Acanthocereus chiapensis Bravo was described from plants collected in Chiapas, Mexico in March 1967. Field observations as well as detailed morphological and anatomical studies revealed that this entity rather belongs to genus Peniocereus. This taxonomic opinion was supported by the…

Background. Causes of FUO change according to medical innovations, modifications of social circumstances, and emerging health risks. Aim. To describe the epidemiology of classical FUO, the time and procedures to achieve a definitive diagnosis, and to underline the variables useful…

A complete description of Vallecillichthys multivertebratum Blanco and Cavin, 2003, is provided. This ichthyodectiform fish was collected in the Vallecillo Member of the Agua Nueva Formation (Upper Cretaceous: lower Turonian) at Vallecillo, Nuevo León State, northeastern Mexico. On the basis…

A lungworm of the genus Rhabdias (Nematoda: Rhabdiasidae) was recovered from Scinax staufferi (Anura: Hylidae) collected in Guadalupe Victoria Mapastepec, Chiapas, Mexico (15°28'28"N, 92°53'26"W, 102 m). Morphology of the nematode is briefly described and compared with other species of the…

The purpose of this article is to examine the institutionalization of a region of the United States of America: the Texas Lower Rio Grande Valley. It will use and build on theories of regional institutionalization, geography, and demography by Paasi,…

OBJECTIVE: In the last decade, important advances were made in the struggle for reproductive rights in Mexico. The goal of this study was to discover the opinions of decision-makers about the grounds for legal abortion as well as to explore…

OBJECTIVE: In this work we report the molecular characterization of beta-lactam antibiotics resistance conferred by genes contained in plasmids from enterobacteria producing extended-spectrum beta-lactamases (ESBL). MATERIAL AND METHODS: Fourteen enterobacterial clinical isolates selected from a group of strains obtained from…

Small aquatic systems (<100 ha) in Mexico are commonly regulated by the climate. The climate generates a temporal unit of variation throughout the year along a latitudinal gradient, that is strongly modified by the altitude. The proposed grouping of small…

Crinoid columnals and pluricolumnals assigned to five species, Pentaridica (col.) rothi Moore and Jeffords, Cyclocaudex cf. C. (col.) jucundus Moore and Jeffords, Cyclocaudex cf. C. (col.) costatus Moore and Jeffords, Preptopremnum (col.) rugosum Moore and Jeffords, and Heterostelechus (col.) texanus…

The fossil-rich deposits of Térapa (east-central Sonora) contain more than 60 zoological taxa, many with tropical affinities such as Crocodylus (crocodylian), Hydrochaeris (capybara), and many birds. The deposits also contain the dermal ossicles (osteoderms) of two extinct xenarthrans, a glyptodont…