The past five years have seen the arrival and extremely rapid expansion of West Nile virus (WNV) in the Western Hemisphere. The rapid sweep across North America has permitted little time for developing knowledge of the virus's potential impacts on…

and (ii) the derived state of the breeding (rather than winter) ecological niches of each species., The evolution of migration has long been considered complex and recent work has demonstrated additional complexity: some species follow the same ecological conditions throughout…

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,…

Seroepidemiological studies have demonstrated that the presence of the tapeworm carrier in the household or in the close environment is the main risk factor associated to human and swine cysticercosis. Intervention measures evaluated are: 1) Mass treatment against the adult…

Research on cysticercosis has gained much interest in many countries, epidemiology, especially, has been thoroughly studied in Latin American. The review of the information gathered from these studies allows suggesting that the knowledge of the epidemiology of cysticercosis may be…

Human neurocysticercosis is a disease caused by the ingestion of Taenia solium eggs, which are released in faeces within the final segments or proglottids of the parasite. Since sewage has been used to irrigate vegetables, it was considered for a…

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…