[PDF] Top 20 An. Acad. Bras. Ciênc. - vol.81 número1

... is an important process (Krogh 1982a), due to the inverse relationship between magnetic susceptibil- ity and zircon Pb concentration (Mezger and Krogstad ... See full document

... Deakin and Graeff (1991) have suggested that active avoidance and escape strategies are related to learned and unlearned phobias, respectively (Table II). In con- trast to the situations that induce anxiety, in active ... See full document

... D E M OURA KCG, E MERY FS, P INTO CN, P INTO MCRF, D ANTAS AP, S ALOMÃ O K, C ASTRO SL AND P INTO AV. 2001. Trypanocidal activity of isolated naphtho-qui- nones from Tabebuia and some heterocyclic derivatives: A review ... See full document

... The potential solution should be solved numerically for each gap distance r. This potential could be computed from solving numerically an one dimensional Poisson-Boltzmann problem, with, for exemple, a collocation ... See full document

... of an accompanying pressure gradient, the large, positive electric field would drive electroosmotic flow in the direction of the bulk concentration gradient (from left to ... See full document

... Hydrated smectite clays such as montmorillonite are lamellar mineral crystals composed of charged layers separated by an aqueous solution. They exhibit special features towards hydration and ion fixation ... See full document

... Similar to Bixa orellana L. (Gomes and Bruno 1992) and Sebastiania commersoniana Braill. & Downs (Santos and Aguiar 2000), C. urucurana seeds germinated better when exposed to an alternating temperature ... See full document

... An additional piece of information may shed some light on the situation. Of the 102 most qualified Brazilian academic economists, 71% obtained their PhD in the US or Europe (mostly in UK). This is well above the ... See full document

... ene (Takaishi et al. 1997) along with the NOE cross peak between H-17 and H-14 α in the 1 H- 1 H- NOESY spectrum led us to established an equato- rial position for the C-17 methyl group, such as in the ... See full document

... Under an ANOVA model the numerator is the dif- ference between female and male ...Under an ANCOVA model the numerator uses the difference between covariance-adjusted ... See full document

... The reaction was performed in a fixed bed reactor at atmospheric pressure and feed containing 20% ethylene, 5% oxygen, 7% CO 2 balanced with N 2 (v), with a space velocity of 4000 h -1 . After 303 hours with time on ... See full document

... At last, it is important to stress that the effect of geometric amplification described here abso- lutely does not replace other mechanisms of production of large uniform fields, as the conventional dynamo effect, ... See full document

... Bacillus subtilis and some of its close relatives have a long history of industrial and biotechnological applica- tions. Search for antigen expression systems based on recombinant B. subtilis strains sounds attractive ... See full document

... as an adaptive condition to progressive neuronal loss with age, as greater functional demand is required from these neurons, which could result in a state of cellular ... See full document

... with an un- usually expanded crista prootica and the presence of an anterior prolongation of the parasphenoid reaching the basal tubera are the most striking fea- tures of MUCPv-334, different from the ... See full document

... Different cultures see the appearance of other insect species with funereal signs. The Aymara peo- ple from Bolivia took the presence of a certain rare moth as an omen of death. And the ancient Mexicans feared one ... See full document

... 2 AN is significantly larger than k 4 AN in each of the films, (2) that k 2 AN is almost the same in the two films at comparable temperatures, and (3) that the rate of formation of 4AN is slowed much ... See full document

... be an effective model for characterizing spatial biodiversity attributes (Muneepeerakul et ...it an important control on the dynamics of a metacommunity at the landscape ... See full document

... The breast milk retinol was extracted according to Giuliano et al. (1992), with adaptations. The method consisted of an alkaline hydrolysis and protein denaturation, using the potassium hydroxide (50%) and ethyl ... See full document

... was an active search for including the highest possible number of smokers in this study aiming at performing genetic ...to an underrepresentation of non- smokers in the ... See full document