Time filter

Source Type

Poblado C-11 José María Morelos y Pavón, Mexico

Jiang H.,Nagaoka University of Technology | Tovar-Carrillo K.,Autonomous University Of Cd Juarez | Kobayashi T.,Nagaoka University of Technology
Ultrasonics Sonochemistry | Year: 2016

Ultrasound (US) drug release system using cellulose based hydrogel films was developed as triggered to mimosa. Here, the mimosa, a fascinating drug to cure injured skin, was employed as the loading drug in cellulose hydrogel films prepared with phase inversion method. The mimosa hydrogels were fabricated from dimethylacetamide (DMAc)/LiCl solution in the presence of mimosa, when the solution was exposed to ethanol vapor. The US triggered release of the mimosa from the hydrogel matrix was carried out under following conditions of US powers (0-30 W) and frequencies (23, 43 and 96 kHz) for different mimosa hydrogel matrix from 0.5 wt% to 2 wt% cellulose solution. To release the drug by US trigger from the matrix, the better medicine release was observed in the matrix prepared from the 0.5 wt% cellulose solution when the 43 kHz US was exposed to the aqueous solution with the hydrogel matrix. The release efficiency increased with the increase of the US power from 5 to 30 W at 43 kHz. Viscoelasticity of the hydrogel matrix showed that the hydrogel became somewhat rigid after the US exposure. FT-IR analysis of the mimosa hydrogel matrixes showed that during the US exposure, hydrogen bonds in the structure of mimosa-water and mimosa-cellulose were broken. This suggested that the enhancement of the mimosa release was caused by the US exposure. © 2016 Elsevier B.V. All rights reserved.

Azhmyakov V.,CINVESTAV | Azhmyakov V.,Max Planck Institute for Dynamics of Complex Technical Systems | Noriega Morales S.,Autonomous University Of Cd Juarez
Asian Journal of Control | Year: 2010

This paper is concerned with the proximal-based approach to linear and finite-difference approximations of constrained convex optimal control problems. We consider control systems governed by ordinary differential equations in the presence of additional terminal/state inequalities and propose a numerical method derived from the proximal point algorithm. The aim of the paper is to study the convergence properties of the obtained conceptual algorithm and to show that it can be used to compute approximate optimal controls. © 2009 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society.

Tovar-Carrillo K.L.,Nagaoka University of Technology | Tovar-Carrillo K.L.,Autonomous University Of Cd Juarez | Nakasone K.,Nagaoka University of Technology | Sugita S.,University of Guanajuato | And 2 more authors.
Materials Science and Engineering C | Year: 2014

Waste bagasse of Agave tequilana-Weber fibers treated with sodium hydroxide was used to elaborate hydrogel films. The bagasse was offered in an alternative use for the preparation of hydrogel films by phase inversion method without crosslinking and further purification of cellulose. The effect on the properties of the obtained films was studied when the chemical treatment of the agave fibers was changed. It was found that the resultant hydrogels showed increment in tensile from 40 N/mm2 to 56 N/mm2 with the increase of sodium hypochlorite concentration from 1 to 10 vol.%, respectively. With regard to biocompatibility properties of the hydrogel films, platelet adhesion, clotting time and protein adsorption were investigated. Analysis of the morphology of adherent NIH3T3 fibroblast indicated that the projected cell area, aspect ratio and long axis gradually increased with the increment of sodium hypochlorite content in the agave treatment. It was presented that the chemical treatment affects cell adhesion and morphology and lignin content remains in the brown fibers. © 2014 Elsevier B.V.

Soto-Plancarte A.,Universidad Michoacana de San Nicolas de Hidalgo | Santillan-Mendoza R.,Universidad Michoacana de San Nicolas de Hidalgo | Fernandez-Pavia S.P.,Universidad Michoacana de San Nicolas de Hidalgo | Ploetz R.C.,University of Florida | And 5 more authors.
Phytoparasitica | Year: 2015

Malformation is the most important disease of mango in Mexico. It affects floral and vegetative shoots, and reduces fruit production. Although several species of Fusarium cause the disease worldwide, F. mexicanum is most important in Mexico. To better understand epidemiology of disease in Mexico, we studied mango nurseries as a source of infected planting material. In 2011, 2012 and 2014, 20 mango nurseries in the states of Colima (1 nursery), Jalisco (1 nursery), Guerrero (6 nurseries) and Michoacan (12 nurseries) were examined for floral and vegetative symptoms of the disease. Although malformed plants were not observed in Colima, Guerrero and Jalisco, malformed mango seedlings and grafted plants were observed in 10 commercial nurseries in Michoacan in 2011 and 2012. Thirty-three isolates from a total of 197 symptomatic plants were identified as F. mexicanum, based on morphological and genetic criteria. Analyses of partial sequences of the EF-1α and β-tubulin genes and mating type indicated that isolates of F. mexicanum from mango nurseries are mostly a single clonal population, identical to F. mexicanum isolates previously described from mango orchards in Michoacan. Thus, mango nurseries in Michoacan could be a significant source of inoculum when new mango orchards are established in the state. Efforts should be made to produce and utilize pathogen-free planting material during orchard establishment. © 2015, Springer Science+Business Media Dordrecht.

Tovar-Carrillo K.L.,Nagaoka University of Technology | Tovar-Carrillo K.L.,Autonomous University Of Cd Juarez | Tagaya M.,Nagaoka University of Technology | Kobayashi T.,Nagaoka University of Technology
Industrial and Engineering Chemistry Research | Year: 2014

Biohydrogel interpenetrated films of wooden pulp cellulose and hydroxyethyl cellulose (HEC) were prepared, and their biomedical properties were investigated. Our purpose was to obtain new material combining the nontoxicity and biocompatibility in wooden pulp cellulose films by interpenetration of HEC. It was found that the increment of HEC content affects the mechanical properties of the hydrogel from 10 to 50 wt % content of HEC. In vitro biocompatibility tests showed that protein adsorption, clotting time, and platelet adhesion were affected with the increment of HEC. All of the obtained hydrogels showed better cytocompatibility than the reference on a tissue culture grade polystyrene dish. However, HEC content seemed to decrease fibroblast cell densities due to its effect on the film properties, showing different pulp aggregation. In conclusion, the cell densities on hydrogel were significantly changed depending upon the HEC interpenetration. © 2014 American Chemical Society.

Discover hidden collaborations