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  1. No Access

    Article

    Effects of agents' mobility on opinion spreading in Sznajd model

    Under synchronous updating and allowing the agents to move in the lattice or underlying network, we find that the Sznajd model always reaches a consensus as a steady state, – because agent frustrations are ...

    A. O. Sousa, T. Yu-Song, M. Ausloos in The European Physical Journal B (2008)

  2. No Access

    Article

    Monte Carlo simulations of parapatric speciation

    Parapatric speciation is studied using an individual-based model with sexual reproduction. We combine the theory of mutation accumulation for biological ageing with an environmental selection pressure that v...

    V. Schwämmle, A. O. Sousa, S. M. de Oliveira in The European Physical Journal B - Condense… (2006)

  3. No Access

    Article

    Renormalizing Sznajd model on complex networks taking into account the effects of growth mechanisms

    We present a renormalization approach to solve the Sznajd opinion formation model on complex networks. For the case of two opinions, we present an expression of the probability of reaching consensus for a g...

    M. C. González, A. O. Sousa, H. J. Herrmann in The European Physical Journal B - Condense… (2006)

  4. No Access

    Article

    Sympatric speciation in an age-structured population living on a lattice

    A square lattice is introduced into the Penna model for biological aging in order to study the evolution of diploid sexual populations under certain conditions when one single locus in the individual’s genome ...

    A. O. Sousa in The European Physical Journal B - Condensed Matter and Complex Systems (2004)

  5. No Access

    Article

    Sex and recombination in the Hötzel aging model

    Why sex evolved and it prevails in nature remains one of the great puzzles of evolution. Most biologists would explain that it promotes genetic variability, however this explanation suffers from several diffic...

    A. O. Sousa in Theory in Biosciences (2003)

  6. No Access

    Article

    Metabolic changes in the nucleus of the optic tract after monocular enucleation as revealed by cytochrome oxidase histochemistry

    The histochemistry for the mitochondrial enzyme cytochrome oxidase (CO) was used to evaluate the levels of metabolic activity in neurons of the nucleus of the optic tract (NOT) and dorsal terminal nucleus (DTN...

    C. D. Vargas, A. O. Sousa, C. M. Santos, A. Pereira Jr.… in Journal of Neurocytology (2001)

  7. No Access

    Article

    High reproduction rate versus sexual fidelity

    We introduce fidelity into the bit-string Penna model for biological ageing and study the advantage of this fidelity when it produces a higher survival probability of the offspring due to paternal care. We att...

    A.O. Sousa, S. Moss de Oliveira in The European Physical Journal B - Condense… (1999)

  8. No Access

    Article

    The Penna model for biological ageing on a lattice: spatial consequences of child-care

    We introduce a square lattice into the Penna bit-string model for biological ageing and study the evolution of the spatial distribution of the population considering different strategies of child-care. Two of ...

    A.O. Sousa, S. Moss de Oliveira in The European Physical Journal B - Condense… (1999)