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ABSTRACT Papaya cultivation is widespread in Brazil, particularly in the states of Bahia and Espírito Santo, where most commercial plantations are concentrated. Owing to the economic and social importance of papaya, the present study aimed to determine the explanatory variables between the genotypes of two cultivars: Golden (from the Soil group) and Tainung Nº 1 hybrid (from the Formosa group), cultivated under high temperatures and hydric stress. The genotypes containing more desirable agronomic characteristics were identified for use in plant genetic improvement programs. Principal component analysis (PCA) was applied to select the desirable genotypes for Golden and Tainung Nº 1 cultivars based on specific variables analyzed for two groups of variables; for group 1, the plant height, stem diameter, leaf length, leaf width, and leaf number were analyzed, whereas for group 2, the leaf and root dry mass, stem dry mass and fresh mass of 10 discs, fresh mass, and stem and root fresh mass were analyzed. When exposed to hydric and thermal stress, the Tainung Nº 1 cultivar outperformed the Golden cultivar for the evaluation characteristics selected for use in genetic improvement programs.

RESUMO No Brasil, o cultivo do mamão é difundido, principalmente nos estados da Bahia e Espírito Santo, onde se concentra a maior parte dos plantios comerciais. Devido à importância econômica e social do mamão, este estudo teve como objetivo determinar variáveis explicativas entre os genótipos de mamoeiro, cultivados sob altas temperaturas e condições de estresse hídrico, para definir quais contêm características agronômicas mais desejáveis para serem utilizadas em programas de melhoramento genético de plantas. Para isso, a análise de componentes principais foi aplicada para selecionar genótipos desejáveis para as cultivares Golden e Tainung Nº 1, com base em dois grupos de variáveis: grupo 1 - altura da planta, diâmetro do caule, comprimento da folha, largura da folha e número de folhas; e grupo 2 - massa seca da folha, massa seca da raiz, massa seca do caule, massa seca de 10 discos, massa fresca de 10 discos, massa fresca, massa fresca do caule e massa fresca da raiz. A cultivar Tainung Nº 1 do grupo Formosa apresentou vantagens em relação à cultivar Golden, quando submetida a condições de estresse hídrico e térmico para as características de avaliação sendo mais indicada para ser utilizada em programas de melhoramento genético.

https://doi.org/10.1590/1807-1929/agriambi.v27n5p422-428

In vitro germination of passion fruit seeds in the function of tegument removal and culture media
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Faria, Glaucia A.

; Lopes, Beatriz G.

; Suares-Rocha, Paula

; Ferreira, Antonio F. A.

; Maltoni, Katia L.

; Silvério Junior, Luiz H.

; Pigari, Lucas B.

; Felizardo, Lucas M.

; Furlani Júnior, Enes

Revista Brasileira de Engenharia Agrícola e Ambiental

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may 2023, Volume 27 N. 5 Pages 303 - 308

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

ABSTRACT The presence of salts in the culture medium and the addition of phytohormones, necessary to break seed dormancy in the in vitro germination of passion fruit, can induce critical values of osmotic potential. This can change the membrane permeability of seeds, affecting the hydration rate, enzyme release, ion transport, pH, and inhibitor values, which may decrease germination percentage. The aim of this study was to evaluate different types of culture media, composed of other substances, combined with mechanical techniques of tegument removal to determine the most appropriate culture medium for the in vitro germination of Passiflora edulis (Sims flavicarpa Deg.) seeds obtained by open pollination. The experimental design was completely randomized in a 10 × 3 factorial scheme (10 culture media × three types of seed-intact, scarified, and cut), with eight replicates and five seeds per plot. Scarified seeds cultivated in a medium composed of a commercial substrate and gibberellic acid presented a higher percentage of germination than intact or cut seeds cultivated in different concentrations of Murashige & Skoog (MS) medium. Scarification is a satisfactory method for breaking the dormancy of passion fruit seeds, and commercial substrates Bioflora® enriched with gibberellic acid may replace in vitro germination.

RESUMO A presença de sais no meio de cultura e a adição de fitohormônios, necessários para quebrar a dormência das sementes na germinação in vitro do maracujá, podem levar o potencial osmótico a níveis críticos. Isso pode alterar a permeabilidade da membrana das sementes, afetando a taxa de hidratação, a liberação de enzimas, o transporte iônico, o pH e os teores de inibidores, o que pode acarretar na diminuição do percentual de germinação. O objetivo desta pesquisa foi avaliar diversos tipos de meios de cultura, compostos por diferentes substâncias, combinados com técnicas mecânicas de remoção do tegumento, para determinar o tratamento mais adequado para a germinação in vitro de sementes de Passiflora edulis (Sims flavicarpa Deg.) obtidas por polinização aberta. O delineamento experimental foi inteiramente casualizado, em esquema fatorial 10 × 3 (10 meios de cultura × três tipos de sementes - intactas, escarificadas e cortadas), com oito repetições e cinco sementes por parcela. Sementes escarificadas cultivadas em meio composto de substrato comercial e ácido giberélico apresentaram taxa de germinação superior às sementes intactas ou cortadas cultivadas em diferentes concentrações de meio Murashige & Skoog (MS). A escarificação é um método satisfatório de quebra de dormência de sementes de maracujá e substratos comerciais Bioflora® enriquecidos com ácido giberélico podem substituir o meio MS na germinação in vitro.

https://doi.org/10.1590/1807-1929/agriambi.v27n5p303-308

Temporal genetic structure of a stock of Prochilodus lineatus (Characiformes: Prochilodontidae) in the Mogi-Guaçu River ecosystem, São Paulo, Brazil
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Rosa, Ivana F. da

; Oliveira, Daniela J. de

; Cruz, Vanessa P. da

; Ashikaga, Fernando Y.

; Costa, Gabriela Omura

; Doretto, Lucas B.

; Senhorini, José A.

; Rocha, Rita de C.

; Foresti, Fabio P.

; Oliveira, Claudio

; Foresti, Fausto

Neotropical Ichthyology

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2022, Volume 20 N. 2 elocation e210156

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

Resumo Prochilodus lineatus é uma espécie de peixe migratório amplamente distribuído na bacia do rio Paraná, principalmente nos rios Grande, Pardo e Mogi-Guaçu localizados em uma região bem desenvolvida do estado de São Paulo. Este estudo analisou a diversidade genética e a estrutura populacional em cardumes de P. lineatus com base na análise temporal de espécimes amostrados ao longo dos anos de 2003, 2005, 2006, 2009, 2010 e 2015 na Cachoeira de Emas no rio Mogi-Guaçu, São Paulo, Brasil. A análise genética realizada com o marcador D-Loop e sete microssatélites revelou variabilidade genética significativa em todos os grupos amostrados. Níveis moderados de estruturação entre os grupos foram identificados com os marcadores microssatélites (Fst = 0.14), enquanto o marcador mitocondrial não revelou padrões de estruturação genética (Fst = 0.01). A variabilidade genética identificada no estoque oscilou ao longo do tempo, caracterizando padrões de estruturação entre as amostras analisadas. A ocorrência de alterações ambientais resultando em aumento das taxas de mortalidade, bem como mudanças no nível de água no ecossistema, entre outros fatores, podem determinar mudanças no comportamento reprodutivo das espécies. A falta de condições ambientais favoráveis para a reprodução na bacia, pode ter resultado na diferenciação das populações de P. lineatus ao longo do tempo.

Abstract Prochilodus lineatus is a species of migratory fish widely distributed in the Paraná River basin, found mainly in the Grande, Pardo and Mogi-Guaçu rivers located in a well-developed region of the state of São Paulo. This study analyzes the genetic diversity and population structure in shoals of P. lineatus based on temporal analysis of specimens sampled over the years 2003, 2005, 2006, 2009, 2010, and 2015 in the Mogi-Guaçu River, São Paulo, at the region of Cachoeira de Emas. Genetic analysis performed using the D-Loop and seven microsatellite marker revealed significant genetic variability in all sampled groups. Moderate levels of structuring between groups were identified with the microsatellite markers (Fst = 0.14), while the mitochondrial marker did not reveal patterns of genetic structuring (Fst = 0.01). The genetic variability fluctuated over time, characterizing patterns of structuring among the analyzed samples. The occurrence of environmental alterations resulting in increased mortality rates, as well as changes in the water level in the ecosystem, among other factors, could determine changes in the reproductive behavior of species. The lack of favorable environmental conditions for reproduction in the basin, as reflected by tests of population bottlenecks, could have resulted in the differentiation of populations of P. lineatus over time.

https://doi.org/10.1590/1982-0224-2021-0156

DFT, Molecular Docking, and ADME/Tox Screening Investigations of Market-Available Drugs against SARS-CoV-2
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Araújo, Joabe L.

; Sousa, Lucas A. de

; Sousa, Alice O.

; Bastos, Ruan S.

; Santos, Gardênia T.

; Lage, Mateus R.

; Stoyanov, Stanislav R.

; Passos, Ionara N. G.

; Azevedo, Ricardo B. de

; Rocha, Jefferson A.

Journal of the Brazilian Chemical Society

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aug 2021, Volume 32 N. 8 Pages 1628 - 1641

Abstract: En | Text: En | PDF: En

A series of drugs was investigated to determine structural, electronic and pharmacological properties, as well as the molecular affinity for the main protease of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The drugs were submitted to density functional theory calculations to optimize structures and predict binding preferences. The optimized geometries were used in molecular docking simulations. In the docking study, the receiver was considered rigid and the drugs flexible. The Lamarckian genetic algorithm with global search and Pseudo-Solis and Wets with local search were adopted for docking. Absorption, distribution, metabolism, excretion and toxicological properties were obtained from the Pre-ADMET online server. In this series, the antiviral atazanavir showed the potential to inhibit the main protease of SARS-CoV-2, based on the free binding energy, inhibition constant, binding interactions and its favorable pharmacological properties. Therefore, we recommend carrying out further studies with in vitro tests and subsequent clinical tests to analyze its effectiveness in the treatment of SARS-CoV-2.

https://doi.org/10.21577/0103-5053.20210061 130 downloads

Trypanocidal Activity and Increased Solubility of Benznidazole Incorporated in PEG 4000 and Its Derivatives
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Sousa, Lucas R. D.

; Azevedo, Maria Luíza S.

; Rocha, Dayana F.

; Andrade, Ângela L.

; Amparo, Tatiane R.

; Santos, Orlando D. H. dos

; Seibert, Janaína B.

; Pereira, Luciano R.

; Vieira, Paula M. A.

; Carneiro, Cláudia M.

; Barboza, Ana Paula M.

; Neves, Bernardo R. A.

; Sales Jr., Policarpo A.

; Murta, Silvane M. F.

; Novack, Kátia M.

; Santos, Viviane M. R. dos

Journal of the Brazilian Chemical Society

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jun 2021, Volume 32 N. 6 Pages 1162 - 1172

Abstract: En | Text: En | PDF: En

Selecting a polymer depends on its characteristics, the properties of the drug and of the remaining ingredients in the formulation. The drug, when incorporated into a polymeric matrix, can show several advantages when compared with its conventional form. In this context, this work describes the preparation and characterization of polyethylene glycol (PEG 4000) and its derivative particles loaded with benznidazole, as well as evaluates their trypanocidal activity. In this work, reactions to modify the PEG 4000 polymer and the subsequent incorporation of the benznidazole were made. The nuclear magnetic resonance (NMR) analysis confirmed the efficiency in modifying the PEG chains. The morphology of polymeric films was observed by atomic force microscopy (AFM) and showed considerable changes on the film organization. The acetylation of PEG favored the stability of the system and an increase in the zeta potential from ?14.83 to ?25.54 mV was observed. Although encapsulation efficiency values between 30.14 and 39.48% were found, the enhanced benznidazole dissolution profile by microparticles enables the use of lower drug concentrations. This fact can be proven by the increased trypanocidal effect of benznidazole when encapsulated in BP3 microparticles. Finally, the high selectivity of the formulations for trypanocidal action guarantees their safety as an alternative for the treatment of the Chagas disease.

https://doi.org/10.21577/0103-5053.20210017 96 downloads

Percutaneous injection of ethanol for thyroid nodule treatment: a comparative study
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Alcântara-Jones, Daysi Maria de

; Borges, Lucas Moura Bastos

; Nunes, Tania Freitas A.

; Pita, Gabriella Brandão

; Rocha, Vinicius Brito

; Lavinas, Julia Mandaro

; Araújo, Leila Maria Batista

; Adan, Luis Fernando Fernandes

Archives of Endocrinology and Metabolism

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jun 2021, Volume 65 N. 3 Pages 322 - 327

Abstract: En | Text: En | PDF: En

ABSTRACT Objective: Percutaneous ethanol injection (PEI) is an alternative to surgery for the treatment of thyroid nodules (TNs). However, size reductions of treated (TTNs) and untreated TN (UTNs) have not been compared. Volumetric reductions in TTNs with PEI were evaluated by comparing TTNs and UTNs in the same patient, and independent variables predicting good post-PEI outcomes were analyzed. Materials and methods: Overall, 282 patients with multinodular goiters were selected. Two nodules located in different lobes were compared for common disease behaviors. Overall, 150 nodules were selected from 75 patients (6 M: 69 F) with a mean age of 50.1 ± 17.4 years. This prospective nonrandomized intervention study prioritized treating TNs of greater volume or single hyperfunctioning TNs. A single observer experienced in PEI and an ultrasound specialist performed the interventions. Results and discussion: TTNs (mean volume: 14.8 ± 16.2 mL) were reduced by 72.6 ± 27.3% of their initial volume, while UTNs increased by a mean of 365.7 ± 1.403.8% (p < 0.00001). The patients underwent a mean of 4.0 ± 3.1 outpatient PEI sessions without relevant complications. Logistic regression analysis showed that the magnitude of the PEI induced reduction was associated with the number of treatment sessions (p = 0.03, CI [1.1-38.2]) and not with ultrasonographic characteristics of the nodules. Each PEI session increased the rate of TN reduction by a factor of 6.7. Conclusions: PEI is a well-tolerated outpatient procedure that effectively reduces the volume of TNs and is noticeably superior to conservative treatment for all ultrasonographic classifications.

https://doi.org/10.20945/2359-3997000000363 175 downloads

Er3+/Yb3+-Doped GdVO4 Obtained by the Non-Hydrolytic Sol-Gel Route and Potential Application as Up-Conversion Thermometer
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Ferreira, Maria F.

; Sousa, Kalil Z. R. de

; Massarotto, Wagner L.

; Ricci, Emiliane G.

; Faria, Emerson H. de

; Ciuffi, Katia J.

; Sevic, Dragutin

; Rocha, Lucas A.

; Nassar, Eduardo J.

Journal of the Brazilian Chemical Society

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feb 2021, Volume 32 N. 2 Pages 376 - 384

Abstract: En | Text: En | PDF: En

The properties of lanthanides allow them to be used as contrast agents for magnetic resonance imaging, thereby helping to differentiate between tissues, organs, and pathologies more efficiently. Lanthanides contain thermosensitive energy levels that aid identification of cancer and healthy cells. This work investigates the GdVO4 matrix obtained by the non-hydrolytic sol-gel methodology and doped with the lanthanide ions Er3+ and Yb3+ at a 1:1 molar ratio. The efficiency of the optical parameters was analyzed on the basis of the Er3+ green emission after excitation in the infrared region, namely 980 nm. The temperature-dependent fluorescence intensity ratio (FIR) between the thermally coupled Er3+ levels (2H11/2 and 4S3/2 → 4I15/2) was evaluated. The Er3+ emission depended on the laser power. The calculated number of photons was 2 in this case. Temperatures ranging from 298.3 to 374.5 K were assessed, and the sensitivity varied from 1.2 to 1.9% K-1, respectively. The initial temperature was estimated.

https://doi.org/10.21577/0103-5053.20200189 227 downloads

INCORPORAÇÃO DE RODAMINA B EM MEMBRANA DE POLIAMIDA PELO MÉTODO DA ADSORÇÃO
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Sousa, Kalil Z. R. de

; Faria, Emerson H. de

; Marçal, Liziane

; Ciuffi, Katia J.

; Ricci, Emiliane G.

; Rocha, Lucas A.

; Nassar, Eduardo J.

; Silva, Jorge V. L.

; Oliveira, Marcelo F.

; Maia, Izaque A.

Química Nova

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feb 2021, Volume 44 N. 2 Pages 154 - 160

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

We have incorporated rhodamine into polyamide membranes by additive manufacture selective laser sintering technology. Incorporation into 0.5 cm2 membranes was conducted at different pH values and constant temperature of 25 oC. The amounts of incorporated dye were determined by a calibration curve, and analyses showed rhodamine incorporation in the order of 10-6 mol L-1. The absorption spectra of the solutions and membranes after rhodamine incorporation showed maximum absorption at 553 nm and a shoulder at 522 nm, which indicated that a dimer was formed. Photoluminescence presented maximum emission at 575 nm for the sample incorporated with rhodamine in acid pH. The membranes that were treated with acid presented shorter adsorption time and demanded 180 min to reach equilibrium, whereas the non-treated membrane and the membranes that were treated with base required 1440 min to reach equilibrium. Polyamide membrane has proven to be an excellent material for the incorporation of dyes and compounds for application as luminescent sensors.

https://doi.org/10.21577/0100-4042.20170670 134 downloads

DETERMINAÇÃO DE MERCÚRIO EM FÍGADO DE TETRÁPODES MARINHOS POR ESPECTROMETRIA DE FLUORESCÊNCIA ATÔMICA ACOPLADA A GERAÇÃO DE VAPOR FRIO (CV-AFS) E ESPECTROMETRIA DE MASSA COM FONTE DE PLASMA INDUTIVAMENTE ACOPLADO (ICP-MS): UMA COMPARAÇÃO SISTEMÁTICA ENTRE AS DUAS TÉCNICAS
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Silva, Raiza F. da

; Rocha, Siomara D. da

; Menegário, Amauri A.

; Pedrobom, Jorge H.

; Sulato, Everton T.

; Luko, Karen S.

; Elias, Lucas Pellegrini

; Oliveira, Lucia M. de Souza

; Sargentini Junior, Ézio

Química Nova

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jan 2021, Volume 44 N. 1 Pages 64 - 69

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

This study compares the techniques cold vapour atomic fluorescence spectrometry (CV-AFS) and inductively coupled plasma mass spectrometry (ICP-MS) for the determination of Hg in biological samples (hepatic tissue from marine tetrapods). Acid digestions were performed for the samples and aliquots of them were analysed by ICP-MS and CV-AFS. To minimize the Hg memory effect in its determination by ICP-MS, gold (200 µg L-1 in 5% v v-1 HCl) was added to the sample digests. The detection limits were 0.02 mg kg-1 for ICP-MS and 0.01 mg kg-1 for CV-AFS. Accuracy was assessed by the calculation of the recovery obtained from TORT-3 (lobster hepatopancreas) certified reference material analysis. Accurate results were obtained for both CV-AFS and ICP-MS. The comparison of the results obtained for hepatic tissue with and without lyophilization showed a significant difference among them (at 95% of confidence level), evidencing losses of Hg in the lyophilization process.

https://doi.org/10.21577/0100-4042.20170675 243 downloads

10.

Atualização das Diretrizes Brasileiras de Valvopatias – 2020
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Tarasoutchi, Flavio

; Montera, Marcelo Westerlund

; Ramos, Auristela Isabel de Oliveira

; Sampaio, Roney Orismar

; Rosa, Vitor Emer Egypto

; Accorsi, Tarso Augusto Duenhas

; Santis, Antonio de

; Fernandes, João Ricardo Cordeiro

; Pires, Lucas José Tachotti

; Spina, Guilherme S.

; Vieira, Marcelo Luiz Campos

; Lavitola, Paulo de Lara

; Ávila, Walkiria Samuel

; Paixão, Milena Ribeiro

; Bignoto, Tiago

; Togna, Dorival Júlio Della

; Mesquita, Evandro Tinoco

; Esteves, William Antônio de Magalhães

; Atik, Fernando

; Colafranceschi, Alexandre Siciliano

; Moises, Valdir Ambrósio

; Kiyose, Alberto Takeshi

; Pomerantzeff, Pablo M. A.

; Lemos, Pedro A.

; Brito Junior, Fabio Sandoli de

; Weksler, Clara

; Brandão, Carlos Manuel de Almeida

; Poffo, Robinson

; Simões, Ricardo

; Rassi, Salvador

; Leães, Paulo Ernesto

; Mourilhe-Rocha, Ricardo

; Pena, José Luiz Barros

; Jatene, Fabio Biscegli

; Barbosa, Márcia de Melo

; Abizaid, Alexandre

; Ribeiro, Henrique Barbosa

; Bacal, Fernando

; Rochitte, Carlos Eduardo

; Fonseca, José Honório de Almeida Palma da

; Ghorayeb, Samira Kaissar Nasr

; Lopes, Marcelo Antonio Cartaxo Queiroga

; Spina, Salvador Vicente

; Pignatelli, Ricardo H.

; Saraiva, José Francisco Kerr

Arquivos Brasileiros de Cardiologia

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oct 2020, Volume 115 N. 4 Pages 720 - 775

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

https://doi.org/10.36660/abc.20201047 17824 downloads

11.

Occurrence of Ahasverus advena (Coleoptera: Silvanidae) in corn grains from the city of Plácido de Castro, state of Acre, Brazil
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Sousa, Adalberto Hipólito de

; Teixeira Júnior, Davair Lopes

; Rocha, Josilene Ferreira

; Lopes, Lucas Martins

Arquivos do Instituto Biológico

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2020, Volume 87 elocation e0842019

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

RESUMO Ahasverus advena (Coleoptera: Silvanidae) é uma praga secundária de grãos armazenados. É uma espécie polifágica e cosmopolita, com poucas informações sobre sua ocorrência na região norte do Brasil. Este estudo tem o objetivo de relatar a primeira ocorrência de A. advena em grãos de milho na cidade de Plácido de Castro, Acre, Brasil. Em junho de 2019, observou-se a presença de A. advena desenvolvendo em uma massa de grãos de milho. A identificação foi feita a nível de espécie com a utilização das chaves dicotômicas disponíveis. Como este é o primeiro registro de A. advena em grãos de milho na cidade de Plácido de Castro, o monitoramento dos insetos na massa de grãos de milho é necessário para evitar danos econômicos causados por A. advena nos grãos.

ABSTRACT Ahasverus advena (Coleoptera: Silvanidae) is a secondary pest of stored grains. It is a polyphagic and cosmopolitan species, with little information about its occurrence in the northern region of Brazil. This study was conducted to report the first occurrence of A. advena in corn grains in the city of Plácido de Castro, in the state of Acre, Brazil. In June 2019, the presence of A. advena under development was observed in a mass of corn grains. The identification was made at the species level using the available dichotomous keys. Since this is the first record of A. advena in corn grains in the city of Plácido de Castro, monitoring insects in the mass of corn grains is necessary to prevent the economic damages caused by A. advena to grains.

https://doi.org/10.1590/1808-1657000842019 558 downloads

12.

Cr3+ Doped Al2O3 Obtained by Non-Hydrolytic Sol-Gel Methodology
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Caiut, José M. A.

; Floch, Nolwen

; Messaddeq, Younès

; Lima, Omar J. de

; Rocha, Lucas A.

; Ciuffi, Katia J.

; Nassar, Eduardo J.

; Friedermann, Geraldo R.

; Ribeiro, Sidney J. L.

Journal of the Brazilian Chemical Society

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apr 2019, Volume 30 N. 4 Pages 744 - 751

Abstract: En | Text: En | PDF: En

This paper reports the synthesis and characterization of Cr3+-doped alumina by the sol-gel non-hydrolytic methodology. The resulting sample was treated at different temperatures. X-ray diffraction revealed that the ruby phase emerged in the sample treated at 1100 ºC, which was later confirmed by absorption bands correspondent to Cr3+ ions allowed transitions at 4A2 → 4T1, 4T2, and forbidden at 4A2 → 2T1, 2E, observed by diffuse reflectance UV-Vis. The luminescence spectroscopy showed the intensity band at 694 nm in red region, characterized of the Cr3+ ion. The peaks at 702 and 705 nm correspond to N1 and N2 lines, respectively, which arose from the second and fourth nearest-neighbor exchange-coupled pairs of chromium(III) ion, respectively, ascribed to high chromium(III) concentration. The Cr3+ cluster formation was observed in electron paramagnetic resonance signal as discussed in this work. Nuclear magnetic resonance evidenced that the 27 Al symmetry changed in the samples treated between 900 and 1100 ºC.

https://doi.org/10.21577/0103-5053.20180195 1275 downloads

13.

Nutrient accumulation in Eucalyptus bark at different population densities
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Martins, Thales G. V.

; Rocha, Maria F. V.

; Nieri, Erick M.

; Melo, Lucas A. de

; Silva, Maria L. de S.

; Silva, Diana S. N. da

Revista Brasileira de Engenharia Agrícola e Ambiental

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jan 2019, Volume 23 N. 1 Pages 40 - 46

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

RESUMO Objetivou-se neste trabalho quantificar o acumulo de nutrientes na casca de quatro clones de eucalipto, aos 12 anos, plantados em diferentes densidades populacionais, extrapolando os valores para kg de nutrientes por hectare. O delineamento experimental foi em blocos casualizados, em arranjo fatorial 4 x 3 com três repetições, sendo quatro clones de eucalipto (2486, I182, I144 e GG100), plantados em três densidades populacionais (416, 833 e 1111 plantas por hectare). A cubagem rigorosa de três árvores por parcela foi realizada por meio da coleta de discos de casca nas seguintes alturas: diâmetro à altura do peito (1,30 m), 0, 25, 50, 75 e 100% da altura comercial do fuste. Os discos de casca de cada árvore foram agrupados e utilizados para determinar os teores de N, P, K, Ca, Mg e S, além da densidade básica. O volume e a massa seca de casca por árvore foram estimados e o acúmulo de nutrientes por árvore e hectare foi estimado sequencialmente, para cada densidade populacional. Os valores encontrados foram submetidos à análise de variância e ao teste de Tukey, verificando que o Ca foi o nutriente que apresentou o maior acúmulo na casca, seguido do N, K, S, Mg e P. O aumento da densidade populacional contribuiu para uma maior produção de casca e maior acúmulo de nutrientes por hectare. Entretanto, esse aumento não foi evidente ao comparar as densidades de 833 e 1111 árvores ha-1.

ABSTRACT The objective of this study was to quantify the accumulation of nutrients in the bark of four eucalyptus clones at 12 years-of-age, planted at different population densities, and the values were extrapolated to kg of nutrients per hectare. The experiment used randomized blocks in a 4 × 3 factorial design and three replications, with four Eucalyptus clones (2486, I182, I144, and GG100) planted at three population densities (416, 833, and 1111 trees ha-1). The rigorous cubage of three trees per plot was performed by collecting discs of bark at the following heights: diameter at breast height (1.30 m), 0, 25, 50, 75, and 100% of the commercial height of the stem. The bark discs of each tree were grouped and used to determine N, P, K, Ca, Mg, and S content, in addition to the basic density. The volume and dry mass of bark per tree was estimated and the accumulation of nutrients per tree ha-1 was estimated sequentially, for each population density. Analysis of variance and Tukey’s post-hoc tests verified that Ca showed the greatest accumulation in the bark, followed by N, K, S, Mg, and P. The increase in population density contributed to higher bark production and greater nutrient accumulation per hectare. However, this increase was not evident when comparing densities of 833 and 1111 trees ha-1.

https://doi.org/10.1590/1807-1929/agriambi.v23n1p40-46 573 downloads

14.

EFEITO DA CONCENTRAÇÃO DOS ÍONS Eu3+ E Bi3+ NAS PROPRIEDADES FOTOLUMINESCENTE DA MATRIZ DE YVO4
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Matos, Marcela G.

; Faria, Emerson H. de

; Ciuffi, Katia J.

; Rocha, Lucas A.

; Nassar, Eduardo J.

; Verelst, Marc

Química Nova

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aug 2018, Volume 41 N. 8 Pages 849 - 856

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

Inorganic matrices have been extensively studied for several applications, mainly doped with lanthanoid ions presenting special spectroscopic properties. The radiation emission can be affected by several factors, such as; matrix, synthesis methodology, activating ions and sensitizers, and concentrations. Thus, in this work the matrix of yttrium vanadate doped with Eu3+ ions as activator and Bi3+ ions as sensitizer was prepared by the non-hydrolytic sol-gel methodology. Europium (III) and Bismuth (III) ions concentrations were varied in 1, 3 and 5% in mol with respect to the Y3+ ion and the samples were heat treated at 1000 °C. The X-ray diffraction analyzes showed a single phase of the yttrium vanadate matrix, indicating the non-influence of the dopant ions on the crystalline structure. The dopants concentrations presented influences on the spectroscopic properties of the emitting ion, the intensity parameters (Ω2 e Ω4), increased as a function of the increase of Bi3+ concentration, affecting the covalence of the bond and the rigidity of the system. The increase of Eu3+ concentration directly affected its environment, decreasing the symmetry and increasing the quantum efficiency. Finally, increasing the dopant ions promoted the decreasing the crystallite size.

https://doi.org/10.21577/0100-4042.20170251 675 downloads

15.

ÓXIDO DE ÍTRIO E ALUMÍNIO DOPADO COM Yb3+ E Er3+ INCORPORADO EM MEMBRANA DE POLIAMIDA
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Souza, Michel L. de

; Moscardini, Susane B.

; Faria, Emerson H. de

; Ciuffi, Katia J.

; Rocha, Lucas A.

; Nassar, Eduardo J.

; Silva, Jorge V. L.

; Oliveira, Marcelo F.

; Maia, Izaque A.

Química Nova

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may 2018, Volume 41 N. 5 Pages 519 - 527

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

Lanthanide ions have special light emission, which can occur through descending and ascending energy conversion. Ascending energy conversion is especially interesting for bioapplications because excitation in the infrared region does not excite biomolecules and therefore does not interfere in detection, not to mention that it penetrates deeper in the skin. Here, we synthesized yttrium and aluminum oxide doped with Yb3+and Er3+ions via the non-hydrolytic sol-gel methodology. The doped matrix was incorporated and dispersed over a polyamide membrane obtained by Additive Manufacturing. X-ray diffraction revealed that a mixture of yttrium aluminum monoclinic and garnet phases emerged. Upon excitation at 980 nm in the Yb3+ion, the Er3+ presented more intense emission as a function of the laser power, which favored red emission. The intensities of the bands corresponding to the 4S3/2 → 4I15/2 (563 nm) and 5F9/2 → 4I15/2 (660 nm) transitions involved the absorption of two photons. The oxide incorporated into the polyamide membrane presented the same behavior. After coating with polyetherimide, the latter system was resistant to 5.1 W laser, which paves the way for new applications.

https://doi.org/10.21577/0100-4042.20170201 640 downloads

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