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Obtenção de estruturas porosas altamente bioativas via sinterização do Biosilicato®
(Universidade Federal de São Carlos, 2009-04-07) Crovace, Murilo Camuri; Rodrigues, Ana Candida Martins; https://lattes.cnpq.br/4499231813051400; https://lattes.cnpq.br/2960564171443068
In the present work, scaffolds were obtained through the controlled sintering of Biosilicate®. This material possesses good mechanical properties and its bioactivity level is comparable to that of bioglasses, making it an interesting candidate for use as a scaffold to stimulate bone tissue regeneration. Previous studies have found that a secondary crystalline phase is formed when Biosilicate® is heat-treated at high temperatures (T > 700°C). The in vitro bioactivity tests revealed that the presence of the secondary phase is not harmful, but instead enhances the bioactivity of Biosilicate® to a level comparable to that of Bioglass - 45S5. Two different techniques were used in the synthesis of scaffolds: (1) the addition of porogen agents, and (2) the replication method. Five porogen agents were tested and compared: naphthalene, cassava starch, corn starch, polyethylene beads and carbon black. The first technique yielded scaffolds with a total porosity of 67 to 87% in a highly interconnected porous structure. The best result was achieved with carbon black, which resulted in an average pore size of 230 μm and a total porosity of 87%, making it the most promising porogen agent for application as a scaffold. The replication technique led to the formation of scaffolds with a total porosity of 96% and open cells in the range of 435 945 μm, with an average cell size of 650 μm.
Junto e misturado: imanência e transcendência no PCC
(Universidade Federal de São Carlos, 2009-04-07) Biondi, Karina; Villela, Jorge Luiz Mattar; https://lattes.cnpq.br/8301325600502054; https://lattes.cnpq.br/9293354732484739
The Primeiro Comando da Capital (PCC), a collectivity originated inside prisons in the state of São Paulo in the early 1990s, underwent deep transformations with the addition of Equality to its ideals. The incorporation of this principle has instituted a tension that infiltrates and runs through the capillaries of the PCC, effecting simultaneous formations and suppressions of power foci, alongside concurrent constructions and dissolutions of hierarchies. A series of mechanisms and strategies have been triggered in order to set up a Command between equals , establishing tensions in all its political dimensions. This work approaches the functioning of the PCC through the description of diverse plans by which its politics is operated. One of these plans concerns the PCC as a transcendental force, whose investigation led to theoretical wrings that enabled me to reflect about the construction of a transcendence by means of an immanentist anthropology, that is, an anthropology that allows the understanding of transcendence and the means of its production without considering it preeminent. It is the PCC-transcendence, produced in the immanence and to it mingled, that allows successive processes of deterritorialization concomitant to desindividualization phenomena, and supports the existence of this social formation without a firm territorial link, enabling the presence of the PCC even where we do not find its members.