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1.
Salicylic acid on gas exchange and growth of Hymenaea courbaril L. seedlings under flooding
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Santos, Cleberton C.
; Silva, Luis F. P. da
; Piesanti, Matheus
; Scalon, Silvana de P. Q.
; Goelzer, Ademir
; Silverio, Juliana M.
; Reis, Lucas C.
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Revista Brasileira de Engenharia Agrícola e Ambiental
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ABSTRACT Flooding is a stressful condition that causes damage to the photosynthetic apparatus, negatively affecting the growth of seedlings of fruit species, including Hymenaea courbaril L. Studies on physiological management, such as exogenous application of phytohormones, to alleviate abiotic stress have increased. The objective of this study was to evaluate the effect of foliar application of salicylic acid (SA) on H. courbaril seedlings subjected to flooding. The seedlings received foliar application of four concentrations of SA (0, 100, 200, and 400 mg L-1) and were subjected to two water regimes: a) control - non-flooded and irrigated daily and b) flooded - seedlings were placed in a plastic pool, keeping the water depth at ± 5.0 cm above the substrate level. After 35 days, we evaluated the gas exchange, initial growth, quality, and potential ecological resilience of the seedlings. All flooded seedlings survived, but had reduced photosynthesis, carboxylation of Rubisco efficiency, and water-use and stomatal conductance when they received 100-300 mg L-1 SA. The seedlings that received between 100 and 300 mg L-1 SA had greater growth, quality, and phenotypic plasticity. Foliar application of SA did not mitigated the effect of flooding on gas exchange but contributed to the growth of H. courbaril seedlings.
RESUMO O alagamento é um fator estressante e promove danos ao aparato fotossintético, afetando negativamente o crescimento de mudas de espécies frutíferas, dentre elas a jatobazeiro Estudos sobre o manejo fisiológico, tal como aplicação exógena de fitohormônio, para aliviar o estresse abiótico tem aumentado. Assim, objetivou-se com esse estudo avaliar o efeito da aplicação foliar de concentrações de ácido salicílico (AS) em mudas de H. courbaril submetidas ao alagamento. As mudas receberam aplicação via foliar de quatro concentrações de AS: 0, 100, 200 e 400 mg L-1, e submetidas a dois regimes hídricos: a) controle: - não alagadas e irrigadas diariamente e b) alagamento - acondicionamento das mudas em piscina com lâmina d’água (5.0 cm) acima do nível do substrato. Decorridos 35 dias avaliamos as trocas gasosas, crescimento inicial, qualidade e o potencial de resiliência ecológica das mudas. Observou-se que todas as mudas alagadas sobreviveram, mas tiveram redução da fotossíntese, eficiência instantânea de carboxilação da Rubisco e de uso da água e condutância estomática e quando receberam aplicação entre 100-300 mg L-1 de AS. As mudas que receberam aplicação das concentrações entre 100 e 300 mg L-1 de AS tiveram maiores características de crescimento, qualidade e plasticidade fenotípica. A aplicação foliar de ácido salicílico não mitigou o efeito do alagamento sobre as trocas gasosas, mas contribuiu no crescimento das mudas de H. courbaril.
2.
Use of hydrogen peroxide in acclimatization of melon to salinity of irrigation water
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Pereira, Francisco H. F.
; Santos, Gisele L. dos
; Lacerda, Francisco H. D. de
; Sousa, Diogenes D. A. de
; Sousa, Valéria F. de O.
; Fernandes, Joyce E. de M.
; Silva, Silvana F. da
; Barboza, Jonathan B.
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Revista Brasileira de Engenharia Agrícola e Ambiental
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RESUMO No semiárido do Nordeste brasileiro as condições edafoclimáticas podem favorecer riscos de salinização do solo, principalmente quando se utiliza água de má qualidade para irrigação. Nesse contexto, técnicas que possibilitem melhorias nos rendimentos da cultura do melão em condições adversas, como a salinidade, são, portanto, de grande relevância para o setor produtivo. Logo, o objetivo deste estudo foi avaliar a eficácia do peróxido de hidrogênio (H2O2) na aclimatação do meloeiro submetido a diferentes níveis salinos na água de irrigação. Os tratamentos consistiram de duas condutividades elétricas da água de irrigação (0,3 e 5,0 dS m-1) e quatro concentrações de H2O2 (0, 5, 10 e 15 µmol L-1). O delineamento experimental utilizado foi o de blocos casualizados, em esquema fatorial 2 × 4, com quatro repetições e quatro plantas por parcela. O aumento da salinidade da água de irrigação reduz o crescimento, as trocas gasosas e a produção do meloeiro. No entanto, o H2O2, na concentração de 6,35 µmol L-1 proporcionou melhorias na fisiologia, crescimento e produção, além de reduzir os efeitos deletérios do estresse salino na produção de melão.
ABSTRACT In the semi-arid region of northeastern Brazil, soil and climate conditions can increase the risk of soil salinization, particularly when poor-quality water is used for irrigation. Therefore, techniques that improve the yields of melon culture under adverse conditions, such as salinity, are of great relevance to the production sector. The objective of this study was to evaluate the effectiveness of hydrogen peroxide (H2O2) in acclimatizing melon trees subjected to irrigation water with different salinity levels. The treatments consisted of irrigation water with two electrical conductivities (0.3 and 5.0 dS m-1) and four concentrations of H2O2 (0, 5, 10, and 15 µmol L-1). The experimental design used was randomized blocks, arranged in a 2 × 4 factorial scheme, with four replicates and four plants per plot. Increase in salinity of irrigation water reduced the growth, gas exchange, and production of melon plants. However, H2O2, at a concentration of 6.35 µmol L-1, yielded improvements in physiology, growth, and production, in addition to reducing the deleterious effects of saline stress on melon production.
3.
Multidisciplinary Scientific Cruises for Environmental Characterization in the Santos Basin – Methods and Sampling Design
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Moreira, Daniel L.
; Dalto, Adriana G.
; Figueiredo JR, Alberto G.
; Valerio, Aline M.
; Detoni, Amalia M. S.
; Bonecker, Ana C. T.
; Signori, Camila N.
; Namiki, Cláudia
; Sasaki, Dalton K.
; Pupo, Daniel V.
; Silva, Danilo A.
; Kutner, Deborah S.
; Duque-Castaño, Diana C.
; Marcon, Eduardo H.
; Gallotta, Fabiana D. C.
; Paula, Fabiana S.
; Gallucci, Fabiane
; Roque, Gabriela C. F.
; Campos, Giulia S.
; Fonseca, Gustavo
; Mattos, Gustavo
; Lavrado, Helena P.
; Silveira, Ilson C. A. da
; Costa, Jessica O.
; Santos Filho, João R. dos
; Carneiro, Juliane C.
; Moreira, Julio C.F.
; Rozo, Laura
; Araujo, Leandro F.M.
; Lazzari, Letícia
; Silva, Letícia O. da
; Michelazzo, Luan S.
; Fernandes, Luciano F.
; Dottori, Marcelo
; Araújo Jr., Marcus A. G. de
; Chuqui, Mateus G.
; Ceccopieri, Milena
; Borges-Silva, Milton
; Kampel, Milton
; Bergo, Natascha M.
; Silva, Paulo V. M.
; Tura, Pedro M.
; Moura, Rafael B. de
; Romano, Renato G.
; Martins, Renato P.
; Carreira, Renato S.
; Toledo, Rodrigo G.A.
; Bonecker, Sérgio L.C.
; Disaró, Sibelle T.
; Rodrigues, Silvana V.
; Corbisier, Thais N.
; Vicente, Thaisa M.
; Paiva, Vitor G. de
; Pellizari, Vivian H.
; Belo, Wellington C.
; Brandini, Frederico P.
; Sousa, Silvia H.M
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Abstract The Santos Basin (SB) is the main petroliferous basin in the Brazilian continental margin and one of the most studied marine areas in Brazil. However, historical data suggest that new efforts should be carried out to acquire quantitative biological data, especially in the deep sea, to establish the baseline of essential ocean variables in different ecosystems for future monitoring programs. The Brazilian energy company Petrobras planned and executed 24 oceanographic cruises over a period of 2 years to assess the benthic (SANSED cruise) and pelagic (SANAGU cruise) systems of the SB (356 days at sea in 2019 and 2021/2022). These efforts were part of the Santos Project, which comprised a comprehensive environmental study aimed at investigating benthic and pelagic variables to characterize ecology, biogeochemistry, thermohaline properties of water masses, and ocean circulation patterns, geomorphology, and sedimentology, as well as organic and inorganic chemistry. Here we present the detailed sampling designs and the field methods employed on board, during the SB scientific cruises. All sampling protocols were based on standardized approaches. For the benthos analyses, triplicate sediment samples were performed using a GOMEX-type box corer (0.25 m²) or a large modified Van Veen grab (0.75 m²) at 100 stations ranging from 25 to 2400 m depth. At each station, 25 geochemical and physico-chemical parameters were analyzed in addition to micro-, meio-, and macrofauna and living foraminifera samples. For the pelagic system, 60 stations were selected to investigate the plankton community, ranging in size from pico- to macroplankton, through vertical, horizontal, and oblique net hauls (20, 200, and 500 μm mesh size), as well as 25 biogeochemical parameters collected with an aid of a CTD-rosette sampler. Part of this scientific information also serves the Regional Environmental Characterization Project (PCR-BS) in support of Petrobras’ Santos Basin drilling licensing process led by the Brazilian Environmental Agency – IBAMA. This project contributes to the sustainable development of the SB, in line with the guidelines of the United Nations Decade of Ocean Science for Sustainable Development.
4.
Agronomic performance of cowpea cultivars inoculated with rhizobia in the brazilian semiarid region
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Oliveira, Pedro R. H. de
; Lopes, Welder de A. R.
; Silveira, Flávio P. da M.
; Santos, Manoel G. dos
; Santos, Gisele L. dos
; Silva, Silvana F. da
; Silveira, Lindomar M. da
; Barros Júnior, Aurélio P.
.
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ABSTRACT This work aimed to evaluate the agronomic efficiency of cowpea cultivars inoculated with rhizobia strains recommended for cowpea in a semiarid environment. Experiments were carried out in Mossoró, Rio Grande do Norte, in two agricultural cycles: the first from January to April 2019, and the second from June to August of the same year. The experimental design adopted was randomized blocks with four replications arranged in a 4 × 4 x 2 factorial scheme, with treatments consisting of four cowpea cultivars: ‘BRS Imponente’, ‘BRS Itaim’, ‘BRS Novaera’, and ‘BRS Tumucumaque’ as well as three sources of N, two strains of Bradyrhizobium spp. registered for cowpea (BR 3262 and BR 3267) and, the application of mineral N (50 kg ha-1), beyond an absolute control, without inoculation or application of mineral N. In addition to two planting seasons. The cultivar ‘BRS Tumucumaque’ showed greater productive potential. The inoculation of cowpea seeds with Bradyrhizobium strains BR 3262 and BR 3267 provided grain yields similar to those obtained with the application of mineral N.
RESUMO Este trabalho teve como objetivo avaliar a eficiência agronômica de cultivares de feijão-caupi inoculadas com linhagens de rizóbios recomendadas para feijão-caupi em ambiente semiárido. Os experimentos foram conduzidos em Mossoró, Rio Grande do Norte, em duas safras agrícolas: o primeiro de janeiro a abril de 2019, e o segundo de junho a agosto do mesmo ano. O delineamento experimental adotado foi de blocos ao acaso com quatro repetições em esquema fatorial 4 × 4 x 2, com tratamentos constituídos por quatro cultivares de feijão-caupi: 'BRS Imponente', 'BRS Itaim', 'BRS Novaera' e 'BRS Tumucumaque' e três fontes de N, duas linhagens de Bradyrhizobium spp. registradas para o feijão-caupi (BR 3262 e BR 3267), aplicação de N mineral (50 kg ha-1), além de uma testemunha absoluta, sem inoculação ou aplicação de N mineral. Além de duas épocas de plantio. A cultivar 'BRS Tumucumaque' apresentou maior potencial produtivo. A inoculação de sementes de feijão-caupi com as linhagens de Bradyrhizobium BR 3262 e BR 3267 proporcionou rendimentos de grãos semelhantes aos obtidos com a aplicação de N mineral.
5.
Molecular Structure Studies on Allyl Sulfonamides: Synthesis, Theoretical Treatment and Evaluation of Biological Activity
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Rabello, Anderson S
; Rubinger, Mayura M. M
; Souza, Rafael A. C
; Guilardi, Silvana
; Lima, Guilherme F. de
; Tavares, Eder C
; Zanon, Édipo P
; Silva, Giovanna R. N
; Zambolim, Laércio
; Ellena, Javier
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Journal of the Brazilian Chemical Society
- Métricas do periódico
Two series of allyl sulfonamides, prepared from Morita-Baylis-Hillman adducts and primary aromatic sulfonamides, were fully characterized. The Z configuration for the products derived from 2-[hydroxy(phenyl)methyl]acrylonitrile (1) and E configuration for those derived from methyl 2-[hydroxy(phenyl)methyl]acrylate (2) were confirmed by X-ray diffraction for one compound of each series (1e, 2f). Density functional theory calculations for all allyl sulfonamides agreed with the X-ray crystallographic data. X-ray diffraction studies indicate that these compounds form dimers in their crystal structures. Fingerprint plots show that compound 1e is stabilized by H⋯H, C⋯H/H⋯C, O⋯H/H⋯O and N⋯H/H⋯N interactions, while the compound 2f has no N⋯H/H⋯N contacts. Hirshfeld surface analyses were performed to gain insight into the behavior of these interactions. Calculated frontier orbitals showed that their highest occupied and lowest unoccupied molecular orbitals are antibonding orbitals. The allyl sulfonamides 1e and 2f are among the most active compounds in each series, inhibiting approximately 60% of the mycelial growth of Botrytiscinerea at 3 mmol L-1.
https://doi.org/10.21577/0103-5053.20210094
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6.
Persistent symptoms and decreased health-related quality of life after symptomatic pediatric COVID-19: A prospective study in a Latin American tertiary hospital
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Fink, Thais T.
; Marques, Heloisa H.S.
; Gualano, Bruno
; Lindoso, Livia
; Bain, Vera
; Astley, Camilla
; Martins, Fernanda
; Matheus, Denise
; Matsuo, Olivia M.
; Suguita, Priscila
; Trindade, Vitor
; Paula, Camila S.Y.
; Farhat, Sylvia C.L.
; Palmeira, Patricia
; Leal, Gabriela N.
; Suzuki, Lisa
; Odone Filho, Vicente
; Carneiro-Sampaio, Magda
; Duarte, Alberto José S.
; Antonangelo, Leila
; Batisttella, Linamara R.
; Polanczyk, Guilherme V.
; Pereira, Rosa Maria R.
; Carvalho, Carlos Roberto R.
; Buchpiguel, Carlos A.
; Latronico, Ana Claudia
; Seelaender, Marilia
; Silva, Clovis Artur
; Pereira, Maria Fernanda B.
; Sallum, Adriana M. E.
; Brentani, Alexandra V. M.
; Neto, Álvaro José S.
; Ihara, Amanda
; Santos, Andrea R.
; Canton, Ana Pinheiro M.
; Watanabe, Andreia
; Santos, Angélica C. dos
; Pastorino, Antonio C.
; Franco, Bernadette D. G. M.
; Caruzo, Bruna
; Ceneviva, Carina
; Martins, Carolina C. M. F.
; Prado, Danilo
; Abellan, Deipara M.
; Benatti, Fabiana B.
; Smaria, Fabiana
; Gonçalves, Fernanda T.
; Penteado, Fernando D.
; Castro, Gabriela S. F. de
; Gonçalves, Guilherme S.
; Roschel, Hamilton
; Disi, Ilana R.
; Marques, Isabela G.
; Castro, Inar A.
; Buscatti, Izabel M.
; Faiad, Jaline Z.
; Fiamoncini, Jarlei
; Rodrigues, Joaquim C.
; Carneiro, Jorge D. A.
; Paz, Jose A.
; Ferreira, Juliana C.
; Ferreira, Juliana C. O.
; Silva, Katia R.
; Bastos, Karina L. M.
; Kozu, Katia
; Cristofani, Lilian M.
; Souza, Lucas V. B.
; Campos, Lucia M. A.
; Silva Filho, Luiz Vicente R. F.
; Sapienza, Marcelo T.
; Lima, Marcos S.
; Garanito, Marlene P.
; Santos, Márcia F. A.
; Dorna, Mayra B.
; Aikawa, Nadia E.
; Litvinov, Nadia
; Sakita, Neusa K.
; Gaiolla, Paula V. V.
; Pasqualucci, Paula
; Toma, Ricardo K.
; Correa-Silva, Simone
; Sieczkowska, Sofia M.
; Imamura, Marta
; Forsait, Silvana
; Santos, Vera A.
; Zheng, Yingying
.
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OBJECTIVES: To prospectively evaluate demographic, anthropometric and health-related quality of life (HRQoL) in pediatric patients with laboratory-confirmed coronavirus disease 2019 (COVID-19) METHODS: This was a longitudinal observational study of surviving pediatric post-COVID-19 patients (n=53) and pediatric subjects without laboratory-confirmed COVID-19 included as controls (n=52) was performed. RESULTS: The median duration between COVID-19 diagnosis (n=53) and follow-up was 4.4 months (0.8-10.7). Twenty-three of 53 (43%) patients reported at least one persistent symptom at the longitudinal follow-up visit and 12/53 (23%) had long COVID-19, with at least one symptom lasting for >12 weeks. The most frequently reported symptoms at the longitudinal follow-up visit were headache (19%), severe recurrent headache (9%), tiredness (9%), dyspnea (8%), and concentration difficulty (4%). At the longitudinal follow-up visit, the frequencies of anemia (11% versus 0%, p=0.030), lymphopenia (42% versus 18%, p=0.020), C-reactive protein level of >30 mg/L (35% versus 0%, p=0.0001), and D-dimer level of >1000 ng/mL (43% versus 6%, p=0.0004) significantly reduced compared with baseline values. Chest X-ray abnormalities (11% versus 2%, p=0.178) and cardiac alterations on echocardiogram (33% versus 22%, p=0.462) were similar at both visits. Comparison of characteristic data between patients with COVID-19 at the longitudinal follow-up visit and controls showed similar age (p=0.962), proportion of male sex (p=0.907), ethnicity (p=0.566), family minimum monthly wage (p=0.664), body mass index (p=0.601), and pediatric pre-existing chronic conditions (p=1.000). The Pediatric Quality of Live Inventory 4.0 scores, median physical score (69 [0-100] versus 81 [34-100], p=0.012), and school score (60 [15-100] versus 70 [15-95], p=0.028) were significantly lower in pediatric patients with COVID-19 at the longitudinal follow-up visit than in controls. CONCLUSIONS: Pediatric patients with COVID-19 showed a longitudinal impact on HRQoL parameters, particularly in physical/school domains, reinforcing the need for a prospective multidisciplinary approach for these patients. These data highlight the importance of closer monitoring of children and adolescents by the clinical team after COVID-19.
7.
Hydrogen production by Enterobacter sp. LBTM 2 using sugarcane bagasse hemicellulose hydrolysate and a synthetic substrate: understanding and controlling toxicity
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CAMPOS, IVON M.
; ZOREL, JOSE AUGUSTO
; MENEGATTO, MARILIA
; SILVA, FLAVIANE
; ADARME, OSCAR F.H.
; TONUCCI, MARINA
; BAÊTA, BRUNO E.L.
; AQUINO, SÉRGIO F.
; SILVA, SILVANA Q.
.
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Abstract Sugars released by thermochemical pretreatment of lignocellulosic biomass are possible substrate for hydrogen production. However, the major drawback for bacterial fermentation is the toxicity of weak acids and furan derivatives normally present in such substrate. This study aimed to investigate the metabolism involved in hydrogen production by the isolate Enterobacter LBTM2 using 10, 20 and 30-fold diluted synthetic (SH) and sugarcane bagasse hemicellulose (SBH) hydrolysates. In addition, the effects of acetic acid, formic acid and furfural on the bacterial metabolism, as well as detoxification of SBH with activated carbon and molecularly imprinted polymers on the hydrogen production were assessed. The results showed the best hydrogen yield was 0.46 mmol H2/mmol sugar for 20-times diluted SH, which was 2.3-times higher than obtained in SBH experiments. Bacterial growth and hydrogen production were negatively affected by 0.8 g/L of acetic acid when added alone, but were totally inhibited when formic acid (0.4 g/L) and furfural (0.3 g/L) were also supplied. However the maximum hydrogen production of SBH20 has duplicated when 3% of powdered activated carbon was added to the SBH experiment. The results presented herein can be helpful in understanding the bottlenecks in biohydrogen production and could contribute towards development of lignocellulosic biorefinery.
https://doi.org/10.1590/0001-3765202120201679
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8.
New Allyldithiocarbimates: Synthesis, Structure and Antifungal Activity against Phakopsora pachyrhizi and Hemileia vastatrix
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Vidigal, Antonio E. C.
; Rubinger, Mayura M. M.
; Silva, Lucas F. da
; Zambolim, Laércio
; Pereira, Arthur B. D.
; Guilardi, Silvana
; Souza, Rafael A. C.
; Ellena, Javier
.
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Journal of the Brazilian Chemical Society
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Twelve tetraphenylphosphonium allyldithiocarbimates were synthesized and fully characterized by high-resolution electrospray ionization mass spectrometry (HR-ESI-MS), infrared and nuclear magnetic resonance (NMR) spectroscopies. The spectroscopic data indicated that the allyldithiocarbimate anions present Z configuration, as confirmed by X-ray crystallography. These new compounds inhibited the germination of Phakopsora pachyrhizi and Hemileia vastatrix at very low doses, with IC50 (concentration to achieve 50% of inhibition of spore germination) values ranging from 0.028 to 0.166 mmol L-1, and IC90 (concentration to achieve 90% of inhibition of spore germination) values varying from 0.156 to 0.528 mmol L-1. Allyldithiocarbimate salts are lead compounds for the development of new antifungals for coffee leaf rust and Asian soybean rust, devastating plant diseases with limited control options.
https://doi.org/10.21577/0103-5053.20190234
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9.
A diferença entre sexos nos horários flexíveis de visitação na unidade de terapia intensiva
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Hartmann, Silvana Pinto
; Faria, Larissa Jorge F. de
; Teixeira, Cassiano
; Santos, Cristiane Souza dos
; Maurer, Tiago Claro
; Silva, Daiana Barbosa da
; Rosa, Regis Goulart
.
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Revista Brasileira de Terapia Intensiva
- Métricas do periódico
https://doi.org/10.5935/0103-507x.20190089
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10.
Diversity of yeasts during fermentation of cocoa from two sites in the Brazilian Amazon
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ALMEIDA, Silvana de F. Oliveira de
; SILVA, Letícia R Carvalho
; JUNIOR, Gilson Celso A. Chagas
; OLIVEIRA, Guilherme
; SILVA, Silvia Helena Marques da
; VASCONCELOS, Santelmo
; LOPES, Alessandra Santos
.
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RESUMO A proposta deste estudo foi identificar as leveduras envolvidas na fermentação espontânea de cacau da Amazônia brasileira. A fermentação foi realizada em Medicilândia e Tucumã, Pará, Brasil, durante 6 dias. Em total foram obtidos 44 isolados de leveduras de Medicilândia e 29 de Tucumã. A identificação molecular foi realizada por sequenciamento do fragmento da região D1/D2 do gene rRNA 26S, amplificado com primers universais para eucariotos NL1GC e LS2. Em Medicilândia, foram identificadas Pichia manshurica e Saccharomyces cerevisiae. Em Tucumã foram identificadas cinco espécies (Pichia fermentans, P. kudriavzevii, P. manshurica, S. cerevisiae e Zygosaccharomyces bailii). Os resultados sugerem que P. manshurica e S. cerevisiae podem ter potencial para uso como culturas starter em estudos futuros, para melhorar a qualidade das sementes de cacau fermentadas na Amazônia brasileira.
ABSTRACT The purpose of this study was to identify the yeasts involved in spontaneous fermentation of cocoa from the Brazilian Amazon region. The fermentation process was carried out experimentally with cocoa seeds from two sites (Medicilândia and Tucumã), State of Pará, northern Brazil, during a six-day period. Totals of 44 yeasts were isolated from Medicilândia and 29 from Tucumã. Molecular identification was carried out by sequencing the D1/D2 region fragment of the rRNA 26S gene, expanded with universal primers for the NL1GC and LS2 eukaryotes. Pichia manshurica and Saccharomyces cerevisiae were identified in Medicilândia and five yeast species (Pichia fermentans, P. kudriavzevii, P. manshurica, S. cerevisiae and Zygosaccharomyces bailii) were identified in Tucumã. The results showed that P. manshurica and S. cerevisiae may have potential for use as starter cultures in future studies to improve the quality of cocoa seeds fermented in the Brazilian Amazon region.
https://doi.org/10.1590/1809-4392201703712
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11.
Biomassa e atividade microbiana do solo em diferentes sistemas de cultivo do cafeeiro
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Guimarães, Nathalia de F.
; Gallo, Anderson de S.
; Fontanetti, Anastácia
; Meneghin, Silvana P.
; Souza, Maicon D. B. de
; Morinigo, Kátia P. G.
; Silva, Rogério F. da
.
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O trabalho teve como objetivo avaliar a influência dos diferentes sistemas de cultivo do cafeeiro na biomassa e atividade microbiana do solo. O delineamento experimental consistiu em blocos casualizados, com cinco repetições. A primeira avaliação foi realizada no mês de abril e a segunda no mês de julho de 2015. Os tratamentos foram constituídos por três sistemas de cultivo do cafeeiro e duas áreas testemunhas: 1) Cafeeiro em consociação com espécies arbóreas e Urochloa cv. decumbens; 2) Cafeeiro em consociação com Urochloa cv. decumbens; 3) Cafeeiro em monocultura; 4) Área com solo em pousio e 5) Fragmento de vegetação nativa. A biomassa e atividade microbiana foram avaliadas em amostras de solo colhidas à profundidade de 0,0-0,10 m. As variáveis avaliadas foram: carbono da biomassa microbiana, respiração basal, quociente metabólico, quociente microbiano e carbono orgânico do solo. Avaliou-se também o acúmulo de manta morta (t ha-1) e a humidade do solo (kg kg-1). Os sistemas Fragmento de vegetação nativa, Cafeeiro em consociação com espécies arbóreas e U. cv. decumbens e Cafeeiro consociado com U. cv. decumbens favorecem a biomassa e a atividade microbiana do solo, independente da época de amostragem.
The work aimed to evaluate the influence of different coffee farming systems in soil microbial biomass and activity. The experimental design consisted in randomized blocks in split plot, with five repetitions. Two seasons were evaluated, the first in April and the second in July 2015. The treatments consisted of three coffee cultivation systems and two control areas: 1) Coffee intercropped with trees species and Urochloa cv. decumbens; 2) Coffee intercropped with Urochloa cv. decumbens; 3) Coffee in monoculture; 4) ground fallow and 5) native vegetation fragment. The soil microbial biomass and activity were assessed in soil samples collected at 0.0-0.10 m depth. The following variables were evaluated: microbial biomass carbon, basal respiration, metabolic quotient, microbial quotient and soil organic carbon. Litter accumulation (t ha-1) and soil moisture (kg kg-1) were also evaluated. The systems fragment of native vegetation, Coffee in consortium with tree species and U. cv. decumbens and Coffee intercropped with U. cv. decumbens favour soil microbial biomass and activity, regardless the sampling time.
https://doi.org/10.19084/RCA16041
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12.
The novel mesoporous silica aerogel modified with protic ionic liquid for lipase immobilization
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Barbosa, Anderson S.
; Lisboa, Jessica A.
; Silva, Matheus A. O.
; Carvalho, Nayára B.
; Pereira, Matheus M.
; Fricks, Alini T.
; Mattedi, Silvana
; Lima, Álvaro S.
; Franceschi, Elton
; Soares, Cleide M. F.
.
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Mesoporous silica supports (aerogels) were used to immobilize Burkholderia cepacia lipase (BC) by encapsulation (EN or ENIL), physical adsorption (ADS or ADSIL) and covalent binding (CB or CBIL) into or onto the aerogel modified with protic ionic liquid (PIL). Yield immobilization (Ya) and operational stability were determined by the hydrolytic reaction of olive oil. Ya (37% to 83% by physical adsorption) and operational stability (2 to 23 batches by encapsulation) increased when the support was modified with PIL. For immobilized derivates observed by the BET method, in this case ADS and CB for ADSIL and CBIL, increased pores size was observed, possibly due to the higher amount of BC immobilized conferring Ya and operational stability. This effect was probably attributed to the entry of the enzyme into the pores of the silica aerogel structure. SEM images showed a change in the structure and properties of immobilized lipase derived with PIL. A characteristic FTIR band was obtained for the silanol groups and amides I, IV and V, demonstrating the efficiency of immobilization of BC. The most efficient biocatalysts were ADSIL with regard to yield immobilization and ENIL for operational stability.
https://doi.org/10.5935/0100-4042.20160042
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13.
Antioxidant, hemolytic, antimicrobial, and cytotoxic activities of the tropical Atlantic marine zoanthid Palythoa caribaeorum
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ALENCAR, DANIEL B.
; MELO, ARTHUR A.
; SILVA, GISELLE C.
; LIMA, REBECA L.
; PIRES-CAVALCANTE, KELMA M.S.
; CARNEIRO, RÔMULO F.
; RABELO, ADRIANA S.
; SOUSA, OSCARINA V.
; VIEIRA, REGINE H.S.F.
; VIANA, FRANCISCO A.
; SAMPAIO, ALEXANDRE H.
; SAKER-SAMPAIO, SILVANA
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Anais da Academia Brasileira de Ciências
- Métricas do periódico
Os invertebrados marinhos são capazes de sintetizar compostos bioativos que podem ser benéficos à saúde humana. O objetivo desse estudo foi avaliar as atividades antioxidante, hemolítica, antimicrobiana e citotóxica do extrato bruto (EtOH 70%) e frações em diclorometano (DMC), em acetato de etila (AcOEt) e aquosa (Aq) do zoantídeo marinho Palythoa caribaeorum. Os conteúdos fenólicos totais do extrato bruto e das frações DCM, AcOEt e Aq foram 12,33; 18,17; 10,53 e 3,18 mg AGE por grama, respectivamente. O sequestro do radical DPPH mostrou uma pequena variação. O IC50 do extrato bruto e das frações DCM, AcOEt e Aq foram 11,13; 11,25; 11,74 e 11,28 g mL-1, respectivamente. Dentre as amostras, a habilidade de quelação foi maior no extrato bruto (IC50 302,90 µg mL-1), seguida pelas frações AcOEt, Aq e DCM com 457,77; 547,91 e 641,82 µg mL-1, respectivamente. O poder de redução do ferro apresentou uma densidade óptica em torno de 0,5. As amostras testadas exibiram baixa atividade hemolítica, inferior a 10%, até a concentração de 50 µg mL-1. Não foi observada atividade antimicrobiana para as cepas bacterianas testadas. Para a atividade citotóxica, LC50 de DCM, extrato bruto, AcOEt e Aq foram, respectivamente, 52,10; 83,06; 86,34 e 117,45 µg mL-1, mostrando elevada toxicidade.
Marine invertebrates are capable of synthesizing bioactive compounds, which may be beneficial to human health. The aim of this study was to evaluate the antioxidant, hemolytic, antimicrobial and cytotoxic activities of crude extract (70% EtOH), and dichloromethane (DCM), ethyl acetate (EtOAc), and aqueous (Aq) fractions of the marine zoanthid Palythoa caribaeorum. The phenolic compound contents of the crude extract, DCM, EtOAc and Aq fractions were 12.33, 18.17, 10.53, and 3.18 mg GAE per gram, respectively. DPPH radical scavenging activity showed slight variation. IC50 of crude extract, DCM, EtOAc and Aq fractions were 11.13, 11.25, 11.74, and 11.28 µg mL-1, respectively. Among the sample, ferrous ion chelating was the highest in crude extract (IC50 302.90 µg mL-1), followed by EtOAc, Aq, and DCM fractions with 457.77, 547.91, and 641.82 µg mL-1, respectively. Ferric-reducing antioxidant power showed optical density at about 0.5. The samples tested exhibited low hemolytic activity under 10% up to a concentration of 50 μg mL-1. No antimicrobial activity was observed against any of the tested bacterial strains. For the cytotoxic activity, LC50 of DCM, crude extract, EtOAc, and Aq were 52.10, 83.06, 86.34, and 117.45 μg mL-1, showing high toxicity.
https://doi.org/10.1590/0001-3765201520140370
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14.
Growing knowledge: an overview of Seed Plant diversity in Brazil
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Zappi, Daniela C.
; Filardi, Fabiana L. Ranzato
; Leitman, Paula
; Souza, Vinícius C.
; Walter, Bruno M.T.
; Pirani, José R.
; Morim, Marli P.
; Queiroz, Luciano P.
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; Forzza, Rafaela C.
; Abreu, Maria C.
; Acevedo-Rodríguez, Pedro
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Resumo Um levantamento atualizado das plantas com sementes e análises relevantes acerca desta biodiversidade são apresentados. Este trabalho se iniciou em 2010 com a publicação do Catálogo de Plantas e Fungos e, desde então vem sendo atualizado por mais de 430 especialistas trabalhando online. O Brasil abriga atualmente 32.086 espécies nativas de Angiospermas e 23 espécies nativas de Gimnospermas e estes novos dados mostram um aumento de 3% da riqueza em relação a 2010. A Amazônia é o Domínio Fitogeográfico com o maior número de espécies de Gimnospermas, enquanto que a Floresta Atlântica possui a maior riqueza de Angiospermas. Houve um crescimento considerável no número de espécies e nas taxas de endemismo para a maioria dos Domínios (Caatinga, Cerrado, Floresta Atlântica, Pampa e Pantanal), com exceção da Amazônia que apresentou uma diminuição de 2,5% de endemicidade. Entretanto, a maior parte das plantas com sementes que ocorrem no Brasil (57,4%) é endêmica deste território. A proporção de formas de vida varia de acordo com os diferentes Domínios: árvores são mais expressivas na Amazônia e Floresta Atlântica do que nos outros biomas, ervas são dominantes no Pampa e as lianas apresentam riqueza expressiva na Amazônia, Floresta Atlântica e Pantanal. Este trabalho não só quantifica a biodiversidade brasileira, mas também indica as lacunas de conhecimento e o desafio a ser enfrentado para a conservação desta flora.
Abstract An updated inventory of Brazilian seed plants is presented and offers important insights into the country's biodiversity. This work started in 2010, with the publication of the Plants and Fungi Catalogue, and has been updated since by more than 430 specialists working online. Brazil is home to 32,086 native Angiosperms and 23 native Gymnosperms, showing an increase of 3% in its species richness in relation to 2010. The Amazon Rainforest is the richest Brazilian biome for Gymnosperms, while the Atlantic Rainforest is the richest one for Angiosperms. There was a considerable increment in the number of species and endemism rates for biomes, except for the Amazon that showed a decrease of 2.5% of recorded endemics. However, well over half of Brazillian seed plant species (57.4%) is endemic to this territory. The proportion of life-forms varies among different biomes: trees are more expressive in the Amazon and Atlantic Rainforest biomes while herbs predominate in the Pampa, and lianas are more expressive in the Amazon, Atlantic Rainforest, and Pantanal. This compilation serves not only to quantify Brazilian biodiversity, but also to highlight areas where there information is lacking and to provide a framework for the challenge faced in conserving Brazil's unique and diverse flora.
https://doi.org/10.1590/2175-7860201566411
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Imobilização de lipase por encapsulação em sílica aerogel
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Barbosa, Anderson dos S.
; Silva, Matheus Albuquerque de O.
; Carvalho, Nayara B.
; Mattedi, Silvana
; Iglesias, Miguel Angel
; Fricks, Alini T.
; Lima, Álvaro S.
; Franceschi, Elton
; Soares, Cleide M. F.
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Lipase from Burkholderia cepacia was immobilized in a silica matrix and dried in high pressure carbon dioxide media (aerogel). The protic ionic liquid (PIL) was used in the immobilization process by encapsulation. The objective of this work was to evaluate the influence of the drying technique using supercritical carbon dioxide in biocatalysts obtained through the sol-gel technique by evaluating temperature and pressure and, after selecting the best drying conditions, to investigate the application of the technique for the biocatalyst using ionic liquid as an additive in the immobilization process. The results for immobilized biocatalysts showed that the best conditions of pressure and temperature were 100 bar and 25 ºC, respectively, giving a total activity recovery yield of 37.27% without PIL (EN) and 44.23% with PIL (ENLI). The operational stability of the biocatalysts showed a half-life of 11.4 h for ENLI and 6 h for EN. Therefore, solvent extraction using supercritical CO2, besides shortening drying time, offers little resistance to the immobilization of lipases, since their macropores provide ample room for their molecules. The use of the ionic liquid as an additive in the process studied for the immobilization of enzymes produced attractive yields for immobilization and therefore has potential for industrial applications in the hydrolysis of vegetable oils.
https://doi.org/10.5935/0100-4042.20140155
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