Santiago Miahuatlan, Mexico
Santiago Miahuatlan, Mexico

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Alavez-Ramirez R.,Grupo Mexico | Alavez-Ramirez R.,Technological Institute of Oaxaca | Montes-Garcia P.,Grupo Mexico | Martinez-Reyes J.,ESFM IPN Escuela Superior de Fisica y Matematicas | And 3 more authors.
Construction and Building Materials | Year: 2012

This study analyzes the use of lime and sugar cane bagasse ash (SCBA) as chemical stabilizers in compacted soil blocks. The blocks were tested for flexure and compression in a dry and a saturated state. The tests were performed at 7, 14 and 28 days of age in order to evaluate the effects of the addition of lime and SCBA on the mechanical properties of the compacted soil blocks. The results indicate that blocks manufactured with 10% of lime in combination with 10% of SCBA showed better performance than those containing only lime. Nevertheless, the addition of lime improved the strength of the blocks when compared with blocks fabricated with plain soil. According to SEM and DRX analyses, considerable improvement of the matrix was observed due to the formation of strong phases, such as CSH and CAH for the mixtures with additives. It was also concluded that the combination of SCBA and lime as a replacement for cement in the stabilization of compacted soil blocks seems to be a promising alternative when considering issues of energy consumption and pollution. © 2012 Elsevier Ltd. All rights reserved.


Martinez-Pelaez R.,University of the South Sierra | Rico-Novella F.,Polytechnic University of Catalonia | Velarde-Alvarado P.,Autonomous University of Nayarit
Revista Facultad de Ingenieria | Year: 2013

Recently, Chen-Hsiang-Shih proposed a new dynamic ID-based remote user authentication scheme. The authors claimed that their scheme was more secure than previous works. However, this paper demonstrates that their scheme is still unsecured against different kinds of attacks. In order to enhance the security of the scheme proposed by Chen-Hsiang-Shih, a new scheme is proposed. The scheme achieves the following security goals: without verification table, each user chooses and changes the password freely, each user keeps the password secret, mutual authentication, the scheme establishes a session key after successful authentication, and the scheme maintains the user's anonymity. Security analysis and comparison demonstrate that the proposed scheme is more secure than Das-Saxena-Gulati's scheme, Wang et al.'s scheme and Chen-Hsiang-Shih.


Garcia-Garcia L.M.,University of the South Sierra | Ramon Gil-Garcia J.,University at Albany | Gomez V.,University of the South Sierra
ACM International Conference Proceeding Series | Year: 2015

The purpose of this poster is to present the current state of this study. The objective is to know whether the Mexican National Migration Institute web portal provides the results users expect; in particular to obtain the entry permission to foreign workers, and if the process is easier, cheaper, and faster now with the implementation of information technolo-gies than it was before. This is particularly interesting, since the main users of these processes are not citizens, but na-tional from Central American countries. The question that leads this research project is the following, which are the or-ganizational and institutional variables that have inuenced the technological characteristics of INM's web portal and how those characteristics produced benefits and respond to the user's expectations? Are the inuences similar to the ones present in citizen-oriented applications and systems? To reach this goal a mixed methodology is applied with three different techniques: interviews of cofiee growers and Guatemalan workers, an assessment of the technical features of the web portal and an analysis of the oficial documents of National Migration Institute.


Jaramillo-Nunez A.,National Institute of Astrophysics, Optics and Electronics | Perez-Meza M.,University of the South Sierra
AIP Conference Proceedings | Year: 2012

Some authors mention that it is not possible to detect early bone metastasis on plain radiography. In this work we use digital imaging processing to analyze three radiographs taken from a patient with bone metastasis discomfort on the right shoulder. The time period among the first and second radiography was approximately one month and between the first and the third one year. This procedure is a first approach in order to know if in this particular case it was possible to detect an early bone metastasis. The obtained results suggest that by carrying out a digital processing is possible to detect the metastasis since the radiography contains the information although visually it is not possible to observe it. © 2012 American Institute of Physics.


PubMed | CONICET, National Autonomous University of Mexico and University of the South Sierra
Type: Journal Article | Journal: Parasitology international | Year: 2016

Pseudocorynosoma tepehuanesi n. sp., is described from the intestine of the ruddy duck Oxyura jamaicensis Gmelin, 1789 from single locality from northern Mexico. The new species is mainly distinguished morphologically from the other five described species of Pseudocorynosoma from the Americas (P. constrictum, type species, P. peposacae, P. anatarium, P. enrietti and P. iheringi) associated with waterfowl species by possessing a proboscis with 15 longitudinal rows with 7-8 hooks each, a trunk expanded anteriorly and by having smaller lemniscus. Partial sequences of the mitochondrial gene cytochrome c oxidase subunit I (cox 1) and the large subunit (LSU) of ribosomal DNA including the domains D2+D3 were used independently to corroborate the morphological distinction between the new species and other two congeneric species (P. constrictum and P. anatarium) from North America. The genetic divergence estimated among the new species and the other two species ranged from 15 to 18% for cox 1 and from 3.2 to 4% for LSU. The cox 1 alignment shows 24 sequences from P. anatarium with abnormalities, which were defined as pseudogenes due the presence of insertions, deletions and premature stop codons. Maximum likelihood and Bayesian inference analyses with each data set showed that the acanthocephalans from ruddy duck represent an independent clade with strong bootstrap support and posterior probabilities. The phylogenetic tree inferred with cox 1 gene placed all the pseudogenes from P. anatarium in single clade suggesting that those genes arose after speciation process within genus Pseudocorynosoma. The morphological evidence, plus the monophyly in both phylogenetic analyses indicate that the acanthocephalans collected from intestine of the ruddy duck from northern Mexico represent a new species.


Garcia-Garcia L.M.,University of the South Sierra
ACM International Conference Proceeding Series | Year: 2016

The objective of this research is to analyze two important aspects: first is the centrality of the user in e-Government projects and the second is e-government processes associated with migration. Regarding the former, studies of e-government have not addressed in depth the centrality of the citizen. They have partially studied some way, either from the supply side or the demand side, so this study aims to analyze the three elements: organizational process, web portal, and necessities and capabilities from the perspective of the citizen. Furthermore, this study aims to address migration issues, in particular the modernization of National Institute of Migration at the Mexico's southern border, in Tapachula Chiapas the border with Guatemala, specifically with those migrants who came to Mexico for labor objectives. Copyright is held by the owner/author(s).


Type 2 diabetes mellitus is a complex disease and a global health problem. Therefore, the first level of health care should handle the approaches of medical genetics and genomics to reduce its incidence. The aim is to present perspectives analyzed by our group in two areas of genetics and its clinical application. Emphasis is placed on the coexistence of several genetic forms clinically detectable in patients with diabetes, missing heritability associated with low penetrance, and epigenomics mechanism. It is discussed the effect of genetic variation associated with resistance to insulin, beta-cell dysfunction, shaft incretin, and other points of interest, such as thrifty genotype hypothesis, conformational disease, genetically unknown foods, phenocopies as clinically silent hypercortisolism, molecular phytopharmacology in the clinical management. Finally, the result was displayed in the Mexican population from genetic studies and new findings of clinical importance, such as involvement of melatonin and effect of variations in the number of copies in a genomic region.


Villa-Ruano N.,University of the South Sierra | Lozoya-Gloria E.,CINVESTAV
Boletin Latinoamericano y del Caribe de Plantas Medicinales y Aromaticas | Year: 2014

Species from the Montanoa genus have been used for hundreds of years in Mexican traditional medicine. The Náhuatl name given by Aztecs to this plant was “cihuapahtli”, meaning “woman’s medicine” (cihua, woman; pahtli, medicine), because M. tomentosa has been used to treat female health disorders since pre-Hispanic times due to its uterotonic properties. Later on, the Spanish pronunciation transformed the word into “zoapatle”, the name still used by herb sellers in México. Despite its use in folk medicine, intensive scientific research on this plant did not begin until the early 1970’s. The only two available reviews exclusively focused on the Montanoa species cover the period from 1529 to 1985. However, in the last two decades, important phytochemical, biochemical and biotechnological advances were achieved. This is a review of the history, botany, most relevant chemistry, biological activity and biotechnology of the secondary metabolites from the Montanoa genus so far. © 2014.


De Jesus Mijangos Martinez T.,University of the South Sierra
CEUR Workshop Proceedings | Year: 2011

Universal Grammar assumes that all human languages share a common structure with respect to their linguistic well-formedness conditions. In the linguistic theory called Optimality Theory (OT), this structure is represented by a set of linguistic candidate forms, a set of constraints and the definition of being optimal. From a nativist approach of OT is assumed that such structure is encoded in a Language Acquisition Device (LAD) that is provided to the learner of a language genetically. While OT is in a symbolic level, the LAD is in a biological one. These two levels have already been complemented with a connectionist intermediate level. In this paper our aim is to propose a complementary connection between the symbolic and the connectionist levels using penalty logic. We propose a translation from connectionism to logic expressed in the penalty knowledge base cv. This last translation try to simplify the encoding of the common structure it suggested by CVnet.


PubMed | University of the South Sierra and University of Guadalajara
Type: Journal Article | Journal: Revista panamericana de salud publica = Pan American journal of public health | Year: 2017

Estimate whether there is an association between the (CAG)n repeat in the ATXN2 gene in the Mexican population and type 2 diabetes mellitus (DM).Epidemiological case-control study, including healthy people and diabetics. (CAG)n expansion was detected by end-point polymerase chain reaction (PCR). PCR outputs were analyzed by electrophoresis (PAGE 8%) and silver nitrate staining.(CAG)n nucleotide allele distribution in the study population was similar to that reported in central Mexico. The 22-repeat allele is the most frequent; however, there is an association with carriers of long repeats in the normal range with diabetes.The results suggest that the (CAG)n repeat of the ATXN2 gene could be a causal factor for type 2 DM.

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