (BRS 265 and BRS 226) showed pronounced metabolic reprogramming, marked by increased accumulation of flavonoid glycosides (quercetin-3-D-glucoside, isoquercetin), flavan-3-ols ((+)-catechin, gallocatechin), galloylated glucose derivatives (penta- and tetra-O-galloyl-glucosides), and biflavonoids (amentoflavone, agathisflavone). These compounds function as antioxidants, membrane disruptors, metal chelators, enzyme inhibitors, and immune response modulators. Pathway enrichment analysis highlighted the activation of flavonoid and flavonol biosynthesis as central to resistance. Elevated sucrose levels in resistant genotypes suggest a role in energy supply and systemic signaling. Altogether, this metabolomic fingerprint supports a complex biochemical defense strategy and offers robust biomarkers for marker-assisted selection.

Ocimum micranthum essential oil as a sustainable phytotherapeutic alternative against Haemonchus contortus.

2026-08-08T15:02:45Z

Título: Ocimum micranthum essential oil as a sustainable phytotherapeutic alternative against Haemonchus contortus. Autoria: BRAGA, A. P.; BARBOSA, M. L. F.; OLIVEIRA, R. F.; FERREIRA, K. V. M. M.; CARDOSO, S. S. da S.; SOUZA, R. de A.; PEREIRA, R. de C. A.; LOPES, F. F. da S.; FROTA, G. A.; MORAIS, S. M. de; ROCHA, L. O. da; RIBEIRO, W. L. C.; OLIVEIRA, L. M. B. de Conteúdo: This study is the first to evaluate the anthelmintic activity of Ocimum micranthum essential oil against Haemonchus contortus. The oil was chemically characterized using gas chromatography–mass spectrometry. Anthelmintic activity was assessed using the egg hatching test (EHT), larval development test (LDT), larval migration inhibition test (LMIT), and adult worm motility test (AWMT) against a multidrug-resistant H. contortus isolate. Following AWMT, oil-induced morphological and ultrastructural alterations were investigated using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Eugenol was the major oil component (78.44%). The oil exhibited anthelmintic activity in all assays, with EC50 values of 0.19 (EHT), 0.031 (LDT), 0.63 (LMIT) and 0.046 (AWMT) mg/mL. At 0.25 mg/mL, complete inhibition of adult motility was observed at the first evaluation time point (3 h post-exposure). SEM revealed damage to the cuticle, buccal capsule, and vulvar flap, whereas TEM demonstrated alterations in internal tissues. Ocimum micranthum essential oil was effective against H. contortus eggs, larvae, and adults. Therefore, further studies evaluating its toxicological safety and efficacy in small ruminants are required to validate its potential as an anthelmintic.