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Dividend distribution prediction for small- and medium-sized enterprises in an emerging economy
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Correa-Mejía, Diego Andrés

; Correa-García, Jaime Andrés

; Ríos, Carlos Eduardo Castaño

BBR. Brazilian Business Review

Journal Metrics
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- SciELO Analytics

2025, Volume 22 elocation e20231578

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

Resumo: A possibilidade de prever dividendos é um fator determinante para acionistas, investidores e gestores, uma vez que os dividendos são uma variável importante para a criação de valor da empresa. Este estudo tem como objetivo prever as decisões sobre dividendos de pequenas e médias empresas (PMEs) em uma economia emergente da América Latina. Apoiado numa amostra de 20.418 observações para os anos 2016-2018, um modelo de boosting é aplicado para estabelecer a incidência de um conjunto de indicadores financeiros para previsão de dividendos. As conclusões revelam que nenhum dos indicadores financeiros por si só pode explicar as expectativas futuras de dividendos, demonstrando a robustez do modelo de boosting aplicado, e confirma-se que as empresas que distribuíram dividendos no passado são consistentes com a sua política de dividendos. Este trabalho tem contribuições metodológicas, acadêmicas e práticas para o segmento de PME, para o contexto em que é estudado, e para outras economias emergentes. A evidência empírica fornecida abre portas para pesquisas futuras que irão aprimorar e aprofundar o estudo dessa decisão financeira.

Abstract: The possibility of predicting dividends is a determining factor for shareholders, investors, and management, since dividends are an important variable for firm value creation. This study aims to predict small and medium-sized enterprises’ (SMEs) dividend decisions in an emerging Latin American economy. Supported by a sample of 20,418 observations for the years 2016-2018, a boosting model is applied to establish the incidence of a set of financial indicators for dividend prediction. The findings reveal that none of the financial indicators alone can explain future dividend expectations, demonstrating the robustness of the boosting model applied, and confirming that companies that have distributed dividends in the past are consistent with their dividend policy. This work has methodological, academic, and practical contributions to the SME segment, to the context in which it is studied, and to other emerging economies. The empirical evidence provided opens the door to future research that will enhance and deepen the study of this financial decision.

https://doi.org/10.15728/bbr.2023.1578.en

Spatial distribution of population and forest cover in extractive reserves in the Amazon biome, Brazil
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D’Antona, Álvaro de Oliveira

; Côrtes, Julia Correa

; Alves, José Diego Gobbo

; Pelegrina, Guilherme

; Duarte, Leonardo Tomazeli

Revista Brasileira de Estudos de População

Journal Metrics
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2025, Volume 42 elocation e0294

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

Resumo Este estudo relaciona medidas espaciais de cobertura florestal com medidas de distribuição espacial da população nas 31 reservas extrativistas (REs) dentro do bioma amazônico, Brasil, em 2010. Integramos camadas de informações sobre as REs, cobertura florestal e distribuição espacial da população em um Sistema de Informação Geográfica. Produzimos 24 variáveis em três grupos: população; condições externas (ambas como variáveis preditoras); e cobertura da terra (variáveis previstas). Avaliamos se as variáveis preditoras estão correlacionadas com as variáveis de cobertura florestal e fragmentação florestal. Análises de regressão linear baseadas na teoria dos jogos cooperativos foram realizadas para entender a importância das variáveis preditoras na previsão do número de fragmentos florestais e do percentual de cobertura florestal nos modelos. Verificou-se que o tamanho, a concentração, a dispersão e a geometria da população contribuíram para a compreensão do desmatamento, bem como da estrutura da paisagem. No entanto, a fragmentação florestal e a extensão da cobertura florestal não são necessariamente definidas pelos mesmos aspectos populacionais. Os modelos sugerem que a mudança na cobertura florestal é principalmente impulsionada pela concentração da população na RE, enquanto a fragmentação florestal é altamente moldada pela dispersão populacional. O papel das condições externas (florestas circundantes e áreas protegidas) também foi relevante. Nosso estudo destaca a importância de incorporar medidas de distribuição espacial das florestas na pesquisa sobre população e meio ambiente, além do foco usual na extensão florestal. Também mostra a relevância de trabalhar com variáveis demográficas espaciais, indo além do enfoque convencional centrado no tamanho da população.

Resumen Este estudio relaciona las medidas espaciales de la cobertura forestal con las de la distribución espacial de la población en las 31 reservas extractivas (REs) dentro del bioma amazónico, Brasil, en 2010. Para ello, integramos capas de información sobre las REs, la cobertura forestal y la distribución espacial de la población en un sistema de información geográfica (SIG). Generamos 24 variables en tres grupos: población; condiciones externas (ambas como variables predictoras); y cobertura terrestre (variable predicha). Evaluamos si las variables predictoras están correlacionadas con las variables de cobertura y de fragmentación forestal. Se hicieron análisis de regresión lineal basados en la teoría de juegos cooperativos para comprender la importancia de las variables predictoras en la predicción del número de fragmentos forestales y del porcentaje de cobertura forestal en los modelos. Así. encontramos que el tamaño, la concentración, la dispersión y la geometría de la población contribuyeron a comprender la deforestación y la estructura del paisaje. Sin embargo, la fragmentación forestal y la extensión de la cobertura forestal no están necesariamente definidas por los mismos aspectos de la población. Los modelos sugieren que el cambio en la cobertura forestal está impulsado sobre todo por la concentración de la población en la RE, mientras que la fragmentación forestal está altamente influenciada por la dispersión de la población. El papel de las condiciones externas (bosques circundantes y áreas protegidas) también fue relevante. Nuestro estudio destaca la importancia de incorporar medidas de distribución espacial de los bosques en la investigación sobre población y medioambiente, más allá del enfoque habitual en la extensión forestal. También muestra la importancia de trabajar con variables demográficas espaciales, más allá del enfoque convencional centrado en el tamaño de la población.

Abstract This study relates spatial measures of forest cover with measures of the spatial distribution of the population in the 31 Extractive Reserves (ERs) within the Amazon biome, Brazil, in 2010. We integrated layers of information on the ERs, forest cover, and spatial distribution of the population in a Geographic Information System. We produced 24 variables in three groups: population; external conditions (both as predictor variables); and land cover (predicted variables). We assessed the correlation between predictor variables and forest cover and fragmentation variables. Linear regression analyses based on cooperative game theory were conducted to evaluate the significance of the predictor variables in explaining the number of forest fragments and the percentage of forest cover in the models. We found that the size, concentration, dispersion, and geometry of the population contributed to a better understanding of deforestation and the landscape structure. However, forest fragmentation and forest cover extent are not necessarily defined by the same population aspects. The models suggest that forest cover change is primarily driven by population concentration within the ER, while forest fragmentation is strongly shaped by population dispersion. External conditions such as surrounding forests and protected areas also played a significant role. Our study highlights the importance of incorporating forest spatial distribution measures into Population and Environment research, going beyond the usual focus on forest extent. Additionally, it highlights the value of working with spatial demographic variables, extending beyond the conventional approach centered on population size.

https://doi.org/10.20947/s0102-3098a0294

¿EXISTE LA PRUEBA ILÍCITA, LÍCITAMENTE OBTENIDA, EN EL PROCESO PENAL CHILENO?
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Robles*, Carlos Correa

; Pardo-Álvarez**, Diego

Revista chilena de derecho

Journal Metrics
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aug 2024, Volume 51 N. 2 Pages 159 - 187

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

ABSTRACT: In German criminal procedural law, it is possible to forbid the judge to assess a certain piece of evidence regardless of whether it has been legally obtained. This institution is called in German unselbstständiges Beweisverbot. The main justification for such exclusionary rule is constitutional: the assessment of a piece of evidence could lead to a violation of the fundamental rights of the individual. This paper analyzes the independent prohibition to use evidence in German scholarship and case law in order to ask whether its constituent elements are ascertainable in Chilean criminal procedural law and whether the solution proposed at the constitutional level in German law represents a plausible alternative in Chilean constitutional law.

RESUMEN: En el derecho procesal penal alemán es admisible prohibir la valoración por el juez de un elemento probatorio con independencia de haber sido éste obtenido lícitamente. Estas son las llamadas prohibiciones de valoración de prueba independiente. La principal justificación para tales prohibiciones es constitucional: la valoración misma de un medio de prueba podría constituir una infracción a los derechos fundamentales de las personas. Este trabajo analiza las prohibiciones de valoración independientes en la doctrina y jurisprudencia alemana, con el fin de preguntarse si sus elementos constitutivos son constatables en el derecho procesal penal chileno, y si la vía de solución propuesta a nivel constitucional desde el derecho alemán representa una alternativa plausible en el derecho constitucional chileno.

https://doi.org/10.7764/r.512.6

Percepción de habilidades en el uso de tecnologías de información y comunicación (TIC) para el aprendizaje en el contexto universitario: estudio de caso
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Sastoque, Jairo A.

; González-Rubio, Melissa

; Correa, Diego Alejandro

; Valencia-Arias, Alejandro

Formación universitaria

Journal Metrics
- Sobre o periódico
- SciELO Analytics

jun 2024, Volume 17 N. 3 Pages 73 - 82

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

Abstract: The main purpose of this study is to explore the perception and relevance of ICTs (Information and Communication Technologies) in student learning at the Corporación Universitaria Americana, Medellín campus (Colombia). The methodology has a mixed design that includes an adapted questionnaire after conducting a literature review. The questionnaire is applied to 2338 students selected through stratified sampling. The variables explored include the use of technological tools and training in virtual platforms. The results show that the quantity and diversity of used ICTs varies between academic and everyday contexts. The favourable perception of ICTs as learning facilitators is related to prior knowledge. Despite low training in virtual platforms, students maintain positive attitudes. It is highlighted the importance of adapting virtual pedagogical models to evolving education needs. It is concluded that it is necessary to integrate ICTs into teaching, to improve teacher training, and to personalize educational approaches.

Resumen: Este estudio tiene como objetivo explorar de manera inicial la percepción y relevancia de las TIC (Tecnologías de la Información y las Comunicaciones) en el aprendizaje de estudiantes en la Corporación Universitaria Americana, sede Medellín (Colombia). La metodología incluye un diseño mixto con un cuestionario adaptado tras revisión literaria, aplicado a 2.338 estudiantes mediante muestreo estratificado. Se exploran variables como uso de herramientas tecnológicas y capacitación en plataformas virtuales. Los resultados muestran que la cantidad y variedad de TIC utilizadas difieren en contextos académicos y cotidianos. La percepción positiva de las TIC como facilitadoras del aprendizaje se relaciona con conocimientos previos. Aunque la capacitación en plataformas virtuales es baja, los estudiantes mantienen percepciones favorables. Se resalta la importancia de adaptar modelos pedagógicos virtuales a las necesidades cambiantes de la educación actual. Se concluye que es necesario integrar TIC en la enseñanza, mejorar la formación docente y personalizar enfoques educativos.

https://doi.org/10.4067/s0718-50062024000300073

Position statement of the Brazilian Palliative Care Academy on withdrawing and withholding life-sustaining interventions in the context of palliative care
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Vidal, Edison Iglesias de Oliveira

; Ribeiro, Sabrina Correa da Costa

; Kovacs, Maria Júlia

; Máximo da Silva, Luciano

; Sacardo, Daniele Pompei

; Iglesias, Simone Brasil de Oliveira

; Silva, Josimário João da

; Neves, Cinara Carneiro

; Ribeiro, Diego Lima

; Lopes, Fernanda Gomes

Critical Care Science

Journal Metrics
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2024, Volume 36 elocation e20240021en

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

ABSTRACT The issue of withrawing and withholding life-sustaining interventions is an important source of controversy among healthcare professionals caring for patients with serious illnesses. Misguided decisions, both in terms of the introduction/maintenance and the withdrawal/withholding of these measures, represent a source of avoidable suffering for patients, their loved ones, and healthcare professionals. This document represents the position statement of the Bioethics Committee of the Brazilian Palliative Care Academy on this issue and establishes seven principles to guide, from a bioethical perspective, the approach to situations related to this topic in the context of palliative care in Brazil. The position statement establishes the equivalence between the withdrawal and withholding of life-sustaining interventions and the inadequacy related to initiating or maintaining such measures in contexts where they are in disagreement with the values and care goals defined together with patients and their families. Additionally, the position statement distinguishes strictly futile treatments from potentially inappropriate treatments and elucidates their critical implications for the appropriateness of the medical decision-making process in this context. Finally, we address the issue of conscientious objection and its limits, determine that the ethical commitment to the relief of suffering should not be influenced by the decision to employ or not employ life-sustaining interventions and warn against the use of language that causes patients/families to believe that only one of the available options related to the use or nonuse of these interventions will enable the relief of suffering.

RESUMO O tema da suspensão e da não implementação de intervenções de suporte de vida constitui importante fonte de controvérsia entre profissionais de saúde que lidam com pacientes com doenças graves. Decisões equivocadas, tanto em termos de introdução/manutenção, como de suspensão/não introdução dessas medidas representam fonte de sofrimento evitável para pacientes, seus entes queridos e profissionais de saúde. O presente documento representa o posicionamento do Comitê de Bioética da Academia Nacional de Cuidados Paliativos sobre essa questão e estabelece sete princípios para guiar, do ponto de vista da bioética, a abordagem de situações relacionadas a tal tema no contexto dos cuidados paliativos no Brasil. O posicionamento estabelece a equivalência entre a retirada e a não implementação de intervenções de suporte de vida e a inadequação relacionada a iniciar ou manter tais medidas em contextos em que elas estejam em desacordo com os valores e os objetivos de cuidado definidos em conjunto com pacientes e seus familiares. Adicionalmente, o posicionamento distingue tratamentos fúteis em senso estrito de tratamentos potencialmente inapropriados e elucida sua implicação crucial para a adequação do processo de tomada de decisão médica nesse contexto. Finalmente, o texto aborda a questão da objeção de consciência e seus limites; determina que o compromisso ético pelo alívio do sofrimento não deve ser influenciado pela decisão por empregar ou não intervenções de suporte de vida e adverte contra o uso de linguagem que induza pacientes/familiares a acreditarem que apenas uma das opções disponíveis relacionadas à utilização ou não dessas medidas possibilitará o alívio do sofrimento.

https://doi.org/10.62675/2965-2774.20240021-en

Factores determinantes del tipo de reporte corporativo usado por las compañías latinoamericanas
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Herrera Ortiz, Alejandra Correa-Mejía, Diego Andrés

Pensamiento & Gestión

Journal Metrics
- Sobre o periódico
- SciELO Analytics

dec 2023, N. 55 Pages 1 -

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

Resumen Los reportes corporativos son el mecanismo de rendición de cuentas por excelencia. Este estudio buscó analizar los factores que determinan el uso específico de un tipo de reporte corporativo divulgado por las empresas que cotizan en el Mercado Integrado Latinoamericano-MILA. Se utilizó un conjunto de datos de panel de 109 empresas durante el periodo 2016-2021 para establecer relaciones entre el tipo de reporte con variables independientes internas y externas. Los resultados ofrecen evidencia empírica a nivel latinoamericano de que una buena estructura de gobierno corporativo se asocia positivamente con el tipo de reporte corporativo, mientras que la calidad de la regulación del país tiene un efecto negativo y el control de la corrupción tiene el impacto contrario, los cuales se compensan con el gobierno corporativo. Ahora, las variables de desempeño financiero no tuvieron gran significancia en la elección del reporte.

Abstract Corporate reports are the accountability mechanism par excellence. This study aimed to analyze the factors that determine the specific use of a type of corporate report disclosed by companies listed on the Integrated Latin American Market-MILA. A panel data set of 109 companies was obtained during the period 2016-2021 to establish relationships between the type of report with internal and external independent variables. The results found empirical evidence at the Latin American level that a good corporate governance structure is positively associated with the type of corporate report, while the quality of the country's regulation has a negative effect and the control of corruption has the opposite impact. which are offset by corporate governance. Now, the financial performance variables did not have great importance in the choice of the report.

Determinants of dividend policy in small and medium-sized enterprises of an emerging market
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Correa-Mejía, Diego Andrés

; Correa-García, Jaime Andrés

; Castaño-Ríos, Carlos Eduardo

Cuadernos de Administración (Universidad del Valle)

Journal Metrics
- Sobre o periódico
- SciELO Analytics

dec 2023, Volume 39 N. 77 elocation e2012924

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

Resumen Este artículo tiene como objetivo analizar los factores determinantes de la política de dividendos en las PYMEs de una economía emergente como Colombia. Este tipo de organizaciones tiene gran importancia para las economías emergentes, pues son grandes generadoras de empleo y aportan al mejoramiento de la calidad de vida de muchas familias. Este estudio parte de los indicadores de liquidez, rentabilidad y endeudamiento, para demostrar sus vínculos con la política de dividendos en este tipo de entidades sobre las cuales no se cuenta con suficientes investigaciones empíricas en el contexto latinoamericano. Se estimaron datos de panel con un total de 11,888 observaciones para el período 2017-2019. Los resultados evidencian que la liquidez y la rentabilidad aumentan la política de dividendos de las PYMEs. Los indicadores de nivel de endeudamiento presentan una relación negativa. En general, los resultados proporcionan evidencia empírica sobre esta importante decisión financiera en un contexto y segmento empresarial escasamente estudiado. Además, los factores que influyen en la política de dividendos de estas empresas tienen implicaciones prácticas para los reguladores, inversores y analistas financieros, para fortalecer sus criterios de decisión en economías emergentes.

Abstract This paper aims to analyze the determining factors of dividend policy in SMEs of an emerging economy such as Colombia. SMEs are very important for emerging economies, as they are great job creators and contribute to improving the quality of life of many families. This study is based on liquidity, profitability and indebtedness variables, to demonstrate their links with the dividend policy in this type of entities on which there is not enough empirical research in the Latin American context. A panel data with a total of 11,888 observations was estimated for the horizon 2017-2019. The results evidence that liquidity and profitability increase SMEs’ dividend policy. Indebtedness level indicators present a negative relationship. Overall, the results provide empirical evidence on this important financial decision in a scarcely studied business context and segment. Additionally, the factors influencing dividend policy for these firms have practical implications for regulators, investors, and financial analysts to strengthen their decision criteria in emerging economies.

https://doi.org/10.25100/cdea.v39i77.12924

Plantas útiles en el área rural del municipio Linares, Nuevo León
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Estrada Castillón, Andrés Eduardo

; Paz Medrano, Alexsa Fabiola

; Scott Morales, Laura Magdalena

; Cotera Correa, Mauricio

; Valdes Alameda, Renata

; González Cuéllar, Diego Axayacatl

Revista mexicana de ciencias forestales

Journal Metrics
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- SciELO Analytics

oct 2023, Volume 14 N. 79 Pages 237 - 265

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

Resumen Se estudiaron la flora útil y los usos de las plantas del área rural de Linares, Nuevo León. Se realizaron 180 encuestas semiestructuradas en seis ejidos. Se registraron 75 familias, 194 géneros y 253 especies con uso etnobotánico. Las principales categorías de uso fueron: ornamental (105 especies), medicinal (83), alimento (6) y maderable (25), las 34 especies restantes son utilizadas como forraje, cosméticos y creencias. Cactaceae (19), Fabaceae (15), Asteraceae (15), Poaceae (15), Lamiaceae (12), Solanaceae (6), Asparagaceae (6) y Rutaceae (4) registraron el mayor número de taxa. Del total de especies identificadas, 120 son nativas y 133 exóticas. Respecto al uso medicinal, Allium sativum, Aloe vera, Echinocereus poselgeri, Equisetum laevigatum, Croton suaveolens, Mentha spicata, Litsea glaucescens y Ruta graveolens resultaron las más utilizadas. Las principales especies maderables fueron: Prosopis glandulosa, Vachellia farnesiana, Ebenopsis ebano, Havardia pallens, Quercus canbyi, Carya illinoinensis, Pinus cembroides, P. montezumae y P. teocote. Para el Factor de Consenso del Informante (FCI) las medicinales se utilizan, principalmente, para curar males de los sistemas respiratorio, circulatorio, reproductivo y digestivo. Los taxa con los valores más altos del Índice de Valor de Uso (IVU) fueron Dysphania ambrosioides, Allium cepa y A. sativum, todas con valor=1. Respecto al Índice de Fidelidad (IF, %), los mayores porcentajes correspondieron a Artemisia ludoviciana, Cymbopogon citratus y Hedeoma drummondii. La región rural de Linares posee una rica flora útil que se utiliza principalmente como ornamental, medicinal, alimenticia, forrajera y maderable.

Abstract The useful flora and uses of plants in the rural area of Linares, Nuevo León were analyzed. A total of 180 semi-structured surveys were conducted in six ejidos. 75 families, 194 genera and 253 species with ethnobotanical use were recorded. The main categories of use were: ornamental (105 species), medicinal (83), food (6) and timber (25); the remaining 34 species are used as fodder, cosmetics and beliefs. Cactaceae (19), Fabaceae (15), Asteraceae (15), Poaceae (15), Lamiaceae (12), Solanaceae (6), Asparagaceae (6), and Rutaceae (4) recorded the highest number of taxa. Of the total number of identified species, 120 are native, and 133 are exotic. As for the medicinal use, Allium sativum, Aloe vera, Echinocereus poselgeri, Equisetum laevigatum, Croton suaveolens, Mentha spicata, Litsea glaucescens and Ruta graveolens were the most widely used. The main timber species were Prosopis glandulosa, Vachellia farnesiana, Ebenopsis ebano, Havardia pallens, Quercus canbyi, Carya illinoinensis, Pinus cembroides, P. montezumae, and P. teocote. For the Informant Consensus Factor (ICF), medicinal plants are mainly used to cure ailments of the respiratory, circulatory, reproductive, and digestive systems. The taxa with the highest Use Value Index (UVI), equal to 1 in every case, were Dysphania ambrosioides, Allium cepa, and A. sativum. In regard to the Fidelity Index (FI, %), the highest percentages corresponded to Artemisia ludoviciana, Cymbopogon citratus, and Hedeoma drummondii. The Linares rural region has a rich useful flora, which is mainly used as ornamental, medicinal, food, forage and timber.

https://doi.org/10.29298/rmcf.v14i79.1353

New records of two-winged flies (Diptera: Brachycera) in social wasp colonies (Hymenoptera: Vespidae) from the Atlantic Forest biome in the state of Minas Gerais, Brazil
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Maciel, Tatiane Tagliatti

; Mota Soares, Matheus Mickael

; Aguilar Fachin, Diego

; Correa Barbosa, Bruno

Revista chilena de entomología

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sep 2023, Volume 49 N. 3 Pages 487 - 494

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

Abstract Nine new associations between dipterans and social wasp colonies are reported, providing information for understanding the ecological relationships between species in addition to new geographic distributions. The records took place between 2016 and 2018, in urban and secondary forest fragments in the cities of Cataguases, Goianá, Juiz de Fora, Muriaé, and Vinosa, all inserted in the Atlantic Forest biome in the state of Minas Gerais, Brazil. Understanding the ecological relationships between groups of insects provides subsidies for studies of ecology, biology, and behavior of the organisms involved in order to develop conservation strategies not only for the organisms but also for the areas where they occur.

Resumen Se reportan nueve nuevas asociaciones entre dípteros y colonias de avispas sociales, brindando información para comprender las relaciones ecológicas entre las especies, además de nuevas distribuciones geográficas. Los registros ocurrieron entre 2016 y 2018, en fragmentos de bosques urbanos y secundarios en las ciudades de Cataguases, Goianá, Juiz de Fora, Muriaé y Vinosa, todos ellos insertos en el bioma de Mata Atlántica en el estado de Minas Gerais, Brasil. Comprender las relaciones ecológicas entre grupos de insectos proporciona subsidios para estudios de ecología, biología y comportamiento de los organismos involucrados con el fin de desarrollar estrategias de conservación no solo para los organismos, sino que también para las áreas donde se encuentran.

https://doi.org/10.35249/rche.49.3.23.08

10.

Association between chronic lymphocityc thyroiditis and papillary thyroid carcinoma: Systematic review and meta-analysis of studies on surgical specimens
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Osorio-Covo, Carlos Ballestas-Barrera, Jorge Correa-Palacio, Juan Zambrano-Pacheco, Valeria Rosales-Becerra, Angie Camargo-Martínez, William Barrios-Castellar, Diego Ortega-Caballero, David Herrera-Sáenz, Francisco

Revista Colombiana de Cirugía

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mar 2023, Volume 38 N. 1 Pages 37 - 49

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

Resumen Introducción. Existen resultados inconsistentes con relación al planteamiento de la hipótesis que sugiere una mayor probabilidad de documentar un carcinoma papilar de tiroides en especímenes quirúrgicos con cambios compatibles con tiroiditis linfocítica crónica. En los metaanálisis se han incluido estudios no comparables metodológicamente y no se proponen claras fuentes de sesgo, justificación para la realización del presente estudio. Métodos. Se realizó una búsqueda bibliográfica en PubMed y Embase. Fueron obtenidos estudios retrospectivos donde se comparaba la prevalencia de carcinoma papilar de tiroides en especímenes con y sin cambios por tiroiditis linfocítica crónica. La evidencia recolectada fue sintetizada estadísticamente. Resultados. Un total de 22 artículos fueron incluidos. La población estuvo conformada por 63.548 especímenes. El OR combinado fue 1,81 (IC95%: 1,51-2,21). Hubo heterogeneidad en la distribución de las razones de oportunidad entre los estudios (I2= 91 %; p>0,00001). La forma del gráfico en embudo de los estudios incluidos en el análisis parece estar simétrica, lo que indica la ausencia del sesgo atribuible a los estudios pequeños. Conclusiones. La literatura actual sugiere que existe un mayor riesgo de documentar un carcinoma papilar de tiroides en especímenes quirúrgicos en los que se observan cambios compatibles con tiroiditis linfocítica crónica; sin embargo, existen fuentes de sesgo que no será posible controlar en estudios retrospectivos, por lo que recomendamos estudiar la hipótesis que sugiere una mayor probabilidad de diagnosticar un carcinoma papilar de tiroides en especímenes con cambios compatibles con tiroiditis linfocítica crónica mediante metodologías prospectivas.

Abstract Introduction. Inconsistent results exist in the literature regarding the hypothesis statement suggesting an increased likelihood of documenting papillary thyroid carcinoma (PTC) in surgical specimens with changes compatible with chronic lymphocytic thyroiditis. Existing meta-analyses have included studies that are not methodologically comparable and do not propose clear sources of bias, thus, this is justification for the present meta-analysis. Methods. A literature search in PubMed and Embase was performed from January 1, 1950 to December 31, 2020. Retrospective studies comparing the prevalence of papillary thyroid carcinoma in specimens with and without chronic lymphocytic thyroiditis changes were obtained. The collected evidence was statistically analyzed. Results. A total of 22 articles were included. The study population consisted of 63,548 surgical specimens. The pooled OR, based on the studies, was 1.81 (95% CI: 1.51-2.21). There was heterogeneity between the distribution of prevalence ratios and opportunity ratios across studies (I²= 91%; p>0.00001). The funnel plot shape of the studies included in the analysis appears to be symmetrical, indicating the absence of bias attributable to small studies. Conclusions. The current literature suggests that there is an increased risk of documenting papillary thyroid carcinoma in surgical specimens in which chronic lymphocytic thyroiditis-compatible changes are observed; however, there are sources of bias that will not be possible to control for in retrospective studies, so we recommend studying the hypothesis suggesting an increased likelihood of diagnosing PTC in specimens with chronic lymphocytic thyroiditis-compatible changes using prospective methodologies.

https://doi.org/10.30944/20117582.2228

11.

Qualidade da madeira e do carvão vegetal de quatro clones de Eucalyptus com idades entre 108 e 120 meses 10 12 1
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Ramos, Diego Correa

; Carneiro, Angélica de Cássia Oliveira

; Siqueira, Humberto Fauller de

; Oliveira, Aylson Costa

; Pereira, Bárbara Luísa Corradi

Ciência Florestal

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2023, Volume 33 N. 1 elocation e48302

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

RESUMO Cenários de instabilidade econômica e redução do consumo de carvão vegetal, como as ocorridas em 2009 e 2016, afetam a produção deste insumo, resultando na manutenção das florestas de eucalipto e aumento da idade de corte. O objetivo deste trabalho foi avaliar a qualidade da madeira de quatro clones de Eucalyptus (clones 1, 2, 3 e 4) com idades entre 108 e 120 meses e do carvão vegetal produzido em forno retangular. Para caracterização da madeira, foram avaliadas a relação cerne/alburno, densidade básica, massa seca por hectare.ano e composição química. As carbonizações foram realizadas em forno retangular, com capacidade de 210 m³ de madeira, e determinaram-se o rendimento gravimétrico e as propriedades do carvão vegetal: densidade do carvão vegetal, granulometria e porcentagem de finos, índice de friabilidade, análise imediata, além da massa de carvão produzida por hectare.ano. Verificou-se efeito significativo dos clones na densidade básica e massa seca, com valores de 494 a 589 kg m-3 e 12,47 a 23,34 ton.ha-1, respectivamente. O rendimento médio em carvão vegetal não diferiu entre os clones e foi igual a 34,1%, enquanto o rendimento em atiço variou de 3,2% para o clone 4 a 10,7% para o clone 3. Os clones 1 e 3 apresentaram em média 65% do volume de carvão vegetal na maior faixa granulométrica (>30 mm), enquanto os clones 2 e 4 tiveram 49,5% nessa granulometria. O carvão vegetal dos quatro clones foi de média resistência e a densidade aparente variou de 356 a 458 kg.m-3, com maior valor para o clone 3. Os clones 1 e 2 apresentaram a maior produção de carvão vegetal, 7,5 toneladas por hectare.ano. O carbono fixo não variou entre os clones, apresentando média igual a 76,92%. Os clones de Eucalyptus nas idades de 108 e 120 meses apresentam propriedades da madeira adequadas para a produção de carvão vegetal, alcançando rendimento gravimétrico e qualidade satisfatórios para uso metalúrgico, destacando-se os clones 1 (híbrido de E. urophylla x E. grandis) e 3 (híbrido de E. urophylla x E. camaldulensis). 200 2016 insumo corte 10 12 retangular cernealburno cerne alburno cerne/alburno hectareano hectare ano química 21 m determinaramse determinaram se finos friabilidade imediata Verificouse Verificou 49 58 m3 m- 1247 47 12,4 2334 23 34 23,3 ton.ha1, tonha1 tonha ton.ha ton ha ton.ha-1 respectivamente 341 34,1% 32 3,2 107 7 10,7 65 >30 30 (>3 mm, mm , mm) 495 5 49,5 35 45 kg.m3, kgm3 kgm kg.m 3, kg.m-3 75 7, 7692 76 92 76,92% metalúrgico destacandose destacando híbrido E grandis camaldulensis. camaldulensis . camaldulensis) 20 201 124 12, 233 23, ha1 ton.ha1 ton.ha- 34,1 10, 6 >3 (> 49, kg.m3 kg.m- 769 9 76,92 34, > ( 76,9 76,

ABSTRACT Economic instability scenarios and reduction in charcoal consumption, such as those that occurred in 2009 and 2016, affect production and result in the maintenance of eucalyptus forests and an increase in the rotation age. The objective of this work was to evaluate the quality of wood from four Eucalyptus clones (clones 1, 2, 3, and 4) at the ages of 108 and 120 months and the charcoal produced in a rectangular kiln. We evaluated the heart/sapwood ratio, basic density, dry mass per hectare.year, and chemical composition . The carbonizations were performed in a rectangular kiln (210 m³ of wood). We determined the gravimetric yield and the charcoal properties: density, particle size and percentage of fines, friability index, proximate analysis, and mass of charcoal produced per hectare.year. We verified the significant effect of clones on basic density and dry mass, whose variations were from 494 to 589 kg m-3 and 12.47 to 23.34 ton.ha-1, respectively. The charcoal yield did not differ among clones (34.1%), while the yield of semicarbonized wood varied from 3.2% (clone 4) to 10.7% (clone 3). The particle size of 65% of the charcoal volume of clones 1 and 3 was greater than 30 mm, and 49.5% of clones 2 and 4. We found medium mechanical resistance for charcoal from all four clones. The apparent density ranged from 356 to 458 kg.m-3, with the highest average value for clone 3. We found the highest charcoal production for clones 1 and 2, 7.5 tons per hectare.year. The fixed carbon did not vary among clones (76.92%). The wood properties of the Eucalyptus clones at ages 108 and 120 months are suitable for charcoal production for metallurgical use. Clones 1 (a hybrid of E. urophylla x E. grandis) and 3 (a hybrid of E. urophylla x E. camaldulensis) stood out from the others. consumption 200 2016 age 4 10 12 heartsapwood heart sapwood ratio hectareyear hectare year hectare.year 210 (21 m wood. wood) fines index analysis 49 58 m3 m- 1247 47 12.4 2334 23 34 23.3 ton.ha1, tonha1 tonha ton.ha ton ha ton.ha-1 respectively 34.1%, 341 34.1% , (34.1%) 32 3.2 107 7 10.7 3) 65 mm 495 5 49.5 35 45 kg.m3, kgm3 kgm kg.m kg.m-3 75 7. 76.92%. 7692 76.92% 76 92 (76.92%) use E grandis camaldulensis others 20 201 21 (2 124 12. 233 23. ha1 ton.ha1 ton.ha- 34.1 (34.1% 10. 6 49. kg.m3 kg.m- 769 76.92 9 (76.92% ( 34. (34.1 76.9 (76.92 (34. 76. (76.9 (34 (76. (3 (76 (7

https://doi.org/10.5902/1980509848302

12.

The SISBIOTA-Diptera Brazilian Network: A long-term survey of Diptera from unexplored Brazilian Western Arc of Amazon, Cerrado, and Pantanal
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Lamas, Carlos José Einicker

; Fachin, Diego Aguilar

; Falaschi, Rafaela Lopes

; Alcantara, Daniel Máximo Correa de

; Ale-Rocha, Rosaly

; Amorim, Dalton de Souza

; Araújo, Maíra Xavier

; Ascendino, Sharlene

; Baldassio, Letícia

; Bellodi, Carolina Ferraz

; Bravo, Freddy

; Calhau, Julia

; Capellari, Renato Soares

; Carmo-Neto, Antonio Marcelino do

; Cegolin, Bianca Melo

; Couri, Márcia Souto

; Carvalho, Claudio José Barros de

; Dios, Rodrigo de Vilhena Perez

; Falcon, Aida Vanessa Gomez

; Fusari, Livia Maria

; Garcia, Carolina de Almeida

; Gil-Azevedo, Leonardo Henrique

; Gomes, Marina Morim

; Graciolli, Gustavo

; Gudin, Filipe Macedo

; Henriques, Augusto Loureiro

; Krolow, Tiago Kütter

; Mendes, Luanna Layla

; Limeira-de-Oliveira, Francisco

; Maia, Valéria Cid

; Marinoni, Luciane

; Mello, Ramon Luciano

; Mello-Patiu, Cátia Antunes de

; Morales, Mírian Nunes

; Oliveira, Sarah Siqueira

; Patiu, Claudemir

; Proença, Barbara

; Pujol-Luz, Cristiane Vieira de Assis Pujol-Luz, José Roberto Rafael, José Albertino Riccardi, Paula Raile Rodrigues, João Paulo Vinicios Roque, Fabio de Oliveira Sallum, Maria Anice Mureb Santis, Marcelo Domingos de Santos, Charles Morphy Dias dos Santos, Josenilson Rodrigues dos Savaris, Marcoandre Shimabukuro, Paloma Helena Fernandes Silva, Vera Cristina Schelesky-Prado, Daniel de Castro Silva-Neto, Alberto Moreira da Camargo, Alexssandro Sousa, Viviane Rodrigues de Urso-Guimarães, Maria Virginia Wiedenbrug, Sofia Yamaguchi, Carolina Nihei, Silvio Shigueo

Revista Brasileira de Entomologia

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2023, Volume 67 N. 4 elocation e20230051

Abstract: En | Text: En | PDF: En

ABSTRACT The SISBIOTA-BRASIL was a three-year multimillion-dollar research program of the Brazilian government to document plants and animals in endangered/understudied areas and biomes in Brazil. Distributional patterns and the historical events that generated them are extensively unknown regarding Brazilian fauna and flora. This deficiency hinders the development of conservation policies and the understanding of evolutionary processes. Conservation decisions depend on precise knowledge of the taxonomy and geographic distribution of species. Given such a premise, we proposed to research the diversity of Diptera of the Brazilian western arc of Amazon, Cerrado, and Pantanal in the states of Mato Grosso, Mato Grosso do Sul, and Rondônia. Three important biomes of the South American continent characterize these Brazilian states: Amazon forest, Cerrado (Brazilian Savannah), and Pantanal. Besides their ecological relevance, these biomes historically lack intensive entomological surveys. Therefore, they are much underrepresented in the Brazilian natural history collections and in the scientific literature, which is further aggravated by the fact that these areas are being exponentially and rapidly converted to commercial lands. Our project involved over 90 collaborators from 24 different Brazilian institutions and one from Colombia among researchers, postdocs, graduate and undergraduate students, and technicians. We processed and analyzed nearly 300,000 specimens from ~60 families of Diptera collected with a large variety of methods in the sampled areas. Here, we provide a detailed overview of the genera and species diversity of 41 families treated. Our results point to a total of 2,130 species and 514 genera compiled and identified for the three states altogether, with an increase of 41% and 29% in the numbers of species and genera known for the three states combined, respectively. Overall, the 10 most species-rich families were Tachinidae, Cecidomyiidae, Tabanidae, Psychodidae, Sarcophagidae, Stratiomyidae, Bombyliidae, Syrphidae, Tephritidae, and Asilidae. The 10 most diverse in the number of genera were Tachinidae, Stratiomyidae, Asilidae, Mycetophilidae, Syrphidae, Tabanidae, Muscidae, Dolichopodidae, Sarcophagidae, and Chloropidae. So far, 111 scientific papers were published regarding taxonomic, phylogenetic, and biogeographical aspects of the studied families, with the description of 101 new species and three new genera. We expect that additional publications will result from this investigation because several specimens are now curated and being researched by specialists.

https://doi.org/10.1590/1806-9665-rbent-2023-0051

13.

Shear in reinforced concrete beams with continuous internal transverse reinforcement
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Souza, Diego Ferreira de

; Abrantes, Jedson Henryque Correa

; Tapajós, Luamim Sales

; Ferreira, Mauricio de Pina

; Lima Neto, Aarão Ferreira

Revista IBRACON de Estruturas e Materiais

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2023, Volume 16 N. 1 elocation e16106

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

Resumo: Elementos de concreto armado com elevada taxa de armadura longitudinal e transversal podem apresentar conflitos das duas armaduras gerando redução em produtividade durante a armação do elemento e mal posicionamento da armadura transversal diminuindo a efetividade da armadura. Diante disso, essa pesquisa apresenta um tipo de armadura transversal interna como forma de mitigar esse conflito entre as barras transversais e longitudinais. Foram ensaiadas 5 vigas faixa de concreto armado, sendo uma de referência com estribos fechados e as outras 4 com estribos internos variando a inclinação das armaduras transversais internas em 60º e 90º e a quantidade de pernas verticais da armadura transversal interna utilizada. Comparando os resultados das vigas com estribos interno com a viga de referência, observou-se que os estribos internos garantiram ganhos de até 14% de capacidade de resistência ao cisalhamento em comparação com o estribo fechado.

Abstract: Reinforced concrete elements with a high longitudinal and transverse reinforcement ratio may present conflicts on both of them, resulting in reduced labor productivity and a poor job when assembling the transversal reinforcement, reducing its effectiveness. Thus, this research presents a type of internal transverse reinforcement as an alternative to mitigate this conflict between the transverse and longitudinal bars. A total of 5 reinforced concrete wide beams were made, one of them as a reference with closed stirrups, and the other ones with internal stirrups, varying the inclination of the internal transverse reinforcement in 60° and 90°, and the number of vertical legs of the internal transverse reinforcement used. Comparing the results of the beams with internal stirrups with the reference beam, it was observed that the internal stirrups provided increases of up to 14% in shear strength when compared with the closed stirrup.

https://doi.org/10.1590/s1983-41952023000100006

14.

Correction: Disseminated intravascular coagulation phenotype is regulated by the TRPM7 channel during sepsis
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Jiménez-Dinamarca, Ivanka

; Prado, Yolanda Tapia, Pablo Gatica, Sebastian Alt, Clemens Lin, Charles P. Reyes-Martínez, Cristian Feijóo, Carmen G. Aravena, Cristobal González-Canacer, Alejandra Correa, Simón Varela, Diego Cabello-Verrugio, Claudio Simon, Felipe

Biological Research

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2023, Volume 56 elocation 24

Abstract: En | Text: En | PDF: En

https://doi.org/10.1186/s40659-023-00433-6

15.

Disseminated intravascular coagulation phenotype is regulated by the TRPM7 channel during sepsis
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Jiménez-Dinamarca, Ivanka

Biological Research

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2023, Volume 56 elocation 8

Abstract: En | Text: En | PDF: En

Abstract Background Sepsis is an uncontrolled inflammatory response against a systemic infection that results in elevated mortality, mainly induced by bacterial products known as endotoxins, producing endotoxemia. Disseminated intravascular coagulation (DIC) is frequently observed in septic patients and is associated with organ failure and death. Sepsis activates endothelial cells (ECs), promoting a prothrombotic phenotype contributing to DIC. Ion channel mediated calcium permeability participates in coagulation. The transient reception potential melastatin 7 (TRPM7) non-selective divalent cation channel that also contains an α-kinase domain, which is permeable to divalent cations including Ca2+, regulates endotoxin-stimulated calcium permeability in ECs and is associated with increased mortality in septic patients. However, whether endothelial TRPM7 mediates endotoxemia-induced coagulation is not known. Therefore, our aim was to examine if TRPM7 mediates coagulation during endotoxemia. Results The results showed that TRPM7 regulated endotoxin-induced platelet and neutrophil adhesion to ECs, dependent on the TRPM7 ion channel activity and by the α-kinase function. Endotoxic animals showed that TRPM7 mediated neutrophil rolling on blood vessels and intravascular coagulation. TRPM7 mediated the increased expression of the adhesion proteins, von Willebrand factor (vWF), intercellular adhesion molecule 1 (ICAM-1), and P-selectin, which were also mediated by the TRPM7 α-kinase function. Notably, endotoxin-induced expression of vWF, ICAM-1 and P-selectin were required for endotoxin-induced platelet and neutrophil adhesion to ECs. Endotoxemic rats showed increased endothelial TRPM7 expression associated with a procoagulant phenotype, liver and kidney dysfunction, increased death events and an increased relative risk of death. Interestingly, circulating ECs (CECs) from septic shock patients (SSPs) showed increased TRPM7 expression associated with increased DIC scores and decreased survival times. Additionally, SSPs with a high expression of TRPM7 in CECs showed increased mortality and relative risk of death. Notably, CECs from SSPs showed significant results from the AUROC analyses for predicting mortality in SSPs that were better than the Acute Physiology and Chronic Health Evaluation II (APACHE II) and the Sequential Organ Failure Assessment (SOFA) scores. Conclusions Our study demonstrates that sepsis-induced DIC is mediated by TRPM7 in ECs. TRPM7 ion channel activity and α-kinase function are required by DIC-mediated sepsis-induced organ dysfunction and its expression are associated with increased mortality during sepsis. TRPM7 appears as a new prognostic biomarker to predict mortality associated to DIC in SSPs, and as a novel target for drug development against DIC during infectious inflammatory diseases.

https://doi.org/10.1186/s40659-023-00419-4

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