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…

La evolución de las características ecológicas de las especies es uno de los temas más intensamente estudiados, pero su complejidad suele limitar estos estudios a evidencias indirectas de las adaptaciones reales de los organismos. Recientemente, métodos moleculares como los "micro-arrays"…

While birdsong is a model system for animal communication studies, our knowledge is derived primarily from the study of only one sex and is therefore incomplete. The study of song in a role-reversed species would provide a unique opportunity to…

For the first time for Mexican mycobiota the genus Cerinomyces Mar. is reported with the species C lagerheimii (Pat.) McNabb. This species only have been found in Ecuador (type locality), Brasil, United States and Venezuela. A review of different specimens…

In 1950, Tinbergen described the elicitation of offspring begging by the red spot on the bill of parent gulls, and this became a model system for behavioural studies. Current knowledge on colour traits suggests they can act as sexual signals…

Studies of tropical secondary forest succession face strong limitations due to the slow pace of succession and the time-consuming task of monitoring processes. The occurrence of tree rings in secondary forest trees may help expand our knowledge on succession in…

The region of Huatusco, in Veracruz, Mexico, is an area of high coffee production. Coffee trees are sensitive to temperature and precipitation variations. Those climatic elements are related to the altitude, aspect and slope it? the agroecological shadow system. A…

Volcan de Colima has increased its activity considerably since 1998 with four periods of effusion and since 2003, daily Vulcanian explosions. During 2005 the magnitude of the explosivity increased, producing many pyroclastic flows, two of which reached over 5 km…

This thesis studies al-Ghazali's theory of knowledge, particularly his concept of knowledge of God in his three later works: "The book of Knowledge" of the Ih&dotbelow;ya', al-Munqidh, and Iljam al-`Awamm. From his conception of knowledge of God the first book…

The contemporary study in the philosophy of language concentrates extensively on a cluster of questions defining the problem of linguistic knowledge (Evans 1981, Davies 1989, Dummett 1991). What explains a speaker's language mastery? Is it knowledge that underwrites our linguistic…