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We present a full-sky 100 km map that is a reprocessed composite of the COBE/DIRBE and IRAS/ ISSA maps, with the zodiacal foreground and conrmed point sources removed. Before using the ISSA maps, we remove the remaining ...

Low resolution spectra in the λλ3500-4600 Å wavelength range of 23 stars with the B[e] phenomenon are presented. Spectral classification of 15 program stars was performed using the BCD spectrophotometric system, based...

Se presentan los resultados de la categorización de la herpetofauna de la República del Paraguay, utilizando las categorías propuestas por la Unión Internacional para la Conservación de la Naturaleza (UICN). El 10,9...

A noticeable aspect of metatherian evolution in South America is the influence of climatic oscillations in their macroevolutionary patterns, involving major radiations during warming phases, and extinctions and functiona...

The inherent vulnerability of elasmobranchs (i.e., sharks, skates, rays) to extinction stems from their conservative life history traits, particularly those related to reproduction. Traditional studies on elasmobranch re...

Se intenta la reconstrucción de los perfiles demográficos para un conjunto de poblaciones asociadas con datos históricos, económicos, contextuales y dataciones concretas. Para la caracterización de la estructura de ...

Las especies amenazadas (EA) son aquellas que tienen una elevada probabilidad de extinción o que se aproximan a dicha situación de continuar las presiones directas sobre éstas o sus hábitats. Partiendo de esta defini...

El futuro de Estonia, Letonia y Lituania está determinado por factores geopolíticos fundamentales, pasados y presentes, por la actitud general de Occidente, y también por las decisiones políticas, económicas y milit...

Los mamíferos del Pleistoceno superior de la provincia de Entre Ríos constituyen la paleomastofauna más diversa, abundante y estratigráficamente acotada del Cuaternario de la Mesopotamia argentina. Se reconocen 33 es...

El presente trabajo de Tesis Doctoral tiene como objetivo el análisis anatómico de restos inéditos de serpientes del Cretácico y Paleógeno de Argentina, así como la revisión actualizada de la distribución espacia...

The present study includes a review of the geographic and stratigraphic distribution of short-faced bears (Ursidae, Tremarctinae) in South America. In addition, the authors discuss biogeographic hypotheses regarding the ...

Context. We present the second Gaia data release, Gaia DR2, consisting of astrometry, photometry, radial velocities, and information on astrophysical parameters and variability, for sources brighter than magnitude 21. In...

Leon Festinger's theory of cognitive dissonance has been widely recognized for its important and influential concepts in areas of motivation and social psychology. The theory of dissonance is here applied to the problem ...

Human alteration of Earth is substantial and growing. Between one-third and one-half of the land surface has been transformed by human action; the carbon dioxide concentration in the atmosphere has increased by nearly 30...

We present spectral and photometric observations of 10 Type Ia supernovae (SNe Ia) in the redshift range 0.16 z 0.62. The luminosity distances of these objects are determined by methods that employ relations between SN I...

Biogeography was stuck in a "natural history phase" dominated by the collection of data, the young Princeton biologists Robert H. MacArthur and Edward O. Wilson argued in 1967. In this book, the authors developed a gener...