The first records of Libellula pulchella and Phyllogomphoides albrighti from Coahuila are reported. These records extend the known geographic range of Libellula pulchella south of Texas and Phyllogomphoides albrighti west of Nuevo León. The specimens were collected in the Cuatro…

Two main volcanic fields separated by a volcano-tectonic structure were emplaced in the southern part of San Luis Potosí state during the Cenozoic peak of continental extension in the SE portion of the Sierra Madre Occidental. The Eocene to Quaternary…

Only 40 cases of Stenotrophomonas maltophilia (S. maltophilia) endocarditis have been reported to date, and there is no description in patients with underlying autoimmunity. A 23-year-old woman with systemic lupus erythematosus (SLE) overlapping rheumatoid arthritis (RA) and no risk factors…

Objective: The aim of this study was to test for association between MHC2TA gene polymorphisms and risk for restenosis after coronary stent placement in a group of Mexican patients. Methods: The MHC2TA-168A>G (rs3087456), 1614C>G (rs4774), and 2536G>A (rs2229320) single nucleotide…

We relate the fundamental stages of the long road leading to the discovery of electricity and its uses in cardiology. The first observations on the electromagnetic phenomena were registered in ancient texts; many Greek and Roman writers referred to them,…

The historical reconstruction of solar activity is a task of great interest for geophysicists and solar physicists. Historical sunspot observations are a fundamental tool for this task. In this short contribution, we present some historical sunspot observations in Mexico.

Four species of Lachesilla, from Mexico and Guatemala, are here described and illustrated. Together with L. asperiforceps García Aldrete, from Mexico, Guatemala and Nicaragua, they constitute the L. asperiforceps species complex, a diagnosis of which is provided, as well as…

Assuming a linear relationship between maximum length (L) and maximum fault displacement (D) we investigate the effects of displacement component measured, observation level, and fault linkage by using data from the normal faults of the Akal block of the Cantarell…

The geographic distribution of the species of Datura in Mexico was analyzed using numerical analysis of natural populations documented by herbarium specimens. A map of Mexico was divided into 239, 1° x 1° squares (latitude and longitude) which were used…

Melampodium sinuatum Brandegee, especie endémica del extremo sur del estado de Baja California Sur, México, constituye una especie poco conocida debido a su rareza y distribución restringida. No se conoce de más de 5 sitios; todos ellos amenazados por las…