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A new tropical species of Aphyllon (Orobanchaceae: Orobancheae) from Chiapas, Mexico
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Francisco-Gutiérrez, Antonio

; Alvarado-Cárdenas, Leonardo O.

Botanical Sciences

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dec 2023, Volume 101 N. 4 Pages 1174 - 1183

Abstract: Es En | Text: Es En | PDF: Es | PDF: En

Resumen Antecedentes: Aphyllon es un género de 25 especies holoparásitas de raíces restringidas a América. Posee distribución disyunta, con 21 especies distribuidas en Norteamérica y cuatro en Sudamérica. Aphyllon se divide en dos secciones: Aphyllon y Nothaphyllon. Las especies del género tienen especificidad de hospederos, convirtiéndolas en un modelo de estudio de la evolución de plantas holoparásitas. Recientemente, fueron encontradas observaciones en iNaturalist de una posible nueva especie de Aphyllon. Preguntas: ¿Las observaciones de Aphyllon mencionadas de iNaturalist se sustentan como una especie nueva? ¿Qué caracteres permiten distinguirla de otras especies de Aphyllon? Especies estudiadas: Taxones de Aphyllon sección Nothaphyllon. Sitios y años de estudio: México; 2020-2023. Métodos: Especímenes del taxón fueron colectados, disectados, medidos, fotografiados y preservados. Se revisaron ejemplares de herbarios y literatura de Aphyllon para su determinación y se realizaron comparaciones con especies de la sección Nothaphyllon. Resultados: Se describe e ilustra una nueva especie holoparásita de Aphyllon (Orobanchaceae) siendo la única especie de la sección con racimos con bocas de corola estrechadas a casi cerradas y lóbulos del labio inferior rectos y no revolutos. Es la segunda especie de vegetación tropical húmeda en México, un tipo de vegetación atípico para el género. Conclusiones: Los registros en ciencia ciudadana han resultado útiles para ilustrar la morfología y color de los organismos, así como proponer nuevas especies de Aphyllon. Las fotografías proporcionan información que se pierde en los especímenes de herbario por la oxidación y decoloración que se producen al secar las plantas de Orobanchaceae.

Abstract Background: Aphyllon is a genus of 25 root-holoparasitic species restricted to the Americas. It has a disjunct distribution, with 21 species distributed in North America and four in South America. Aphyllon is divided into two sections: Aphyllon and Nothaphyllon. All species of the genus have host-specificity, make it a study model in the evolution of holoparasitic plants. Recently, observations of a putative new species of Aphyllon were detected on iNaturalist. Questions: Are the alluded iNaturalist observations of Aphyllon supported as a new species? What characters distinguish this taxon from the other species of Aphyllon? Studied species: Taxa of Aphyllon section Nothaphyllon. Study site and dates: Mexico; 2020-2023. Methods: Specimens were collected, dissected, measured, photographed and preserved. Herbarium specimens and literature on Aphyllon were reviewed. Comparisons of the taxon with species of section Nothaphyllon’s were performed. Results: A new species of the holoparasitic Aphyllon (Orobanchaceae) is described and illustrated. It is the second species of tropical humid vegetation in Mexico, an atypical environment for most of the genus, and it is the only species of the section with racemes with narrowed to nearly closed corolla mouths, and straight, non-revolute lobes of the lower lip. Conclusions: The records in the citizen science platform have been useful to illustrate the morphology and color of the organisms, as well as to propose new species of Aphyllon. The photographs provide information not found in herbarium specimens due to oxidation and discoloration that occurs when drying Orobanchaceae plants.

https://doi.org/10.17129/botsci.3293

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

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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

Solvatochromism and Thermochromism of Fluconazole: An Experimental and Theoretical Study
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Olivares, Fernando G.

; Lazcano, Francisco G.

; Castillo, Marcelo O.

; Barúa, Maria G.

; Escalada, Juan P.

; Vitorino, Graciela Pinto

Journal of the Brazilian Chemical Society

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oct 2023, Volume 34 N. 10 Pages 1380 - 1397

Abstract: En | Text: En | PDF: En

This research aims to study fluconazole (FNZ)-solvent interactions in pure solvents through theoretical and experimental solvatochromism. This study showed a bathochromic shift as the polarity of the solvent increases, where the excited state of FNZ is of higher polarity and lower energy than that of the ground state. The multiparametric statistical analysis highlighted solvent polarizability, dispersion, and electronic induction as solvent parameters of great importance, with the basicity of solvent and hydrogen bond acceptor capacity as having certain relevance. The thermochromic effect was also determined by exposing the three pKa values of FNZ. In conclusion, this study shows the importance of the π-π stacking interaction of the FNZ dihalogenated phenyl ring, the solvent basicity for the hydroxyl group, and its acidity for the N4’ of one of the triazoles stand out, as well as the acid-base equilibria involving the -OH group and the two N4’.

https://doi.org/10.21577/0103-5053.20230050

Repellent activity of essential oils against mediterranean fly and their effects on postharvest quality in paluma guava
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Gonzaga, Kennedy S.

; de Brito, Carlos H.

; Salustino, Angélica da S.

; de Souza, Maria Í. A.

; Santos, João P. de O.

; Sousa, Francisco de A. R. da M.

Revista Caatinga

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jun 2023, Volume 36 N. 2 Pages 280 - 290

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

ABSTRACT Brazil is one of the world's largest guava (Psidium guajava) producing countries, but the economic performance of this crop can be negatively affected by the damage caused by Ceratitis capitata (Diptera: Tephritidae). The main methods for controlling C. capitata are based on broad-spectrum insecticide applications. However, the negative effects of using this control method stimulate the development of sustainable alternatives, such as the use of essential oils (EO). In this sense, the objective of the present study was to evaluate the repellent activity of EO of citronella (Cymbopogon nardus), clove (Syzygium aromaticum), and copaiba (Copaifera officinalis) for repellency of C. capitata in Paluma guava fruits and determine their effects on postharvest fruit quality, under laboratory-controlled conditions. The fruits were treated with citronella, clove, and copaiba EO and placed in covered plastic containers attached to the ends of arenas of 20 cm diameter and 15 cm height. The fruit physical and chemical analysis was carried out based on the same oils applied in the repellent test. The C. nardus essential oil presented a greater repellency of C. capitata females. The EO applications proved to be a good strategy for maintaining the fruit post-harvest quality.

RESUMO O Brasil está entre os maiores produtores mundiais de goiaba (Psidium guajava), mas o rendimento econômico dessa cultura pode ser negativamente afetado pelos danos causados por Ceratitis capitata (Diptera: Tephritidae). Os principais métodos de controle de C. capitata são baseados em aplicações de inseticidas de amplo espectro. Porém, os efeitos negativos do uso desse controle estimulam o desenvolvimento de alternativas sustentáveis, como o uso de óleos essenciais. Nesse sentido, o presente estudo teve como objetivo avaliar a atividade repelente dos óleos essenciais de citronela (Cymbopogon nardus), cravo (Syzygium aromaticum) e copaíba (Copaifera officinalis) em fruto de goiabeiras Paluma contra C. capitata e determinar suas influências na qualidade pós-colheita desses frutos trabalhados. Em condições controladas de laboratório, os frutos foram tratados com óleos essenciais de citronela, cravo e copaíba e acondicionados em recipientes de plástico com dimensões de 20 cm de diâmetro e 15 cm de altura. A análise físico-química dos frutos foi realizada com base nos mesmos óleos aplicados no teste de repelência. O óleo essencial de C. nardus apresentou maior repelência às fêmeas de C. capitata. A aplicação de óleos essenciais, mostrou-se uma estratégia para manutenção da qualidade póscolheita.

https://doi.org/10.1590/1983-21252023v36n205rc

Effect of drying conditions on physiological quality of cowpea seeds of the cultivar brs-tumucumaque
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Assis, Miquéias de O.

; Araujo, Eduardo F.

; de Freitas, Francisco C. L.

; da Silva, Laercio J.

; Araujo, Roberto F.

Revista Caatinga

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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

Preferencia de oviposición de Orius insidiosus (Hemiptera: Anthocoridae) en plantas herbáceas
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Quiroz-Medina, Conrado Ronaldo

; Real-Baca, Carlos Iván

; Silva-Illescas, Pedro Fernando

; Moreno-Mayorga, Luis Francisco

Agronomía Mesoamericana

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apr 2023, Volume 34 N. 1 elocation 50410

Abstract: Es En | Text: Es En | PDF: Es | PDF: En

Resumen Introducción. Orius insidiosus es un insecto omnívoro con estrategia de oviposición endófita, con preferencia de oviposición en plantas que garanticen refugio y alimento. Objetivo. Evaluar tres especies vegetales como sitio de oviposición de O. insidiosus en Phaseolus vulgaris (Fabaceae), Ipomoea batata (Convolvulaceae) y Portulaca oleracea (Portulacaceae). Materiales y métodos. El trabajo se realizó en el 2020, en el Centro de Investigación y Reproducción de Controladores Biológicos de la Universidad Nacional Autónoma de Nicaragua, León, Nicaragua. Se usaron esquejes de 15 cm de longitud de tres plantas para hembras de O. insidiosus como sustratos de oviposición: Portulaca oleracea L., Phaseolus vulgaris L., y Ipomoea batatas (L.) Lam. La unidad experimental (n= 90) consistió en esquejes tiernos de 15 cm de longitud, colocados de forma individual en tazas de polietileno, con treinta repeticiones por tratamiento, mediante la técnica de no elección. En cada esqueje se colocó una pareja de O. insidiosus. Cada 24 h se inspeccionaron los esquejes para contabilizar las posturas de huevos. Luego, los esquejes se removieron y revisaron durante cinco días para contabilizar la eclosión de las ninfas, se determinó el peso final del esqueje. Resultados. En los esquejes de P. oleracea se observaron los valores de postura más altos con 5,90 huevos/día por esqueje, seguido por L. batatas con 4,10 huevos/día y por último, P. vulgaris con 2,13 huevos/día. Se evidenció una variabilidad en la postura según el peso inicial y final. Los valores de eclosión fueron menores referentes a los de postura, P. oleracea obtuvo el mayor promedio de eclosión con cuatro individuos seguido por I. batatas con 1,5 y P. vulgaris con 0,8. Conclusiones. P. oleracea presentó mejor preferencia para O. insidiosus con respecto a postura de huevo y eclosión de ninfa. Podría validarse en campo como una estrategia de control biológico.

Abstract Introduction. Orius insidiosus is an omnivorous insect with an endophytic oviposition strategy, with a preference for oviposition on plants that guarantee shelter and food. Objective. To evaluate three plant species as oviposition sites for O. insidiosus on Phaseolus vulgaris (Fabaceae), Ipomoea batata (Convolvulaceae) and Portulaca oleracea (Portulacaceae). Materials and methods. The work was carried out in 2020, at the Center for Research and Reproduction of Biological Controllers of the Universidad Autónoma de Nicaragua, León, Nicaragua, León. Cutting 15-cm-long from three plants for O. insidiosus females were used as oviposition substrates: Portulaca oleracea L., Phaseolus vulgaris L., and Ipomoea batatas (L.) Lam. The experimental unit (n= 90) consisted of 15 cm long tender cuttings, individually placed in polyethylene cups using thirty replicates per treatment, using the no-choice technique. One pair of O. insidiosus was placed on each cutting. Every 24 h the cuttings were inspected to count the egg laying. Subsequently, the cuttings were removed and checked for five days to count nymphs hatching, and the final weight of the cutting was determined. Results. The highest laying values in P. oleracea cuttings with 5.90 eggs/day per cutting, followed by I. batatas with 4.10 eggs/day, and finally P. vulgaris with 2.13 eggs/day. There was evidence of variability in the posture according to the initial and final weight. The hatching values were lower than those of laying, P. oleracea had the highest hatching average with 4 individuals, followed by I. batatas with 1.5, and P. vulgaris with 0.8. Conclusions. P. oleracea showed a better preference for O. insidiosus regarding egg laying and nymph hatching. It could be validated in the field as a biological control strategy.

https://doi.org/10.15517/am.v34i1.50410

Long-Standing Misidentification of Rhinella icterica (Spix, 1824) Specimens From Paraguay
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Caballero-Gini, Andrea

; Brusquetti, Francisco

; Martínez, Nicolás

; Pereyra, Martín O.

; Baldo, Diego

Revista latinoamericana de herpetología

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mar 2023, Volume 6 N. 1 elocation e596

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

Resumen En este trabajo reanalizamos especímenes de Paraguay asignados a la especie Rhinella icterica provenientes de los departamentos de Canindeyú y Amambay ubicados en la ecorregión del Cerrado. En base a la evaluación de caracteres morfológicos externos concluimos que los mismos deben ser asignados a la especie Rhinella cerradensis. Por otro lado, consideramos que no hay evidencia de que la especie R. icterica se encuentre en el país.

Abstract In this work, we reanalyzed specimens from Paraguay assigned to the species Rhinella icterica from the departments of Canindeyú and Amambay located in the Cerrado ecoregion. Based on the evaluation of external morphological characters, we conclude that they should be assigned to the species Rhinella cerradensis. On the other hand, we consider that there is no evidence that R. icterica is present in the country.

Resumo Neste trabalho reanalisamos espécimes do Paraguai atribuídos à espécie Rhinella icterica dos departamentos de Canindeyú e Amambay localizados na ecorregião do Cerrado. Com base na avaliação dos caracteres morfológicos externos, concluímos que eles devem ser atribuídos à espécie Rhinella cerradensis. Por outro lado, consideramos que não há evidências de que a espécie R. icterica seja encontrada no país.

https://doi.org/10.22201/fc.25942158e.2023.01.596

Maximizing agro-bioeconomic benefits in intercropped systems of radish and lettuce in the semi-arid environment
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Lino, Francisca K. K. da S.

; Bezerra Neto, Francisco

; Santos, Elizangela C. dos

; Lima, Jailma S. S. de

; Chaves, Aridênia P.

; Rodrigues, Gardênia S. de O.

; Guerra, Natan M.

; Silva, Ítalo N.

; Lino, Vitor A. da S.

Revista Brasileira de Engenharia Agrícola e Ambiental

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feb 2023, Volume 27 N. 2 Pages 121 - 131

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

RESUMO O rabanete e a alface são duas hortaliças que podem ser consorciadas, porque são culturas companheiras que se complementam. Assim, este estudo teve como objetivo avaliar retornos agro-bioeconômicos advindos do consórcio rabanete-alface em diversas quantidades equitativas de biomassa de jitirana (Merremia aegyptia) e flor-de-seda (Calotropis procera) em diferentes densidades populacionais de alface, em ambiente semiárido. O delineamento experimental utilizado foi em blocos ao acaso, com os tratamentos dispostos em esquema fatorial 4 × 4, com quatro repetições. O primeiro fator consistiu em quantidades equitativas de biomassa de M. aegyptia e C. procera nas doses de 20, 35, 50 e 65 Mg ha-1 em base seca. O segundo fator compreendeu quatro densidades populacionais de alface de 150, 200, 250 e 300 mil plantas ha-1. As cultivares de alface e rabanete plantadas foram ‘Tainá’ e ‘Crimson Gigante’, respectivamente. Retornos agro-bioeconômicos expressivos deste consórcio de rabanete-alface foram obtidos na razão equivalente de terra (RET) de 2,25, escore da variável canônica Z de 3,00 e na renda liquida (RL) de 52.270,48 R$ ha-1, respectivamente, na quantidade de biomassa de 65 Mg ha-1 dos adubos verdes e densidade populacional de alface de 300 mil plantas ha-1. Além disso, registrou-se também um índice de eficiência produtiva (IEP) de 0,96 e uma razão competitiva (RC) de 2,61 na quantidade de biomassa dos adubos de 65 Mg ha-1 e densidade de alface de 150 mil plantas ha-1. A utilização de biomassa de M. aegyptia e C. procera do bioma Caatinga, mostrou-se uma tecnologia viável para produtores que praticam o cultivo de rabanete e alface em consórcio em ambiente semiárido.

ABSTRACT Radish and lettuce are two crop vegetables that can be intercropped because they are companion cultures that complement each other. Thus, this study aimed to evaluate agro-bioeconomic returns arising from radish-lettuce intercropping in different equitable amounts of hairy woodrose (Merremia aegyptia) and roostertree (Calotropis procera) biomass at different population densities of lettuce, in the semi-arid environment. The experimental design was in randomized blocks, with treatments arranged in a 4 × 4 factorial scheme with four replicates. The first factor consisted of equitable amounts of M. aegyptia and C. procera biomass at doses of 20, 35, 50, and 65 Mg ha-1 on a dry basis. The second factor comprised four lettuce population densities of 150, 200, 250, and 300 thousand plants ha-1. The lettuce and radish cultivars planted were ‘Tainá’ and ‘Crimson Gigante’, respectively. Expressive agro-bioeconomic returns from this radish-lettuce intercropping were obtained in the land equivalent ratio (LER) of 2.25, a score of the canonical variable Z of 3.00, net income (NI) of 52,270.48 R$ ha-1, respectively, in the biomass amount of 65 Mg ha-1 of the green manures and lettuce population density of 300 thousand plants ha-1. Also, there was a productive efficiency index (PEI) of 0.96 and a competitive ratio (CR) of 2.61 in the biomass amount of green manure of 65 Mg ha-1 and lettuce density of 150 thousand plants ha-1. Using M. aegyptia and C. procera biomass from the Caatinga biome proved to be a viable technology for producers who practice the cultivation of radish and lettuce in intercropping in the semi-arid environment.

https://doi.org/10.1590/1807-1929/agriambi.v27n2p121-131

Use of hydrogen peroxide in acclimatization of melon to salinity of irrigation water
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Pereira, Francisco H. F.

; Santos, Gisele L. dos

; Lacerda, Francisco H. D. de

; Sousa, Diogenes D. A. de

; Sousa, Valéria F. de O.

; Fernandes, Joyce E. de M.

; Silva, Silvana F. da

; Barboza, Jonathan B.

Revista Brasileira de Engenharia Agrícola e Ambiental

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jan 2023, Volume 27 N. 1 Pages 51 - 56

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

RESUMO No semiárido do Nordeste brasileiro as condições edafoclimáticas podem favorecer riscos de salinização do solo, principalmente quando se utiliza água de má qualidade para irrigação. Nesse contexto, técnicas que possibilitem melhorias nos rendimentos da cultura do melão em condições adversas, como a salinidade, são, portanto, de grande relevância para o setor produtivo. Logo, o objetivo deste estudo foi avaliar a eficácia do peróxido de hidrogênio (H2O2) na aclimatação do meloeiro submetido a diferentes níveis salinos na água de irrigação. Os tratamentos consistiram de duas condutividades elétricas da água de irrigação (0,3 e 5,0 dS m-1) e quatro concentrações de H2O2 (0, 5, 10 e 15 µmol L-1). O delineamento experimental utilizado foi o de blocos casualizados, em esquema fatorial 2 × 4, com quatro repetições e quatro plantas por parcela. O aumento da salinidade da água de irrigação reduz o crescimento, as trocas gasosas e a produção do meloeiro. No entanto, o H2O2, na concentração de 6,35 µmol L-1 proporcionou melhorias na fisiologia, crescimento e produção, além de reduzir os efeitos deletérios do estresse salino na produção de melão.

ABSTRACT In the semi-arid region of northeastern Brazil, soil and climate conditions can increase the risk of soil salinization, particularly when poor-quality water is used for irrigation. Therefore, techniques that improve the yields of melon culture under adverse conditions, such as salinity, are of great relevance to the production sector. The objective of this study was to evaluate the effectiveness of hydrogen peroxide (H2O2) in acclimatizing melon trees subjected to irrigation water with different salinity levels. The treatments consisted of irrigation water with two electrical conductivities (0.3 and 5.0 dS m-1) and four concentrations of H2O2 (0, 5, 10, and 15 µmol L-1). The experimental design used was randomized blocks, arranged in a 2 × 4 factorial scheme, with four replicates and four plants per plot. Increase in salinity of irrigation water reduced the growth, gas exchange, and production of melon plants. However, H2O2, at a concentration of 6.35 µmol L-1, yielded improvements in physiology, growth, and production, in addition to reducing the deleterious effects of saline stress on melon production.

https://doi.org/10.1590/1807-1929/agriambi.v27n1p51-56

10.

VOCs and PM listing of Eucalyptus globulus combustion in residential wood stoves
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Henríquez, Francisco

; Hernández, Diógenes

; Varas-Concha, Felipe

; Gutierrez, Camila

; Quinteros-Lama, Héctor

; Morales-Ferreiro, Jorge O.

Maderas. Ciencia y tecnología

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2023, Volume 25 elocation 12

Abstract: En | Text: En | PDF: En

Abstract: Pollutant residential emissions from wood stoves have significant impacts both on the environment and people's health. The above makes it essential to know the types of volatile organic compounds emitted during combustion and explore their relationship with particulate matter and greenhouse gas emissions. This paper studies and analyzes these emissions using Eucalyptus globulus as fuel varying its moisture levels. Emissions were determined using an adapted commercial stove. The concentration levels of volatile organic compounds and particulate matter increase with the moisture of wood. When analyzing volatile organic compounds, particulate matter, and O2 with the combustion stages of wood, it is found that their concentrations were higher in the ignition and the reload stage. The concentrations of CO2 and NOx were higher in the reload stage. Other chemical compounds, such as toluene, xylene, and benzene, were also found within the volatile organic compounds listing, which increased their concentration in the ignition and stable reload stages. However, in the quenching stage, they are not present. Finally, the dispersion of these molecules in the environment is evaluated, obtaining that if the atmospheric conditions are adverse, these molecules remain in the environment in direct contact with the people living in those places.

https://doi.org/10.4067/s0718-221x2023000100412

11.

Effect of 2-chloro-N-(4-fluoro-3-nitrophenyl)acetamide in combination with antibacterial drugs against Klebsiella pneumoniae
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CORDEIRO, LAÍSA V.

; SOUZA, HELIVALDO D.S.

; SOUSA, ALESON P.

; ANDRADE JÚNIOR, FRANCISCO P. DE

; FIGUEIREDO, PEDRO T.R. DE

; OLIVEIRA, RAFAEL F. DE

; ATHAYDE FILHO, PETRÔNIO F. DE

; OLIVEIRA-FILHO, ABRAHÃO A.

; LIMA, EDELTRUDES DE O.

Anais da Academia Brasileira de Ciências

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2023, Volume 95 N. 2 elocation e20210141

Abstract: En | Text: En | PDF: En

Abstract Klebsiella pneumoniae is a species of Gram-negative bacteria related to a wide range of infections and high rates of drug resistance. The combined use of antibacterial agents is one of the strategies that has been analyzed in recent years as part of the alternatives in the treatment of drug-resistant infections. Recently, the antibacterial activity of of 2-chloro-N-(4-fluoro-3-nitrophenyl)acetamide has been demonstrated against K. pneumoniae, also indicating that this acetamide did not show significant cytotoxic potential in preliminary tests. Thus, it becomes an interesting substance for future studies that explore its antimicrobial capacity, including investigating its association with antibacterial drugs. Based on this, this research aimed to analyze the effects of the association of 2-chloro-N-(4-fluoro-3-nitrophenyl)acetamide (CFA) with ciprofloxacin, cefepime, ceftazidime, meropenem and imipenem against K. pneumoniae strains. The results showed additivity when the substance was combined with ciprofloxacin and cefepime, indifference when associated with ceftazidime and synergistic effect when combined with meropenem and imipenem. Thus, the acetamide was able to optimize the effects of antibacterial drugs, reducing the concentrations necessary to cause bacterial death. These data indicate a potential future clinical use of these combinations, and further studies are needed to analyze this viability.

https://doi.org/10.1590/0001-3765202320210141

12.

Gas exchange in forage cactus cultivars of genera Opuntia and Nopalea (Cactaceae)
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Siva, Ronimeire Torres da

; Figueiredo, Francisco Romário Andrade

; Lopes, Maria de Fátima Queiroz

; Bruno, Riselane de Lucena Alcântara

; Andrade, Alberício Pereira de

Revista Ciência Agronômica

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2023, Volume 54 elocation e20218176

Abstract: En | Text: En | PDF: En

ABSTRACT Forage cactus species are cultivated in northeaster Brazil for feed, mainly during dry periods, as cacti are xerophytes well adapted to drought. Gas exchange studies have elucidated the physiological mechanisms underlying plant adaptation to ecosystems with low water availability. Here, we evaluated the variability between and within cactus forage genera Opuntia and Nopalea with respect to gas exchange behaviour. Twenty-one cultivars were used, 16 of which belonged to genus Opuntia, while six belonged to genus Nopalea, particularly, O. cochenillifera. Gas exchange was evaluated in the secondary cladode at 00:00 hours using a portable infrared gas analyser. Net CO2 assimilation rate, stomatal conductance, CO2 intercellular concentration, transpiration rate, and leaf temperature were evaluated. Additionally, instantaneous water use efficiency, intrinsic water use efficiency, and instantaneous carboxylation efficiency were calculated. Boxplots were used to assess value dispersion between the genera prior to submitting the data to multivariate analysis of principal components and cultivar-based grouping, and subsequently organizing the species studied in a dendrogram. Variability between the two genera and among cactus forage cultivars was detected for gas exchange. Cultivars were classified into three groups and two main components were identified. Cultivars 'Verdura' and 'Orelha de Elefante Mexicana’ showed higher photosynthetic performance.

https://doi.org/10.5935/1806-6690.20230035

13.

4-amino-2-phenyl-6-(p-fluorophenyl)-5-carbonitrile-pyrimidine-bis-substituted-loaded liposomes as promising system for cancer treatment
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OLIVEIRA, JANICE V.

; ALMEIDA, GLEYBSON C.

; NOGUEIRA, MARIANE C.B.L.

; AGUIAR JÚNIOR, FRANCISCO C.A.

; MELO, AUDENES O.

; SILVA, THIAGO D.S.

; SANTOS, NOEMIA P.S.

; MAGALHÃES, NEREIDE S.S.

; MELO, SEBASTIÃO J.

; FALCÃO, EMERSON P.S.

Anais da Academia Brasileira de Ciências

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2023, Volume 95 Suppl. 1 elocation e20211078

Abstract: En | Text: En | PDF: En

Abstract The aim of the present study was to perform in vitro and in vivo assessments of the antineoplastic action of 4-amino-pyrimidine encapsulated in liposomes. Liposomes were prepared and characterized for particle size and drug encapsulation and submitted to long-term stability tests. Cytotoxicity assays were performed in HeLa cells. Antineoplastic activity was investigated using the experimental sarcoma 180 tumor in Swiss albino mice. Encapsulation efficiency was 82.93 ± 0.04% and no significant changes were found with respect to particle size or pH after centrifugation and mechanical agitation tests. The in vitro results at concentration of 20 μg/mL indicated a considerable reduction in cell viability after treatment with encapsulated pyrimidine (75.91%). The in vivo assays using the compounds in encapsulated and free forms and 5-fluorouracil achieved tumor inhibition rates of 66.47 ± 26.8%, 50.46 ± 16.24% and 14.47 ± 9.22%, respectively. Mitotic counts demonstrated a greater reduction in the number of mitoses in animals treated with liposomal pyrimidine (32.15%) compared to those treated with the pyrimidine free (87.69%) and 5-fluorouracil (71.39%). This study demonstrated that the development of liposome formulations containing 4-amino-pyrimidine is a promising alternative for overcoming limitations related to the toxicity of current cancer treatment, ensuring greater therapeutic efficacy.

https://doi.org/10.1590/0001-3765202320211078

14.

Analysis of the Influence Of Friction Stir Welding on the Microstructure and Mechanical Properties of Alloy UNS-C27200 (CU-ZN)
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Rosa, Renato F.

; Almeida, Italo O.

; Varasquim, Francisco M. F. A.

; Junior, Eli J. C.

; Couto, Antônio A.

; Santos, Vinicius T.

; Silva, Márcio R.

; Nakamoto, Francisco Y.

; Santos, Givanildo A.

Materials Research

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2023, Volume 26 Suppl. 1 elocation e20220581

Abstract: En | Text: En | PDF: En

The copper alloy UNS-C27200 is a binary brass, composed of 38wt%Zn, beeing one of the most used in the industry. The union of Cu-Zn alloys by conventional welding by fusion in thin plates presents several challenges. The Friction Stir Welding (FSW) process performs the union of two, or more materials, through a rotating tool that travels throughout the welding region. One the great advantages of FSW is working below the melting point of the material, which reduces the change in the microstructure and properties of the material, when compared to conventional welding processes. Due to the lack of research on FSW process in lap brass joints with thin thicknesses, the present work aims to expand these studies in order to contribute to future research. Eight conditions were evaluated, varying rotation and welding speed. In the best results by visual inspection, analyzes of microstructure, temperature, microhardness and mechanical strength were performed. The better welding results were obtained with ω=1050 rpm and ν=20 mm/min. There was reduction of approximately 50% between Stir Zone and Base metal. The mechanical strength was affected by the pin hole resulting from the process. The microstructure revealed a homogeneous mixture in the stir zone and no defects were detected.

https://doi.org/10.1590/1980-5373-mr-2022-0581

15.

Effect of essential oil of Alpinia zerumbet on cardiovascular and autonomic function in rats with isoproterenol induced acute myocardial infarction
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HOLANDA, THAIS M.

; ROCHA, DANILO G.

; SILVEIRA, JOÃO ALISON M.

; COSTA, PAULA PRISCILA C.

; MAIA, PEDRO HENRIQUE F.

; INGRAM, CATHERINE

; MORAES, MARIA ELISABETE A. DE

; FECHINE, FRANCISCO V.

; MORAES FILHO, MANOEL O. DE

Anais da Academia Brasileira de Ciências

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2023, Volume 95 Suppl. 1 elocation e20201878

Abstract: En | Text: En | PDF: En

Abstract Alpinia zerumbet is a plant popularly used to treat hypertension and anxiety. Studies with Alpinia zerumbet demonstrate antihypertensive and vasodilator effects, among others. The objective of this study was to analyze the effect of essential oil of Alpinia zerumbet (EOAz) on cardiovascular and autonomic function in rats with isoproterenol-induced myocardial infarction. Male Wistar rats (n=32) were equally allocated into four groups: Control, ISO (150mg/kg, subcutaneous), EOAz (100mg/kg by gavage), ISO+EOAz. The rats were evaluated for cardiovascular and, autonomic parameters, electrocardiogram, and infarct size. EOAz was not able to reduce the electrocardiographic variations induced by ISO. Heart rate variability showed a decrease in sympathetic modulation on the heart in the groups treated with EOAz. The cardiopulmonary reflex induced by serotonin invoked a superior blood pressure variation at the 2 µg/kg dose in the EOAz treated groups, while the heart rate variation was significantly higher at the 16 µg/kg dose, when compared to other doses, in all groups, except EOAz+ISO. The sympathetic vagal index was higher in ISO group than in control. EOAz did not reduce the infarct size. We conclude that pretreatment with EOAz does not reverse the hemodynamic and electrocardiographic damage caused by isoproterenol but does reduce sympathetic modulation.

https://doi.org/10.1590/0001-3765202320201878

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