An efficient algorithm leading to the Fries canonical structure is presented for benzenoid hydrocarbons. This is a purely topological approach, which is based on adjacency matrices and the Hadamard procedure of matrix multiplication. The idea is presented for naphthalene, as an example. The Fries canonical-structures are also derived for anthracene, coronene, triphenylene, phenanthrene, benz[a]...

To deal with reactive sequential decision tasks, we present a learning model Clar-ion, which is a hybrid connectionist model consisting of both localist and distributed representations, based on the two-level approach proposed in Sun (1995). The model learns and utilizes procedural and declarative knowledge, tapping into the synergy of the two types of processes. It uniies neural, reinforcement...

The degree of -electron (de)localization and aromaticity of a series of polybenzenoid hydrocarbons (PBHs) has been analyzed through the π-contribution to the electron localization function (ELFπ), calculated at the B3LYP/6-311G(d,p) hybrid density functional theory level. The extent of -electron delocalization in the various hexagons of a PBH was determined through analysis of the bifurcation...

El término ‘utopía’ ha sido empleado por diversas corrientes e instituciones, entre ellas, la vida religiosa, para dar cuenta de ideas que movilizan sus proyectos mundo. La pesquisa humanista y teológica en el continente latinoamericano no abordado se manera suficiente relación utopía religiosa. Esta investigación busca determinar una textual contextual del uso (presencia ausencia) las publicac...

In Streptomyces coelicolor, bldG encodes a putative anti-anti-sigma factor that regulates both aerial hypha formation and antibiotic production, and a downstream transcriptionally linked open reading frame (orf3) encodes a putative anti-sigma factor protein. A cloned DNA fragment from Streptomyces clavuligerus contained an open reading frame that encoded a protein showing 92% identity to the S....