Abstract The technique of bending wood by vaporization presents itself as a viable option for curvilinear structural projects, such as gridshells. Coniferous woods are often used in roof structures because, in addition to the desired relationship between mechanical strength and density, they allow the complete treatment of the cross-section of the piece. However, characteristics such as the predominance of sapwood or heartwood and the presence of defects are variables that affect structural performance. The aim of this study was to evaluate the bending limit of Acrocarpus laxinifloius (Indian cedar) veneers with a bending radius of 21 cm at different thicknesses. The impact of the predominance of sapwood or heartwood and the presence of defects on the bending strength was also investigated. The literature indicates that plastic flexibilization by steam occurs at 100°C, with 2.4 minutes for each millimeter of lamella thickness, which were the parameters considered in this study. The statistical analysis indicated a thickness limit of 8 mm for the lamellae to bend and the greater presence of sapwood or heartwood, as well as wood defects, did not significantly affect the bending force. projects gridshells because density crosssection cross section piece However performance Indian cedar 2 thicknesses investigated 100C C 100 100°C 24 4 2. force 10 1

Resumo Atécnica de vergamento da madeira por vaporização se apresenta como opção viável para projetos de estruturas curvilíneas, como as gridshells. Madeiras coníferas são comumente adotadas em estruturas de cobertura, pois além da desejada relação entre resistência mecânica e densidade, permitem o completo tratamento da seção transversal da peça. Entretanto, características como a predominância de alburno ou de cerne e a presença de defeitos são variáveis que afetam o desempenho estrutural. O objetivo deste estudo foi avaliar o limite de vergamento de lamelas de Acrocarpus flaxinifloius (cedro indiano) com raio de curvatura de 21 cm em diferentes espessuras. Também se investigou o impacto da predominância de alburno ou cerne e da presença de defeitos na força de vergamento. A literatura indica que a flexibilização plástica por vapor ocorre a 100°C, com 2,4 minutos para cada milímetro de espessura da lamela, parâmetros estes considerados neste estudo. A análise estatística indicou o limite de 8 mm de espessura para o vergamento das lamelas e a maior presença de alburno ou de cerne, bem como os defeitos da madeira, não afetou significativamente a força de vergamento. curvilíneas gridshells cobertura densidade peça Entretanto estrutural cedro indiano 2 espessuras 100C C 100 100°C 24 4 2, lamela 10 1

Abstract This study aimed to evaluate the effect of thermal treatment on the adhesion quality of bonded joints in high-density wood, specifically Corymbia citriodora and Eucalyptus pellita, using resorcinol formaldehyde and castor oil-based polyurethane adhesives. It was used at temperatures of 160 ºC, 180 ºC and 200 °C, being compared with a control batch. The percentage of failure in the wood was analyzed to evaluate the quality of the bonding. The castor oil-based polyurethane adhesive exhibited higher values of viscosity and solid content than resorcinol formaldehyde. Eucalyptus pellita showed higher shear strength values compared to Corymbia citriodora wood. The increase in temperature reduced the shear strength for both woods. The ratio between the strength of the bonded wood and solid wood, at the same treatment temperature, often exceeded one, indicating the formation of an adhesive-fiber composite, which enhances the strength of the bonded interface, especially for C. citriodora wood. Overall, there was better bonding of Eucalyptus pellita wood with resorcinol formaldehyde, and it exhibited less thermal degradation due to lower mass loss. highdensity high density oilbased oil based adhesives 16 18 20 C °C batch woods one adhesivefiber fiber composite interface Overall loss 1 2

Resumo Esse estudo teve como objetivo avaliar o efeito do tratamento térmico na qualidade da adesão de juntas coladas de madeira de alta densidade, Corymbia citriodora e Eucalyptus pellita utilizando os adesivos resorcinol e poliuretano vegetal à base de óleo de mamona. O tratamento térmico foi realizado nas temperaturas de 160 ºC, 180 ºC e 200 °C, sendo comparadas com um lote controle. A qualidade da colagem foi avaliada através do teste de cisalhamento e análise do percentual de falha na madeira. O adesivo de poliuretano de mamona apresentou maiores valores de viscosidade e teor de sólidos, do que o resorcinol formaldeído. O Eucalyptus pellitaexibiu maiores valores de resistência ao cisalhamento que a madeira de Corymbia citriodora. O aumento da temperatura reduziu a resistência ao cisalhamento para ambas as madeiras. A razão entre a resistência da madeira colada com madeira solida, na mesma temperatura de tratamento, muitas vezes atingiu valores superiores a um, indicando a formação de um compósito adesivo-fibras, que aumenta a resistência da interface colada, especialmente para madeira de C. citriodora. De forma geral, houve uma melhor colagem da madeira de Eucalyptus pellita, com resorcinol formaldeído, e está exibiu menor degradação térmica, devido à menor perda de massa. densidade 16 18 20 C °C controle sólidos formaldeído madeiras solida adesivofibras, adesivofibras fibras, fibras adesivo-fibras geral térmica massa 1 2

Abstract The NBR 7190-3 (ABNT, 2022) presents various methods to determine the wood's modulus of elasticity, allowing for the adoption of equivalence between the modulus of elasticity in compression (Ec0) and tension (Et0). However, it does not provide a way to estimate the modulus of elasticity in bending (EM0), and such estimates do not consider the variation in anatomical structures among species. Faced with this gap, it is necessary to evaluate whether these equations are valid for different species. This article evaluated the elastic properties of three species: Cumaru (Dipteryx odorata), Marupá (Simarouba amara Aubl., Simaroubaceae) and Roxinho (Peltogyne spp., Leguminosae). For this purpose, a non-destructive flexural test was initially conducted, followed by compression and tension tests. Microscopic images were compared to understand the influence of anatomical structures on stiffness properties. The results confirmed the equivalence between Ec0 and Et0. The higher concentration of parenchyma cells in Cumaru and Roxinho is responsible for statistically lower values of EM0 compared to Ec0 and Et0. 71903 7190 3 7190- ABNT, ABNT (ABNT 2022 woods wood s Ec (Ec0 Et0 Et . (Et0) However EM0, EM , (EM0) species gap Dipteryx odorata, odorata odorata) Simarouba Aubl Aubl. Simaroubaceae Peltogyne spp spp. Leguminosae. Leguminosae Leguminosae) purpose nondestructive non destructive conducted tests 719 202 (Ec (Et0 (EM0 71 20 (Et (EM 7 2

Resumo A NBR 7190-3 (ABNT, 2022) apresenta diferentes métodos para determinar o módulo de elasticidade da madeira, permitindo a adoção de equivalência entre o módulo de elasticidade na compressão (Ec0) e na tração (Et0). Por outro lado, não apresenta uma forma de estimar o módulo de elasticidade na flexão (EM0), e tais estimativas não consideram a variação das estruturas anatômicas das espécies. Diante dessa lacuna, é necessário avaliar se essas equações são válidas para diferentes espécies. O presente artigo avaliou as propriedades elásticas de três espécies: Cumaru (Dipteryxodorata), Marupá (Simarouba amara Aubl., Simaroubaceae) e Roxinho (Peltogyne spp., Leguminosa). Para isso, realizou-se o ensaio não destrutivo de flexão, seguido de ensaios à compressão e à tração. Imagens microscópicas foram comparadas, para compreender a influência das estruturas anatômicas nas propriedades de rigidez. Os resultados confirmaram a equivalência entre Ec0 e Et0. A maior concentração de parênquimas no Cumaru e no Roxinho é responsável pelos valores estatisticamente inferiores de EM0 em relação ao Ec0 e Et0. 71903 7190 3 7190- ABNT, ABNT (ABNT 2022 madeira Ec (Ec0 Et0 Et . (Et0) lado EM0, EM , (EM0) espécies lacuna Dipteryxodorata, Dipteryxodorata (Dipteryxodorata) Simarouba Aubl Aubl. Simaroubaceae Peltogyne spp spp. Leguminosa. Leguminosa Leguminosa) isso realizouse realizou comparadas rigidez 719 202 (Ec (Et0 (EM0 (Dipteryxodorata 71 20 (Et (EM 7 2

Abstract (Introduction) The mountainous region of the Central Pacific of Costa Rica, currently made up mostly of the cantons of Turrubares, Puriscal and Mora, and to a lesser extent by the southwest of Acosta, was one of the most deforested areas since colonial times. (Objective) To comprehensively analyze the historical, socioeconomic, geo-climatic and ecological factors that possibly favored the logging exploitation of the forests of that region. (Methodology) The historical documents, and the geo-climatic, ecological and socioeconomic factors of the region were reviewed. In addition, a census was carried out among forestry professionals and industrialists to determine the timber species possibly extracted from the forests based on the floristic composition of protected forest areas in the region. (Results) The mountainous region was a transit and settlement site for Spanish colonists since the 16th century, which facilitated the development of access roads. Its proximity to the Central Valley, which needed forest and agricultural products for the growing urban area, together with the existence of an ecological convergence zone extraordinarily rich in trees of commercial importance, greatly facilitated the extraction of forest products. (Conclusion) The early colonization of the region, the existence of infrastructure, high demand for forest products at the national and international level, and the availability of forest resources in an area where the tropical dry forest, the cloud forest and the humid forest converge, and the edaphoclimatic conditions that also facilitated the development of agricultural crops, favored the change in land use and therefore the forestry exploitation of the region.

Resumen: (Introducción) La región montañosa del Pacífico Central de Costa Rica, actualmente conformada, en su mayoría, por los cantones de Turrubares, Puriscal y Mora, y, en menor extensión, por el suroeste de Acosta, fue una de las zonas más deforestada desde tiempos coloniales. (Objetivo) Analizar integralmente los factores históricos, socioeconómicos, geoclimáticos y ecológicos que posiblemente favorecieron la explotación maderera de los bosques de esa región. (Metodología) Se revisaron los documentos históricos, y los factores geoclimáticos, ecológicos y socioeconómicos de la región. Además, se realizó un censo entre profesionales e industriales de la madera para determinar las especies maderables eventualmente extraídas de los bosques, basado en composición florística de zonas de bosque protegidas de la región. (Resultados) La región montañosa fue sitio de paso y asentamiento de los colonos españoles desde el siglo XVI, lo que facilitó el desarrollo de caminos de acceso. Su cercanía al Valle Central, que necesitó productos forestales y agrícolas para la creciente zona urbana, unido a la existencia de una zona de convergencia ecológica extraordinariamente rica en árboles de importancia comercial, facilitó, en mucho, la extracción de productos forestales. (Conclusión) La colonización temprana de la región, la existencia de infraestructura, alta demanda de productos forestales en el ámbito nacional e internacional, y la disponibilidad de recursos forestales en una zona donde convergen el bosque seco tropical, el bosque nuboso y el bosque húmedo tropical, y las condiciones edafoclimáticas que facilitaron también el desarrollo de cultivos agrícolas, favorecieron posiblemente el cambio de uso del suelo y, por ende, la explotación forestal de la región.

Abstract (Introduction) The mountainous region of the Central Pacific of Costa Rica, currently made up mostly of the cantons of Turrubares, Puriscal and Mora, and to a lesser extent by the southwest of Acosta, was one of the most deforested areas since colonial times. (Objective) To comprehensively analyze the historical, socioeconomic, geo-climatic and ecological factors that possibly favored the logging exploitation of the forests of that region. (Methodology) The historical documents, and the geo-climatic, ecological and socioeconomic factors of the region were reviewed. In addition, a census was carried out among forestry professionals and industrialists to determine the timber species possibly extracted from the forests based on the floristic composition of protected forest areas in the region. (Results) The mountainous region was a transit and settlement site for Spanish colonists since the 16th century, which facilitated the development of access roads. Its proximity to the Central Valley, which needed forest and agricultural products for the growing urban area, together with the existence of an ecological convergence zone extraordinarily rich in trees of commercial importance, greatly facilitated the extraction of forest products. (Conclusion) The early colonization of the region, the existence of infrastructure, high demand for forest products at the national and international level, and the availability of forest resources in an area where the tropical dry forest, the cloud forest and the humid forest converge, and the edaphoclimatic conditions that also facilitated the development of agricultural crops, favored the change in land use and therefore the forestry exploitation of the region.

Resumen: (Introducción) La región montañosa del Pacífico Central de Costa Rica, actualmente conformada, en su mayoría, por los cantones de Turrubares, Puriscal y Mora, y, en menor extensión, por el suroeste de Acosta, fue una de las zonas más deforestada desde tiempos coloniales. (Objetivo) Analizar integralmente los factores históricos, socioeconómicos, geoclimáticos y ecológicos que posiblemente favorecieron la explotación maderera de los bosques de esa región. (Metodología) Se revisaron los documentos históricos, y los factores geoclimáticos, ecológicos y socioeconómicos de la región. Además, se realizó un censo entre profesionales e industriales de la madera para determinar las especies maderables eventualmente extraídas de los bosques, basado en composición florística de zonas de bosque protegidas de la región. (Resultados) La región montañosa fue sitio de paso y asentamiento de los colonos españoles desde el siglo XVI, lo que facilitó el desarrollo de caminos de acceso. Su cercanía al Valle Central, que necesitó productos forestales y agrícolas para la creciente zona urbana, unido a la existencia de una zona de convergencia ecológica extraordinariamente rica en árboles de importancia comercial, facilitó, en mucho, la extracción de productos forestales. (Conclusión) La colonización temprana de la región, la existencia de infraestructura, alta demanda de productos forestales en el ámbito nacional e internacional, y la disponibilidad de recursos forestales en una zona donde convergen el bosque seco tropical, el bosque nuboso y el bosque húmedo tropical, y las condiciones edafoclimáticas que facilitaron también el desarrollo de cultivos agrícolas, favorecieron posiblemente el cambio de uso del suelo y, por ende, la explotación forestal de la región.

Abstract: The percentage of juvenile wood in fast-growing conifers is a determinant of the basic properties, since its proportion increases as the rotation age decreases. This wood is characterized by having less length and thickness of tracheids and greater microfibrillar angle, which translates into lower density and lower elasto-resistant properties. To delimit the transition age of wood (juvenile-mature), we carried out a radial analysis of some of the mentioned characteristics. The importance of establishing transition age lies in the estimation of the volumes of both woods, their quality and potential use. The objective of the work was to determine the transition age and compare its elasto-resistant values in Pinus contorta (lodgepole). Based on nine samples of 35 years-old, we have been working with north and south radius for anatomical studies, while we used juvenile and mature wood for physical-mechanical tests. The transition ages were between 12 and 16,5 years, north and south direction, respectively. The anatomical, physical and mechanical variables differed significantly, being higher in the mature wood. Repeating our analysis framework in other study sites could generate an informative database of this species for the region.

Resumen: El porcentaje de madera juvenil en coníferas de crecimiento rápido es un factor determinante de las propiedades básicas, ya que su proporción aumenta a medida que disminuye la edad de rotación. Dicha madera se caracteriza por presentar menor longitud y espesor de pared de traqueidas y mayor ángulo micro-fibrilar, lo cual se traduce en menor densidad y propiedades elasto-resistentes más bajas. Para delimitar la edad transición de madera (juvenil-madura) se realiza el análisis radial de algunas de las características mencionadas. La importancia de establecer dicha edad, radica en la estimación de los volúmenes de ambos tipos de madera, su calidad y potencialidad de uso. El objetivo del trabajo fue determinar la edad de transición y comparar sus valores elasto-resistentes en Pinus contorta (lodgepole). Se trabajó con 9 muestras de 35 años, radios norte y sur para estudios anatómicos, y madera juvenil y madura para ensayos físico mecánicos. Las edades de transición resultaron entre los 12 y 16,5 años, dirección norte y sur, respectivamente. Las variables anatómicas, físicas y mecánicas se diferenciaron significativamente, siendo mayores en la madera madura. A fin de generar una base de datos de esta especie para la región, se sugiere continuar con estudios similares en otros sitios.

Lapachol, a naphthoquinone discovered in 1858, is a natural product with a broad spectrum of therapeutic activities, along with its derivatives and analogues. Initially found in several species of the Bignoniaceae family, lapachol can also be found in other families. Lapachol arouses great interest and knowledge due to its crucial role in medicinal chemistry, playing an important role in the rational planning of research in search of bioactive substances with pharmacological action, whether as a source of raw material or helping directly or indirectly. This work aims to describe a new methodology for extracting lapachol, which differs from the conventional acid-base method, providing a highly efficient, simple and easy-to-apply process. 1858 activities analogues family families chemistry action indirectly acidbase acid base method efficient easytoapply easy apply process 185 18 1

ABSTRACT Objective: This study was aimed at analyzing and disseminating the fossil wood collection data stored in the thin sections of the paleobotany collection of the Department of Paleontology and Stratigraphy of the Institute of Geosciences at the Federal University of Rio Grande do Sul. Thin sections of petrified wood are described. Research data used in geosciences specifically seek to develop a model for the use of this type of sheet in paleobotany, enabling visualization of its representativeness in studies published over 40 years to obtain the anatomical characteristics of fossil woods and define their systematic affinities as a specific typology of research data in geosciences. Methods: The methodology involved interviewing a paleobotanical specialist and using different techniques applied in metric studies to map scientific production in petrified wood. Thus, a dataset of (20) thin slide sections of petrified fossil wood used in “Stressing environmental conditions in the ‘petrified forest’ from the Mata Sequence in the Triassic context of the Paraná Basin,” a paper published by the Journal of South American Earth Sciences (DOI:10.1016/j.jsames.2023.104415), was used. Depending on the methodology, these thin sections petrified wood can reveal systematic paleoclimatic signatures based on the anatomical characteristics of the fossil wood. In addition to this case study, which represents a collection of more than (2.000) thousand blades of fossil wood and approximately 40 years of research, the paleobotanical collection of the department is reused in methodology classes. The collection comprises a database created by research physicists that provides information on anatomical features, systematic affinities, paleoclimatic conditions, and paleoenvironmental insights. Potential for reuse: The reuse, registration, storage, identification, and preservation of thin sections as a type of research data used in paleobotany aims to improve the methodology associated with the organization of the physical database of the institution. The research data and blades of fossil wood are being digitized. They will soon be available under CC BY 4.0, according to the sample described in this data paper (DOI Mendeley: 10.17632/b8phfcsync.3). Furthermore, the data can be reused in optical and electronic scanning microscopy software. Objective Sul 4 Methods Thus 20 (20 Stressing forest Basin, Basin DOI10.1016/j.jsames.2023.104415, DOI101016jjsames2023104415 DOIjjsames DOI 10.1016/j.jsames.2023.104415 , 10 1016 j jsames 2023 104415 (DOI:10.1016/j.jsames.2023.104415) 2.000 2000 2 000 (2.000 classes features insights reuse registration storage identification institution digitized 0 4.0 Mendeley 10.17632/b8phfcsync.3. 1017632b8phfcsync3 bphfcsync 10.17632/b8phfcsync.3 . 17632 b8phfcsync 3 b phfcsync 10.17632/b8phfcsync.3) Furthermore software (2 DOI10 DOI10.1016/j.jsames.2023.104415 jjsames DOI101016jjsames202310441 101016jjsames2023104415 10.1016/j.jsames.2023.10441 1 101 202 10441 (DOI:10.1016/j.jsames.2023.104415 2.00 200 00 (2.00 4. 1017632b8phfcsync 10.17632/b8phfcsync. 1763 ( DOI1 DOI10.1016/j.jsames.2023.10441 DOI101016jjsames20231044 101016jjsames202310441 10.1016/j.jsames.2023.1044 1044 (DOI:10.1016/j.jsames.2023.10441 2.0 (2.0 10.17632/b8phfcsync 176 DOI10.1016/j.jsames.2023.1044 DOI101016jjsames2023104 101016jjsames20231044 10.1016/j.jsames.2023.104 104 (DOI:10.1016/j.jsames.2023.1044 2. (2. 17 DOI10.1016/j.jsames.2023.104 DOI101016jjsames202310 101016jjsames2023104 10.1016/j.jsames.2023.10 (DOI:10.1016/j.jsames.2023.104 DOI10.1016/j.jsames.2023.10 DOI101016jjsames20231 101016jjsames202310 10.1016/j.jsames.2023.1 (DOI:10.1016/j.jsames.2023.10 DOI10.1016/j.jsames.2023.1 DOI101016jjsames2023 101016jjsames20231 10.1016/j.jsames.2023. (DOI:10.1016/j.jsames.2023.1 DOI10.1016/j.jsames.2023. DOI101016jjsames202 101016jjsames2023 10.1016/j.jsames.2023 (DOI:10.1016/j.jsames.2023. DOI10.1016/j.jsames.2023 DOI101016jjsames20 101016jjsames202 10.1016/j.jsames.202 (DOI:10.1016/j.jsames.2023 DOI10.1016/j.jsames.202 DOI101016jjsames2 101016jjsames20 10.1016/j.jsames.20 (DOI:10.1016/j.jsames.202 DOI10.1016/j.jsames.20 DOI101016jjsames 101016jjsames2 10.1016/j.jsames.2 (DOI:10.1016/j.jsames.20 DOI10.1016/j.jsames.2 101016jjsames 10.1016/j.jsames. (DOI:10.1016/j.jsames.2 DOI10.1016/j.jsames. 10.1016/j.jsames (DOI:10.1016/j.jsames. DOI10.1016/j.jsames (DOI:10.1016/j.jsames

RESUMO Objetivo: O estudo visa divulgar e analisar a coleção de lenhos fósseis armazenadas no acervo de lâminas delgadas da coleção de paleobotânica do Departamento de Paleontologia e Estratigrafia do Instituto de Geociências da Universidade Federal do Rio Grande do Sul. Descrevem-se lâminas delgadas de madeira petrificada, enquanto dados de pesquisa utilizados para investigação em Geociências, em específico, busca-se compor um modelo para utilização deste tipo de lâmina na paleobotânica o que permite visualizar sua representatividade em estudos publicados durante 40 anos. Assim, obter-se-á as características anatômicas de laminas de lenhos fósseis com vistas a definir suas afinidades sistemáticas como uma tipologia específica de dados de pesquisa em Geociências. Métodos: A metodologia envolve entrevista com um especialista em paleobotânica e a utilização de diferentes técnicas aplicadas em estudos métricos para mapear a sua produção científica em lenhos fósseis. Nesse sentido, como exemplo descrevem-se um conjunto de dados de (20) lâminas delgadas de lenhos fósseis petrificados utilizados no paper Stressing environmental conditions in the “petrified forest” from the Mata Sequence in the Triassic context of the Paraná Basin publicados pelo periódico Journal of South American Earth Sciences, conforme DOI: 10.1016/j.jsames.2023.104415. A metodologia de utilização dessas lâminas no paper permite a identificação de assinaturas paleoclimáticas, com base em características anatômicas de lenhos fósseis. Além desse estudo de caso, esse data paper serve para representar uma coleção de mais de (2.000) mil lâminas de lenhos fósseis, cerca de 40 anos de pesquisa em paleobotânica que é reutilizada em aulas de metodologia e compõem uma base de dados de pesquisa que fornece informações sobre características anatômicas, afinidades sistemáticas, condições paleoclimáticas e percepções paleoambientais. Potencial de reutilização: A reutilização desse conjunto de dados permite o registro, o armazenamento, a identificação e a preservação de lâminas delgadas de lenhos fósseis enquanto um tipo de dado de pesquisa em Geociências, também objetiva aprimorar a organização de um banco de dados. Esses dados da pesquisa estão sendo digitalizados e em breve todos estarão disponíveis sob a licença CC BY 4.0, conforme a amostra descrita nesse data paper. (Mendeley DOI: 10.17632/b8phfcsync.3) os quais poderão ser reutilizados por softwares de microscopia óptica e de varredura eletrônica. Objetivo Sul Descrevemse Descrevem se petrificada específico buscase busca 4 Assim obterseá obter á Métodos sentido descrevemse descrevem 20 (20 petrified forest Sciences DOI 101016jjsames2023104415 jjsames 10 1016 j jsames 2023 104415 10.1016/j.jsames.2023.104415 caso 2.000 2000 2 000 (2.000 paleoambientais registro armazenamento 0 4.0 Mendeley 10.17632/b8phfcsync.3 1017632b8phfcsync3 bphfcsync 17632 b8phfcsync 3 b phfcsync eletrônica (2 101016jjsames202310441 1 101 202 10441 10.1016/j.jsames.2023.10441 2.00 200 00 (2.00 4. 10.17632/b8phfcsync. 1017632b8phfcsync 1763 ( 101016jjsames20231044 1044 10.1016/j.jsames.2023.1044 2.0 (2.0 10.17632/b8phfcsync 176 101016jjsames2023104 104 10.1016/j.jsames.2023.104 2. (2. 17 101016jjsames202310 10.1016/j.jsames.2023.10 101016jjsames20231 10.1016/j.jsames.2023.1 101016jjsames2023 10.1016/j.jsames.2023. 101016jjsames202 10.1016/j.jsames.2023 101016jjsames20 10.1016/j.jsames.202 101016jjsames2 10.1016/j.jsames.20 101016jjsames 10.1016/j.jsames.2 10.1016/j.jsames. 10.1016/j.jsames

ABSTRACT Knowledge of the physical and mechanical properties of wood is crucial for the safety and efficiency of structural design. In addition to promoting diversification and supply in the timber market, determining these properties for different types of native woods can contribute to reduce the concentrated overexploitation of tropical woods. Among the woods available for construction purposes in the Tocantina region of Maranhão State is tuturubá (Pouteria oblanceolata Pires). In this context, the present study aimed to evaluate the physical and mechanical properties of tuturubá wood for its use in building structures. The characterizations carried out were: moisture content, apparent density, compressive strength parallel and perpendicular to the grain, shear strength parallel to the grain, flexural strength, modulus of elasticity in compression parallel to the grain and three-point bending test. For the average moisture content, a percentage value of 13.88% was checked, and for the average apparent density, a value of 992.04 kg.m-3 was obtained. For the compressive strength parallel to the grain, an average value of 60.03 MPa was determined, while the characteristic value was 56.86 MPa. The compressive modulus of elasticity parallel to the grain determined was equal to 22761 MPa. The average values for compressive strength perpendicular to the grain and shear strength parallel to the grain were 10.74 MPa and 10.47 MPa, respectively. For flexural strength, average and characteristic values were 154.82 and 128.37 MPa, respectively. For the flexural modulus of elasticity, an average value of 21026 MPa was determined. The results allowed tuturubá wood to be classified in mechanical resistance class D50. Compared to other commercially available wood species, tuturubá has better mechanical properties than pequiá (Cary-ocar villosum) and tauari (Couratari oblongifolia) woods. This physical-mechanical characterization high-lights the potential of tuturubá wood for use in building structures. design market Pouteria Pires. Pires . Pires) context structures content density threepoint three point test 1388 13 88 13.88 checked 99204 992 04 992.0 kg.m3 kgm3 kgm kg.m 3 kg m kg.m- obtained 6003 60 03 60.0 5686 56 86 56.8 2276 1074 10 74 10.7 1047 47 10.4 respectively 15482 154 82 154.8 12837 128 37 128.3 2102 D50 D species Caryocar Cary ocar villosum Couratari oblongifolia physicalmechanical highlights high lights 138 1 8 13.8 9920 99 0 992. m3 600 6 60. 568 5 56. 227 107 7 10. 104 4 1548 15 154. 1283 12 128. 210 D5 13. 9 22 21 2

RESUMO O conhecimento das propriedades físicas e mecânicas da madeira é crucial para a segurança e eficácia do dimensionamento das estruturas. Além de favorecer a diversificação e abastecimento do mercado madeireiro, a determinação de tais propriedades, para diferentes espécies nativas, pode contribuir para a redução da exploração concentrada de madeiras tropicais. Entre as madeiras disponíveis para a construção civil na Região Tocantina do Maranhão encontra-se o tuturubá (Pouteria oblanceolata Pires). Neste contexto, este estudo teve como objetivo determinar as propriedades físicas e mecânicas da madeira de tuturubá, visando o seu uso em estruturas de edificações. Foram determinados: o teor de umidade, a densidade aparente, as resistências à compressão paralela e perpendicular às fibras, a resistência ao cisalhamento paralelo às fibras, a resistência à flexão e os módulos de elasticidade à compressão paralela às fibras e à flexão. Obteve-se um teor de umidade médio de 13,88%, uma densidade aparente média de 992,04 kg.m-3, o valor médio da resistência à compressão paralela às fibras igual a 60,03 MPa e o valor característico de 56,86 MPa, sendo o módulo de elasticidade à compressão paralela às fibras de 22761 MPa. A resistência média à compressão perpendicular às fibras foi de 10,74 MPa e a resistência média ao cisalhamento paralelo às fibras foi igual a 10,47 MPa. A resistência à flexão média foi de 154,82 MPa e o valor característico igual a 128,37 MPa, enquanto o valor médio do módulo de elasticidade à flexão foi de 21026 MPa. Os resultados permitiram classificar a madeira de tuturubá como pertencente à classe de resistência mecânica D50. Comparativamente com outras espécies disponíveis no mercado madeireiro, a madeira de tuturubá apresentou propriedades mecânicas superiores às madeiras de pequiá (Caryocar villosum) e tauari (Couratari oblongifolia). Esta caracterização físico-mecânica evidencia o potencial da madeira de tuturubá para utilização em estruturas de edificações. madeireiro nativas tropicais encontrase encontra se Pouteria Pires. Pires . Pires) contexto edificações determinados Obtevese Obteve 1388 13 88 13,88% 99204 992 04 992,0 kg.m3, kgm3 kgm kg.m 3, kg m 3 kg.m-3 6003 60 03 60,0 5686 56 86 56,8 2276 1074 10 74 10,7 1047 47 10,4 15482 154 82 154,8 12837 128 37 128,3 2102 D50 D Caryocar villosum Couratari oblongifolia. oblongifolia oblongifolia) físicomecânica físico 138 1 8 13,88 9920 99 0 992, m3 kg.m3 kg.m- 600 6 60, 568 5 56, 227 107 7 10, 104 4 1548 15 154, 1283 12 128, 210 D5 13,8 9 22 21 13, 2

Abstract: Thermal modification of wood is an environmentally friendly method to improve wood durability, mainly against microorganisms. By employing a process similar to the ThermoWood®, various Gmelina arborea (gamhar) wood specimens were thermally modified at 180 °C, 200 °C, and 220 °C for 3 hours. The effects of the thermal modification process on the resistance to decay by rot-fungi, and attack by subterranean, arboreal, and dry-wood termites were determined. Generally, the thermal modification improved the resistance of Gmelina arborea (gamhar) to decay by Trametes versicolor with increasing process temperature. However, the effect of the process was null on the resistance to biodeterioration by the brown-rot fungus Coniophora puteana and the dry-wood termites Cryptotermes brevis. Even so, the visual damage caused by Cryptotermes brevis was slight. Untreated and thermally modified woods recorded higher resistance to Coniophora puteana than Trametes versicolor. Mass loss caused by Nasutitermes corniger also decreased with increasing thermal modification temperature. According to the visual damage rating values, the attack by Nasutitermes corniger was slight. However, the thermal modification inversely impacted Gmelina arborea (gamhar) attack by Macrotermes sp., as its resistance in the field to the termites decreased with increasing modification temperature. Thus, the thermal modification process contributed to improving the decay resistance of the modified wood to white-rot fungus Trametes versicolor and attack by the arboreal termites Nasutitermes corniger exposed indoors. On the other hand, thermally modified Gmelina arborea (gamhar) wood was very susceptible to Macrotermes sp. in the field. This work would provide a reliable reference document to guide wood industry stakeholders in assessing the performance of untreated and thermally modified Gmelina arborea (gamhar) wood in situations exposed to fungi and termite species adopted.

Abstract This study investigated the electrical resistivity of 105 timber species from the Peruvian tropical forest; with a focus on promoting sustainable use by considering the wood’s equilibrium moisture content (EMC). Employing a non-destructive method, it correlated the wood’s physical properties with its electrical resistivity, uncovering an inverse exponential relationship between resistivity and EMC, with resistivity values ranging from 0.0244 x 109 Ωm to 26.0104 x 109 Ωm across different cutting directions (longitudinal, tangential, and radial). These findings allowed for the classification of the woods into five groups based on their moisture balance and electrical resistivity, from very high to very low. This classification aids in identifying the appropriate and sustainable use of these timber species in various applications, highlighting the study’s contribution to sustainable forest management. 10 wood s EMC. EMC . (EMC) nondestructive non destructive method 00244 0 0244 0.024 260104 26 0104 26.010 longitudinal, longitudinal (longitudinal tangential radial. radial radial) low applications studys management 1 (EMC 0024 024 0.02 26010 2 010 26.01 002 02 0.0 2601 01 26.0 00 0. 260 26.

ABSTRACT Background: Acacia mearnsii and Eucalyptus dunnii are species planted mainly for tannin and cellulose production. However, its woods have characteristics favorable to their use for energy generation, being commercialized in the form of firewood, chips or charcoal too. Biochar is a stable form of carbon that can be obtained by converting small particles of wood in the pyrolysis process and that can be used as solid fuel, among other applications as a soil conditioner. In this study, the properties of biochar produced in a horizontal reactor using wood of these species and under milder temperatures were evaluated. Results: Temperature of 350 oC and the reaction time of 30 minutes promoted an increase in higher calorific value of 33% for A. mearnsii and 51% for E. dunnii, with gravimetric yield of 39% and 32%, respectively. it was found that the 250 and 300 oC was not efficient to carbonize the wood of both species. An increase in specific surface area is observed with increasing carbonization temperature. Bigger increases were produced at temperatures of 350 oC for E. dunnii and 420 oC for A. mearnsii, with increase in porosity. At these temperatures, there was an increase in surface area and a decrease in pore size. Conclusion: In temperatures of 350 oC, the woods of both species provided a good quality biochar with porosity, surface area, pore size and pyrolysis yield suitable for energy use. For soil conditioning use, considering these aspects, suggested to test the appropriate temperatures for each species, between 350 and 420 oC. Background production However generation firewood too fuel conditioner study evaluated Results 35 3 33 A 51 E 39 32 32% respectively 25 temperature 42 porosity Conclusion aspects 5 2 4

Resumo Introdução: A fotomarcação é uma técnica não invasiva que envolve a aplicação de um fotossensibilizador e a subsequente visualização com lâmpada de Wood para determinar as margens do câncer de pele não melanoma. Isso poderia ser útil em conjunto com a cirurgia micrográfica de Mohs ao definir de forma mais precisa as margens histológicas tumorais. Objetivo: Comparar os limites tumorais entre a demarcação clínica, a demarcação dermatoscópica e a demarcação com ALA em carcinomas cutâneos, e corroborá-los com o defeito cirúrgico obtido pela CMM. Método: Estudo observacional, descritivo e prospectivo. Foram comparadas as áreas tumorais de câncer de pele não melanoma observadas por clínica, dermatoscopia, fotomarcação e defeito cirúrgico final. Resultados: A média da área clínica foi de 1,77 cm2 (DP 0,55), a média da área dermatoscópica foi de 1,93 cm2 (DP 0,55), a média da área por fotomarcação foi de 2,14 cm2 (DP 0,55) e a média da área do defeito cirúrgico final foi de 4,41 cm2 (DP 1,12). Conclusões: Não foi possível comprovar que a fotomarcação tenha uma vantagem estatisticamente significativa em relação à marcação clínica e dermatoscópica. Mais estudos são necessários para determinar o papel dessa técnica.

Resumen Introducción: La fotomarcación es una técnica no invasiva que consiste en la aplicación de un fotosensibilizador y la posterior visualización con lampara de Wood para determinar los márgenes de cáncer de piel no melanoma. Esto podría ser de utilidad en conjunto con la cirugía micrográfica de Mohs, al definir de manera más precisa los márgenes histológicos tumorales. Objetivo: Comparar los límites tumorales entre la demarcación clínica, la dermatoscópica y la demarcación con ALA en carcinomas cutáneos, y corroborarlos con el defecto quirúrgico obtenido por la CMM. Método: Estudio observacional, descriptivo y prospectivo. Se compararon las áreas tumorales de cáncer de piel no melanoma observadas por clínica, dermatoscopía, fotomarcación y defecto quirúrgico final. Resultados: El promedio del área clínica fue 1,77 cm2 (DE 0,55), el promedio de área dermatoscópica fue 1,93 cm2 (DE 0,55), el promedio del área por fotomarcación fue 2,14 cm2 (DE 0,55) y el promedio del área del defecto quirúrgico final fue 4,41 cm2 (DE 1,12). Conclusiones: No se logró comprobar que la fotomarcación tenga una ventaja estadísticamente significativa respecto a la marcación clínica y dermatoscópica. Se requieren más estudios para determinar el rol de esta técnica.

Abstract Introduction: Photomarking is a non-invasive technique that involves the application of a photosensitizer and subsequent visualization with a Wood’s lamp to determine the margins of non-melanoma skin cancer. This could be useful in conjunction with Mohs micrographic surgery by more precisely defining the histological tumor margins. Objective: To compare the tumor limits between clinical demarcation, dermatoscopic demarcation, and ALA demarcation in cutaneous carcinomas, and corroborate them with the surgical defect obtained by MMS. Method: Observational, descriptive, and prospective study. The tumor areas of non-melanoma skin cancer observed by clinic, dermatoscopy, photomarking, and final surgical defect were compared. Results: The average clinical area was 1,77 cm2 (SD 0.55), the average dermatoscopic area was 1,93 cm2 (SD 0,55), the average area by photomarking was 2,14 cm2 (SD 0,55), and the average area of the final surgical defect was 4,41 cm2 (SD 1,12). Conclusions: It was not possible to demonstrate that photomapping provides a statistically significant advantage over clinical and dermatoscopic marking. Further studies are needed to determine the role of this technique.

ABSTRACT A fortuitous observation of mate-guarding behavior of male Chrysoprasis a. auriventris is presented here. In our observation, a male hold onto the female's body using his forelegs and walks along with her while she lays the eggs into the trunk slits. While guarding the female, the male adopted aggressive postures and attacked rival males that approached her. We suggest that the mate-guarding behavior may explain the male's elongated mid and hindlegs in this species, under a functional perspective. Additionally, a new host plant association was recorded. mateguarding mate here females female s slits species perspective Additionally recorded

Abstract: Hunting is part of the biocultural heritage of the Maya people of the Yucatán Peninsula because it has been part of their strategy of multiple use of resources and their cosmovision since pre-Hispanic times. The study of knowledge and practices on the uses of natural resources can help to improve the resilience of biological and human communities to disturbances. The aim of this study was to characterize the biocultural knowledge associated with traditional hunting in the Mayan community of Xul, Yucatán. From September to December 2020, 42 mixed questionnaires and seven semi-structured interviews were applied to local hunters. It was found that 23 species of vertebrates (35 mammals, 6 birds, and 1 reptile) are hunted in Xul and are used mainly for food. The species with higher cultural importance (IIC) were the red brocket deer (Mazama temama), collared peccary (Pecari tajacu), and ocellated turkey (Meleagris ocellata). The dry season is their favorite season for hunting (71.4 %) and hunters prefer the milpa (92.9 %) and forest (83.3 %) as hunting sites. The most practiced techniques are the “batida” (flushing by hunting teams, p’uuj; 92.9 %), “caminar por el monte” (walking through the woods, xíimbal ts’on; 73.8 %), and “lampareo” (hunting with flashlights, ts’on; 69 %). In Xul there are beliefs such as virtues, the owners of animals and the winds (Ik’). These results show the continuity of biocultural knowledge related to hunting and its importance in the management and conservation of wild fauna in rural communities.

Resumen: La cacería es una actividad que forma parte del patrimonio biocultural de los mayas de la Península de Yucatán, ya que desde la época prehispánica ha sido parte de su estrategia de uso múltiple de recursos y su cosmovisión. El estudio de los conocimientos y prácticas sobre el empleo de los recursos naturales puede contribuir a aumentar la resiliencia de las comunidades biológicas y humanas ante las perturbaciones. El objetivo de este estudio fue caracterizar el conocimiento biocultural asociado a la cacería tradicional en la comunidad maya de Xul, Yucatán. Se aplicaron 42 cuestionarios mixtos y siete entrevistas semiestructuradas a cazadores locales entre septiembre y diciembre de 2020. Se reportaron 23 especies de vertebrados que se cazan en Xul (16 mamíferos, 6 aves y 1 reptil) y sus usos. Las especies de mayor importancia cultural (IIC) son el venado cabrito (Mazama temama), el jabalí (Pecari tajacu) y el pavo de monte (Meleagris ocellata). La temporada de sequía es la preferida para cazar (71.4 %) y los sitios son la milpa (92.9 %) y el monte alto (83.3 %). Las técnicas que más se practican son la batida (p’uuj; 92.9 %), caminar por el monte (xíimbal ts’on; 73.8 %) y el lampareo (ts’on; 69 %). En Xul existen creencias en elementos y entidades como las virtudes, los Dueños de los animales y los vientos (Ik’). Estos resultados manifiestan la continuidad e importancia de considerar el conocimiento biocultural sobre la cacería con relación al manejo y conservación de la fauna silvestre en comunidades rurales.