, utilizando a resina uréia-formaldeído na proporção de 8% de sólidos -base peso seco das partículas. Os painéis foram prensados com pressão específica de 4,0 MPa, temperatura de 160 ºC e tempo de prensagem de oito minutos. As avaliações dos resultados de ensaios obtidos nesta pesquisa indicam a viabilidade técnica de utilização das nove espécies provenientes de florestas tropicais da Amazônia na produção de painéis de madeira aglomerada, com destaque para Ecclinusa guianensis Eyma (Caucho) que, de uma forma geral, apresentou melhores resultados de propriedades físico-mecânicas. PALAVRAs-CHAVe: Painéis aglomerados, madeiras tropicais, uréia-formaldeído. , using the urea-formaldehyde resin in the proportion of 8% of solid content based on oven dried wood particles. The boards were pressed at the specific pressure of 40 kgf/cm², temperature of 160 ºC and press time of eight minutes. The evaluations of test results obtained in this study indicate the potential use of the nine species from Amazon rainforest in the production of particleboard, highlighting Ecclinusa guianensis (Caucho) that, in general, showed better results of physical and mechanical properties. Evaluation of the properties of particleboard made from sawmill waste of nine tropical wood species of Amazon

Avaliou-se a variabilidade da tratabilidade da espécie madeireira Brosimum rubescens Taub. Moraceae (pau-rainha), abordando três diferentes alturas do tronco (base, meio e ápice) e duas partes (cerne e alburno). O processo utilizado foi o de impregnação sob pressão, através do método de célula-cheia ou Bethell, e o preservante foi o CCA, tipo A, a 2% de concentração. A análise da variabilidade deu-se em função da retenção. Ao comparar os dados de retenção (kg/m³) das diferentes alturas e partes do tronco, constatou-se que o grau de tratabilidade do alburno é moderadamente difícil, enquanto o cerne é refratário. Os resultados de retenção das toras estudadas nas diferentes alturas da árvore não apresentaram diferença significativa, entretanto existe diferença significativa de retenção entre as partes (cerne e alburno). A análise de microdistribuição do preservante através do estudo anatômico funciona como ferramenta auxiliar na interpretação desses resultados.

An experiment was conducted in a primary forest area of the Tropical Forest Experimental Station, 45 km from Manaus-Boa Vista Highway, in order to compare the insect fauna of the subfamily Scolytinae, in flight activity and on the ground. Five impact traps of the type Escolitideo/Curitiba, with ethanol baits, were installed at the height of 3 m above the ground, and five pitfall traps were buried in the same area of the above ground traps. The data collections were evaluated through abundance, richness, and Simpson diversity index, and, to compare these data with the pitfalls and the months collection, the ANOVA was used. The Pearson correlation test was also carried out to evaluate the meteorological factors (temperature and rainfall). From the total of 2,910 Scolytinae, 2,341 were captured in pitfall traps representing 80.45% and 569 with Escolitideo/Curitiba traps representing 19.55%. The most abundant species in the collections wereXyleborus volvulusFabricius andXyleborus affinisEichhoff, and this was classified as constant in both habitats. The result of the analysis indicates that the Simpson’s index was high and that the abundance of insects was affected by the types of trap and by the month of collection. The analysis of correlation with meteorological factors showed that onlyXyleborus spinulosusspecies presented significant correlation with temperature.

One of the most expensive steps in mushroom production is the disinfection of the substrate. This study aimed to evaluate different methods of disinfecting various substrates used in the cultivation of Pleurotus ostreatus from the Amazon. P. ostreatus was grown under uncontrolled temperature conditions in a greenhouse (at approximately 30 °C) on substrates formulated with residues (seeds) of açaí and tucumã palm trees, Brazil nuts shell and pine sawdust. The different substrate disinfection treatments comprised autoclaving, immersion in hot water or immersion in calcium hydroxide (2%). The chemical composition of residues, substrates, and mushrooms was analyzed. During cultivation, it was found that in the treatment with hot water, all the bags were contaminated, and treatment with calcium hydroxide inhibited the colonization and growth of the mushrooms. P. ostreatus grown on the autoclaved açaí substrate supplemented with tucumã had higher production. The highest percentage of fiber content was obtained when the mushrooms were cultivated in the pine substrate supplemented with Brazil nuts (32.68 to 33.65%), and the highest protein content (20.03 to 20.88%) was found in the mushrooms grown on açaí-based substrates. Considering that P. ostreatus showed higher productivity in autoclaved substrates, further studies should be performed to develop alternative methods of disinfecting substrates for the cultivation of mushrooms in the Amazon region, as well as, in other regions with a tropical climate. However, the cultivation of this mushroom is promising using some regional substrates, especially with açaí, which is one of the important natural products of the Amazon.

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