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The aquifer flowing beneath the Yucatan Peninsula, Mexico, is one of the largest in the world and is in direct contact with the surface through "cenotes" (sinkholes) that have been documented to be contaminated with various classes of pollutants. The objective of this study was to evaluate the environmental status of the Great Mayan Aquifer through a review of data published on pollution of the cenotes. Approximately 1000 known georeferenced cenotes on the Yucatan Peninsula were geographically located. A map was generated using the geographic information system software. High-resolution satellite images were processed to complement the "QuickMap Services" and the formatting service of the Environmental Systems Research Institute. From the literature, 173 cenotes were identified as being sampled for various pollutants, and of these, one or more classes of pollutants were detected in 160 (i.e., greater than 92%) of the cenotes. Pollutants reported to be present included bacteria and viruses of human origin, fecal sterols, polycyclic aromatic hydrocarbons (PAHs), pesticides, pharmaceuticals, illicit drugs and personal care products. From the review of the literature, only 13 cenotes were reported to be free of the target pollutants. From this study, it can be concluded that the aquifer system with the Yucatan Peninsula is vulnerable to contamination from pollutants originating from wastewater, as well as surface runoff and infiltration from urban and agricultural lands.

Se estudió la composición de la dieta de la codorniz Moctezuma Cyrtonyx montezumae en municipios del noroeste del Estado de México. Se obtuvieron nueve buches de la temporada de cacería invierno 2001-2002. El análisis macrohistológico mostró que el principal componente de la dieta fue el bulbo de Oxalis spp. (41.99% de la materia seca), seguido por grano de trigo (40.97%), semillas de Chenopodium sp. (16.46%), semillas de avena (0.54%) e insectos (0.015%). La concentración estimada de nutrientes fue del 15.3% de proteína cruda, 0.19% Ca, 0.32% P y 3.169 kcal de energía metabolizable/ g de materia seca. Los resultados muestran que el bulbo de Oxalis y el grano de trigo constituyen los principales alimentos energéticos en el invierno.

Tuberculosis (TB) is one of the oldest human diseases that still affects large population groups. According to the World Health Organization (WHO), there were approximately 9.4 million new cases worldwide in the year 2010. In Mexico, there were 18,848 new cases of TB of all clinical variants in 2010. The identification of clusters in space-time is of great interest in epidemiological studies. The objective of this research was to identify the spatial and temporal distribution of TB during the period 2006–2010 in the State of Mexico, using geographic information system (GIS) and SCAN statistics program. Nine significant clusters () were identified using spatial and space-time analysis. The conclusion is that TB in the State of Mexico is not randomly distributed but is concentrated in areas close to Mexico City.

Se estudió la composición de la dieta de la codorniz Moctezuma Cyrtonyx montezumae en municipios del noroeste del Estado de México. Se obtuvieron nueve buches de la temporada de cacería invierno 2001-2002. El análisis macrohistológico mostró que el principal componente de la dieta fue el bulbo de Oxalis spp. (41.99% de la materia seca), seguido por grano de trigo (40.97%), semillas de Chenopodium sp. (16.46%), semillas de avena (0.54%) e insectos (0.015%). La concentración estimada de nutrientes fue del 15.3% de proteína cruda, 0.19% Ca, 0.32% P y 3.169 kcal de energía metabolizable/ g de materia seca. Los resultados muestran que el bulbo de Oxalis y el grano de trigo constituyen los principales alimentos energéticos en el invierno.