How Informative Are Interest Rate Survey-based Forecasts?

This paper studies the information content of survey-based predictions for the Brazilian short-term interest rate. We perform vector autoregression analysis to test for the dynamic relationship between market expectations of interest rates and spot interest rates, and a single regression forecasting approach. Empirical results suggest that surveys may be useful in assessing market expectations (contain relevant information) and in building Central Bank credibility. Within an inflation targeting framework they are crucial in order to receive timely feedback on market sentiment regarding the conduct of monetary policy

Sobre o feminino e a cidadania em Pompéia

Nos últimos anos, novos trabalhos tem questionado os antigos paradigmas interpretativos que excluíam a mulher do espaço público e do grupo de cidadaos. O objetivo deste artigo é refletir sobre a idéia equivocada do confin amento feminino ao lar e de sua exclusao da vida pública e do poder, durante o século 1 d.C. A análise de inscriçoes parietais de Pompéia tem sido importante para questionar esta imagem sobre as mulheres romanas.In the last years, recent studies have been criticising interpretative paradigms that have been excluding the women from the public space and citizeruy. The aim of this article is to make us think about the wrong idea of the female confinement at home and her exclusion from public life and levels of power, during the 1 century a.C. The analysis of several inscriptions from Pompeii has been important in order to put discuss the image of Roman women

Fertirrigação.

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Fertirrigação.

Embora a fertirrigação apresente vantagens, existe uma carência de informações sobre período de aplicação, freqüência, doses e tipos de fertilizantes para a maioria das culturas irrigadas

Fluctuation theorem applied to Dictyostelium discoideum system

In this paper, we analyze the electrotactic movement of Dictyostelium discoideum from the viewpoint of non-equilibrium statistical mechanics. Because we can observe fluctuating behavior of cellular trajectories, we analyze the probability distribution of the trajectories with the aid of the fluctuation theorem. Recently, the validity of the fluctuation theorem was verified in a colloidal system, and it has also been applied to granular systems, turbulent systems and chemical oscillatory waves to investigate some of their statistical properties that are not yet completely understood. Noting that the fluctuation theorem is potentially applicable to cellular electrotaxis, here we employ it to help us obtain a phenomenological model of this biological system.Comment: 2 pages, to appear in J. Phys. Soc. Jp

DODAB and DODAC bilayer-like aggregates in the micromolar surfactant concentration domain

In the millimolar concentration domain (typically 1 mM), dioctadecyldimethylammonium bromide and chloride (DODAX, X representing Br- or Cl- counterions) molecules assemble in water as large unilamellar vesicles. Differential scanning calorimetry (DSC) is a suitable technique to obtain the melting temperature (Tm) characteristic of surfactant bilayers, while fluorescence spectroscopy detects formation of surfactant aggregates, like bilayers. These two techniques were combined to investigate the assemble of DODAX molecules at micromolar concentrations, from 10 to 100 micromolar. At 1 mM surfactant, Tm ~ 45 ºC and 49 oC, respectively for DODAB and DODAC. DSC and fluorescence of Nile Red were used to show the formation of DODAX aggregates, at the surfactant concentration as low as 10 micromolar, whose Tm decreases monotonically with increasing DODAX concentration to attain the value for the ordinary vesicles. The data indicate that these aggregates are organized as bilayer-like structures.Fundação para a Ciência e a Tecnologia (FCT

Fontes e doses de nitrogênio aplicadas via fertirrigação na formação de mudas de maracujá amarelo.

Este trabalho teve como objetivo avaliar os efeitos de três fontes de N (nitrato de cálcio, ureia e sulfato de amônia) e de cinco doses (0,0; 0,5; 1,0; 1,5 e 2,0g de N por planta)via água de irrigação na produção de mudas de maracujazeiro amarelo