QUALITY OF PLYWOODS OBTAINED FROM Melia azedarach COMBINED WITH Pinus taeda, PRODUCED WITH UREA-FORMALDEHYDE AND PHENOL-FORMALDEHYDE RESINS

AbstractThis study was developed to evaluate the quality of plywood produced from Melia azedarach in combination with Pinus taeda, glued with urea-formaldehyde resin (UF) and phenol formaldehyde (PF). Panels were produced using five veneers of Melia azedarach only, five veneers of Pinus taeda and also with faces made of Melia azedarach and core with Pinus taeda. The panels were evaluated by glue line shear tests and by static bending in parallel and perpendicular directions. The higher contents of extractives in Melia azedarach wood did not reduce the glue line shear strength between the layers. For both UF and PF glues, panels produced with veneers of Melia azedarach showed better results on static bending and glue line shear tests. The results indicate great potential of Melia azedarach wood in plywood production, both for internal use (UF), and for external use (PF).Keywords: Cinamomo; wood veneer; glue line. ResumoQualidade de painéis compensados de Melia azedarach em combinação com Pinus taeda produzidos com resina uréia-formaldeído e fenol-formaldeído. O objetivo deste trabalho foi avaliar a qualidade de painéis compensados de Melia azedarach em combinação com Pinus taeda, produzidos com resina ureia-formaldeído (UF) e fenol-formaldeído (FF). Foram produzidos painéis com todas as cinco lâminas de Melia azedarach e de Pinus taeda, e capas de Melia azedarach e miolo de Pinus taeda. Os painéis foram avaliados por meio de ensaios de cisalhamento da linha de cola e flexão estática paralela e perpendicular. Maiores teores de extrativos presentes na madeira de Melia azedarach não prejudicaram a resistência da linha de cola entre as lâminas. Tanto para a colagem uréica, quanto para a fenólica, os painéis produzidos com lâminas de Melia azedarach apresentaram melhores resultados nos ensaios de flexão estática e de cisalhamento da linha de cola. Os resultados obtidos indicam grande potencial da madeira de Melia azedarach para produção de painéis compensados, tanto para uso interior (UF), quanto para uso exterior (FF).Palavras-chave: Cinamomo; lâminas de madeira; linha de cola.AbstractThis study was developed to evaluate the quality of plywood produced from Melia azedarach in combination with Pinus taeda, glued with urea-formaldehyde resin (UF) and phenol formaldehyde (PF). Panels were produced using five veneers of Melia azedarach only, five veneers of Pinus taeda and also with faces made of Melia azedarach and core with Pinus taeda. The panels were evaluated by glue line shear tests and by static bending in parallel and perpendicular directions. The higher contents of extractives in Melia azedarach wood did not reduce the glue line shear strength between the layers. For both UF and PF glues, panels produced with veneers of Melia azedarach showed better results on static bending and glue line shear tests. The results indicate great potential of Melia azedarach wood in plywood production, both for internal use (UF), and for external use (PF).Keywords: Cinamomo; wood veneer; glue line

Cytotoxicity analysis of three Bacillus thuringiensis Subsp. israelensis d-Endotoxins towards insect and mammalian cells

Three members of the d-endotoxin group of toxins expressed by Bacillus thuringiensis subsp. israelensis, Cyt2Ba, Cry4Aa and Cry11A, were individually expressed in recombinant acrystalliferous B. thuringiensis strains for in vitro evaluation of their toxic activities against insect and mammalian cell lines. Both Cry4Aa and Cry11A toxins, activated with either trypsin or Spodoptera frugiperda gastric juice (GJ), resulted in different cleavage patterns for the activated toxins as seen by SDS-PAGE. The GJ-processed proteins were not cytotoxic to insect cell cultures. On the other hand, the combination of the trypsinactivated Cry4Aa and Cry11A toxins yielded the highest levels of cytotoxicity to all insect cells tested. The combination of activated Cyt2Ba and Cry11A also showed higher toxic activity than that of toxins activated individually. When activated Cry4Aa, Cry11A and Cyt2Ba were used simultaneously in the same assay a decrease in toxic activity was observed in all insect cells tested. No toxic effect was observed for the trypsin-activated Cry toxins in mammalian cells, but activated Cyt2Ba was toxic to human breast cancer cells (MCF-7) when tested at 20 mg/mL

Ecodesign in the use of the Amazonian Peãozinho wood for making an eco-efficient product

In the midst of the current logging scenario and the growing concerns and actions in favor of preserving the environment, research related to the insertion of new tree species in the market and about the design of products with low environmental impact are of paramount importance for the development of forest management and product design activities. Thus, The holistic view, which includes everything from the extraction of the raw material to the final disposal of the product, guided this research in order to show the technological potential of the species Micrandopsis scleroxylon W. Rodr. through machining and validation processes by making an eco-efficient product. The methodology adopted was: survey of the demand, designing of the concept, definition of the function, generation and materialization of alternatives, tests and refinements and presentation of the final solution. The results obtained in the process of machining the wooden material of the species were excellent throughout the process. It is believed that the approach inherent to small diameter trees, for the benefit of forest management, provides the understanding that it is possible to make use of them in the manufacture of the most varied wooden artifacts. Contributing to further research on Little Known Species

Evaluation of the quality of wood from naturally fallen tree for the development of products in Design

The sustainable use of forest resources in the Amazon is one of the precautions attributed to Conservation Units of sustainable use, and among them, the RESEX Auati-Paraná stands out in this study. In this area, a large volume of naturally fallen trees of various species belonging to different diametric classes were inventoried, with a higher incidence of trees with small diameter. Therefore, it is important to highlight the potential use of this raw material for development high value-added products as a sustainable income generation opportunity for community members. Thus, the objective of this research was to assess the quality of naturally fallen species through the development of products with a fine finish through technical design projects. For this, was used, defining the types of products and species (Micrandropsis scleroxylon and Simarouba amara) for the study, characterizing them, surveying the cultural aspects of the RESEX, manufacture of physical products prototypes and analyzing the quality of the wood workability during machining processes. The results obtained through the design projects, demonstrated the quality and feasibility of using wood from naturally fallen trees for the manufacture of products, being able to be explored as a sustainable alternative to generate economic benefits to the community through the valorization of such natural resources of the Amazon rainforest

ARBORIZAÇÃO DE ACOMPANHAMENTO VIÁRIO: UM ESTUDO SOBRE O CONJUNTO AVANHANDAVA EM ITUIUTABA-MG (2014)

O presente trabalho teve como objetivo a realização de um levantamento, mapeamento e caracterização da arborização de acompanhamento viário do Conjunto Avanhandava, na cidade de Ituiutaba - MG. A partir da pesquisa foi realizada a identificação dos diferentes tipos de árvores, além da reflexão sobre a complexa relação entre a arborização e equipamentos urbanos dispostos nas calçadas, a relação com transeuntes, bem como, tratar de alguns dos principais problemas advindos desta relação conflituosa, na qual, a árvore geralmente é menos favorecida. Foram levantados 168 indivíduos arbóreos, distribuídos em 27 espécies diferentes. Do total de árvores merece destaque a espécie Licania tomentosa (Benth.) Fritsch com 68,5 % do universo levantado. Também foi significativo o número de indivíduos de uma mesma espécie predominando sobre as demais, o que do ponto de vista técnico, não é aconselhável. Por fim, foi gerado um mapa com a localização das árvores levantadas, por meio do qual foi possível observar espaços sem arborização, ou seja, o bairro ainda possui um potencial e pode se tornar mais arborizado, desde que seja feito com acompanhamento técnico e espécies adequadas. Dessa forma, torna-se necessário que o poder público municipal desenvolva ações referentes à arborização urbana e programas de educação ambiental, no intuito de informar a população sobre a importância da arborização e, sobretudo, as maneiras corretas de lidar com a arborização viária

Calibration Of Stress Wave Timer for Amazonian Species

Non-destructive testing is increasingly being used on wooden structures. One of the preferred instruments for this task is the Stress Wave Timer, because it is portable and easy to use. This instrument needs to be calibrated to minimize possible reading errors. Tests were performed on samples of different sizes from four Amazonian timber tree species, with differing distances between the start/stop accelerometers and varying gain settings. The aim was to identify errors and find the best ratio between the Metricard SWT’s start and stop accelerometers. The best ratio was observed with settings of 40 for stop and 1 for start. The calculation of the confidence interval for the mean of the stress wave velocities expresses a degree of uncertainty ranging from 2% to 8%, regardless of the species and according to the start/stop ratio. A more in-depth evaluation led to the conclusion that the greatest degree of uncertainty occurs with short pieces. This confirms the need to calibrate the equipment, especially when using the instrument with pieces approximately equal to or less than 70 cm in length. The value for offset time (intersection of the line with the axes) was determined by a simple regression analysis, and indicated that the data correction factor varied from 1.9 to 2.2 depending on the start/stop ratio, at least in the samples studied

Physical-mechanical characterization of Amazonian woods by non-destructive methodology for the manufacture of EGP (Edge Glued Panel) panels

Studies of the technological properties of little-known native species are essential for an indication of sustainable management of the Amazon. The study aimed to evaluate the physical-mechanical performance of five Amazonian species obtained from an area managed in the Amazon by a non-destructive methodology, and to indicate their use to manufacture EGP panels. The samples were obtained from non-flooded secondary forest in the Amazon/Brazil (EEST/INPA). Fifteen trees were selected to determine the physical-mechanical properties, using the microwave system to determine the moisture, the apparent density test and the dynamic modulus of elasticity (MOEd). The microwave system presents better drying performance when compared to the conventional method (artificial drying), considering that the dry woods in this system present greater stability in the equilibrium moisture, and the woods from Murici, Breu vermelho and Angelim pedra presented content close to 12%, ideal moisture for EGP manufactures. The apparent density of the woods varied from 0.76 to 1.18 g.cm-3, classified as high density, following the standards of tropical woods. The studied woods presented MOEd of 11,175 to 14,109 MPa, thus demonstrating good resistance, and lower risk of deformation for the different uses, including for EGP panels, whether structural or not, being necessary to consider the type of adhesive. The quality of the studied woods presents a promising result for industrial indication, since they are mostly unknown or non-commercial woods, where technological characterization is a key tool to assist in decision making in the forest management plans that may indicate the use of new species in the forestry sector

Tibial plateau fractures fixation using posterior approaches - preliminary results of 12 cases

OBJECTIVE: To describe our preliminary results of posterior shearing tibia plateau fractures treated by a direct dorsal approach and plate fixation. METHODS: A consecutive series of twelve patients with tibia plateau fractures treated by direct posterior approach was selected from our database. Conventional radiographies, computed tomography scans and medical records were reviewed. All cases were followed to union, as defined by painless weight bearing and radiographic healing. RESULTS: Between July 2009 and April 2010, our trauma service received 89 tibia plateau fractures and treated 80 (89,9%) operatively. Twelve patients (13,5%) sustained posterior shearing tibia plateau fractures. All fractures were treated through the posterior approach, although 3 required association with an anterolateral approach as well. The mean age of patients was 35 years and mean follow-up was 12 (range 8-23) months. The fractures were classified according to AO/OTA: five 41 B1, four 41 B3, two 41 C1 and one 41 C3. There was one wound dehiscence, managed with local wound care, and one loss of reduction treated by reoperation. No patient sustained neurovascular injury, nonunion, malunions or knee instability. In four cases the reduction was rated as poor (> 2 mm step off), in five cases reduction was rated as imperfect ( 2mm de degrau articular), em 5 casos foi considerada imperfeita (< 2 mm de degrau articular) e em 3 casos obtivemos uma redução anatômica. CONCLUSÃO: Os autores concluem que o uso da abordagem posterior deve ser considerada em casos de fraturas com onde haja componente de cisalhamento posterior do planalto da tíbia. Uma casuística ampliada é necessária para avaliar o real benefício desta abordagem.UNIFESP Departamento de Ortopedia e TraumatologiaUniversidade Federal de São Paulo (UNIFESP), Escola Paulista de Medicina (EPM) Departamento de OrtopediaUNIFESP, Depto. de Ortopedia e TraumatologiaUNIFESP, EPM, Depto. de OrtopediaSciEL

Registry of adverse events related to health care that results in deaths in Brazil, 2014-2016

Objetivo: descrever os eventos adversos relacionados com a assistência à saúde resultantes em óbito. Métodos: estudo descritivo das notificações registradas no Sistema de Notificações para a Vigilância Sanitária (Notivisa) no Brasil, de junho/2014 a junho/2016; notificações registradas como ‘outros’ em ‘tipo de incidente’ foram reclassificadas. Resultados: foram registrados 417 óbitos, a maioria em adultos e idosos (85%), sem diferenças entre sexos; os estados de São Paulo (N=92), Paraná (N=75) e Minas Gerais (N=66) foram os maiores notificadores; os hospitais contribuíram com 97% dos registros, com concentração nos setores ‘terapia intensiva’ e ‘internação’; houve investigação pela unidade notificadora em 5% das notificações; na reclassificação do tipo de incidente, recuperaram-se 52 registros; o tipo de incidente mais comum foi ‘falhas durante a assistência à saúde’ (50%). Conclusão: notificações resultantes em óbito ocorreram principalmente em hospitais; foram identificadas falhas no registro e necessidade de investigação de grande proporção dos óbitos.Objective: to describe the adverse events related to health care resulting in death. Methods: a descriptive study of reports recorded in the Brazilian Health Surveillance Notification System (Notivisa) in Brazil from Jun 2014 to Jun 2016; notifications recorded as 'other' in the 'incident type' were recoded. Results: 417 cases were recorded, mostly in adults and the elderly (85%), with no sex differences; the states of São Paulo (N=92), Paraná (N=75) and Minas Gerais (N=66) were the main reporter; hospitals contributed to 97% of the records, principally in the intensive care and hospitalization sectors; the investigation by the notifying unit occurred in 5% of cases; in the recode of the type of incident, 52 records were recovered; the most common type of incident was 'failures during health care' (50%). Conclusion: notifications resulting in death occurred mainly in hospitals; were identified failure to register and need to investigate the large proportion of deaths.Objetivo: describir los eventos adversos relacionados con la asistencia sanitaria que resultaran en muerte. Métodos: estudio descriptivo de las notificaciones registradas en el Sistema de Notificaciones para la Vigilancia Sanitaria (Notivisa) en Brasil entre junio/2014-junio/2016; las notificaciones registradas como ‘otros’ en la variable ‘tipo de incidente’ fueron reclasificadas. Resultados: se registraron 417 casos, la mayoría en adultos y ancianos (85%), sin predominio de sexo; los estados de São Paulo (N=92), Paraná (N=75) y Minas Gerais (N=66) fueron los mayores notificantes; los hospitales contribuyeron con el 97% de los registros; la investigación por la unidad notificante se produjo en el 5% de los casos; en la reclasificación, se recuperaron 52 registros; el tipo de incidente más común fue ‘fallas durante la asistencia sanitaria’ (50%). Conclusión: las notificaciones de eventos resultantes de la muerte son principalmente de hospitales; se identificaron fallas en el registro y necesidad de más investigación de las muertes