Organic memories (non‐optical) constitute an exception in the recent rapid growth of the literature related to organic electronic devices. Going against this trend, the authors present the electrical characteristics of switching devices based on a poly(methacrylate) derivative with pendent anthracene chromophores, MDCPAC. This material combines the excellent thin‐film mechanical properties of poly(methacrylate) with anthracene's interesting electronic properties. MDCPAC is shown to have the basic properties required for binary information storage and potential for organic memory applications.

This study quantitatively evaluated the fluorescence intensity of resin composites with different opacities and translucencies and determined changes in fluorescence after accelerated aging, using human enamel and dentin as controls. Six microhybrid and nanofilled composites, each in three different shades, were tested. Ten sound human incisors were used to obtain enamel and dentin specimens separately. Fluorescence measurements were obtained with a fluorescence spectrophotometer before (baseline) and after accelerated aging at 150 kJ energy for 120 hours. One-way analysis of variance (ANOVA) and Games-Howell multiple comparison tests were performed at a significance level of 0.05. Student's t-test was also used for comparison before and after aging. At baseline, there was no statistically significant difference (p>0.05) between the fluorescence intensity of dentin and any of the shades of Charisma or Opallis, Esthet-X dentin shade or Vit-l-escence enamel, or the translucent shades. After accelerated aging, all shades of the 4 Seasons, enamel and the translucent shades of Esthet-X had fluorescence intensities statistically similar to that of aged dentin (p>0.05). A significant reduction in fluorescence after aging (p<0.05) was observed for all the materials, except for human enamel and translucent Filtek Supreme XT. Accelerated aging reduced fluorescence in most of the composites evaluated.

An electroluminescent polymer in which the chromophoric pendant groups are attached to a nonconjugated main chain, poly (stilbenyl-p -methoxy styrene), has been synthesized by a Williamson condensation of poly(p-acetoxystyrene) and p-(chloromethyl)stilbene. Characterization was carried out by NMR, FTIR, DSC, and elemental analysis. When used as the active layer of a light-emitting diode, emission was observed with a spectral maximum at 450 nm.

O fenômeno das condutas juvenis tem sido alvo de interesse na ciência social e humana, principalmente aquelas que conduzem à delinqüência. Apesar de inúmeras variáveis conseguirem explicá-lo, o construto busca de sensações vem contribuindo muito para isso, pois ele enfatiza as diferenças individuais. A partir da perspectiva personalística, aponta a avaliação do grau com que os jovens pretendem viver experiências em correr riscos e sua predisposição a sensações de novidades e intensidades. 504 jovens, entre 11 e 20 anos, responderam o questionário de condutas anti-sociais e delitivas e de busca de sensação, de Arnett. Observou-se que a busca de intensidade e de novidades se relacionaram diretamente às condutas anti-sociais e delitivas. Esses resultados permitem supor que as variáveis personalísticas ainda têm bastante contribuição quando se pretende explicar a conduta juvenil delinqüente a partir da orientação de atitudes frente à excitação e ao investimento de atividades permeadoras de risco.

A new fluorescent polystyrene derivative is reported in which a stilbene-based chromophoric pendant group is attached on average to each third monomeric unit. Poly[styrene-co-(p-(stilbenylmethoxy)styrene)] showed fluorescence emission from intra-and interchain interaction. The model compound p-((p-ethylphenoxy)methyl)stilbene is the first stilbene derivative to show aggregate emission in solution at room temperature reported to date. It is proposed that the emission originates from the association of chromophores in the ground state forming a fluorescent dimer or aggregate complex.