UJAT

Jalpa de Méndez, Mexico
Jalpa de Méndez, Mexico
SEARCH FILTERS
Time filter
Source Type

Segura-Cervantes E.,Instituto Nacional Of Perinatologia Inper | Mancilla-Ramirez J.,Escuela Superior de Medicina | Zurita L.,UJAT | Paredes Y.,INPer | Galindo-Sevilla N.,Instituto Nacional Of Perinatologia Inper
Journal of Reproductive Immunology | Year: 2015

We explored the hypothesis that complement, an innate and adaptive immune effector, is active in the plasma of parturient women and is deposited on fetal membranes collected after delivery. A cross-sectional study was designed to evaluate complement activity at parturition. Pregnant women (n = 97) between 15 and 41 years of age were enrolled in a hospital protocol during the perinatal period to assess both SC5b-9 complement activity in blood and complement deposition on fetal membranes during parturition. Soluble SC5b-9 complement activity in plasma fractions was measured using a standard enzyme-linked immunosorbent assay (ELISA) that included specific anti-complement antibodies. Complement deposition on membranes was analyzed using immuno-dot blots and immunohistochemistry. Soluble SC5b-9 complement complex levels were increased in the plasma of women during term labor (TL; median 3361; range 1726-5670. ng/mL), preterm labor (PL; median 2958; range 1552-7092. ng/mL), and preterm premature rupture of membranes (PPROM; median 2272; range 167-6540. ng/mL) compared with pregnant women who were not in labor (P; median 1384; range 174-4570. ng/mL; P < 0.001, Kruskal-Wallis test). Active complement, as assessed by the C9 neo-antigen in C5b-9 complexes, was deposited on fetal membranes, with no difference between term and preterm delivery. The deposition of active complement on fetal membranes was confirmed by immunohistochemistry. Women who underwent non-labor-indicated Cesarean sections did not exhibit complement deposition. Soluble SC5b-9 complement complex levels increased in the plasma of women during parturition, and complement C5b-9 complexes were deposited on fetal membranes. © 2015 Elsevier Ireland Ltd.


PubMed | Instituto Nacional Of Perinatologia Inper, UJAT, Escuela Superior de Medicina and INPer
Type: | Journal: Journal of reproductive immunology | Year: 2015

We explored the hypothesis that complement, an innate and adaptive immune effector, is active in the plasma of parturient women and is deposited on fetal membranes collected after delivery. A cross-sectional study was designed to evaluate complement activity at parturition. Pregnant women (n = 97) between 15 and 41 years of age were enrolled in a hospital protocol during the perinatal period to assess both SC5b-9 complement activity in blood and complement deposition on fetal membranes during parturition. Soluble SC5b-9 complement activity in plasma fractions was measured using a standard enzyme-linked immunosorbent assay (ELISA) that included specific anti-complement antibodies. Complement deposition on membranes was analyzed using immuno-dot blots and immunohistochemistry. Soluble SC5b-9 complement complex levels were increased in the plasma of women during term labor (TL; median 3361; range 1726-5670 ng/mL), preterm labor (PL; median 2958; range 1552-7092 ng/mL), and preterm premature rupture of membranes (PPROM; median 2272; range 167-6540 ng/mL) compared with pregnant women who were not in labor (P; median 1384; range 174-4570 ng/mL; P < 0.001, Kruskal-Wallis test). Active complement, as assessed by the C9 neo-antigen in C5b-9 complexes, was deposited on fetal membranes, with no difference between term and preterm delivery. The deposition of active complement on fetal membranes was confirmed by immunohistochemistry. Women who underwent non-labor-indicated Cesarean sections did not exhibit complement deposition. Soluble SC5b-9 complement complex levels increased in the plasma of women during parturition, and complement C5b-9 complexes were deposited on fetal membranes.


Valenzuela L.M.,UJAT | Falconi M.,National Autonomous University of Mexico | Ble G.,UJAT
International Journal of Bifurcation and Chaos | Year: 2017

A typical approach for searching periodic orbits of planar dynamical systems is through the Hopf bifurcation. In this work we present a family of predator-prey models with a generalist predator which does not exhibit a Hopf bifurcation, but a planar zero-Hopf bifurcation; that means, in the whole bifurcation process the eigenvalues of the linear approximation around the equilibrium points remain as pure imaginary. Similar models with a nongeneralist predator always possess a Hopf bifurcation. © 2017 World Scientific Publishing Company.


Ramirez-Ortegon M.A.,UJAT | Ramirez-Ortegon M.A.,TU Braunschweig | Ramirez-Ramirez L.L.,Autonomus Institute of Technology of Mexico | Margner V.,TU Braunschweig | And 4 more authors.
Pattern Recognition | Year: 2014

In this paper, we will present a mathematical analysis of the transition proportion for the normal threshold (NorT) based on the transition method. The transition proportion is a parameter of NorT which plays an important role in the theoretical development of NorT. We will study the mathematical forms of the quadratic equation from which NorT is computed. Through this analysis, we will describe how the transition proportion affects NorT. Then, we will prove that NorT is robust to inaccurate estimations of the transition proportion. Furthermore, our analysis extends to thresholding methods that rely on Bayes rule, and it also gives the mathematical bases for potential applications of the transition proportion as a feature to estimate stroke width and detect regions of interest. In the majority of our experiments, we used a database composed of small images that were extracted from DIBCO 2009 and H-DIBCO 2010 benchmarks. However, we also report evaluations using the original (H-)DIBCO's benchmarks. © 2014 Elsevier Ltd.


Yasui G.S.,Hokkaido University | Yasui G.S.,University of Sao Paulo | Fujimoto T.,Hokkaido University | Arias-Rodriguez L.,UJAT | And 2 more authors.
Aquaculture | Year: 2012

The solutions commonly used to dilute or cryopreserve sperm are commonly composed of salts, buffers and cryoprotectants, which may affect gametes and subsequent fertilization success. Here, we have evaluated the effects of several cryoprotectants (methanol; MeOH, dimethyl sulfoxide; DMSO and dimethyl acetamide; DMA at concentrations of 0.25, 0.5 and 1%) and different ions (potassium, calcium and magnesium at concentrations of 1.25, 2.5, 5.0 and 10. mM) as sperm diluents upon sperm motility and fertilization success in the loach Misgurnus anguillicaudatus sperm. Our results demonstrated that DMSO (at 1%) decreased sperm motility while calcium and magnesium ions (from 2.5. mM) induced sperm aggregation and reduced sperm motility. Reduced fertilization rates were observed with potassium (from 1.25. mM), calcium (at 10. mM), magnesium (at 10. mM), DMA (at 1%), and DMSO (at 1%). We conclude that specific ions and cryoprotectants, and their relative concentrations caused effect upon loach gametes. These data are important to consider for the preparation of sperm diluents and activating solutions in order to manage gamete quality for artificial propagation. © 2012 Elsevier B.V..


Guzman M.A.,UJAT | Huirache-Acuna R.,Universidad Michoacana de San Nicolás de Hidalgo | Loricera C.V.,CSIC - Institute of Catalysis | Hernandez J.R.,UJAT | And 3 more authors.
Fuel | Year: 2013

P-containing SBA-16 mesoporous systems were used as supports of ternary Ni-Mo-W hydrodesulfurization (HDS) catalysts. The samples were characterized by a variety of techniques (N2 adsorption-desorption isotherms, XRD, TPR, TPD-NH3, DRS UV-vis and HRTEM). XRD profiles evidenced the formation of crystalline Mo1-xWxO3 and NiMoO4 phases on the surface of oxide catalyst precursors with high P-loadings (1.0 and 1.6 wt.%). The UV-vis DRS measurements showed a substantial decrease of energy band gap after P-loading onto the SBA-16 substrate with respect to P-free sample. The sulfided catalysts were tested in separate HDS of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) reactions performed in a batch reactor at 320 °C and H 2 pressure of 5.0 MPa. For both HDS reactions, the initial catalyst activity displayed a volcano-type curve indicating that catalyst behavior depends strongly on the phosphorous loading being all catalysts more active in the HDS of DBT then in the HDS of 4,6-DMDBT. The NiMoW/SBA-16 catalyst loaded with optimized amount of phosphorous (1.0 wt.%) showed superior initial activity than the P-free counterpart. This effect was attributed to the enhancement of active phases dispersion on the support surface, as revealed by HRTEM measurements. It was found that the formation of "onion-type" Mo(W)S2 phases on the catalyst surface was detrimental for the HDS activity. At reaction time of 5 h, the most active NiMoW/SBA-16 catalyst loaded with 1.0 wt.% of P showed similar activity in both HDS of DBT and 4,6-DMDBT reactions. It was found that HYD route of both reactions was promoted by the support modification with P and due to inhibition of coordinatively unsaturated sites (CUSs) by competitive adsorption of products (mainly H2S). © 2012 Elsevier Ltd. All rights reserved.


Yris J.C.,UJAT | Calleja H.,CENIDET | Hernandez L.,IPN | Olmos J.,UJAT
Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC | Year: 2012

Among the photovoltaic (PV) systems, the ones interconnected to the electric system have presented a greater growth in the developed countries. In order to transform the generated DC energy in AC energy ready to be delivered to a grid, the concept of AC Module is applied. However, the problem of generating quality voltage to the network from a single PV module arises. As a solution, the topology of the buck-boost converter with tapped inductor (TI) is studied. The purpose is selecting a converter appropriated for an integrated PV inverter, with high benefits without isolation, applied to residential use with connection to a single-phase grid. Its performance is evaluated by means of the electronic simulator PSpice and it is verified with a prototype. From the collected data it is appreciated that the proposed inverter increases the voltage gain and the efficiency with respect to traditional converter. © 2012 IEEE.


Alavez-Ramirez J.,UJAT | Ble G.,UJAT | Lopez-Lopez J.,UJAT | Llibre J.,Autonomous University of Barcelona
International Journal of Bifurcation and Chaos | Year: 2012

Applying the averaging theory of first, second and third order to one class generalized polynomial Liénard differential equations, we improve the known lower bounds for the maximum number of limit cycles that this class can exhibit. © 2012 World Scientific Publishing Company.


Ble G.,UJAT | Castellanos V.,UJAT | Llibre J.,Autonomous University of Barcelona | Quilantan I.,UJAT
Nonlinear Analysis: Real World Applications | Year: 2013

We study when the celebrated May-Leonard model in R3, describing the competition between three species and depending on two positive parameters a and b, is completely integrable; i.e. when a+b=2 or a=b. For these values of the parameters we shall describe its global dynamics in the compactification of the positive octant, i.e. adding its infinity. If a+b=2 and a≠1 (otherwise the dynamics is very easy) the global dynamics was partially known, and roughly speaking there are invariant topological half-cones by the flow of the system. These half-cones have a vertex at the origin of coordinates and surround the bisectrix x=y=z, and foliate the positive octant. The orbits of each half-cone are attracted to a unique periodic orbit of the half-cone, which lives on the plane x+y+z=1. If b=a≠1 then we consider two cases. First, if 01 then there are three equilibria in the boundary of the positive octant, which attract almost all the orbits of the interior of the octant, we describe completely their bassins of attractions. © 2012 Published by Elsevier Ltd.


PubMed | UJAT, Juarez Autonomous University of Tabasco, Hospital General Of Comalcalco and Hospital General Of Yajalon
Type: | Journal: Gaceta medica de Mexico | Year: 2015

The aim of this study was to assess the prevalence of anxiety and depression in groups of obese and normal-weight individuals with type 2 diabetes. Also, to analyze the severity of depression in type 2 diabetics by taking into account the body mass index in people with this condition.This study included 702 patients with type 2 diabetes, 236 with normal weight, and 231 with obesity. All participants completed a demographic questionnaire, the Hamilton Anxiety Rating Scale and the Hamilton Depression Rating Scale.In patients with obesity, 48.48% (95% CI: 41.82-55.14) were positive for anxiety and 49.78% (95% CI: 43.11-56.44) for depression. A significant correlation existed between the Hamilton Depression Rating Scale and body mass index with a correlation coefficient of 0.11 (p = 0.003). Also, a significant correlation coefficient equal to 0.107 (p = 0.005) between the Hamilton Anxiety Rating Scale and body mass index was found. In addition, when we analyzed depression scores, significant differences were encountered for gender between normal-weight and obesity groups in the range of severe (p = 0.01) and very severe (p = 0.04) cases.In view of the existing relationships observed among obesity, depression, anxiety, and gender in type 2 diabetics, we consider that a psychological intervention is necessary for an integral management of these patients.

Loading UJAT collaborators
Loading UJAT collaborators