Observação Microscópica De Inclusões Minerais No Xilema De Espécies Tropicais Da Amazônia

Vasconcellos, Francisco José de; Freitas, Jorge Alves de; Silva, Ademir Castro e

doi:10.1590/1809-43921995252068

Cited by 8 publications

(6 citation statements)

References 4 publications

(4 reference statements)

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“…Prismatic calcium oxalate crystals were observed in axial parenchyma cells of Caryocar villosum, in radial parenchyma cells of Protium altissimum, and both in Astronium lecointei. The presence of crystals is frequent in angiosperm wood and can be used as a taxonomic criterion in plant species, as well as in the analysis of difficulties encountered in wood processing (Vasconcelos et al 1995;Costa et al 2006). These mineral inclusions were previously cited in the literature by Nisgoski et al (2012) and Braga J unior et al (2020) for Caryocar villosum, by Albuquerque (2012) for Astronium lecointei, and by Ishiguri et al (2003) for Protium altissimum.…”

Section: Anatomical Featuresmentioning

confidence: 99%

Wood Properties of Four Tropical Species from Mining Areas in the Amazon, Brazil Part 1: Anatomical Characterization

Abreu,

Silva,

Ferreira

et al. 2024

WFS

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Mining is an essential economic activity in Brazil, but it causes several negative impacts, including deforestation. Vegetation suppression is a common activity in mining areas, and it generates large volumes of discharged logs from excavation activity. In most cases, these logs are stacked and stored in open-air yards, as a result, the material is exposed to conditions that favor the degradation process. To minimize these impacts, the goal of this research was to anatomically characterize and determine some of the physical properties of wood species that are species wasted in open mining areas and to evaluate their potential uses. Due to the lack of anatomical information of the species studied, the objective of Part 1 of

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Section: Anatomical Featuresmentioning

confidence: 99%

Wood Properties of Four Tropical Species from Mining Areas in the Amazon, Brazil Part 1: Anatomical Characterization

Abreu,

Silva,

Ferreira

et al. 2024

WFS

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“…The chemical composition was confirmed by SEM, which identified in the crystal the presence of silica (Si), oxygen (O 2 ), and carbon (C). According to Vasconcellos et al [33], the presence of silica in tropical woods is common and, for Burseraceae family, silica is exclusively found in fibers.…”

Section: Image Analysismentioning

confidence: 99%

Properties of a Laminated Wood Composite Produced with Thermomechanically Treated Veneers

Arruda¹,

Menezzi²

2016

Advances in Materials Science and Engineering

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The paper aimed at evaluating the properties of plywood made from thermomechanically treated wood veneers. Veneers from Amescla (Trattinnickia burseraefolia) wood were treated in a hydraulic press with electric resistance heating. Two temperature levels were applied, 140°C and 180°C, for 1 and 2 minutes with 2.7 N/mm2of pressure. A total of 30 plywood boards were produced, including six boards produced from untreated veneers. The results showed that the thermomechanical treatment did not have any deleterious effect on glue line strength and most of the mechanical properties of plywood made from treated veneers were improved. On the other hand, plywood made from untreated veneers presented better dimensional stability. Dimensional stability properties were most affected by the temperature of the treatment, while mechanical stability, represented by the glue line shear strength, was positively affected by temperature and duration of the treatment.

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“…(BURGER; RICHETER, 1991). Vasconcelos et al, (1993) reported that species of the genus Couratari present high silica content, at the point that the process to obtain sawn wood from trunk could be harmed, because of the abrasive effect on the cutting tools.…”

Section: Spectral Behavior In the Visible Region Of The Electromagnetmentioning

confidence: 99%

Spectroradiometry of Commercial Wood Veneers in the Visible and Near Infrared Spectra

Lippert

Benedetti

Pereira

et al. 2013

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This study aimed to analyze the spectral response in ten commercial wood veneers from ten forest species, in the visible and near-infrared regions of the electromagnetic spectrum. Reflectance of samples was obtained using a Field Spec®3 spectroradiometer. Results were verified through the analysis of variance followed by a Tukey range test on multiple means, which showed significant differences in both the analyzed spectral regions for the studied species. The most expressive differences were observed in the visible region and occurred between the “tauari” and “nogueira” wood veneers. Those results may be due to the chemical properties of the analyzed material, to the cellulose content, to the proportion of the components in the cell wall and to the extractives in the lumen, to microfibril angle, density and to resistance and stiffness properties. Therefore, the applied technique was a tool capable to identify reflectance variations in regions of the electromagnetic spectrum which correspond to peculiar colorimetric characteristics of each species.Keywords: Spectroscopy; reflectance, spectral signature, wood veneers. ResumoEspectrorradiometria no visível e no infravermelho próximo de lâminas de madeiras comerciais. O presente estudo tem como objetivo analisar a resposta espectral na região do visível e no infravermelho próximo do espectro eletromagnético em laminas de madeiras de dez espécies florestais. As reflectâncias das amostras foram obtidas através do espectrorradiômetro Field Spec®3. Os resultados foram verificados por meio de análise de variância seguido do teste de múltiplas médias de Tukey, demonstrando existir diferenças significativas em ambas regiões do espectro eletromagnético nas espécies em estudo. As distinções de maior expressividade foram observadas na região do visível e ocorreram entre as laminas de madeira de tauari e nogueira. Essas respostas podem ser atribuídas às propriedades químicas do material investigado, bem como o teor de celulose, a proporção dos componentes presentes na parede celular e dos extrativos presentes no lume, à densidade, ângulo microfibrilar e às propriedades de resistência e rigidez. Dessa forma, a técnica empregada mostra-se como uma ferramenta capaz de registrar em regiões do espectro eletromagnético variações da reflectância que respondem à características colorimétricas peculiares de cada espécie.Palavras-chave: Espectroscopia; reflectância; assinatura espectral; lâminas de madeira.

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Observação Microscópica De Inclusões Minerais No Xilema De Espécies Tropicais Da Amazônia

Cited by 8 publications

References 4 publications

Wood Properties of Four Tropical Species from Mining Areas in the Amazon, Brazil Part 1: Anatomical Characterization

Wood Properties of Four Tropical Species from Mining Areas in the Amazon, Brazil Part 1: Anatomical Characterization

Properties of a Laminated Wood Composite Produced with Thermomechanically Treated Veneers

Spectroradiometry of Commercial Wood Veneers in the Visible and Near Infrared Spectra

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