Analyzing similarities in genome sequences.

This article investigates aspects of similarity between complete sequences of mitochondrial DNA by determining the distribution of the relative frequencies of words with different lengths and the characteristics of their relevance throughout the sequences. The degree of similarity is obtained by comparing the distances between words contained within these sequences. Our results indicate that the best groupings among different species depend on the lengths of words and their respective relative frequencies. We also observed that the longer the word the more consistent the grouping between the sequences becomes. The application of our results, together with the perspective of analyzing DNA sequences belonging to a single biological species, may be important for the construction of phylogenetic trees, which are appropriate structures for understanding the evolutionary history of the species.

Rotating effects on the Landau quantization for an atom with a magnetic quadrupole moment.

Based on the single particle approximation [Dmitriev et al., Phys. Rev. C 50, 2358 (1994) and C.-C. Chen, Phys. Rev. A 51, 2611 (1995)], the Landau quantization associated with an atom with a magnetic quadrupole moment is introduced, and then, rotating effects on this analogue of the Landau quantization is investigated. It is shown that rotating effects can modify the cyclotron frequency and breaks the degeneracy of the analogue of the Landau levels.

Caracterizaçäo da microbiota psicrotrófica deteriorativa em carcaças de frango sob efeito de soluçöes sanificadoras, na linha de produçäo de abatedouros industriais / Characterization of spoilage microorganisms in broiler carcasses, under effect of sanitizer solutions

Pesquisou-se a microbiota psicrotrótica deteriorativa (proteolítica e lipolítica) da carne de frango, sob efeito de tratamentos de pré-resfriamento em soluçöes de 50 e 70 ppm de cloro livre e em soluçöes de ácido acético 0,2M em pH=3,5 e 5,0, em dois abatedouros de duas regiöes produtoras do Estado de Minas Gerais. Houve predominância dos seguintes gêneros: Pseudomonas, 35,75 por cento, Acinetobacter, 21,71 por cento, Moraxella, 21,60 por cento, Achromobacter, 21,40 por cento, Alcaligenes, 15,60 por cento, Alteromonas, 13,30 por cento e Flavobacterium, 10,0 por cento, cujas freqüências foram diferentemente distribuídas para as duas regiöes estudadas