[PDF] Top 20 An. Acad. Bras. Ciênc. - vol.87 número4

... THE AVERAGING THEORY OF SECOND ORDER In this section we recall the averaging theory of second order to find periodic orbits. Theorem 3[r] ... See full document

... Peacock (1999, 2002) and Whiting (2004) argued that the fact that the test galaxy joins the Hubble flow only asymptotically and on the opposite side of the observer, is contrary to what one would expect for a test body ... See full document

... in an extracellular environment- independent ...not an isolated organelle because it has developed sophisticated mechanisms of communication with many other cellular compartments, especially the ... See full document

... Ottonia martiana is a plant popularly known in Brazil by the use for toothache. Ethanolic extract (EE), hexane fraction (HF), dichloromethane fraction (DF) and piperovatine obtained from O. martiana were assayed in vitro ... See full document

... as an alternative resource for estimating climatic variables that may replace the traditional interpolation methods (Białobrzewski 2008, Sivapragasam et ... See full document

... of an adhesive tape (according to Barbosa et ...in an ethanol series, immersed in n-butyl acetate, and then mounted for permanent slides with a synthetic ... See full document

... However, Berbet and Costa (2003) also verified that even a complex, state-of-the-art, land surface scheme coupled to a climate model is unable to correctly repro- duce details of the seasonal variability of the albedo of ... See full document

... animals an paucivascular area, it allowed the division of the body in two segments anatomo-surgical, which presented the distribution of segmentary branches described in Table ... See full document

... Chemical analysis of coplanar PCBs followed the method described in a previous report: USEPA Method 1668 (2003) and USEPA Method 8290 A (2007). Five grams of liver samples were weighed and lyophilised. Dry tissues were ... See full document

... only an upper glume and lemma enveloping the caryopsis, thus, corroborating the description of the genus (Filgueiras 1986, Oliveira and Valls 2001, Boldrini et ... See full document

... Animals that have deceased from natural causes were donated by the National Center of Primates (Cenp). All procedures were carried out according to the interna- tional practices for animal use and care under the con- ... See full document

... Production of fibrous activated carbons from natural cellulose (jute, coconut) fibers for water treatment applications. Mechanical property evaluation of sisal–jute–glass fi[r] ... See full document

... in an extractive form and information about production technologies are essential for its seedling propagation and rational use, however, the seedling production is hampered due to the small number of seeds per ... See full document

... Although researches relate pathogenic tole rance to melanization’s reactions with consequent involvement of 22 prophenoloxidases cascade (Wilson et al. 2001), very little is known about the phenoloxidase activity in ... See full document

... In the first half of the past century the most studied types of fear-motivated behaviors were the phobic states, and the prevalent explanation of these states was Pierre Janet’s theory of a constitutional lowering of ... See full document

... According to Hrastinski (2008), participation is an intrinsic characteristic of teaching. The key to e-Learn- ing systems as a teaching activity and online learning is to multiply and facilitate participation ... See full document

... found at Brazilian savannas and can be also confused with H. glabra Hook & Arn., another similar but dif- ferent species used in Brazilian folk medicine as a seda- tive and anxiolytic agent (Galietta et al. 2005). ... See full document

... tion, regulation of blood sugar and cellular energy, re- production, digestion, bone growth, and it aids in de- fense mechanisms against free radicals (Aschner and Aschner 2005). Copper promotes the formation of the ... See full document

... and appropriating the consumption objects, places him- self/herself in the role of an active receiver of the social discourse inherent to the object. When using it, he/she legitimates the symbolic value that the ... See full document

... lungs, an increase in apoptotic cells has also been described, and may be associated not only with the extrinsic pathway, with enhanced expression of FasL and caspase, but also with mitochondrial pathway ... See full document