[PDF] Top 20 An. Acad. Bras. Ciênc. - vol.82 número3

... 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

... around 82 ◦ C (Quirino and Vale 2002), and the glass transition range of lignin must be used to relief the residual growth stress of trees (Romeiro de Aguiar and Perré ... See full document

... Few data are available about the reproduction of the deer in subtropical forests, such as those located at the southern limits of its distribution, like the premon- tane forest in northwest Argentina. This eco-region has ... See full document

... towards an in vivo cancer model, ascite-bearing female mice between 7 and 9 days postinoculation were sacrificed by cervical dislocation and a suspension of Sarcoma 180 cells was harvested from the intraperitoneal ... See full document

... has an intense affinity with the organic phase in the Estrela River ...found an intense association of this element with this chemical phase in the study ... 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

... 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

... 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

... 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

... 25922), respectively. A suspension of the tested mi- croorganism (0.5 of MacFarland Scale) was spread on Petri plates with Mueller Hinton agar (Difco Laborato- ries). A 2 mm hole diameter was opened on the surface of ... 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

... 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

... The creation of independent national and local ca- pacity is not necessarily a panacea either, and has its own minefields. Independence is not necessarily easy nor total in a context of globalization in science and so- ... See full document

... The tests were carried out with three replicates, in which we varied the amount of ammonia (0.73, 1.46, and 2.20 mols), corresponding to 50, 100, and 150 mL of 25% m/v aqueous ammonia, in order to obtain the best ... See full document

... In R. prolixus, VT native molecular mass is 430 and 260 kDa (Chalaye 1979). The native particles dissociate in four subunits under denaturing con- ditions. The molecular mass of the subunits are 180 kDa, 158 kDa, 50 kDa ... See full document

... Let p be the reduced singularity of F whose quotient of eigenvalues is not rational nor a root of unity. If F admits an invariant algebraic curve C we can suppose without loss of generality that C is reduced and ... See full document

... Subvolcanic rocks are monzonites and quartz monzonites and occur as small intrusions around the Lavras Granite Complex. These rocks occur in two different facies: a porphyritic one with phe- nocrysts of plagioclase ... 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

... The monzodiorites are massive, leuco- to mesocratic rocks (CI: 30-35), characterized by equigranular fine- grained texture. These rocks are easily distinguished from the other varieties due to the large quantities of ... 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