Polytechnic University of Sinaloa

Mazatlan, Mexico
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Reyes G.,Institute of Technology of La Laguna ITLag | Pamanes J.A.,Institute of Technology of La Laguna ITLag | Fierro J.E.,Institute of Technology of La Laguna ITLag | Nunez V.,Polytechnic University of Sinaloa
Mechanisms and Machine Science | Year: 2018

A method is presented in this paper to determine optimal values of the parameters for the gait of a humanoid robot. These parameters are relevant for a stable walking of the robot when this one follows a rectilinear path. By applying such optimal parameters the set of zero moment points of the support foot, corresponding to a step in the walking, is located as close as possible to the center of the footprint of the support foot. The computation of the optimal parameters is accomplished by minimization of a nonlinear objective function that describe the distance from the center of the footprint to a typical remote zero moment point (ZMP) estimated from a sample of such points generated during a step. A study case is presented to illustrate the efficacy of the proposed method. This one provide some advantages compared with other approaches in the literature. © Springer International Publishing AG 2018.

Martinez-Montano E.,Polytechnic University of Sinaloa | Uriarte I.,Austral University of Chile | Rosas C.,National Autonomous University of Mexico | Amthauer R.,Austral University of Chile | And 2 more authors.
Aquaculture Nutrition | Year: 2017

Two formulated diets were evaluated to replace live crab (C) as feed for juveniles Enteroctopus megalocyathus. Formulated diets consisted of crab paste (CP) and a mixture of freeze-dried meals of crab and squid (C&S). After 10 weeks of feeding, the effect of each diet was analysed on productive performance, nutritional and physiological condition and immune system. Both the crab and C&S diets produced the best values for specific growth rate, feed conversion ratio and protein efficiency ratio. The diet C&S proved to be the most digestible with greatest metabolized energy. The CP diet was similar to the C diet in terms of biological value and protein apparent digestibility; nevertheless, its performance was weaker for the other indicators. Furthermore, the highest α-amylase, lipase and alkaline proteolytic activity values were observed in octopuses fed live crab, as opposed to those fed formulated feeds. The type of diet did not affect lysozyme activity in neither mucus nor haemolymph. The production of reactive oxygen species was highest in octopuses fed CP diet. It is proposed the use of C&S diet to study the nutritional requirements and to develop an optimal formulated diet for juvenile Patagonian red octopus. © 2017 John Wiley & Sons Ltd.

Mejias-Brizuela N.Y.,Polytechnic University of Sinaloa | Olivares-Perez A.,National Institute of Astrophysics, Optics and Electronics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2017

High fructose corn syrup was used for preparation of holographic gratings photosensitized with potassium bichromated, for to analyze the behavior of diffraction efficiency to first order. The behavior of diffraction efficiency to first order was analyzed at time intervals different: 24, 48, 72 and 96 hours, because to the recorded gratings showed instability 24 hours after of record. For this reason, we decided to study in the time the evolution of diffraction efficiency parameter for to determine the maximum modulation of material holographic (HFCS-bichromated). The study realized showed that after of 72 hours, the photosensitized material reaches its maximum modulation, with a diffraction efficiency to first order of 4 percent. © 2017 SPIE.

Boggia J.,University of the Republic of Uruguay | Boggia J.,Hospital Of Clinicas Dr Manuel Quintela | Asayama K.,Teikyo University | Li Y.,Shanghai JiaoTong University | And 3 more authors.
Current Hypertension Reports | Year: 2014

Variability is a phenomenon attributed to most biological processes and is a particular feature of blood pressure (BP) that concerns many physicians regarding the clinical meaning and the impact on their clinical practice. In this review, we assessed the role of different indices of BP variability in cardiovascular risk stratification. We reviewed the indices of BP variability derived from ambulatory BP monitoring (day-to-night ratio, morning surge of BP, and short-term BP variability) and home BP measurement (standardized conventional BP measurement and self-BP measurement), and summarized our recent results with the intention to provide a clear message for clinical practice. Conclusion: BP variability, either derived from ambulatory BP measurement or home BP measurement does not substantially refine cardiovascular risk prediction over and beyond the BP level. Practitioners should be aware that BP level remains the main modifiable risk factor derived from BP measurement and contributes to improving the control of hypertension and adverse health outcomes. © 2014, Springer Science+Business Media New York.

Rodriguez-Tirado V.,Polytechnic University of Sinaloa | Green-Ruiz C.,National Autonomous University of Mexico | Gomez-Gil B.,Ac Mazatlan Unit For Aquaculture And Environmental Management Ap 711
Chemical Engineering Journal | Year: 2012

To determine the effects of pH, salinity and temperature on the Cu and Pb biosorption capacities of the subtropical estuarine bacteria Bacillus thioparans strain U3, batch experiments were performed under a variety of laboratory conditions. Of the eight kinetic models employed, the pseudo-second order (PSO) model provided the best fit for the experimental data for both metals. The optimal conditions for Cu biosorption were at pH 6 and 25°C, while Pb biosorption was maximised at pH 4 and 35°C. Zero salinity was optimal for both metals. The experimental data fit the Langmuir adsorption model well. The maximum Cu and Pb biosorption capacities of B. thioparans U3 suggest that the bacterium can be a suitable biosorbent for these metals. © 2011 Elsevier B.V..

PubMed | Coordinacion Of Tecnologia Of Alimentos Of Origen Animal Research Center En Alimentacion sarrollo, Polytechnic University of Sinaloa and Programa Of Investigacion En Biotecnologia Instituto Nacional Of Investigaciones Forestales
Type: | Journal: Applied biochemistry and biotechnology | Year: 2016

Plant proteases are capable of performing several functions in biological systems, and their use is attractive for biotechnological process due to their interesting catalytic properties. Bromelia pinguin (aguama) is a wild abundant natural resource in several regions of Central America and the Caribbean Islands but is underutilized. Their fruits are rich in proteases with properties that are still unknown, but they represent an attractive source of enzymes for biotechnological applications. Thus, the proteolytic activity in enzymatic crude extracts (CEs) from wild B. pinguin fruits was partially characterized. Enzymes in CEs showed high proteolytic activity at acid (pH 2.0-4.0) and neutral alkaline (pH 7.0-9.0) conditions, indicating that different types of active proteases are present. Proteolytic activity inhibition by the use of specific protease inhibitors indicated that aspartic, cysteine, and serine proteases are the main types of proteases present in CEs. Activity at pH 3.0 was stable in a broad range of temperatures (25-50C) and retained its activity in the presence of surfactants (SDS, Tween-80), reducing agents (DTT, 2-mercapoethanol), and organic solvents (methanol, ethanol, acetone, 2-propanol), which suggests that B. pinguin proteases are potential candidates for their application in brewing, detergent, and pharmaceutical industries.

Echeverria C.,University of Toronto | Echeverria C.,University of Los Andes, Venezuela | Echeverria C.,Polytechnic University of Sinaloa | Kapral R.,University of Toronto
Physical Chemistry Chemical Physics | Year: 2015

The dynamics of an elastic network model for the enzyme 4-oxalocrotonate tautomerase is studied in a system crowded by mobile macromolecules, also modeled by elastic networks. The system includes a large number of solvent molecules, as well as substrate and product molecules which undergo catalytic reactions with this hexameric protein. The time evolution of the entire system takes place through a hybrid dynamics that combines molecular dynamics for solute species and multiparticle collision dynamics for the solvent. It is shown that crowding leads to subdiffusive dynamics for the protein, in accord with many studies of diffusion in crowded environments, and increases orientational relaxation times. The enzyme reaction kinetics is also modified by crowding. The effective Michaelis constant decreases with crowding volume fraction, and this decrease is attributed to excluded volume effects, which dominate over effects due to reduced substrate diffusion that would cause the Michaelis constant to increase. This journal is © the Owner Societies.

Nunez J.V.,Polytechnic University of Sinaloa | Briseno A.,Polytechnic University of Sinaloa | Rodriguez D.A.,Polytechnic University of Sinaloa | Ibarra J.M.,CINVESTAV | Rodriguez V.M.,Polytechnic University of Sinaloa
Proceedings - 2012 Brazilian Robotics Symposium and Latin American Robotics Symposium, SBR-LARS 2012 | Year: 2012

The aim of this paper is to explain basic kinematic concepts applied to humanoid robots. The structure of a Bioloid with three degrees of freedom (DoFs) for the arms and six DoFs for the legs is considered. The solution of direct and inverse kinematics (IK) is presented for both arms and legs. Our main contribution is to solve in a detailed manner the legs IK because this is the basis for planning walking motions. © 2012 IEEE.

Zambrano-Zaragoza J.F.,Autonomous University of Nayarit | Romo-Martinez E.J.,Polytechnic University of Sinaloa | Duran-Avelar M.D.J.,Autonomous University of Nayarit | Garcia-Magallanes N.,Polytechnic University of Sinaloa | Vibanco-Perez N.,Autonomous University of Nayarit
International Journal of Inflammation | Year: 2014

The view of CD4 T-cell-mediated immunity as a balance between distinct lineages of Th1 and Th2 cells has changed dramatically. Identification of the IL-17 family of cytokines and of the fact that IL-23 mediates the expansion of IL-17-producing T cells uncovered a new subset of Th cells designated Th17 cells, which have emerged as a third independent T-cell subset that may play an essential role in protection against certain extracellular pathogens. Moreover, Th17 cells have been extensively analyzed because of their strong association with inflammatory disorders and autoimmune diseases. Also, they appear to be critical for controlling these disorders. Similar to Th1 and Th2 cells, Th17 cells require specific cytokines and transcription factors for their differentiation. Th17 cells have been characterized as one of the major pathogenic Th cell populations underlying the development of many autoimmune diseases, and they are enhanced and stabilized by IL-23. The characteristics of Th17 cells, cytokines, and their sources, as well as their role in infectious and autoimmune diseases, are discussed in this review. © 2014 José Francisco Zambrano-Zaragoza et al.

Mejias-Brizuela N.Y.,Polytechnic University of Sinaloa | Olivares-Perez A.,National Institute of Astrophysics, Optics and Electronics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016

Experimental technique is described for holographic record in two different hexoses, with a new photosensitizer, the ferric ammonium citrate, and compared to the hexoses-dichromated films. The ferric ammonium citrate is an optimal salt for photosensitization of hexoses because we obtained a diffraction efficiency to first order acceptable for saccharides materials (two and three percent), has ability for to storage information, holographic images are quite stable over time, it is hydrophobic and is cheap. The experiments showed that the films called hexose 1-citrate and hexose 1-dichromate, present the maximum diffraction efficiency at first diffraction order. © 2016 SPIE.

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