Cimento de aluminato de cálcio: uso em defeitos ósseos induzidos em fêmur de coelhos / Calcium aluminate cement: used in bone defects induced in the femur of rabbits

Avaliou-se o comportamento do cimento de aluminato de cálcio em defeitos ósseos induzidos experimentalmente em fêmur de 12 coelhos Nova Zelândia Branco, distribuídos em três grupos experimentais, correspondentes aos tempos de observação pós-operatória de 15 (G15), 30 (G30) e 60 (G60) dias. Realizaram-se avaliações clínico-cirúrgicas, radiográficas e histológicas, a fim de se observar o potencial osteoindutor e osteocondutor do biomaterial no defeito ósseo, e se houve osteointegração. O cimento de aluminato de cálcio, na formulação utilizada, mostrou-se biocompatível, porém não atuou como osteocondutor ou osteoindutor.(AU)

The patterns of the calcium aluminate cement in bone defects experimentally induced in the femur of 12 New Zealand White rabbits were evaluated. The animals were distributed in three experimental groups, corresponding to postoperative observation periods of 15 (G15), 30 (G30) and 60 (G60) days. Clinical, surgical, radiographic and histological appraisals were made to observe the osteoinductor and osteoconductor potential of the biological material, as well as the bone integration. The calcium aluminate cement formulation was biocompatible, but has not acted as a osteoconductor or osteoinductor.(AU)

Otimização de método analítico para determinação de aflatoxinas em rações de caprinos e ocorrência no estado da Bahia / Optimization of analytical method for aflatoxins determination in goats feedstuffs and their occurrence in the state of Bahia

The optimization of the thin layer chromatography (TLC) method to determine aflatoxins in feedstuffs and the evaluation of their occurrence in feedstuffs for milk-yielding does in the state of Bahia were studied. Eighty feedstuff samples were collected from five farms, located in the Recôncavo Baiano, from November 2000 to August 2002. The samples were analyzed using TLC modified method. In this study, the detection and quantification limits were 5 and 8m g/kg, respectively. The percentage of average recoveries obtained for AFB1, AFB2, AFG1, and AFG2 were 81.0; 97.2; 89.3; and 90.3 percent, respectively; and the coefficient of variation ranged from 0.83 to 4.1 percent. The results revealed that the optimization of TLC methodology is efficient to analyze aflatoxins in feedstuffs. The presence of these aflatoxins was not detected in any of the analyzed samples, demonstrating good quality of those products, regarding the contamination by these toxins.(AU)