[PDF] Top 20 An. Acad. Bras. Ciênc. - vol.74 número3

... In an attempt to study the inter- action of the two adenylate cyclase systems (adeno- sine and dopamine -dependent) present during de- velopment of the chick retina, we performed exper- iments using retinas from ... See full document

... shown an opposite effect of ...length, an effect that was abolished by treatment with α-Bgt, indicating the involvement of α7-containing nAChRs in this ...that an optimal level of intracellular ... See full document

... Graphic granite also was used as a synonym for granitic pegmatite for a long time, since the graphic inter-growth was considered as an indispensable el- ement to identify a pegmatitic rock. Graphic is the typical ... See full document

... Wheat seeds (var. BRS-49) were disposed on sterilized humid sand, without light incidence, for three days. The first 2 mm (apical part) of five etiolated seedlings were discarded and coleoptiles (the following 4 mm) were ... See full document

... to metabolic processes, initiation and promotion of can- cer and tissue injury by free radicals, which has induced the intake of antioxidant products as chemical factors that prevent the onset of diseases (Núñez-Sellés ... See full document

... The “Klason”-lignin content in the samples varied between 19.8% and 25.8%. In the heartwood samples, the lignin content was higher than in the sapwood. The higher content of “Klason”-lignin in the heartwood might be ... See full document

... is an important role to the sustainability of the apiculture because it rep- resents a continuous food offering, which supplies the lack of blossom in the ...for an effective stock to the pollination of ... See full document

... Let  be an open connected subset of R n , and consider 8() = {F ∈ C ∞ (, R n ) : det(DF)(x) 6= 0 ∀x}. We denote an element of 8() by F = (f 1 , . . . , f n ) . A very basic problem in Mathematical ... See full document

... The compounds were identified using a GC-MS unit (model GCMS-QP5050A, from Shimadzu, Japan) equipped with a DB-5 fused silica column (30 m × 0.22 mm i.d., film thickness 0.25 μm) and interfaced with an ion trap ... See full document

... the organic and reductive phases also occurred, while the carbonatic phase occurred in the speciation of Mn in less proportion, except in station 1, which showed a percentage of almost 20%. Great parts of manganese occur ... See full document

... established an estimator that combined the presence of food – the proportion of samples (n = 840) with fallen fruit or flowers – and its importance in the diet by ... See full document

... The relative importance of site versus substrate was assessed based on a partial canonical correspondence analysis (pCCA). This analysis used the taxa density matrix to partition the results into independent components, ... See full document

... Simplex centroid design is very useful in establishing optimal proportions among the various components of a mixture. In ultrasound- assisted extraction, acid solutions are usually used as extracting agents due to their ... See full document

... is an example of an integrated regional study carried out by an international science program – indeed, the largest program in international scientific coopera- tion ever focused on the Amazon ...had ... See full document

... tion to the northwestern portion of the Serra do Marumbi – which corresponds to a state park – is prohibited, such that fieldwork was limited to the northern and southwest- ern portions of the pluton. The gamma-ray maps ... See full document

... shows an evolution charac- terized by the alternation of depositional intervals, with accumulation of thick sedimentary and vol- cano sedimentary sequences and dominantly ero- sive ...represents an ... See full document

... Hermit crabs represent a very important macro- zoobenthic group within the intertidal and sublit- toral communities. They have an important role in the marine trophic chain (Fransozo et al. 1998). Consequently, ... See full document

... of radioactivity (Trivelin et al. 1979, 2002, Eriksen 1996, Máximo et al. 2000). In studies developed for the isotopic separation of 34 S, Bendassolli et al. (1997) mentioned that the use of stable isotopes is an ... See full document

... The genus Lonchocarpus encompasses 150 species, including 24 native to Brazil. L. montanus is a new native species (A.M.G.A. Tozzi, unpublished data). The botanical classification was based on morphology of the flowers ... See full document

... The fish immune system is responsible for destroying microorganisms through acquired and innate components, with humoral and cellular process that perform together in an attempt to prevent the outbreak of ... See full document