Search | SciELO

ABSTRACT Although soybean is one of the most important agricultural commodities in the world, it has been losing genetic diversity in recent decades, due to the intense breeding process and reproduction method. Thus, the objective of this study was to evaluate the agronomic performance and estimate the genetic diversity among inbred lines, and identify promising crossings. A total of 66 soybean genotypes were evaluated, 61 of which were pre-commercial lines, and five commercial cultivars (AS3797, DESAFIO, M7110, M7739, M8210) as controls. The experimental design consisted of randomized blocks with three replicates. The distance matrix between the inbred lines was calculated by Mahalanobis distance and grouping by the unweighted pair group method with arithmetic mean (UPGMA). The maximum distance was 1,776.26 between cultivar M7110 and the G23 inbred line, and the minimum 1.50 between inbred lines G13 and G36, with an average distance of 364.40, demonstrating genetic diversity. The traits that contributed most to genetic divergence were number of days to flowering (66.7%) and physiological maturation (28.55%). Inbred lines G60 (higher grain yield), G51 and G33 (lower physiological maturation) and cultivar M7110 (greater divergence) stood out. Four groups were formed, with G1 having the highest grain yield and fewest days to flowering and physiological maturation. The indicated crossings are between G60, G57, CD2728, M7110, G33 and G32 (group G1) and G47 (group G4).

RESUMO A soja é uma das mais importantes comodities agrícolas mundiais, no entanto, devido ao intenso processo de melhoramento e sua forma de reprodução, vem perdendo diversidade genética ao longo das últimas décadas. Assim, o objetivo deste estudo foi avaliar o desempenho agronômico, estimar a diversidade genética entre as linhagens e identificar cruzamentos promissores. Para isto, foram avaliados 66 genótipos de soja, sendo 61 linhagens pré-comerciais e cinco cultivares comerciais (AS3797, DESAFIO, M7110, M7739, M8210) como controles. O delineamento experimental foi o de blocos ao acaso com três repetições. A matriz de distância entre as linhagens foi calculada pela distância de Mahalanobis e o agrupamento pelo método da ligação média entre grupos (UPGMA). A distância máxima foi de 1.776,26 entre as linhagens M7110 e G23, e a mínima de 1,50 entre as linhagens G13 e G36, sendo a distância média de 364,40, demonstrando a existência de diversidade genética. Os caracteres que mais contribuíram para a divergência genética foram número de dias para o florescimento (66,7%) e maturação fisiológica (28,55%). As linhagens G60 (maior produtividade de grãos), G51 e G33 (menor maturação fisiológica) e a cultivar M7110 (maior divergência) se destacaram. Formaram-se quatro grupos, sendo o grupo G1 com maior produtividade de grãos e menor número de dias para o florescimento e maturação fisiológica. Os cruzamentos indicados são entre G60, G57, CD2728, M7110, G33 e G32 (grupo G1) com a G47 (grupo G4).

https://doi.org/10.1590/1807-1929/agriambi.v28n3e272048

Exogenous application of salicylic acid induces salinity tolerance in eggplant seedlings
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Sousa, V. F. O.

; Santos, A. S.

; Sales, W. S.

; Silva, A. J.

; Gomes, F. A. L.

; Dias, T. J.

; Gonçalves-Neto, A. C.

; Faraz, A.

; Santos, J. P. O.

; Santos, G. L.

; Cruz, J. M. F. L.

; Silva, L. D. R.

; Araújo, J. R. E. S.

Brazilian Journal of Biology

Journal Metrics
- Sobre o periódico
- SciELO Analytics

2024, Volume 84 elocation e257739

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo Em condições de estresse salino, o crescimento das plantas é reduzido, em virtude, do desequilíbrio osmótico, nutricional e oxidativo. Contudo, o ácido salicílico atua na mitigação desse estresse abiótico por promover incremento no crescimento, fotossíntese, metabolismo do nitrogênio, síntese de osmorreguladores e enzimas antioxidantes. Nesse contexto, objetivou-se avaliar o efeito de doses de ácido salicílico sobre o crescimento e alterações fisiológicas de mudas de berinjela sob estresse salino. O experimento foi conduzido em casa de vegetação, onde os tratamentos foram distribuídos em blocos ao acaso utilizando uma matriz composta central Box com cinco níveis de condutividade elétrica da água de irrigação (CEa) (0,50; 1,08; 2,50; 3,92 e 4,50 dS m-1), associada a cinco doses de ácido salicílico (AS) (0,00; 0,22; 0,75; 1,28 e 1,50 mM), com quatro repetições e cada parcela composta por três plantas. Aos 40 dias após a semeadura, foram determinados a altura da planta, diâmetro do caule, número de folhas, área foliar, vazamento de eletrólito, teor relativo de água e massa seca total. A CEa e a aplicação de AS influenciaram no crescimento e nas alterações fisiológicas das mudas de berinjela. O aumento da CEa reduziu o crescimento na ausência de AS. O dano de membrana com o uso de AS manteve-se estável até 3,9 dS m-1 de CEa. O conteúdo relativo de água independentemente da CEa aumentou com 1 mM de SA. O uso de AS na concentração de 1 mM mitigou o efeito deletério da salinidade no crescimento das mudas até 2,50 dS m-1 de CEa.

Abstract Under salt stress conditions, plant growth is reduced due to osmotic, nutritional and oxidative imbalance. However, salicylic acid acts in the mitigation of this abiotic stress by promoting an increase in growth, photosynthesis, nitrogen metabolism, synthesis of osmoregulators and antioxidant enzymes. In this context, the objective was to evaluate the effect of salicylic acid doses on the growth and physiological changes of eggplant seedlings under salt stress. The experiment was conducted in a greenhouse, where the treatments were distributed in randomized blocks using a central composite matrix Box with five levels of electrical conductivity of irrigation water (CEw) (0.50; 1.08; 2.50; 3.92 and 4.50 dS m-1), associated with five doses of salicylic acid (SA) (0.00; 0.22; 0.75; 1.28 and 1.50 mM), with four repetitions and each plot composed of three plants. At 40 days after sowing, plant height, stem diameter, number of leaves, leaf area, electrolyte leakage, relative water content, and total dry mass were determined. ECw and SA application influenced the growth and physiological changes of eggplant seedlings. Increasing the ECw reduced growth in the absence of SA. Membrane damage with the use of SA remained stable up to 3.9 dS m-1 of ECw. The relative water content independent of the CEw increased with 1.0 mM of SA. The use of SA at the concentration of 1.0 mM mitigated the deleterious effect of salinity on seedling growth up to 2.50 dS m-1 of ECw.

https://doi.org/10.1590/1519-6984.257739

Antifungal activity of 2-chloro-N-phenylacetamide: a new molecule with fungicidal and antibiofilm activity against fluconazole-resistant Candida spp.
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Diniz-Neto, H.

; Silva, S. L.

; Cordeiro, L. V.

; Silva, D. F.

; Oliveira, R. F.

; Athayde-Filho, P. F.

; Oliveira-Filho, A. A.

; Guerra, F. Q. S.

; Lima, E. O.

Brazilian Journal of Biology

Journal Metrics
- Sobre o periódico
- SciELO Analytics

2024, Volume 84 elocation e255080

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo No atual contexto de patógenos fúngicos resistentes emergentes tais como Candida albicans e Candida parapsilosis, a descoberta de novos agentes antifúngicos é uma questão urgente. Esta pesquisa teve como objetivo avaliar o potencial antifúngico da 2-cloro-N-fenilacetamida contra cepas clínicas de C. albicans e C. parapsilosis resistentes a fluconazol. A atividade antifúngica da substância foi avaliada in vitro através da determinação da concentração inibitória mínima (CIM), concentração fungicida mínima (CFM), ruptura e inibição da formação de biofilme, ensaios de sorbitol e ergosterol, e associação entre esta molécula e antifúngicos comuns, anfotericina B e fluconazol. O produto teste inibiu todas as cepas de C. albicans e C. parapsilosis, com uma CIM variando de 128 a 256 µg.mL-1, e uma CFM de 512-1,024 µg.mL-1. Também inibiu até 92% da formação de biofilme e causou a ruptura de até 87% de biofilme pré-formado. A 2-cloro-N-fenilacetamida não promoveu atividade antifúngica pela ligação ao ergosterol da membrana celular fúngica, tampouco danificou a parede celular. Antagonismo foi observado ao combinar esta substância com anfotericina B e fluconazol. A substância exibiu atividade antifúngica significativa ao inibir tanto as células planctônicas quanto o biofilme das cepas resistentes ao fluconazol. Sua combinação com outros antifúngicos deve ser evitada e seu mecanismo de ação deve ser estabelecido.

Abstract In the current context of emerging drug-resistant fungal pathogens such as Candida albicans and Candida parapsilosis, discovery of new antifungal agents is an urgent matter. This research aimed to evaluate the antifungal potential of 2-chloro-N-phenylacetamide against fluconazole-resistant clinical strains of C. albicans and C. parapsilosis. The antifungal activity of 2-chloro-N-phenylacetamide was evaluated in vitro by the determination of the minimum inhibitory concentration (MIC), minimum fungicidal concentration (MFC), inhibition of biofilm formation and its rupture, sorbitol and ergosterol assays, and association between this molecule and common antifungal drugs, amphotericin B and fluconazole. The test product inhibited all strains of C. albicans and C. parapsilosis, with a MIC ranging from 128 to 256 µg.mL-1, and a MFC of 512-1,024 µg.mL-1. It also inhibited up to 92% of biofilm formation and rupture of up to 87% of preformed biofilm. 2-chloro-N-phenylacetamide did not promote antifungal activity through binding to cellular membrane ergosterol nor it damages the fungal cell wall. Antagonism was observed when combining this substance with amphotericin B and fluconazole. The substance exhibited significant antifungal activity by inhibiting both planktonic cells and biofilm of fluconazole-resistant strains. Its combination with other antifungals should be avoided and its mechanism of action remains to be established.

https://doi.org/10.1590/1519-6984.255080

Evaluation of antibacterial and antifungal activity of antimicrobial soaps
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Santos Junior, C. J.

; Lins, F. C. C. O.

; Santos, P. O.

; Silva, V. B.

; Barros, Y. V. R.

; Araújo, M. A. S.

; Rocha, T. J. M.

; Souza, A. K. P.

Brazilian Journal of Biology

Journal Metrics
- Sobre o periódico
- SciELO Analytics

2024, Volume 84 elocation e263364

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo Os sabonetes têm um papel importante para a nossa higiene e saúde, pois eles além de ter efeito bactericida, também removem as sujeiras presentes no corpo humano. Avaliar a eficácia de sabonetes com atividade antimicrobiana de diferentes marcas comerciais vendidas no Brasil. Foram realizados ensaios da atividade antimicrobiana dos diferentes sabonetes através do método difusão em ágar frente aos microrganismos Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Enterobacter cloacae, Acinetobacter baumannii, Proteus mirabilis e Candida albicans. Todos os sabonetes comerciais testados apresentaram formação de halo de inibição antimicrobiana frente às bactérias S. aureus e P. aeruginosa. Apenas dois sabonetes comerciais apresentaram inibição das espécies A. baumannii e C. albicans. Nenhum dos sete produtos estudados apresentou inibição das bactérias E. cloacae, P. mirabilis e E. coli. Na comparação das informações contidas nas embalagens dos produtos com os resultados obtidos durante a pesquisa realizada foram observadas divergências. Os sabonetes que apresentaram maior eficiência contra os microrganismos testados foram aqueles das apresentações 1 e 2, que se mostraram eficazes contra as espécies de bactérias S. aureus, P. aeruginosa e A. baumannii e contra a espécie de fungo C. albicans. As marcas 3, 4, 5, 6 e 7 apresentaram o mesmo resultado de sensibilidade frente as bactérias das espécies S. aureus e P. aeruginosa, com variação quantitativa apenas do halo de inibição. Houve divergência entre as informações contidas nas embalagens dos sete produtos em estudo e os resultados dos testes experimentais.

Abstract Soaps play an important role in our hygiene and health, as they not only have a bactericidal effect but also remove dirt from the human body. To evaluate the effectiveness of soaps with antimicrobial activity from different commercial brands sold in Brazil. Tests of the antimicrobial activity of different soaps were carried out through diffusion in agar against the microorganisms Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Enterobacter cloacae, Acinetobacter baumannii, Proteus mirabilis, and Candida albicans. All commercial soaps tested transfer antimicrobial inhibition halo formation against S. aureus and P. aeruginosa bacteria. Only two commercial soaps inhibit the species A. baumannii and C. albicans. None of the seven products studied showed inhibition of E. cloacae, P. mirabilis, and E. coli bacteria. When comparing the information contained in the packaging of the products with the results obtained during a survey, divergences were observed. The soaps that provide greater efficiency against the tested microorganisms were presented in presentations 1 and 2, which become useful against the bacteria species S. aureus, P. aeruginosa, and A. baumannii and a fungus species C. albicans. Marks 3, 4, 5, 6, and 7 parallel the same sensitivity result opposite as bacteria of the species S. aureus and P. aeruginosa, with quantitative variation only of the inhibition halo. There was a divergence between the information contained in the packaging of the seven products under study and the results of the experimental tests.

https://doi.org/10.1590/1519-6984.263364

Biochar and Hydrochar in the Development and Application of Electrochemical Devices in the Sensing and Degradation of Target Compounds: A Mini-Review of the Recent Contributions of 2020-2023
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Silva, Jonatas O. S.

; Granja, Honnara S.

; Santos, José F. dos

; Freitas, Lisiane S.

; Sussuchi, Eliana M.

Journal of the Brazilian Chemical Society

Journal Metrics
- Sobre o periódico
- SciELO Analytics

2024, Volume 35 N. 1 elocation e-20230143

Abstract: En | Text: En | PDF: En

In this review, we present the versatility of biomass and its derivatives obtained through thermal conversion processes (biochar and hydrochar) for applications in the development of electrochemical devices. This work highlights the generation of carbonaceous materials through pyrolysis and hydrothermal carbonization, in addition to proposing strategies to modify their physicochemical properties through activation methodologies to enhance their application as electrode materials. The processes of monitoring and degrading chemical species are discussed based on the diversity of electrodes that can be obtained with these bioderived coals, according to recent contributions available in the literature (2020-2023), which show the wide applicability of these materials in the field of electrochemistry.

https://doi.org/10.21577/0103-5053.20230143

Hydroponic watercress production through fish farming water reuse and varied nutrient solution recirculation times
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Oliveira, Davi R.

; Oliveira, Willame C. de

; Silva, Alexsandro O. da

; Bezerra, Bruno G. M. da C.

; Sousa, Geocleber G. de

; Lacerda, Claudivan F. de

Revista Brasileira de Engenharia Agrícola e Ambiental

Journal Metrics
- Sobre o periódico
- SciELO Analytics

dec 2023, Volume 27 N. 12 Pages 919 - 926

Abstract: En Pt | Text: En Pt | PDF: En | PDF: Pt

ABSTRACT Aiming at a more sustainable food production, the reuse of effluent from fish farming in hydroponics can be a viable option. Thus, the objective of present study was to evaluate the effects of the use of effluent from fish farming on the development of ‘Folha Larga’ watercress and the possibility of reducing the use of fertilizer in a hydroponic system. The assay was carried out in a greenhouse from October 2021 to February 2022 (two cycles). The treatments were distributed in randomized blocks, with four replications, with split plots, consisting of two times of recirculation of the solution in the plots (T1 = 15 min operating by 15 min off and T2 = 15 min operating by 30 min off) and five solutions, in the subplots, obtained by mixing different proportions (0, 25, 50, 75, and 100%) of nutrient solution and effluent from fish farming. The variables analyzed were: plant height, number of leaflets, leaf area, SPAD index, fresh and dry weight of the aerial part and roots. The use of effluent from fish farming reduces the amount of fertilizers for the yield of ‘Folha Larga’ watercress. Nutrient solution recirculation time of 15 minutes is suitable for hydroponic watercress.

RESUMO Visando uma produção de alimentos mais sustentável, a reutilização de efluente da piscicultura na hidroponia pode ser uma opção viável. Assim, objetivo desta pesquisa foi avaliar os efeitos do uso de efluente da piscicultura no desenvolvimento do agrião ‘Folha Larga’ e a possibilidade de redução do uso de fertilizantes em sistema hidropônico. A pesquisa foi realizada em casa de vegetação entre outubro de 2021 e fevereiro de 2022 (dois ciclos). Os tratamentos foram distribuídos em blocos ao acaso, com quatro repetições, com parcelas subdivididas, consistindo em dois tempos de recirculação da solução nas parcelas (T1 = 15 min operando por 15 min desligado e T2 = 15 min operando por 30 min desligado) e cinco soluções, nas subparcelas, obtidas pela mistura em diferentes proporções (0, 25, 50, 75 e 100%) de solução nutritiva e efluente da piscicultura. As variáveis analisadas foram: altura de plantas, número de folíolos, área foliar, índice SPAD, massa fresca e massa seca da parte aérea e raiz. O uso de efluente da piscicultura reduz a quantidade de fertilizantes para a produção de agrião ‘Folha Larga’. O tempo de recirculação da solução nutritiva de 15 minutos é adequado para o agrião hidropônico.

https://doi.org/10.1590/1807-1929/agriambi.v27n12p919-926

Long-term oncological and surgical outcomes after Video Endoscopic Inguinal Lymphadenectomy (VEIL) in patients with penile cancer
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Tobias-Machado, Marcos

; Ornellas, Antonio A.

; Hidaka, Alexandre K.

; Medina, Luis G.

; Mattos, Pablo A. L.

; Besio, Ruben S.

; Abreu, Diego

; Castro, Pedro R.

; Nishimoto, Ricardo H.

; Astigueta, Juan

; Dourado, Aurus

; Machado, Roberto D.

; Magnabosco, Wesley J.

; Corona-Montes, Victor

; Villoldo, Gustavo M.

; Zampolli, Hamilton C.

; Taha, Anis

; Auad, Pericles R.

; Faria, Eliney F.

; Arantes, Paulo B. O.

; Tavares, Alessandro

; Nascimento, Francisco S. M. S.

; Brazão Jr., Eder S.

; Rocha, Maurício M.

; Costa, Walter H.

; Panico, Vinicius

; Reis, Leonardo O.

; Almeida-Carrera, Roberto J.

; Silva, Rafael C.

; Zequi, Stênio C.

; Calixto, José R. R.

; Sotelo, Rene

International braz j urol

Journal Metrics
- Sobre o periódico
- SciELO Analytics

oct 2023, Volume 49 N. 5 Pages 580 - 589

Abstract: En | Text: En | PDF: En

ABSTRACT Objective: To report outcomes from the largest multicenter series of penile cancer patients undergoing video endoscopic inguinal lymphadenectomy (VEIL). Materials and Methods: Retrospective multicenter analysis. Authors of 21 centers from the Penile Cancer Collaborative Coalition-Latin America (PeC-LA) were included. All centers performed the procedure following the same previously described standardized technique. Inclusion criteria included penile cancer patients with no palpable lymph nodes and intermediate/high-risk disease and those with non-fixed palpable lymph nodes less than 4 cm in diameter. Categorical variables are shown as percentages and frequencies whereas continuous variables as mean and range. Results: From 2006 to 2020, 210 VEIL procedures were performed in 105 patients. Mean age was 58 (45-68) years old. Mean operative time was 90 minutes (60-120). Mean lymph node yield was 10 nodes (6-16). Complication rate was 15.7%, including severe complications in 1.9% of procedures. Lymphatic and skin complications were noted in 8.6 and 4.8% of patients, respectively. Histopathological analysis revealed lymph node involvement in 26.7% of patients with non-palpable nodes. Inguinal recurrence was observed in 2.8% of patients. 10y- overall survival was 74.2% and 10-y cancer specific survival was 84.8%. CSS for pN0, pN1, pN2 and pN3 were 100%, 82.4%, 72.7% and 9.1%, respectively. Conclusion: VEIL seems to offer appropriate long term oncological control with minimal morbidity. In the absence of non-invasive stratification measures such as dynamic sentinel node biopsy, VEIL emerged as the alternative for the management of non-bulky lymph nodes in penile cancer.

https://doi.org/10.1590/s1677-5538.ibju.2023.0065

Antifungal action of essential oils against Fusarium rot in melon
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Sousa, Aline E. D. de

; Melo, Rafaela P.

; Gagliardi, Paulo R.

; Nunes, Glauber H. de S

; Oster, Andreia H.

; Silva, Ebenézer de O.

Revista Caatinga

Journal Metrics
- Sobre o periódico
- SciELO Analytics

sep 2023, Volume 36 N. 3 Pages 486 - 493

Abstract: En Pt | Text: En Pt | PDF: En | PDF: Pt

ABSTRACT The objective of this work was to determine the composition and evaluate in vitro and in vivo effects of essential oils (Lippia sidoides Cham., Ocimum gratissimum L., Cymbopogon citratus Stapf., Ocimum selloi Benth., Citrus sinensis L., Ocimum micranthum Willd., Ocimum sp., and Piper aduncum L.) on the control of Fusarium rot in melon fruits, caused by the fungus Fusarium pallidoroseum. The essential oils were obtained by hydrodistillation and their chemical composition was determined by GCMS and GC-FID. The effect of each essential oil (concentrations of 0, 500, 1500, and 3000µL L-1) on the fungal mycelial growth was evaluated in in vitro experiment. The effective concentration that inhibited 50% of mycelial growth (EC50) was determined through the probit method; mycelial growth index (MGI) was also calculated. The essential oils with higher potential for inhibiting mycelial growth of F. pallidoroseum were evaluated for their inhibitory effect on the fungus spore germination in in vitro and in vivo experiments using melon fruits (variety Galia). Chemical composition analysis of essential oils enabled the identification of varying amounts of chemical compounds, with predominance of monoterpenes. The essential oils of L. sidoides, O. gratissimum, C. citratus, and O. micranthum presented higher inhibiting effects on F. pallidoroseum mycelial growth and spore germination, therefore, they are promising raw materials for the development of commercial fungicides, mainly for controlling postharvest rot caused by F. pallidoroseum.

RESUMO Objetivou-se com esse trabalho determinar a composição e avaliar, ‘in vitro’ e ‘in vivo’, o efeito dos óleos essenciais de alecrim-pimenta (Lippia sidoides Cham.), alfavacacravo (Ocimum gratissimum L.), capim-limão (Cymbopogon citratus Stapf.), elixir-paregórico (Ocimum selloi Benth.), laranja (Citrus sinensis L.), manjericão (Ocimum micranthum Willd.), Ocimum sp. e pimenta-de-macaco (Piper aduncum L.) no controle da podridão por Fusarium causada pelo fungo Fusarium pallidoroseum em frutos de melão. Os óleos essenciais foram obtidos por hidrodestilação e a composição química determinada por GC-MS e GC-FID. No ensaio ‘in vitro’, foi testado o efeito de cada óleo essencial (concentrações de 0, 500, 1500 e 3000µL/L) sobre o crescimento micelial do patógeno. Determinou-se a concentração efetiva que inibiu o crescimento micelial em 50% (EC50) pelo método de probit e o Índice de Crescimento Micelial (ICM). Os óleos essenciais com maior potencial inibidor no crescimento micelial do F. pallidoroseum foram avaliados quanto ao efeito inibitório na germinação de esporos do fungo no ensaio ‘in vitro’ e ‘in vivo’ com frutos de melão ‘Galia’. A análise da composição química possibilitou a identificação de quantidades variáveis de compostos químicos, com predominância dos compostos monoterpênicos. Os óleos essenciais de alecrimpimenta, alfavaca-cravo, capim-limão e manjericão, apresentaram melhores efeitos na inibição do crescimento micelial e germinação dos esporos do fungo, mostrando-se promissores como matériaprima para o desenvolvimento de fungicidas comerciais, em especial no controle de podridão causada por F. pallidoroseum, em póscolheita.

https://doi.org/10.1590/1983-21252023v36n301rc

Genetic algorithm in the design of soybean silos for airflow homogenization
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Petravicius, Daniel

; Binelo, Manuel O.

; Binelo, Marcia de F. B.

; Faoro, Vanessa

; Silva, José A. G. da

Revista Brasileira de Engenharia Agrícola e Ambiental

Journal Metrics
- Sobre o periódico
- SciELO Analytics

jul 2023, Volume 27 N. 7 Pages 531 - 538

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

RESUMO Um dos processos mais usados para garantir a qualidade dos grãos em grandes armazéns é a aeração. Um modelo de otimização que considere a natureza limitada e discreta das entradas de ar, além das características geométricas do armazém dos grãos, pode produzir resultados mais facilmente aplicáveis no design de novos armazéns graneleiros. O objetivo deste estudo foi parametrizar e aplicar o modelo de Darcy-Forchheimer para simulação de fluxo de ar em massa de grãos de soja em função da altura da camada de grãos e desenvolver um método de inteligência artificial baseado em algoritmos genéticos para otimizar as dimensões do armazém de grãos e a configuração das entradas de ar para obter um fluxo de ar mais homogêneo na massa de grãos. A parametrização considerou o efeito da compactação dos grãos e as simulações em OpenFOAM mostraram boa concordância com os dados experimentais. O algoritmo genético proposto foi capaz de aumentar a homogeneidade do fluxo de ar se comparada ao armazém usado como referência. aeração graneleiros DarcyForchheimer Darcy Forchheimer experimentais referência

ABSTRACT One of the main processes used to maintain grain quality in large storage bins is aeration. An optimization model that considers the limited and discrete nature of the air inlets, in addition to the geometric characteristics of the storage bin, could produce results more easily applicable results for the design of new grain storage bins. The objective of this study was to parameterize and to apply the Darcy-Forchheimer model for simulating airflow in soybean grain mass as function of grain layer height, and develop an artificial intelligence method based on genetic algorithm for optimizing grain storage bin dimensions and air inlet configurations to obtain a more homogeneous airflow in the grain mass. The parameterization considered the effect of grain compaction and the OpenFOAM simulations showed good agreement with the experimental data. The proposed genetic algorithm was able to increase the airflow homogenization when compared to the grain storage bin used as reference. aeration inlets DarcyForchheimer Darcy Forchheimer height data reference

https://doi.org/10.1590/1807-1929/agriambi.v27n7p531-538

10.

Effect of drying conditions on physiological quality of cowpea seeds of the cultivar brs-tumucumaque
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Assis, Miquéias de O.

; Araujo, Eduardo F.

; de Freitas, Francisco C. L.

; da Silva, Laercio J.

; Araujo, Roberto F.

Revista Caatinga

Journal Metrics
- Sobre o periódico
- SciELO Analytics

jun 2023, Volume 36 N. 2 Pages 262 - 270

Abstract: En Pt | Text: En Pt | PDF: En | PDF: Pt

ABSTRACT Seed drying has many advantages, but it can cause irreversible damages, compromising the physiological quality of seeds, especially when they present high water contents. The objective of this work was to evaluate the effect of drying conditions (inside and outside the pod) on the physiological quality of cowpea seeds of the cultivar BRS-Tumucumaque before and after storage. A completely randomized experimental design with four replications was used, in a split-plot arrangement. The plots consisted of combinations of harvest seasons (1, 2, 3, 4, and 5) and artificial seed drying conditions (inside and outside the pod); and the subplots consisted of storage times (0 and 6 months). The seed water contents were determined and the seeds were evaluated for germination, first germination count, emergence, emergence index, accelerated aging, and electrical conductivity. Higher physiological quality was found for dried seeds inside the pods, which was more evident in seasons 1 and 2, in both storage times. In the other seasons, the drying conditions had no effect on seed germination and vigor at the beginning of storage. The dried seeds inside the pods showed greater vigor after six months of storage. Drying seeds inside the pods favors the maintenance of physiological quality and allows artificial drying of cowpea seeds of the cultivar BRS-Tumucumaque with water content of 47%. Artificial drying of seeds with water contents higher than 32.5% is not recommended for the condition outside the pod. The seed physiological potential decreases after six months of storage, regardless of the drying condition.

RESUMO A secagem pode causar prejuízos à qualidade das sementes, principalmente quando apresentam teor de água elevado. Objetivou-se avaliar a influência de condições de secagem na qualidade fisiológica inicial e após armazenamento de sementes de feijão-caupi, cv. BRS Tumucumaque. O delineamento experimental utilizado foi inteiramente casualizado, com quatro repetições, em esquema de parcelas subdivididas. Nas parcelas foram alocadas a combinações dos fatores época de colheita (1, 2, 3, 4 e 5) e condição de secagem artificial das sementes (dentro e fora da vagem); os tempos de armazenamento (0 e 6 meses) foram alocados na subparcela. Determinou-se o teor de água e as sementes foram avaliadas pelos testes de germinação, primeira contagem de germinação, emergência, índice de velocidade de emergência, envelhecimento acelerado e condutividade elétrica. Resultados superiores de qualidade fisiológica foram verificados para as sementes secas dentro da vagem, fato mais evidente nas épocas 1 e 2, em ambos os tempos de armazenamento. Para as demais épocas, no início do armazenamento não houve efeito da condição de secagem na germinação e vigor. As sementes secas dentro da vagem apresentaram maior vigor após seis meses de armazenamento. A secagem dentro da vagem favorece a manutenção da qualidade fisiológica e permite a secagem artificial de sementes de feijão-caupi, cv. BRS Tumucumaque, com teor de água de 47%. Não se recomenda a secagem artificial de sementes com teor de água acima de 32,5% na condição fora da vagem. Após seis meses de armazenamento, independentemente da condição de secagem, há redução no potencial fisiológico das sementes.

https://doi.org/10.1590/1983-21252023v36n203rc

11.

Production, gas and biochemical exchanges in pear cultivated in semi-arid region under different irrigation managements
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Gomes, Victor H. F.

; Simões, Welson L.

; Silva, Jucicléia S. da

; Garrido, Marlon da S.

; Silva, José A. B. da

; Lopes, Paulo R. C.

; Silva, Weslley O. da

; Santos, Leane R. dos

Revista Brasileira de Engenharia Agrícola e Ambiental

Journal Metrics
- Sobre o periódico
- SciELO Analytics

may 2023, Volume 27 N. 5 Pages 335 - 342

Abstract: En Pt | Text: En Pt | PDF: En | PDF: Pt

ABSTRACT The objective of this study was to evaluate the influence of irrigation systems and water depths on physiological, biochemical and production processes of pear trees grown in the Brazilian semi-arid region. The experimental design was randomized blocks, with 2 × 4 factorial scheme, corresponding to two irrigation systems (drip and microsprinkler) and four irrigation depths (60, 80, 100 and 120% of the crop evapotranspiration - ETc), with four replicates. Water deficit and excess applied to plants are harmful to gas exchange as well as to biosynthesis and accumulation of carbohydrates, amino acids and proteins in leaves, compromising the cultivation cycle of pear plants grown in the Sub-Middle São Francisco region. The irrigation depth of 91.8% ETc promotes the highest production of pear (18.49 kg plant-1) under drip and microsprinkler irrigation systems, under the edaphoclimatic conditions of the Sub-Middle São Francisco region.

RESUMO O objetivo deste trabalho foi avaliar a influência de sistemas de irrigação e lâminas de irrigação sobre processos fisiológicos, bioquímicos e produtivos da pereira cultivada no Semiárido brasileiro. O delineamento experimental foi em blocos casualizados, com fatorial 2 x 4, sendo dois sistemas de irrigação (gotejamento e microaspersão) e quatro lâminas de irrigação (60; 80; 100 e 120% da evapotranspiração da cultura - ETc), com quatro repetições. A deficiência e o excesso hídrico aplicados às plantas são prejudiciais às trocas gasosas, bem como à biossíntese e acúmulo de carboidratos, aminoácidos e proteínas nas folhas, comprometendo o ciclo de cultivo de pereiras cultivadas na região do Submédio São Francisco. A lâmina de irrigação de 91,8% ETc promove a maior produção de pereira (18,49 kg planta-1) sob sistemas de irrigação por gotejamento e microaspersão, nas condições edafoclimáticas do Submédio São Francisco.

https://doi.org/10.1590/1807-1929/agriambi.v27n5p335-342

12.

Growth and physiology of ‘Sunrise’ papaya seedlings in response to salinity and humic acid
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Targino, Vitor A.

; Lopes, Adriano S.

; Sousa, Valéria F. de O.

; Henschel, Juliane M.

; Silva, João H. B. da

; Rodrigues, Lucas S.

; Medeiros, Wiliana J. F. de

; Batista, Diego S.

; Dias, Thiago J.

Revista Brasileira de Engenharia Agrícola e Ambiental

Journal Metrics
- Sobre o periódico
- SciELO Analytics

may 2023, Volume 27 N. 5 Pages 352 - 358

Abstract: En Pt | Text: En Pt | PDF: En | PDF: Pt

ABSTRACT Salinity is one of the major obstacles to agriculture in semi-arid regions, as it affects the physiological processes, growth, and yield of numerous crops. Hence, the application of salt stress attenuators is of paramount importance, as it enables the use of saline water for agricultural purposes. Among these, humic acid promotes the growth as well as water and nutrient uptake of plants. To this end, the present study evaluated the effects of humic acid on the growth and physiology of Carica papaya seedlings irrigated with saline water. The experiment followed the randomized block design with five levels of electrical conductivity (0.5, 1.15, 2.75, 4.35, and 5.0 dS m-1) and five concentrations of humic acid (0.5, 0.94, 2.0, 3.06, and 3.5 mL L-1). Growth, gas exchange, chlorophyll content, and chlorophyll a fluorescence were evaluated. Irrigation with 4.9 dS m-1 water and application of 3.05 mL L-1 humic acid promoted the growth of papaya seedlings. Irrigation with high-salinity water (4.96 and 3.09 dS m-1) coupled with the application of 3.05 and 2.21 mL L-1 humic acid increased internal CO2 concentration, transpiration, instantaneous water use efficiency, carboxylation efficiency, and chlorophyll b content. Overall, humic acid (3.5 mL L-1) attenuated the deleterious effects of salt stress, promoting the growth and improving the performance of papaya seedlings under moderate salinity (4 dS m-1).

RESUMO A salinidade é um dos grandes entraves na agricultura em regiões semiáridas, pois afeta os processos fisiológicos, crescimento e produção de diversas culturas. Assim, o uso de atenuadores do estresse salino é de extrema importância, pois permite o uso de águas salinas para fins agrícolas. Dentre estes, destacam-se os ácidos húmicos que promovem o crescimento e a absorção de água e nutrientes. Assim, o objetivo deste trabalho foi avaliar o efeito do ácido húmico sob o crescimento e a fisiologia de mudas de mamão irrigadas com água salina. O delineamento experimental utilizado foi em blocos casualizados com cinco níveis de condutividade elétrica (0,5; 1,15; 2,75; 4,35 e 5,0 dS m-1), e cinco concentrações de ácido húmico (0,5; 0,94; 2,0; 3,06 e 3,5 mL L-1). Foram avaliados o crescimento, trocas gasosas, índice de clorofilas e fluorescência da clorofila a. A irrigação com água de 4,9 dS m-1 e aplicação de 3,05 mL L-1 de ácido húmico proporcionou maior crescimento das mudas de mamoeiro. A irrigação de mudas de mamoeiro com alta salinidade (4,96 e 3,09 dS m-1) aliada à aplicação de 3,05 e 2,21 mL L-1 de ácido húmico proporcionou aumento da concentração interna de CO2, taxa de transpiração, eficiência instantânea do uso da água, eficiência de carboxilação e teor de clorofila b. O ácido húmico (3,5 mL L-1) atenua os efeitos deletérios da salinidade no mamoeiro, sendo capaz de aumentar o crescimento e melhorar o desempenho das mudas de mamão em salinidade moderada (4 dS m-1).

https://doi.org/10.1590/1807-1929/agriambi.v27n5p352-358

13.

Acclimatization of banana plantlets inoculated with Bacillus sp. and irrigated with low-salinity water
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Rodrigues, Ana J. O.

; Silva, Christiana de F. B. da

; Sousa, Alan B. O. de

; Bezerra, Marlos A.

; Araújo, Beatriz de A.

; Rodrigues, Amadeus M. G.

; Vieira, Júlia Q.

; Sousa, Jhenifer S. de

Revista Brasileira de Engenharia Agrícola e Ambiental

Journal Metrics
- Sobre o periódico
- SciELO Analytics

may 2023, Volume 27 N. 5 Pages 407 - 414

Abstract: En Pt | Text: En Pt | PDF: En | PDF: Pt

ABSTRACT Plant growth-promoting bacteria emerge as an alternative to attenuate abiotic stresses in plants such as salinity. The objective of this study was to evaluate the effects of Bacillus sp. strains 186 and 109 on the acclimatization of banana cv. ‘Prata Catarina’ irrigated with saline water. The experiment was conducted in a completely randomized design in a 4 × 2 factorial scheme, with 4 growth-promotion treatments, subjected to 2 levels of electrical conductivity of irrigation water. Irrigation with saline water decreased the number of leaves, leaf area, transpiration rate, stomatal conductance, and CO2 assimilation rate in banana leaves, regardless of inoculation with bacterial strains. The use of Bacillus sp. strain 109 promoted increments in phosphorus and iron contents in banana plants irrigated with low-salinity water.

RESUMO Bactérias promotoras de crescimento vegetal surgem como alternativa para atenuar estresses abióticos em plantas como a salinidade. O objetivo deste estudo foi avaliar os efeitos do Bacillus sp. cepas 186 e 109 na aclimatização da cv. ‘Prata Catarina’ irrigada com água salina. O experimento foi conduzido em delineamento inteiramente casualizado em esquema fatorial 4 × 2, com 4 tratamentos promotores de crescimento, submetidos a 2 níveis de condutividade elétrica da água de irrigação. Irrigação com água salina diminuiu o número de folhas, a área foliar, a taxa de transpiração, a condutância estomática e a taxa de assimilação de CO2 nas folhas de bananeira, independentemente da inoculação com cepas bacterianas. O uso de Bacillus sp. cepa 109 promoveu incrementos nos teores de fósforo e ferro em bananeiras irrigadas com água de baixa salinidade.

https://doi.org/10.1590/1807-1929/agriambi.v27n5p407-414

14.

Green Synthesis, Characterization and Antibacterial and Leishmanicidal Activities of Silver Nanoparticles Obtained from Aqueous Extract of Eucalyptus grandis
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Oliveira, Lucas M. F.

; Silva, Ueveton P. da

; Braga, João Pedro V.

; Teixeira, Álvaro V. N. C.

; Ribon, Andréa O. B.

; Varejão, Eduardo V. V.

; Coelho, Eduardo A. F.

; Freitas, Camila S. de

; Teixeira, Róbson R.

; Moreira, Renata P L.

Journal of the Brazilian Chemical Society

Journal Metrics
- Sobre o periódico
- SciELO Analytics

apr 2023, Volume 34 N. 4 Pages 527 - 536

Abstract: En | Text: En | PDF: En

This work describes a green synthesis, the characterization, and biological evaluation of silver nanoparticles (AgNPs). The AgNPs suspension was synthesized using aqueous leaf extract of Eucalyptus grandis, which presented a characteristic band at 407 nm in the UV-Vis spectrum. The AgNPs presented a spherical shape and size of 9.7 ± 0.3 nm. The nanoparticles were stable over a month, indicating that E. grandis’ extract is suitable for their preparation and stabilization. The X-ray analysis showed that the crystallinity of AgNPs corresponded to the centered face phase of silver. The antibacterial and leishmanicidal activities of AgNPs were evaluated. The AgNPs presented antibacterial activity on the Gram-negative bacteria Escherichia coli at 53.9 µg mL-1. The leishmanicidal activity evaluation against promastigote forms of Leishmania infantum, Leishmania amazonensis, and Leishmania braziliensis showed that the biological response is dependent on the volume of AgNP suspension. It was demonstrated that L. infantum was more sensitive to the nanoparticle’s treatment than L. amazonensis and L. braziliensis. The treatment of L infantum promastigotes with 150 µL of AgNP suspension reduced parasite growth by 67.9%, a result which was similar to the treatment with 1 (66.7%) or 2 µL (70.6%) of amphotericin B used as a positive control.

https://doi.org/10.21577/0103-5053.20220126

15.

Facile synthesis, structure, and battery-type behavior of graphene oxides
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Silva, J. M. D.

; Fenandes, F. P. M.

; Silva, M. de O.

; Maraschin, T. G.

; Ferreira, L. S.

; Macedo, D. A.

; Silva, L. B. da

; Fim, F. de C.

Cerâmica

Journal Metrics
- Sobre o periódico
- SciELO Analytics

apr 2023, Volume 69 N. 390 Pages 161 - 171

Abstract: En | Text: En | PDF: En

Abstract Graphene oxide (GO) is one of the main precursors for the production of graphene and other graphene-based materials. We report a simple, safe, and fast synthesis method to obtain graphene oxide as a functional material for battery-type electrodes. Washing and lyophilization processes were performed to evaluate their effects on exfoliation and removal of functional groups from graphene sheets. Sample GO1 consisted of a 10-layer stack of oxidized graphene, while sample GO2 had 8 stacked layers. The difference between them was an extra washing and lyophilization process in the GO2 sample. The electrochemical performance of graphene oxide-based electrodes, classified as battery-type, indicated an improved specific capacity of 10.15 C.g-1 for GO1 against 4.55 C.g-1 for GO2 at a specific current of 0.5 A.g-1. This superior battery-type behavior of the GO1 electrode, also confirmed by electrochemical impedance spectroscopy, was most likely due to a higher degree of oxygenated groups on its surface, as shown by energy dispersive spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR) studies.

https://doi.org/10.1590/0366-69132023693903474

Showing

itens per page

Page of 31 Next

Select one or more results

All Alphabetic

Results

Comparative chart Download CSV

Statistics of

Send result

To*

Use ; (semicolon) to insert more emails.

Send to email

This page

Selected records

All references (max. 300)

Your email

Subject

Comments

Export format:

RIS (for EndNote, ProCite, Reference Manager, RefWorks, Citavi, etc.)

BibTeX

Citation

CSV (for Excel, etc)

Export:

This page

Selected itens

All references (max. 2000)

Sem resultados

No documents were found for your search

Glossary and search help

You can enrich your search in a very simple way. Use the search indexes combined with the connectors (AND or OR) and specify more your search.

For example, if you want to search for articles about
cases of dengue in Brasil in 2015, use:
ti:dengue and publication_year:2015 and aff_country:Brasil

See below the complete list of search indexes that can be used:

Index code	Element
ti	article title
au	author
kw	article keywords
subject	subject (title words, abstract and keywords)
ab	abstract
ta	journal short title (e.g. Cad. Saúde Pública)
journal_title	journal full title (e.g. Cadernos de Saúde Pública)
la	publication language code (e.g. pt - Portuguese, es - Spanish)
type	document type
pid	publication identifier
publication_year	publication year of publication
sponsor	sponsor
aff_country	country code of the author's affiliation
aff_institution	author affiliation institution
volume	article volume
issue	article issue
elocation	elocation
doi	DOI number
issn	journal ISSN
in	SciELO colection code (e.g. scl - Brasil, col - Colômbia)
use_license	article usage license code

SciELO - Scientific Electronic Library Online
Rua Dr. Diogo de Faria, 1087 – 9º andar – Vila Clementino 04037-003 São Paulo/SP - Brasil
Email: scielo@scielo.org

All the contents of this site www.scielo.br, except where otherwise noted, is licensed under a Creative Commons Attribution License.
more »