Mature mammalian neurons have a limited ability to extend neurites and make new synaptic connections, but the mechanisms that inhibit such plasticity remain poorly understood. Here, we report that OFF-type retinal bipolar cells in mice are an exception to this rule, as they form new anatomical connections within their tiled dendritic fields well after retinal maturity. The Down syndrome cell-ad...

Fil: Presser, Demian Javier. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Santa Fe. Instituto Desarrollo para la Industria Quimica. Universidad del Litoral. Quimica; Argentina

new heterothallic species of the genus Sordaria, Sordaria heterothallis ' Ze?ds and Maniotis (FIELDS and MANIOTIS, 1963) and Sordaria thermophila Fields (FIELDS 1968), are the subjects of this study. FIELDS (1963), in a comparative study of the two isolates concluded that they were distinct species on the basis of morphological and cultural studies, and from the results of hybridization experim...

Point counts and mist-net surveys were employed to study the winter distri­ bution of nearctic migratory landbirds in Mexico’s Yucatan Peninsula. Overwintering mi­ grants comprised 42 regularly occurring species, and accounted for 30-58% (mean = 41%) of the individual birds encountered in surveys of a wide range of natural and disturbed habitats. Some migratory species were encountered most fre...

We draw on the early history of the management consulting field to build theory about how institutional entrepreneurs legitimate new kinds of organizations in emerging fields. We study the professional form of management consulting organization, which came to dominate other alternatives. Pioneers of this organizational form seized opportunities arising from broad institutional change to discred...