Aluno do Curso Técnico em Química do IFRJ. Bolsista pesquisador (a) do LMGR Resumo O uso de fontes fósseis de energia primária tem se mantido estável no mundo, sem perspectivas de mudanças de cenários. O carvão vegetal é uma destas fontes. A queima da madeira para sua obtenção emite, para a atmosfera, componentes que, se coletados através de processos simples, possibilitam aproveitamento comercial significativo com grande potencial de expansão de seu uso. O objetivo deste trabalho foi realizar práticas iniciais de caracterização do extrato pirolenhoso através de destilação fracionada no Laboratório Multidisciplinar de Gerenciamento de Resíduos no IFRJ campus Duque de Caxias. Para realização dos ensaios amostrou-se uma massa de 300g do extrato bruto, sendo calculado o seu rendimento após o processo de destilação. Quantificou-se a massa de alcatrão (fase pesada), o líquido pirolenhoso (fase mais leve com todos os seu constituintes) e a perda no processo. As comparações estequiométricas apresentaram, embora com pouca variabilidade nos resultados, uma tendência média do rendimento de aproximadamente 64% das amostras com o líquido pirolenhoso. 30% do material destilado caracterizou-se como alcatrão. Em relação às perdas no processo, a média percebida foi de 6% para as cinco amostras analisadas.
To evaluate the use of demineralized bone matrix of caprine origin in experimental bone defects of the tibia in New Zealand rabbits. Methods: Fragments of the tibia diaphysis were collected aseptically from clinically healthy goats. The bones were sectioned into 1 cm fragments and stored at-20°C for subsequent hydrochloric acid (HCL) demineralization. A 70 mg portion of DBMc was used to fill the experimental bone defects. Twenty-four female adult New Zealand rabbits were divided into 2 groups: the MG (matrix group, left tibia) and CG (control group, right tibia). Additionally, they were separated into 4 groups with 6 animals, according to the period of analysis (15, 30, 60 and 90 days postoperatively). Using microCT, volumetric parameters were evaluated: bone volume, relationship between bone volume and total volume, bone surface area, relationship between bone surface area and total volume, number of trabeculae, trabecular thickness and trabecular separation. Results: There was a statistically significant difference (P<0.05) between groups considering bone volume (BV) and bone:total volume (BV/TV), on 15, 30 and 90 days postoperatively. Control group showed a statistically significant superiority (P < 0.05) considering the mean of the variables bone surface (BS), number of trabeculae (Tb.N) and between bone surface and total volume (BS/TV) at 15 and 90 days. Conclusions: Caprine demineralized bone matrix was safe and tolerable. No signs of material rejection were seen macroscopically. It is an alternative for the treatment of bone defects when autologous graft is not available or in insufficient quantities.
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