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San Luis Potosí, Mexico

Lopez-Salinas F.I.,UASLP | Lopez-Salinas F.I.,CIMAV | Martinez-Castanon G.A.,Maestria en Ciencias Odontologicas
Materials Letters

In the last years, synthesis and characterization of bismuth compounds have received a great attention due to their potential applications. In this work, nanostructured powders of Bi2O3, BiOCl and Bi were prepared by a simple aqueous precipitation method using elemental bismuth as starting material and varying some experimental conditions. The samples obtained were characterized using X-ray diffraction (XRD) and transmission electronic microscopy (TEM); fluorescence, infrared and UV-vis absorption spectroscopies were also used. The obtained powders present a particle size under 100 nm, irregular morphology and agglomeration. A quantum confinement effect can be observed in the optical properties of the samples prepared in this work making them an interesting option for industrial applications. © 2010 Elsevier B.V. All rights reserved. Source

Salmeron-Quiroz B.B.,UASLP | Guerrero Castellanos J.F.,BUAP | Rodriguez Paredes S.A.,SEPI ESIME IPN | Villegas Medina G.,SEPI ESIME IPN
Proceedings of the 2012 7th IEEE Conference on Industrial Electronics and Applications, ICIEA 2012

Generally, the attitude estimation and the measurement of the angular velocity are a requirement for the attitude control. As a result, the computational cost and the complexity of the control loop are relatively high. In the present paper, a technique for attitude stabilization is proposed; the technique proposed is designed with attitude estimation and the prediction of the movement. With this approach, only the measurements of at least two non-collinear directional sensors are needed. Since the control laws are highly simple and a model-based observer for angular velocity reconstruction is not needed, the proposed new strategy is very suitable for embedded implementations. The global convergence of the estimation and prediction techniques is proved. Simulations with some robustness tests are performed. © 2012 IEEE. Source

Nava-Munoz S.,UABC | Moran A.L.,UABC | Meza-Kubo V.,UASLP
Smart Innovation, Systems and Technologies

Taking care of an elder with cognitive impairment is not an easy task. The caregiver needs to be aware of what surrounds the elder at all times to be able to prevent, avoid or manage any event that may affect the elder's quality of life. Based on an observational study to improve our understanding regarding the care practices of a nursing home, we proposed a system for context-aware notifications, aiming at increasing caregivers' awareness about elders' situations of care. The main feature of the system architecture is that it considers both the Situation of Care of Elders and the Situation of Caregivers to setup notifications. The results of an initial evaluation in a nursing home are promising. During the evaluation period, caregivers perceived an increase in their awareness of the situations of care and a safer working environment regarding the provided quality of care. © Springer-Verlag Berlin Heidelberg 2010. Source

Garoby-Salom S.,French Institute of Health and Medical Research | Garoby-Salom S.,Toulouse 1 University Capitole | Gueraud F.,National Polytechnic Institute of Toulouse | Camare C.,French Institute of Health and Medical Research | And 8 more authors.
Journal of Physiology and Biochemistry

Dietary intake of Opuntia species may prevent the development of cardiovascular diseases. The present study was designed to characterize the biological antioxidant and anti-inflammatory properties of Opuntia species and to investigate whether Opuntia cladodes prevent the development of atherosclerosis in vivo, in apoE−KO mice. The effects of the two Opuntia species, the wild Opuntia streptacantha and the domesticated Opuntia ficus-indica, were tested on the generation of intra- and extracellular reactive oxygen species (ROS) production and kinetics of the LDL oxidation by murine CRL2181 endothelial cells and on the subsequent inflammatory signaling leading to the adhesion of monocytes on the activated endothelium and the formation of foam cells. Opuntia species blocked the extracellular ROS (superoxide anion) generation and LDL oxidation by CRL2181, as well as the intracellular ROS rise and signaling evoked by the oxidized LDL, including the nuclear translocation of the transcription factor NFκB, the expression of ICAM-1 and VCAM-1 adhesion molecules, and the adhesion of monocytes to CRL2181. In vivo, Opuntia significantly reduced the formation of atherosclerotic lesions and the accumulation of 4-hydroxynonenal adducts in the vascular wall of apoE-KO mice, indicating that Opuntia cladodes prevent lipid oxidation in the vascular wall. In conclusion, wild and domesticated Opuntia species exhibit antioxidant, anti-inflammatory, and antiatherogenic properties which emphasize their nutritional benefit for preventing cardiovascular diseases. © 2015, University of Navarra. Source

Keller J.,French National Institute for Agricultural Research | Camare C.,French Institute of Health and Medical Research | Camare C.,Toulouse 1 University Capitole | Bernis C.,French Institute of Health and Medical Research | And 10 more authors.
Journal of Physiology and Biochemistry

Opuntia species have been used for thousands of years as a folk medicine in the treatment of diseases. However, the components and protective mechanisms are still unclear. We make the hypothesis that Opuntia species may protect the development of oxidative stress-associated diseases, such as atherosclerosis or colon cancer, via their antioxidant properties. We investigated the protective effect of Opuntia cladode powder against the oxidation of low-density lipoprotein (LDL) evoked by vascular endothelial cells, an important risk factor for atherosclerosis development, and the toxicity of 4-hydroxynonenal (a major lipid peroxidation product) on normal (Apc +/+) and preneoplastic (Apc min/+) immortalized epithelial colon cells. Various Opuntia species classified according to their degree of domestication, from the wildest (Opuntia streptacantha, Opuntia hyptiacantha, Opuntia megacantha), medium (Opuntia albicarpa), to the most domesticated (Opuntia ficus-indica) were tested. Cladode powders prepared from these Opuntia species significantly inhibited LDL oxidation induced by incubation with murine endothelial cells and the subsequent foam cell formation of RAW 264.7 murine macrophages and cytotoxicity on murine endothelial cells. Moreover, Opuntia cladode powder blocked the promotion of colon cancer development on an in vitro model of colonocytes. It may be noted that the phenolic acid and flavonoids content, the antioxidant capacity, and the protective effect were relatively similar in all the cladode powders from wild (O. streptacantha) and domesticated Opuntia. Altogether, these data confirm the therapeutic potential of Opuntia cladodes in diseases associated with oxidative stress. © 2015, University of Navarra. Source

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