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ABSTRACT Vermiculite mining residues, although of low solubility, contain nutrients such as calcium, magnesium, and potassium at concentrations that allow their agricultural use. Beneficial bacteria can increase the solubility of this waste and its efficiency. The objective of the present study was to evaluate the influence of bio-inoculation of vermiculite residue, associated with cattle manure, on the release of nutrients and initial growth of maize. A completely randomized design was performed in a greenhouse with seven treatments and four replications. The treatments were: T1 - soil without fertilization; T2 - soil fertilized with soluble sources of nutrients (conventional fertilization); T3 - application of vermiculite residue (VR); T4 - VR enriched with cattle manure (CM); T5 - VR + CM with Bacillus subtilis; T6 - VR + CM + B. amyloliquefaciens, and T7 - VR + CM +B. subtilis + B. amyloliquefaciens). Regardless of the use of cattle manure or beneficial microorganisms, vermiculite mining waste increased the availability of Ca and K in the soil, but was not able to match the soluble sources of nutrients. Mining waste associated with cattle manure and beneficial microorganisms (B. subtilis and B. amyloliquefaciens) increased microbial activity and enhanced the release of available calcium for maize. VR increased the growth and the dry mass production of maize compared to the non-fertilized soil, but was consistently inferior to conventional fertilizer.

RESUMO Os resíduos da mineração de vermiculita, embora de baixa solubilidade, contêm nutrientes como cálcio, magnésio e potássio em concentrações que permitem seu uso agrícola. Bactérias benéficas podem aumentar a solubilidade deste resíduo e sua eficiência. Objetivou-se avaliar a influência da bioinoculação do resíduo de vermiculita, associado ao esterco bovino, na liberação de nutrientes e no crescimento inicial do milho. Foi realizado delineamento inteiramente casualizado em casa de vegetação com sete tratamentos e quatro repetições. Os tratamentos foram: T1 - solo sem adubação; T2 - solo adubado com fontes solúveis de nutrientes (fertilização convencional); T3 - aplicação de resíduo de vermiculita (VR); T4 - VR enriquecido com esterco bovino (CM); T5 -VR+CM com Bacillus subtilis; T6 - VR + CM + B. amyloliquefaciens e T7 - VR + CM + B. subtilis + B. amyloliquefaciens). O VR aumentou a disponibilidade de Ca e K no solo, porém seu desempenho foi inferior às fontes solúveis. Independentemente da utilização de esterco bovino ou de microrganismos benéficos, os resíduos da mineração de vermiculita aumentaram a disponibilidade de Ca e K no solo, mas não foram capazes de igualar as fontes solúveis de nutrientes. Os resíduos de mineração associados ao esterco bovino e aos microrganismos benéficos (B. subtilis e B. amyloliquefaciens) aumentaram a atividade microbiana e aumentaram a liberação de cálcio disponível para o milho. Os resíduos da mineração de vermiculita aumentaram o crescimento e a produção de massa seca do milho em comparação ao solo não fertilizado, mas foram consistentemente inferiores ao fertilizante convencional.

https://doi.org/10.1590/1807-1929/agriambi.v28n2e273189

Effect of feeding frequency and water salinization on early development of Pyrrhulina brevis, an Amazonian ornamental fish
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PINHEIRO JUNIOR, Arlindo dos S.

; OLIVEIRA, Leonnan C. C. de

; EIRAS, Bruno José C. F.

; LIMA, Wesley dos S.

; VERAS, Galileu C.

; MOURA, Lorena B. de

; SALARO, Ana L.

; CAMPELO, Daniel A. V.

Acta Amazonica

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jun 2023, Volume 53 N. 2 Pages 107 - 113

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

ABSTRACT Pyrrhulina brevis is an endemic fish from the Amazon basin that is valued in the ornamental fish market. In larviculture, fish are very sensitive to stressors and have a high mortality rate. Salinized water may provide more energy to overcome stress and feeding frequency is an important strategy to improve productive performance. Therefore, the aim of this study was to evaluate the best feeding frequency and the best level of water salinization for larval development of P. brevis. A total of 360 post-larvae of P. brevis (5.26 ± 1.65 mg, 5.57 ± 0.68 mm) were randomly distributed in 36 aquariums (1 L) in a 3x4 factorial scheme, to evaluate three concentrations of salt in water (0, 1 and 2 g L-1) and four feeding frequencies (once, twice, three and four times a day). We offered 150 Artemia nauplii per day and per post-larvae during 15 days. The fish kept at 1 g L-1 salinized water, and those fed 3 and 4 times a day presented significantly greater final length and weight, weight gain, and specific growth rate for length and weight. An interaction between salinized water and feeding frequency was observed for survival rate. We conclude that, during the initial rearing phase of P. brevis, feeding frequency of three times a day and salinized water at 1 g L-1 is recommended.

RESUMO Pyrrhulina brevis é um peixe endêmico da bacia amazônica que apresenta bons valores no mercado de peixes ornamentais. Na larvicultura, os peixes são muito sensíveis aos estressores e apresentam alta taxa de mortalidade. A água salinizada pode fornecer mais energia para superar o estresse e a frequência alimentar é uma estratégia importante para melhorar o desempenho produtivo. Portanto, o objetivo deste trabalho foi avaliar a melhor frequência alimentar e o melhor nível de salinização da água para o desenvolvimento larval de P. brevis. Um total de 360 pós-larvas de P. brevis (5,26 ± 1,65 mg, 5,57 ± 0,68 mm) foram distribuídos aleatoriamente em 36 aquários (1 L) em esquema fatorial 3x4, para avaliar três concentrações de sal na água (0, 1 e 2 g L-1) e quatro frequências de alimentação (uma, duas, três e quatro vezes ao dia). Foram oferecidas 150 náuplios de Artemia por dia e por pós-larva, durante 15 dias. Os peixes mantidos com 1 g L-1 de água salinizada e os alimentados 3 e 4 vezes ao dia apresentaram comprimento e peso finais, ganho de peso e taxa de crescimento específico para comprimento e peso significativamente maiores. Uma interação entre água salinizada e frequência alimentar foi observada para a taxa de sobrevivência. Concluímos que, durante a fase inicial de criação de P. brevis, recomenda-se uma frequência alimentar de três vezes ao dia e água salinizada a 1 g L-1.

https://doi.org/10.1590/1809-4392202200602

Synthesis of 4-(4-chlorophenyl)thiazole compounds: in silico and in vitro evaluations as leishmanicidal and trypanocidal agents
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CRUZ FILHO, IRANILDO JOSÉ DA

; OLIVEIRA, JAMERSON F. DE

; SANTOS, ALINE CAROLINE S.

; PEREIRA, VALÉRIA R.A.

; LIMA, MARIA CARMO A. DE

Anais da Academia Brasileira de Ciências

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2023, Volume 95 N. 1 elocation e20220538

Abstract: En | Text: En | PDF: En

Abstract Neglected tropical diseases are a diverse group of communicable pathologies that mainly prevail in tropical and subtropical regions. Thus, the objective of this work was to evaluate the biological potential of eight 4-(4-chlorophenyl)thiazole compounds. Tests were carried out in silico to evaluate the pharmacokinetic properties, the antioxidant, cytotoxic activities in animal cells and antiparasitic activities were evaluated against the different forms of Leishmania amazonensis and Trypanosoma cruzi in vitro. The in silico study showed that the evaluated compounds showed good oral availability. In a preliminary in vitro study, the compounds showed moderate to low antioxidant activity. Cytotoxicity assays show that the compounds showed moderate to low toxicity. In relation to leishmanicidal activity, the compounds presented IC50 values that ranged from 19.86 to 200 µM for the promastigote form, while for the amastigote forms, IC50 ranged from 101 to more than 200 µM. The compounds showed better results against the forms of T. cruzi with IC50 ranging from 1.67 to 100 µM for the trypomastigote form and 1.96 to values greater than 200 µM for the amastigote form. This study showed that thiazole compounds can be used as future antiparasitic agents.

https://doi.org/10.1590/0001-3765202320220538

Use of Iron Ore Tailing as Raw Material for Two Products: Sodium Silicate and Geopolymers
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Prates, Caroline D.

; Lima, Athos S.

; Ferreira, Igor C.

; Paula, Fabiano G. F. de

; Pinto, Paula S.

; Ardisson, José D.

; Lago, Rochel M.

; Teixeira, Ana Paula C.

Journal of the Brazilian Chemical Society

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2023, Volume 34 N. 6 Pages 809 - 818

Abstract: En | Text: En | PDF: En

In this work, iron ore tailing (IOT) was used for the production of two different materials: sodium silicate and geopolymers. Initially, reactions of IOT with NaOH were carried out by hydrothermal reaction in autoclave at 200 °C (1:1.5 and 1:2.5 SiO2:NaOH molar ratio) and reaction times of 4 and 8 h. X-ray fluorescence by dispersive energy (XRF), X-ray diffraction (XRD), Mössbauer spectroscopy, scanning electron microscopy (SEM-EDS) and titrations showed that IOT:NaOH ratios of 1:2.5 and reaction time 8 h completely dissolved the quartz from the IOT, obtaining a solid fraction consisting mainly of hematite and an aqueous phase of sodium silicate, which showed contents of ca. 23% SiO2 and 19% Na2O. This sodium silicate obtained was then combined with IOT (25 and 50 wt.%) to produce geopolimeric material with excellent physico-chemical properties, fast curing time and very good compressive strength results, which ranged from 41 to 58 MPa and many potential applications.

https://doi.org/10.21577/0103-5053.20220149

Estimation and Mapping of the Received Power Level of Digital Signals TV Using Spatial Interpolation Methods
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Lima, Karoline R.

; Andrade, Humberto D. de

; Sombra, Antônio S. B.

; Sousa, Matheus E. T.

; Lima, José F. de

; Fontgalland, Glauco

; Silva, Isaac B. T. da

Journal of Microwaves, Optoelectronics and Electromagnetic Applications

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jun 2022, Volume 21 N. 2 Pages 305 - 318

Abstract: En | Text: En | PDF: En

Abstract The signal digitization process of the open television system is still in progress, therefore, the study of the digital signal propagation has great importance so that broadcasters can develop and improve the transmission service. The field measurement of digital signal parameters is one of the most reliable means to analyze the signal propagation in a given area. In this work, received power measurements of a TV station digital signal in the city of Mossoró, Rio Grande do Norte, Brazil were performed. The objective is to implement interpolation methods and identify which is the most suitable for the spatial representation of power data in this region through the Mean Error (ME) and Root Mean Squared Error (RMSE) evaluation metrics. A good representation of the received power level contributes to the mapping of greater and lesser intensity of the digital signal in the region. The implementation of the interpolation methods was performed in Surfer® software (Golden Software, LLC), which provides the cross-validation report with the ME and RMSE values associated with each method. The Ordinary Kriging method with exponential variogram model obtained the lowest RMSE value (7.6083) and, therefore, the most adequate estimates.

https://doi.org/10.1590/2179-10742022v21i2258350

Art and science: impact of semioccluded vocal tract exercises and choral singing on quality of life in subjects with congenital GH deficiency
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Andrade, Bruna M. R. de

; Valença, Eugenia H. O.

; Salvatori, Roberto

; Oliveira Neto, Luiz A.

; Souza, Anita H. O.

; Oliveira, Alaíde H. A.

; Oliveira, Mario C.P.

; Melo, Enaldo V.

; Carvalho, Susana de

; Sales, Neuza J

; Monteiro, Gisane C.

; Lima, José Marcel de

; Annunziato, Marcos Felipe Harder

; Mannis, Guilherme Daniel Breternitz

; Souza, Lucas E. de A.

; Goes, Yasmin D.

; Carvalho, Thayza S.

; Farias, Celiane de

; Santos, Michela P. dos

; Cardoso, Gabriela P. F.

; Sousa, Carla S. Pereira

; Santana, Julia Rodrigues

; Sales, Ester Almeida

; d’Avila, Jeferson Sampaio

; Aguiar-Oliveira, Manuel H.

Archives of Endocrinology and Metabolism

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apr 2022, Volume 66 N. 2 Pages 198 - 205

Abstract: En | Text: En | PDF: En

ABSTRACT Objectives: Currently, not much is known about the interactions between voice and growth hormone (GH). We have described large kindred with isolated GH deficiency (IGHD) due to a GHRH receptor mutation, resulting in severe short stature and high-pitched voice. These IGHD individuals have little interest in GH treatment, as they consider themselves “short long-lived people”, rather than patients. Interestingly, they report normal general quality of life, but they rate their Voice-Related Quality of Life (V-RQOL) as low. Here, we assessed the social and auditory-perceptual impacts of artistic-intervention voice therapy with semioccluded vocal tract exercises (SOVTE) and choral singing, on their voices. Material and methods: Seventeen GH-naïve adult IGHD individuals were enrolled in a single-arm interventional pre-post study with 13 weekly sessions of choir singing over 90 days. Outcome measures were V-RQOL scores, self-assessment of voice, and auditory-perceptual analysis (GRBAS scale, G: grade of the severity of dysphonia; R: roughness; B: breathiness; A: asthenia; and S: strain). Results: Marked improvements in total (p = 0.0001), physical (p = 0.0002), and socioemotional (p = 0.0001) V-RQOL scores and in self-assessment of voice (p = 0.004) were found. The general grades of vocal deviation (p = 0.0001), roughness (p = 0.0001), breathiness (p = 0.0001) and strain (p = 0.0001) exhibited accentuated reductions. Conclusions: Voice therapy with semioccluded vocal tract exercises and choral training improved social impact and perceptual voice assessments in IGHD subjects and markedly improved their voice-related quality of life. This is particularly important in a setting where GH replacement therapy is not widely accepted.

https://doi.org/10.20945/2359-3997000000449

Cushing’s syndrome due to ectopic adrenocorticotropin secretion by a parotid carcinoma
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Antonacio, Fernanda F.

; Harada, Guilherme

; Vilela, Rafael S.

; Freitas, Thais C.

; Lima Jr., Jose V.

; Kowalski, Luiz Paulo

; Almeida, Madson Q.

; Castro Junior, Gilberto de

Archives of Endocrinology and Metabolism

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feb 2022, Volume 66 N. 1 Pages 92 - 96

Abstract: En | Text: En | PDF: En

SUMMARY We report a rare case of Cushing’s syndrome in a 37-year-old female who initially presented with localized acinic cell carcinoma of the parotid gland. In January 2014, she underwent a right parotidectomy with facial nerve preservation and adjuvant radiotherapy. In August 2018, she presented a histologically-proven local regional relapse. The patient was considered for salvage surgery with facial nerve sacrifice and remained with no evidence of disease. One year later the patient developed pulmonary dissemination and started to gain weight and developed facial plethora and acne on the face and upper trunk. In a physical examination, the patient presented moon face, buffalo hump, acne and stage 2 hypertension. Biochemical evaluation confirmed ACTH-dependent Cushing’s syndrome. IHC for ACTH in the lung biopsy revealed strong positive staining for ACTH confirming a diagnosis of ectopic ACTH secretion by a metastatic parotid acinic cell carcinoma. Ketoconazole (600 mg/d) was started to treat the CS. In addition, as chemotherapy was initiated to treat the metastatic disease. After the fifth cycle of chemotherapy, ketoconazole was suspended and the patient remained in remission of CS for four months, when CS recurred. A unique feature of this case is related to the clinical CS relapse associated with disease progression, which needed prompt treatment with ketoconazole, resulting in a significant improvement in the patient’s condition. Although rare, should be attentive for possible CS features in patients with high-grade salivary gland carcinomas, since the diagnosis of ectopic secretion of ACTH may significantly impact their management and outcomes.

https://doi.org/10.20945/2359-3997000000426

Differentials in death count records by databases in Brazil in 2010
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Diógenes, Victor Hugo Dias

; Pinto Júnior, Elzo Pereira

; Gonzaga, Marcos Roberto

; Queiroz, Bernardo Lanza

; Lima, Everton E. C.

; Costa, Lilia Carolina C. da

; Rocha, Aline S.

; Ferreira, Andrêa J. F.

; Teixeira, Camila S. S.

; Alves, Flávia Jôse O.

; Rameh, Leila

; Flores-Ortiz, Renzo

; Leyland, Alastair

; Dundas, Ruth

; Barreto, Maurício L.

; Ichihara, Maria Yury Travassos

Revista de Saúde Pública

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2022, Volume 56 elocation 92

Abstract: En | Text: En | PDF: En

ABSTRACT OBJECTIVE To compare the death counts from three sources of information on mortality available in Brazil in 2010, the Mortality Information System (SIM - Sistema de Informações sobre Mortalidade ), Civil Registration Statistic System (RC - Sistema de Estatísticas de Resgistro Civil ), and the 2010 Demographic Census at various geographical levels, and to confirm the association between municipal socioeconomic characteristics and the source which showed the highest death count. METHODS This is a descriptive and comparative study of raw data on deaths in the SIM, RC and 2010 Census databases, the latter held in Brazilian states and municipalities between August 2009 and July 2010. The percentage of municipalities was confirmed by the database showing the highest death count. The association between the source of the highest death count and socioeconomic indicators - the Índice de Privação Brasileiro (IBP – Brazilian Deprivation Index) and Índice de Desenvolvimento Humano Municipal (IHDM – Municipal Human Development Index) - was performed by bivariate choropleth and Moran Local Index of Spatial Association (LISA) cluster maps. RESULTS Confirmed that the SIM is the database with the highest number of deaths counted for all Brazilian macroregions, except the North, in which the highest coverage was from the 2010 Census. Based on the indicators proposed, in general, the Census showed a higher coverage of deaths than the SIM and the RC in the most deprived (highest IBP values) and less developed municipalities (lowest IDHM values) in the country. CONCLUSION The results highlight regional inequalities in how the databases chosen for this study cover death records, and the importance of maintaining the issue of mortality on the basic census questionnaire.

https://doi.org/10.11606/s1518-8787.2022056004282

Differentials in death count records by databases in Brazil in 2010
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Diógenes, Victor Hugo Dias

; Pinto Júnior, Elzo Pereira

; Gonzaga, Marcos Roberto

; Queiroz, Bernardo Lanza

; Lima, Everton E. C.

; Costa, Lilia Carolina C. da

; Rocha, Aline S.

; Ferreira, Andrêa J. F.

; Teixeira, Camila S. S.

; Alves, Flávia Jôse O.

; Rameh, Leila

; Flores-Ortiz, Renzo

; Leyland, Alastair

; Dundas, Ruth

; Barreto, Maurício L.

; Ichihara, Maria Yury Travassos

Revista de Saúde Pública

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2022, Volume 56 elocation 92

Abstract: En | Text: En | PDF: En

https://doi.org/10.11606/s1518-8787.2022056004282

10.

Induction of salt stress tolerance in chives by priming with H2O2 in hydroponic cultivation
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Santos, Bárbara D.B. dos

; Silva, Patrícia F. da

; Matos, Rigoberto M. de

; D. Neto, José

; Lima, Vera L.A. de

; Bonou, Semako I.

; Melo, Alberto S. de

; Melo, Yuri L.

Chilean journal of agricultural research

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sep 2021, Volume 81 N. 3 Pages 317 - 325

Abstract: En | Text: En | PDF: En

ABSTRACT The use of salt stress attenuators is considered an important tool to minimize the deleterious effects of salts. However, its application to chives (Allium schoenoprasum L.) has not been studied. This study aimed to evaluate the induction of salt stress tolerance in chives plants in relation to growth and enzymatic reactions, when subjected to different salinity levels of the nutrient solution, after acclimation of seeds with hydrogen peroxide (H2O2) for 24 h. The experiment was conducted in a greenhouse, where chives seeds were acclimated by H2O2 at concentrations of 0.0, 0.15, 0.30, 0.45 and 0.60 mmol. After germination, the plants were cultivated in hydroponic system with electrical conductivities of 1.0, 2.0, 3.0, 4.0 and 5.0 dS m-1. Plant height, length and number of leaves, H2O2 content, malondialdehyde and catalase (CAT) activity were evaluated in chives plants. The increase in the salinity of the nutrient solution up to 5 dS m-1 reduced by 5.88%, 17% and 9.63% plant height, leaf length and number of leaves, respectively. It was observed that the acclimation of chives seeds with H2O2 at 0.45 mmol g-1 fresh mass in plants that were cultivated in nutrient solution of 3.73 dS m-1 led to maximum CAT activity, minimizing the deleterious effects of nutrient solution salinity on plant growth.

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11.

Artificial neural networks and regression analysis for volume estimation in native species
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Amorim, Lucas M.

; Leite, Elton da S.

; Souza, Deoclides R. de

; Silva, Liniker F. da

; Mello, Carlos R. de

; Lima, José M. de

Revista Brasileira de Engenharia Agrícola e Ambiental

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aug 2021, Volume 25 N. 10 Pages 664 - 669

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

RESUMO O uso de modelos para estimar a produção florestal é uma importante ferramenta em áreas plantadas. Embora esse assunto tenha sido estudado em todo o mundo, ainda falta conhecimento a respeito da medição de volume para locais específicos, como os do Nordeste do Brasil. Desta forma, objetivou-se com este estudo avaliar o potencial de predição de redes neurais artificiais e regressão para a estimativa do volume de madeira em povoamentos homogêneos de Anadantera macrocarpa, Genipa americana e Mimosa caesalpiniflolia. Os métodos de regressão e de redes neurais artificiais (RNAs) mostraram-se aplicáveis para a estimativa do volume individual dos povoamentos em diferentes espaçamentos, aos sete anos de idade. O modelo de regressão de Spurr apresentou melhores resultados estatísticos e dispersão dos erros não tendenciosos para as espécies Anadantera macrocarpa e Genipa americana. Já o modelo de Shumacher-Hall foi mais preciso para a estimativa do volume da espécie Mimosa caesalpinifolia. As RNAs, com dois neurônios na camada intermediária, proporcionaram melhores ajustes para as três espécies, portanto, são recomendadas para estimar os volumes individuais das espécies avaliadas, por mostrar maior precisão, em relação à regressão, na estimativa do volume das espécies nativas avaliadas.

ABSTRACT Modeling is an important tool to estimate forest production in planted areas. Although this issue has been studied worldwide, knowledge regarding volume measurement in specific locations such as Northeast Brazil is still scarce. The present study aimed to evaluated the effectiveness of artificial neural networks (ANNs) and regression analysis in estimating the timber volume of homogeneous stands of Anadantera macrocarpa, Genipa americana, and Mimosa casalpinifolia, in order to better predict the growth and production of these species. Both methods were suitable for estimating the individual volume in 7-year-old stands with different spacing. The Spurr regression model showed better statistical results and dispersion of unbiased errors for Anadantera macrocarpa and Genipa americana, whereas the Shumacher-Hall model provided more accurate volume estimates for Mimosa caesalpinifolia. The ANNs calibrated with two neurons in the middle layer exhibited the best fit for all three species. As such, artificial neural networks can be recommended to estimate the individual volumes of the species analyzed in the study area.

https://doi.org/10.1590/1807-1929/agriambi.v25n10p664-669 2 downloads

12.

Synthesis, in silico Study and Antileishmanial Evaluation of New Selenides Derived from 7-Chloro-quinoline and N-Phenylacetamides
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Huang, Min-Fu N.

; Luis, José A. S.

; Silva, Alison P. da

; Rocha, Juliana C.

; Lima, Tatjana K. S.

; Scotti, Marcus T.

; Scotti, Luciana

; Oliveira, Rafael F. de

; Souza, Helivaldo D. S.

; Athayde-Filho, Petrônio F. de

; Barbosa-Filho, José M.

Journal of the Brazilian Chemical Society

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apr 2021, Volume 32 N. 4 Pages 712 - 721

Abstract: En | Text: En | PDF: En

This study describes a virtual screening performed for two series of selenides (28 compounds), derived from N-phenylacetamides chlorides and 7-chloro-quinoline, to determine their potential for leishmanicidal activity against Leishmania amazonensis and Leishmania donovani. Seven compounds were predicted as potential leishmanicides; therefore, they were synthesized from elemental selenium, as a precursor for the production of NaHSe, and subsequent reactions with 4,7-dichloro-quinoline and N-phenylacetamides chlorides were performed. The compounds were characterized by infrared (IR), 1H and 13C nuclear magnetic resonance (NMR), and sent for in vitro cytotoxicity tests against L. amazonensis and were found to be active and selective, and two compounds presented half-maximal inhibitory concentrations (IC50) of 5.67 and 10.81 µg mL-1. They also presented good interaction energies in the docking study, suggesting that may exert their effects by inhibiting the N-myristoyltransferase and O-acetylserine sulfhydrylase enzymes in parasites.

https://doi.org/10.21577/0103-5053.20200223 183 downloads

13.

Soil fertility and yield of ‘Paluma’ guava fertilized with phosphorus, cattle manure, and boron
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Santos, Gaudêncio P. dos

; Pereira, Walter E.

; Lima, Rosiane de L. S. de

; Brito Neto, José F. de

; Dias, Bruno de O.

; Dias, Thiago J.

Revista Brasileira de Engenharia Agrícola e Ambiental

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apr 2021, Volume 25 N. 4 Pages 228 - 234

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

RESUMO A baixa fertilidade do solo associada à falta de manejo adequado da irrigação são fatores que mais limitam a produção das culturas. Diante disso, objetivou-se avaliar os atributos químicos de um Oxisol e a produtividade da goiabeira ‘Paluma’ sob irrigação com água salina e adubada com fósforo, esterco bovino e boro. Os tratamentos foram distribuídos em blocos ao acaso, com quatro repetições e duas plantas por parcela, incluindo bordaduras nas laterais da área útil experimental, utilizando um esquema fatorial de (5 × 2) + 1, referentes a cinco doses de fósforo (0, 0.08, 0.16, 0.24 e 0.32 kg de P2O5 planta-1), duas doses de esterco bovino, 0 e 30 kg por planta e um tratamento adicional composto por 0.16 kg de P2O5 mais 30 kg de esterco bovino e 1.0 g de boro, utilizando como fonte o bórax. No solo avaliaram-se pH, fósforo, potássio, cálcio, magnésio e a capacidade de troca catiônica nas camadas de 0-20 cm e de 20-40 cm. Nas plantas, estimou-se a produtividade média por hectare em duas safras. O pH diminuiu com as doses de fósforo sem esterco bovino e no tratamento com boro na camada de 20-40 cm. A capacidade de troca catiônica aumentou com aplicação das doses de fósforo associadas ao esterco e diminuiu nas duas camadas do solo com a presença do boro. Os macronutrientes avaliados não foram influenciados pelo boro. As doses de fósforo associadas ao esterco bovino aumentaram a produtividade superando a média de 50 t ha-1 ano-1 determinada para a goiabeira ‘Paluma’, enquanto que o boro não aumentou a produtividade.

ABSTRACT The low soil fertility associated with the lack of adequate irrigation management are factors that most limit crop production. Therefore, the study aimed to evaluate the chemical attributes of an Oxisol and the yield of ‘Paluma’ guava under irrigation with saline water and fertilized with phosphorus, cattle manure, and boron. The treatments were distributed in randomized blocks, with four repetitions and two plants per plot, including borders on the sides of the useful experimental area, arranged in a factorial scheme (5 × 2) + 1, referring to five phosphorus doses (0, 0.08, 0.16, 0.24 and 0.32 kg of P2O5 plant-1), two doses of cattle manure, 0 and 30 kg per plant and an additional treatment consisting of 0.16 kg of P2O5 plus 30 kg of cattle manure and 1.0 g of boron, using as source the borax. In the soil, pH, phosphorus, potassium, calcium, magnesium, and the cation exchange capacity were evaluated in the 0-20 cm and 20-40 cm layers. In plants, the average yield per hectare in two harvests was estimated. The pH decreased with phosphorus doses without cattle manure and in the treatment with boron in the 20-40 cm layer. The cation exchange capacity increased with the application of phosphorus doses associated with manure and decreased in both soil layers with boron. The macronutrients evaluated were not influenced by boron. Phosphorus doses associated with cattle manure increased yield, exceeding the average of 50 t ha-1 year-1 determined for ‘Paluma’ guava. In contrast, boron did not increased the yield.

https://doi.org/10.1590/1807-1929/agriambi.v25n4p228-234 381 downloads

14.

Synthesis, Spectroscopic Characterization, DFT Calculations and Preliminary Antifungal Activity of New Piperine Derivatives
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Souza Jr., Joselito S.

; Martins, Evandro P. S.

; Souza, Helivaldo D. S.

; Oliveira, Rafael F. de

; Alves, Francinara S.

; Lima, Edeltrudes O.

; Cordeiro, Laísa V.

; Trindade, Emmely O.

; Lira, Bruno F.

; Rocha, Gerd B.

; Athayde-Filho, Petronio F. de

; Barbosa-Filho, José M.

Journal of the Brazilian Chemical Society

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mar 2021, Volume 32 N. 3 Pages 490 - 502

Abstract: En | Text: En | PDF: En

Four new piperine derivatives, PC1-PC4, were synthesized, and their structures were fully characterized by infrared (IR) and 1H and 13C nuclear magnetic resonance (NMR) spectroscopies. Quantum chemical calculations were performed using density functional theory (DFT) with the B3LYP-D3/6-31G(d,p) and 6-311+G(2d,p) basis sets. Electronic properties, such as the energy gap between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) and some global chemical reactivity descriptors, were evaluated to study the reactivity and stability of the compounds. 1H and 13C NMR chemical shifts were calculated by using the gauge-invariant atomic orbital (GIAO) method and compared with experimental values. In addition, the compounds were evaluated in an antifungal study against Candida, Trichophyton and Microsporum strains, and only PC4 showed 70% inhibition in ten tested strains, with a minimum inhibitory concentration (MIC) ranging from 1.23-2.46 μmol mL-1 and a minimum fungicide concentration (MFC) ranging from 9.84-19.68 μmol mL-1, and presented a fungistatic effect.

https://doi.org/10.21577/0103-5053.20200203 189 downloads

15.

Antifungal activity and mechanism of action of 2-chloro-N -phenylacetamide: a new molecule with activity against strains of Aspergillus flavus
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FERREIRA, ELBA S.

; CORDEIRO, LAÍSA V.

; SILVA, DANIELE DE F.

; SOUZA, HELIVALDO D.S.

; ATHAYDE-FILHO, PETRÔNIO F. DE

; BARBOSA-FILHO, JOSÉ MARIA

; SCOTTI, LUCIANA

; LIMA, EDELTRUDES O.

; CASTRO, RICARDO D. DE

Anais da Academia Brasileira de Ciências

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2021, Volume 93 elocation e20200997

Abstract: En | Text: En | PDF: En

Abstract Aspergillus genus causes many diseases, and the species Aspergillus flavus is highly virulent. Treatment of aspergillosis involves azole derivatives such as voriconazole and polyenes such as amphotericin B. Due to an increase in fungal resistance, treatments are now less effective; the search for new compounds with promising antifungal activity has gained importance. The aims of this study were to evaluate the effects of the synthetic amide 2-chloro-N-phenylacetamide (A1Cl) against strains of Aspergillus flavus and to elucidate its mechanism of action. Thus, the minimum inhibitory concentration, minimum fungicidal concentration, conidial germination, associations with antifungal agents, cell wall activities, membrane activities and molecular docking were evaluated. A1Cl presented antifungal activity against Aspergillus flavus strains with a minimum inhibitory concentration of between 16 and 256 μg/mL and a minimum fungicidal concentration between 32 and 512 μg/mL. The minimum inhibitory concentration of A1Cl also inhibited conidial germination, but when associated with amphotericin B and voriconazole, it promoted antagonistic effects. Binding to ergosterol on the fungal plasma membrane is the likely mechanism of action, along with possible inhibition of DNA synthesis through the inhibition of thymidylate synthase. It is concluded that the amide 2-chloro-N-phenylacetamide has promising antifungal potential.

https://doi.org/10.1590/0001-3765202120200997 82 downloads

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