311 research outputs found

    A efetividade do laser de HeNe 632,8 nm no reestabelecimento da integridade dos tecidos cutĂąneos em animais experimentais: revisĂŁo sistemĂĄtica

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    O objetivo desta revisĂŁo sistemĂĄtica foi analisar o efeito do laser de HeNe na cicatrização de feridas em ratos. Foram selecionados estudos experimentais que adotaram o laser HeNe para o tratamento de feridas agudas em ratos adultos saudĂĄveis, com lesĂ”es induzidas por bisturi, nas bases de dados PubMed/MEDLINE, LILACS e SciELO. Foram utilizados os seguintes descritores: cicatrização de feridas e colĂĄgeno, de acordo com o MeSH e o DeCS, alĂ©m dos unitermos laser HeNe e reparação da pele e seus equivalentes em inglĂȘs e espanhol. TrĂȘs estudos foram incluĂ­dos na revisĂŁo sistemĂĄtica, nĂŁo sendo possĂ­vel a realização de metanĂĄlise, devido Ă  impossibilidade de comparação entre as metodologias dos estudos selecionados. Todos os estudos realizaram anĂĄlise por meio de cortes histolĂłgicos das cicatrizes. A presença de falhas metodolĂłgicas nos trĂȘs artigos dificultou a interpretação fidedigna dos dados encontrados. Os estudos destacaram uma redução na intensidade da resposta inflamatĂłria e uma melhor organização das fibras colĂĄgenas no grupo irradiado. A terapia com laser HeNe mostrou boa resposta no reparo tecidual. No entanto, tais resultados devem ser analisados de modo criterioso, uma vez que hĂĄ presença de heterogeneidade, principalmente em relação aos parĂąmetros adotados

    Central odontogenic fibroma: a case report with long-term follow-up

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    An osteolytic tumour of the mandible with prominent expansive growth on the alveolar ridge and displacement of the involved teeth is described in a 28-year-old man. The lesion was diagnosed as a central odontogenic fibroma, an uncommon benign neoplasm derived from dental apparatus, and was removed by curettage. The patient remains asymptomatic after thirteen years of follow-up, which supports the claimed indolent behavior of this poorly documented disease and the adequacy of a conservative surgical treatment

    When agreement-accepting free-riders are a necessary evil for the evolution of cooperation

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    Agreements and commitments have provided a novel mechanism to promote cooperation in social dilemmas in both one-shot and repeated games. Individuals requesting others to commit to cooperate (proposers) incur a cost, while their co-players are not necessarily required to pay any, allowing them to free-ride on the proposal investment cost (acceptors). Although there is a clear complementarity in these behaviours, no dynamic evidence is currently available that proves that they coexist in different forms of commitment creation. Using a stochastic evolutionary model allowing for mixed population states, we identify non-trivial roles of acceptors as well as the importance of intention recognition in commitments. In the one-shot prisoner's dilemma, alliances between proposers and acceptors are necessary to isolate defectors when proposers do not know the acceptance intentions of the others. However, when the intentions are clear beforehand, the proposers can emerge by themselves. In repeated games with noise, the incapacity of proposers and acceptors to set up alliances makes the emergence of the first harder whenever the latter are present. As a result, acceptors will exploit proposers and take over the population when an apology-forgiveness mechanism with too low apology cost is introduced, and hence reduce the overall cooperation level.SCOPUS: ar.jinfo:eu-repo/semantics/publishe
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