We study the one-dimensional logistic map with parametric perturbation. Using a small periodic function as the perturbation, new attractors may appear. Beside these new attractors, complex attractors exist and are responsible for transients in many trajectories. We observe that each one of these...

Like proteins, single-stranded RNA's (ssRNAs) undergo intramolecular folding into complex conformations which determine their metabolic function. We have compiled nucleotide composition data, expressed as G+A and G+U in addition to G+C content, from phylogenetically representative samples of...

The number of distinct functional classes of single-stranded RNAs (ssRNAs) and the number of sequences representing them are substantial and continue to increase. Organizing this data in an evolutionary context is essential, yet traditional comparative sequence analyses require that homologous...