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We revisit the problem of monotonicity of the period function for the differential equation u'' - u + u(p) = 0 and give a simple proof of recent results of Miyamoto and Yagasaki. (C) 2016 Elsevier Ltd. All rights reserved. Keywords Author Keywords:Per

Este artículo presenta, a partir de la consideración de los datos de precipitaciones mensuales y anuales, un análisis de la integración de la circulación amazónica y altiplánica que vincula al centro del continente sudamericano con los Andes centrales. Bajo ciertas circunstancias atmosféricas, ma...

The 21 April 2007 Aysén earthquake triggered hundreds of landslides in the epicentral area, including several large-volume rock avalanches that caused tsunamis in the Aysén fjord. This study is part of a larger project aiming to better understand the conditioning factors controlling size and dist...

The present work identifies and quantifies the morphological alterations of scallop Argopecten purpuratus spermatozoa caused by long-term cryopreservation. Percentages of motility, fertilization and injured spermatozoa were quantified by optic microscopy and scanned electron microscopy. These par...