Rheological behavior of pineapple and mango pulps

The rheological behavior of whole and centrifuged mango (Mangifera indica L. var. Keitt) and pineapple (Ananas comusus L. merr var Perola) pulps was analysed at 30 degreesC, in a rotational viscometer Haake Rotovisco RV-20. The experiments were conducted with measuring system of 45 mm diameter parallel plates (PQ45) with gap of 0.5 mm, at shear rates up to 874 s(-1). The rheograms were fitted with Casson, Ostivald-of-Waelle and Mizrahi-Berk (M-B) models. The Brix of pineapple and mango pulps were 16.6 and 13.3 degreesBrix, respectively, and the insoluble solids content was 0.108 g/kg for mango and 0.054 g/kg for pineapple. The best adjustment was obtained with M-B model. It was observed that the pulps presented pseudoplastic behavior, and the suspended solids had great influence on the consistency index. (C) 2002 Elsevier Science Ltd. All rights reserved.35864564

The comparative analysis of homologous fresh frozen bone and autogenous bone graft, associated or not with autogenous bone marrow, in rabbit calvaria: a clinical and histomorphometric study

The aim of this study was to evaluate the potential of fresh frozen homologous and autogenous grafts, associated or not with autogenous bone marrow, to form bone. Sixty titanium cylinders were used, and were fixed to the skulls of 30 rabbits. These cylinders were filled with (A) autogenous bone (AM) autogenous bone associated with the bone marrow (H) fresh frozen homologous bone (HM) fresh frozen homologous bone associated with the bone marrow (M) pure autogenous bone marrow and (C) blood clot. the animals were sacrificed after 02 and 03 months. After clinical evaluation, the samples were stained with hematoxylin, eosin and Mallory Trichrome dyes for optical microscopy analysis and histomorphometric analysis. Experimental groups that received mineralized materials (A, AM, H, HM) showed the best bone formation results, presenting no statistical difference between them (P > 0.05). Groups that did not receive mineralized materials (M and C) showed the worst results (P < 0.05), but the M group showed better results than the C group. Most of the autogenous and homologous bone particles were resorbed and there was a larger amount of residual particles in the homologous graft (H, HM) when compared with the autogenous graft (A, AM; P < 0.05). These findings suggest that fresh frozen homologous grafts produced similar amounts of new bone when compared with the autogenous grafts. However, the amount of residual bone particles was larger in the homogenous groups, which may indicate a slower remodeling process. the homologous fresh frozen bone seems to be a good osteoconductive material. the use of only autogenous bone marrow showed better results when compared to the bood clot. However, this research indicates that association with mineralized materials is required.Sao Leopoldo Mand Dent Sch, Campinas, SP, BrazilUniversidade Federal de São Paulo, Sch Med, São Paulo, BrazilUniv Santo Amaro, São Paulo, BrazilUniversidade Federal de São Paulo, Sch Med, São Paulo, BrazilWeb of Scienc