Deformed Gaussian Orthogonal Ensemble description of Small-World networks

The study of spectral behavior of networks has gained enthusiasm over the last few years. In particular, Random Matrix Theory (RMT) concepts have proven to be useful. In discussing transition from regular behavior to fully chaotic behavior it has been found that an extrapolation formula of the Brody type can be used. In the present paper we analyze the regular to chaotic behavior of Small World (SW) networks using an extension of the Gaussian Orthogonal Ensemble. This RMT ensemble, coined the Deformed Gaussian Orthogonal Ensemble (DGOE), supplies a natural foundation of the Brody formula. SW networks follow GOE statistics till certain range of eigenvalues correlations depending upon the strength of random connections. We show that for these regimes of SW networks where spectral correlations do not follow GOE beyond certain range, DGOE statistics models the correlations very well. The analysis performed in this paper proves the utility of the DGOE in network physics, as much as it has been useful in other physical systems.Comment: Replaced with the revised version, accepted for publication in Phys. Rev.

Avaliação nutricional de diferentes acessos de sorgo.

O objetivo deste trabalho foi verificar se o sorgo contendo tanino interfere ou nao na digestibilidade da silagem. Dez acessos (variedades, linhagem e hibridos) de sorgo, foram avaliados na Embrapa Gado de leite, quanto a alguns parametros importantes para alimentacao de ruminantes. as amostras foram coletadas na Embrapa Milho e Sorgo. Oitenta mini-silos experimentais, oito de cada material foram analisados em duplicata, apos 60 dias ensilados. Duas amostras foram secas a 55oC durante 72 h, para a determinacao de materia seca total (MST), fibra em detergente neutra (FDN), fibra em detergente acido (FDA), lignina em permanganato de potassio (LIG-P), digestibilidade in vitro (48, 24 e 4 horas), cinza e proteina bruta (PB). oram feitas analises de variancia, e o teste Scott-knott a 5% de probabilidade, para a comparacao de medias. A digestibilidade em 24 e 48 horas, nao mostrou diferencas entre tratamentos, sugerindo que esta nao foi afetada pelo teor de tanino existente na silagem. O hibrido BR701 com tanino apresentou alto teor de proteina bruta de 8,05% e a mais alta digestibilidade em 48 horas com 60,84%. A linhagem CMSXS114 (T), CMSXS165 (ST) e o hibrido BR700 (T) mostraram ser prontamente disponiveis no rumem. Isto sugere que os materiais geneticos com tais caracteristicas sejam mais indicados para vacas com alta producao. Sugere-se que esses materiais sejam analisados quanto ao consumo

Endosperm genotyping as a strategy to differentiate the allele source in maize heterozygous progeny.

The objective of this work was to distinguish the parental source of alleles in heterozygous progeny using semiquantitative polymerase chain reaction (PCR) in maize endosperm. Endosperms derived from direct and reciprocal single-cross hybrids between maize inbred lines L3 and L1113-01 were genotyped by semiquantitative PCR methodology (SQ-PCR) using fluorescent microsatellite primers. The amplification products were evaluated by the ratios of fluorescence intensity (RFI), calculated between the peaks corresponding to the alleles derived from each parental line. Based on the statistically significant contrast between RFI mean values of direct and reciprocal single-cross hybrids, it was possible to distinguish the number of alleles received from each parental line and, ultimately, to determine the origin of the alleles of each cross. Thus, endosperm genotyping using SQ-PCR is a promising strategy to map QTL in maize outbred populations

Coeficiente de parentesco entre as principais cultivares de feijão do tipo carioca.

Foi obtida a genealogia das principais cultivares de feijão tipo carioca em uso no Brasil e estimado o grau de parentesco entre elas. Foi obtida a genealogia de 15 cultivares