Ion channels lie at the heart of gamete signaling. Understanding their regulation will improve our knowledge of sperm physiology, and may lead to novel contraceptive strategies. Sperm are tiny (similar to 3 mu m diameter) and, until now, direct evidence…

The preferred temperature (PT) of Poecilia sphenops (Pisces, Poeciliidae) (n = 240, 1.13 +/- 0.06 g wet weight, 3.26 +/- 0.88 cm standard length) from Presa Piedra Azul, Oaxaca, Mexico, was measured at acclimation temperature of 20 degreesC, 23 degreesC,…

While biologists have been aware of the existence of native Mexican trouts for over a century, they have received little study. The few early studies that did muchmore than mention their existence began in the 1930s and continued into the…

Protein assemblies with a high degree of repetitiveness and organization are known to induce strong immune responses. For that reason they have been postulated for the design of subunit vaccines by means of protein engineering. The enzyme lumazine synthase from…

One of the habitats occupied by Mammillaria magnimamma is a 2000-year old lava-field, in Mexico City. The great ecological interest on this lava-field and the little knowledge there is regarding cacti population ecology have compelled us to analyse the demography…

Este trabajo propone un modelo declarativo para el modelado de sistemas de gestión
de diálogo. La estrategia propuesta se basa en una división funcional del sistema de gestión en
cuatro niveles: especificación, interfaz de usuario, representación y ejecución; cada uno…

"La detección y tipificación de microorganismos acidófilos de ambientes mineros, macro o microscópicamente mediante su cultivo con medios selectivos requiere de varios días y en algunos casos su identificación llega solo a nivel de género. El método de tipificación basado…

"Las características principales de los drenajes ácidos de minas (DAM) son la alta concentración de sulfato (hasta 110 mM), metales disueltos, principalmente hierro (hasta 91 mM) y un pH entre 2-3. Para la remediación de los DAM la sulfatorreducción es…

Beginning with the premise that colonialism and the production of knowledge are intimately related, Christopher Schmidt-Nowara’s interests in this book lie in the versions of national and imperial histories elaborated by nineteenth-century Spanish and Antillean intellectuals. The production of knowledge…

OBJECTIVE: This comparison of population-based representative samples of adult smokers in Canada (n=1 751) and Mexico (n=1 081) aimed to determine whether cigarette packages with graphic warning labels in Canada had a stronger impact than the text-only warning labels in…