[PDF] Top 20 An. Acad. Bras. Ciênc. - vol.79 número3

... Compound 1 gave a molecular ion [M] + at m /z 390.18314 in HREIMS which corresponds to C25 H 26 O 4 (calc. 390.18311). The NMR data (Table III) were very similar to those of the dibenzoylmethane derivative described ... See full document

... Fig. 1 – The Graciosa Province in southern Brazil (left panel). The main tectonic units in southern Brazil are indicated - A: Ribeira Fold Belt, B: Curitiba Microplate, C: Luiz Alves Microplate, D: Coastal Granitoid ... 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

... is an increase of their ductibility due to their amorphous components of viscoelastic properties (lignin and hemicelluloses), which are responsible for wood softening and its relief from growth stress levels ... See full document

... from an economic point of view, but not from an ecolog- ical perspective, since byproducts and/or residues are ...reason, an effective excess am- monia recovery system becomes important, as well as ... See full document

... The births of brown brocket deer (Mazama gouazoubira) in a secondary lower montane forest called “yunga” in northwestern Argentina were compared with rainfall. Analyses were performed with rainfall and flower-fruit fall ... See full document

... ent. An example is 2,4-dichlorophenylacetic acid (2,4- D), which is commercially employed as a herbicide, but can be used as an auxin to promote plant growth in tis- sue cultures (Pasqual ... 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 averages for the content of diastase index do not differ (P>0.05) between the two groups. The aver- age of the diastase index in non-organic honey was 29.76 (Gothe scale) to an interval from 16.31 to 38.83, ... 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

... 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 Neoproterozoic shoshonitic and mildly alkaline bimodal volcanism of Southernmost Brazil is repre- sented by rock assemblages associated to sedimentary successions, deposited in strike-slip basins formed at the ... See full document

... et al. 1998). This study is part of a contribution to improve the knowledge of the hermit crab commu- nities living on the infralittoral rocky bottom (An- chieta Island, Ubatuba), in order to provide infor- mation ... See full document

... for reviews). In the authors’ opinion, the confu- sion resulted, in part, because (i) there had been little detailed morphodynamic research conducted on foredune evolution and dynamics, and on fore- dune plains prior to ... See full document

... blood eluates for sera samples had a strong impact on the decline of the disease incidence. The use of an ELISA assay for the canine control would prob- ably reduce the human cases to zero. Ashford et al. (1998) ... See full document

... It was discussed above and elsewhere (Szapiro et al. 2000, 2002, Vianna et al. 2003) that the molec- ular changes underlying the beginnings of extinction are in all probability triggered by retrieval. Thus, at least in ... See full document

... 1999). An early explanation why transgenes can be ectopically expressed was that the promoters might not contain all the sequences required for their correct tissue-specific ... See full document

... have been used to stimulate ascending noradrener- gic neurons in both laboratory animals and humans, since the firing rate of LC neurons is inhibited by such receptors. The most widely used is the alka- loid yohimbine. ... See full document

... providing an analysis on lipid dynamics during insect development was conducted by Kinsella ...to an increase on the content of palmitic (16) and stearic (18) ...to an increase on the content of ... 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