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Campeche, Mexico

The Autonomous University of Campeche is a Mexican public university based in the city of Campeche, Campeche, but with several campuses across the state. It was originally founded in 1965 as the Universidad del Sudeste .Its library holds over 18,000 volumes. Wikipedia.

Vidal-Martinez V.M.,CINVESTAV | Pech D.,CINVESTAV | Pech D.,Autonomous University of Campeche | Sures B.,University of Duisburg - Essen | And 2 more authors.
Trends in Parasitology

This review assesses the usefulness of parasites as bioindicators of environmental impact. Relevant studies published in the past decade were compiled; factorial meta-analysis demonstrated significant effects and interactions between parasite levels and the presence and concentration of various pollutants and/or environmental stressors. These effects and interactions were also evident in subsets of studies that used different methods such as field surveys or experimental exposure. From this meta-analysis we conclude that parasites are useful bioindicators of environmental impact. Further, by examining aspects of study design, we put forward recommendations for the design of future studies to evaluate anthropogenic impact on host-parasite interactions and increase the efficiency of environmental monitoring programs. © 2009 Elsevier Ltd. Source

Santana-Pineros A.M.,National Polytechnic Institute of Mexico | Pech D.,Autonomous University of Campeche | Vidal-Martinez V.M.,National Polytechnic Institute of Mexico
International Journal for Parasitology

The goals of this paper were to determine whether the helminth communities of the blackcheek tonguefish, Symphurus plagiusa, exhibit a spatial structure and, if so, to determine the relative influence of selected environmental and spatial variables. The parasite communities of tonguefish and environmental data (e.g., temperature, salinity, oxygen) were sampled monthly over a network of 37 stations over 1. year (February 2006 to January 2007). Analysis of similarities (ANOSIM), non-metric multidimensional scaling (NMDS) and redundancy analysis (RDA) were used. Spatial variables were generated using the analysis of principal coordinates of neighbour matrices (PCNM) method. A total of 1,010 flatfishes and nine helminth taxa were collected. For the environmental variables, hierarchical cluster analyses produced groups of stations associated with the Yucatan dry, rainy and winter seasons. At the infracommunity level, there was no group formation as indicated by ANOSIM and NMDS nor association with environmental or spatial variables. At the component community level, there was significant group formation, and RDA analyses of core, satellite and all species produced significant associations with environmental variables. However, model fit improved substantially (from 17-52% to 49-83% of explained variance) when the spatial variables (variables generated with PCNM method) were added. Thus, the helminth component communities of S. plagiusa were affected by associated environmental variables and unknown ecological processes captured by the spatial variables acting at different spatial scales over time. In contrast, at the infracommunity level there was apparently a very fine spatial grain, where the numerical dominance of core species resulted in biased group formation. © 2012 Australian Society for Parasitology Inc. Source

Tapia A.,Autonomous University of Yucatan | Acosta C.,Autonomous University of Yucatan | Medina-Esquivel R.A.,Autonomous University of Yucatan | Canto G.,Autonomous University of Campeche
Computational Materials Science

The influence of potassium (K) on the hydrogen (H) adsorption on graphene (G) was studied by means of density functional theory with the generalized gradient approximation. The structural parameters, bonding and magnetic properties of one and two H atoms interacting with potassium doped graphene (H-K/G and 2H-K/G) are calculated for different energetically stable configurations. We found a charge transfer from K atom towards G even when the H atom pairs are adsorbed. This behavior is obtained for all the configurations studied here. The binding energy per H atom is greater in the most stable 2H-K/G arrangement than in both H-K/G and H/G systems. The present results suggest that the hydrogen atom binding energy on graphene layer could increase up to 82% due to the pre-adsorption of potassium. © 2011 Elsevier B.V. All rights reserved. Source

Blum-Dominguez S.,Autonomous University of Campeche
Revista médica del Instituto Mexicano del Seguro Social

Trypanosoma cruzi was isolated from a 20 year old male with no evidence of antibodies against this parasite until 12 months after the isolation and with no electrocardiographic alterations. The isolated sample obtained was characterized as T. cruzi I through PCR mini-exon. It had been reported without serologic reactivity to T. cruzi. It is the first case with lack reactivity reported in Mexico. Source

Velazquez M.A.,Autonomous University of Campeche
Animal Reproduction Science

Since the 1990s nutritional supplements including protein, fatty acids, vitamins, and minerals have been used to try and improve the superovulatory response of embryo donors in cattle. However, the accumulated information indicates that nutritional supplementation with protein, fatty acids, or minerals does not increase the number of viable embryos from superovulated cattle. Most of the evidence has shown that vitamin supplementation may increase the mean production of transferable embryos, but only in cows, as a detrimental effect on embryo viability has been reported in young heifers. Nevertheless, vitamin supplementation seems to be effective only when compared with control cows displaying a poor mean embryo production (i.e. less than four viable embryos), questioning the economical significance of such approach. Detrimental effects on embryo development have been reported in superovulated cattle supplemented with protein or fatty acids as well. New approaches to investigate the role of nutritional supplementation on superovulatory outcome in cattle are suggested in the present review. Overall, the available evidence indicates that nutritional supplementation strategies tested are not an effective approach to enhance the superovulatory outcome of well-fed cattle donors. © 2011 Elsevier B.V. Source

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