Physical activity and fat mass gain in Mexican school-age children: a cohort study

Abstract Background In México, the prevalence of unhealthy weight increased from 24% at 6 y to 33% at 12 y of age, opening a window of opportunity to better understand the pathogenesis of obesity. The objective of this study was to explore the association between time spent on medium, vigorous physical activity (MVPA) and concurrent gains in BMI, fat mass (FM) and fat-free mass (FFM), alternately, in a cohort of Mexican children followed from kindergarten (baseline) to 2nd grade elementary school (endline). Methods The MVPA (5-d accelerometry), BMI, FM and FFM (air displacement plethysmography) were measured at baseline and endline. Associations between gains in BMI, FM and FFM and changes in MVPA were examined using lagged and dynamic regression models, controlling for energy intake and demographic variables. Results A total of 205 children were analyzed. Gender affected the effect of MVPA on FM gain. In girls, a high baseline MVPA predicted a lower FM gain (-0.96 kg, p=0.025) compared to low/medium MVPA. Increasing, decreasing or having a persistently high MVPA predicted a lower FM gain (range -1.6 to -1.03 kg, p Conclusion These results support a protective role of MVPA on FM gain in girls, suggesting that it may play a crucial role in the development of obesity. Further research on the gender effect of MVPA is warranted to better understand its role in the prevention and control of overweight and obesity. </p

Study of a spherical photonic crystal with conducting nano shell and a nano particle core

We discuss the effects of a 3D Metallo Dielectric Photonic Crystal with both a metallic core and a metallic shell as basic elements. We discuss the formed cavity as well as the dielectric stack in a structured sphere. © 2010 Optical Society of America

Evidence for protection of targeted reef fish on the largest marine reserve in the Caribbean

Metallic nanoparticles, of a few nanometers radii, show nonlinearities that are the object of experimental and theoretical studies, in particular in the framework of composites. A quantum mechanical analysis of such structures predict a Kerr type nonlinearity, however quite a recent publication on a classical approach has shown that a classical metallic nanoparticles composite shows a nonlinearity proportional to the electric field amplitude, not to the intensity as is in the Kerr case. The capability of filling up the core of a piece fiber with such composites open the possibility of preparing long enough pieces of fiber with such a composite as well as the straightforward drawing of a fiber doped with nanoparticles. In this work we carry on the numerical simulation on such class of fibers, with the specific aim of looking at the corresponding soliton propagation in an optical fiber with a core doped metal nanoparticles. " 2009 SPIE.",,,,,,"10.1117/12.839854",,,"http://hdl.handle.net/20.500.12104/43204","http://www.scopus.com/inward/record.url?eid=2-s2.0-70449557114&partnerID=40&md5=7e41b05555b5e864d0bc6a2fc045628d",,,,,,,,"Proceedings of SPIE - The International Society for Optical Engineering",,,,"7386",,"Scopus",,,,,,,,,,,,"Nonlinear pulse propagation in an optical fiber doped with conducting nano-particles",,"Conference Paper" "43140","123456789/35008",,"Pina-Amargós, F., Centro de Investigaciones de Ecosistemas Costeros, Cayo Coco, Morán, Ciego de Ávila, Cuba; González-Sansín, G., Department of Studies for Sustainable Development of the Coastal Zone, University of Guadalajara, Jalisco, Mexico; Martín-Blanco, F., Florida Fish andWildlife Conservation Commission, Fish and Wildlife Research Institute, Tequesta, FL, United States; Valdivia, A., Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States",,"Pina-Amargos, F

Hypertensive intracerebral hemorrhage in the very elderly

We discus the changes introduced in switching, bistability and chirping of a one dimensional photonics crystal made up of conducting nanoparticles composites modelled classically and quantum mechanically. " Optical Society of America.",,,,,,,,,"http://hdl.handle.net/20.500.12104/43358","http://www.scopus.com/inward/record.url?eid=2-s2.0-84896765761&partnerID=40&md5=ad2d4a1fc7df95064a0cbc21c99503b6",,,,,,,,"Optics InfoBase Conference Papers",,,,,,"Scopus",,,,,,,,,,,,"One dimensional photonic crystal with conducting nanoparticles composite",,"Conference Paper" "43794","123456789/35008",,"Chiquete, E., Department of Neurology and Neurosurgery, Hospital Civil de Guadalajara Fray Antonio Alcalde, Guadalajara, Mexico, Department of Neurosciences, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Guadalajara, Mexico; Ruiz-Sandoval, M.C., Department of Neurology and Neurosurgery, Hospital Civil de Guadalajara Fray Antonio Alcalde, Guadalajara, Mexico, Department of Neurosciences, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Guadalajara, Mexico; Álvarez-Palazuelos, L.E., Department of Neurology and Neurosurgery, Hospital Civil de Guadalajara Fray Antonio Alcalde, Guadalajara, Mexico; Padilla-Martínez, J.J., Department of Neurology and Neurosurgery, Hospital Civil de Guadalajara Fray Antonio Alcalde, Guadalajara, Mexico; González-Cornejo, S., Department of Neurology and Neurosurgery, Hospital Civil de Guadalajara Fray Antonio Alcalde, Guadalajara, Mexico; Ruiz-Sandoval, J.L., Department of Neurology and Neurosurgery, Hospital Civil de Guadalajara Fray Antonio Alcalde, Guadalajara, Mexico, Department of Neurosciences, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Guadalajara, Mexico, Servicio de Neurología Y Neurocirugía, Hospital Civil de Guadalajara Fray Antonio Alcalde, Torre de Especialidades, Col. El Retiro, Guadalajara, Jalisco CP 44280, Mexico",,"Chiquete, E

Rev Gastroenterol Mex

INTRODUCTION: Liver disease is currently one of the leading causes of death in older adults and the only option deemed curative is liver transplantation. However, it is uncertain whether the successful results obtained in older adults that receive a liver transplant in developed countries can be replicated in developing countries. AIM: To determine if there are differences in the survival time between older (>/=60years) and younger adults that underwent liver transplantation at a university-affiliated tertiary care center in Mexico City. MATERIALS AND METHODS: A 2-year longitudinal study was conducted. It included 244 participants that were divided into 2groups according to age at the time of transplantation: older adults (>/=60years) and younger adults (18-59years). Survival time was defined as the number of days that elapsed between transplantation and death. Survival was expressed as Kaplan-Meier curves. RESULTS: Median age in the older adults (n=52) was 63.0 (IQR=60-69) and 23 participants were females (44.2%). In the younger adults (n=196) median age was 47.0 (IQR=16-59) and 104 were females (52%). The leading indication for transplant was hepatitisC virus. After the follow-up, fifteen participants died (12 younger adults and 3 older adults). No significant differences were observed between older and younger participants in postoperative complications, the number of re-admissions, or mean post-transplantation survival time. CONCLUSIONS: There were no statistically significant differences in relation to survival times between older and younger adults that received a liver transplant. Older patients in developing countries should not be excluded from the selection process due only to age

One dimensional photonic crystal with conducting nanoparticles composite

We discus the changes introduced in switching, bistability and chirping of a one dimensional photonics crystal made up of conducting nanoparticles composites modelled classically and quantum mechanically. © Optical Society of America

Nonlinear pulse propagation in an optical fiber doped with conducting nano-particles

Metallic nanoparticles, of a few nanometers radii, show nonlinearities that are the object of experimental and theoretical studies, in particular in the framework of composites. A quantum mechanical analysis of such structures predict a Kerr type nonlinearity, however quite a recent publication on a classical approach has shown that a classical metallic nanoparticles composite shows a nonlinearity proportional to the electric field amplitude, not to the intensity as is in the Kerr case. The capability of filling up the core of a piece fiber with such composites open the possibility of preparing long enough pieces of fiber with such a composite as well as the straightforward drawing of a fiber doped with nanoparticles. In this work we carry on the numerical simulation on such class of fibers, with the specific aim of looking at the corresponding soliton propagation in an optical fiber with a core doped metal nanoparticles. © 2009 SPIE

Characterization of metal-dielectric photonic crystals

Abstract We discuss a new photonic crystal structure that arise out of including extremely thin metallic inserts in a standard dielectric photonic crystal (DPC). We had denominated dielectric-metallic photonic crystal (DMPC) to these combined structures to distinguish them from the metal dielectric photonic crystal (MDPC) with a single dielectric substrates and DPC, even when they preserve features from both, they have features of their own as a metal-dielectric structure. In this work, we numerically analyze a dielectric-metallic photonic crystal in a microsphere arrangement, characterizing the corresponding Bragg frequency and the dielectric and metallic stopgaps. In particular, we are interested in the dependence of the dielectric width r D and the metallic width r M respectively, as functions of the refraction index difference and the metal thickness d. We also discuss the structural flexibility introduced by the dielectric-metallic photonic crystal in the stopgaps pattern

Relaciones internacionales: nuevos actores y nuevas agendas. Diálogos del Pensamiento 250

Uno de los cambios más importantes que se han observado en el sistema internacional en las últimas cuatro décadas, ha sido el creciente protagonismo de actores no tradicionales en las relaciones internacionales. Estas nuevas voces que emergen pueden ser complementarias o contrarias a la del Gobierno central. En este sentido, el enfoque clásico de las relaciones internacionales que consideraba al Estado como el único actor del sistema internacional, ya no se corresponde al mundo contemporáneo y se vuelve incapaz de explicar un fenómeno como éste que se ha denominado con neologismos tales como paradiplomacia o diplomacia multinivel, cobrando un considerable interés en los ámbitos académico y político. ¿Cuáles son los sucesos coyunturales que propician la incorporación de nuevos actores internacionales en las dinámicas globales? ¿Cómo están respondiendo las universidades a los nuevos retos que se abren en el campo de las Relaciones Internacionales? Sobre esto platicamos con el Dr. Ray Freddy Lara Pacheco, el Dr. Daniel Villarruel Reynoso y la Mtra. Viviana Ávila Gómez, quienes además de ser expertos en el tema, nos presentan el programa de Maestría en Relaciones Internacionales de los Gobiernos y Actores Locales