Edilene Silva Ribeiro

Intemperismo Artificial em Lâminas de Tectona grandis Tratadas com Produtos de Acabamento

This study aims to evaluate the effects of weather exposure to artificial weathering in the color of teak wood veneer treated with finishing products. The samples received 2 types of products, the sealer and the stain, plus witnesses, unfinished. The experiment was conducted in a completely randomized design with 3 treatments and 4 replications. Slides were exposed to QUV-Accelerated Weathering Test simulator for 7 periods as follow: 6, 12, 24, 48, 96, 192 and 384 hours. Color measurements were made after each period of weathering using the spectrophotometer Color Eye XTH. The chromatic variables evaluated were: L *, a *, b *, C * and h*. The study concluded that the teak wood veneer had color alterations with the exposure time and the stain was more efficient in preserving the wood color.

Formigas (Hymenoptera: Formicidae) Bioindicadoras de Degradação Ambiental em Poxoréu, Mato Grosso, Brasil

This work aimed to evaluate the ant species occurring in an area degraded by diamond mining, defining the bioindicators of this degradation. The present study was conducted bimonthly in the municipality of Poxoreu, Mato Grosso state, between June 2010 and April 2011. Four environments were sampled: A1 - area degraded by mining, A2 - area of Cerrado vegetation with recent anthropic activities, A3 - area of Cerrado disturbed approximately 30 years ago, and A4 - area of preserved Cerrado. In each environment, 11 pitfall traps, equidistant 15 meters, were installed to collect ants for 24 hours. The individuals were taken to the Laboratory of Forest Protection/FENF/UFMT and screened for later identification. The bioindicator species were indicated by faunal analysis. The ant species Camponotus (Myrmaphaenus) sp.1 and Forelius brasiliensis can be considered bioindicators of environmental degradation in the areas of ​diamond ​mining and human disturbance, while the species Camponotus atriceps, Pachycondyla crassinoda and Paraponera clavata can be considered bioindicators in the preserved Cerrado area.

Formigas (Hymenoptera: Formicidae) Bioindicadoras de Degradação Ambiental em Poxoréu, Mato Grosso, Brasil / Ants (Hymenoptera: Formicidae) as Bioindicators of Environmental Degradation in Poxoréu, Mato Grosso, Brazil

This work aimed to evaluate the ant species occurring in an area degraded by diamond mining, defining the bioindicators of this degradation. The present study was conducted bimonthly in the municipality of Poxoreu, Mato Grosso state, between June 2010 and April 2011. Four environments were sampled: A1 - area degraded by mining, A2 - area of Cerrado vegetation with recent anthropic activities, A3 - area of Cerrado disturbed approximately 30 years ago, and A4 - area of preserved Cerrado. In each environment, 11 pitfall traps, equidistant 15 meters, were installed to collect ants for 24 hours. The individuals were taken to the Laboratory of Forest Protection/FENF/UFMT and screened for later identification. The bioindicator species were indicated by faunal analysis. The ant species Camponotus (Myrmaphaenus) sp.1 and Forelius brasiliensis can be considered bioindicators of environmental degradation in the areas of ​diamond ​mining and human disturbance, while the species Camponotus atriceps, Pachycondyla crassinoda and Paraponera clavata can be considered bioindicators in the preserved Cerrado area.