RESUMO
Este artigo integra um projeto de pesquisa que tem por objetivo discutir eventuais relações entre as teses de John Dewey e a filosofia grega clássica, especialmente em torno da noção de conhecimento ou ciência, no intuito de compreender os mecanismos de "apropriação" e "recontextualização" presentes na elaboração de discursos pedagógicos. Para isso, analisamos o livro Como pensamos, em que se encontram os fundamentos da teoria lógica deweyana, procedendo a uma interpretação das idéias do autor à luz do pensamento de Aristóteles. As conclusões indicam haver certas aproximações e diferenças entre as concepções dos dois filósofos, o que permite formular algumas hipóteses para novos estudos acerca das relações entre Dewey e Aristóteles.
This article is part of a research project whose goal is discussing occasional relations between John Dewey's thesis and the classical Greek philosophy, especially concerning the notion of knowledge or science. We intend to understand the mechanisms behind the "appropriation" and "re-contextualization" in Pedagogical discourses. In order to do so, we analyzed the book How we think, in which the fundamentals of Dewey's logical theory can be seen, proceeding to an interpretation of his ideas based on Aristotle's. Our conclusion points to some similarities and distinctions between the two philosophers' conceptions, allowing us to raise some new hypothesis for further studies about relations between Dewey and Aristotle.
RESUMO
Valeriana officinalis extracts are used in folkloric medicine for their sedative, hypnotic and tranquilizer effects. Using [3H]flunitrazepam binding as an indicator, the interactions of commercial Valerian extracts with GABA(A) receptors were examined. There was considerable fluctuation among the different extracts, some mildly enhanced [3H]flunitrazepam binding, others had no effect and others had inhibitory effects, independent of standardization by valerenic acid. Central depression can also be accomplished by a reduction of excitatory transmission. Valerian extracts had modest inhibitory effects on [3H]MK-801 binding, an indicator of NMDA-Valerian interactions. Spectral analyses (UV region) did not show marked differences among the different extracts. The inhibitory effects of one of the extracts on [3H]flunitrazepam binding was somewhat stable, while on [3H]MK-801 binding the inhibitory effects were lost within months. These results suggest that particular care should be taken in analysing and interpreting results from commercial Valerian preparations.
