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Search Results: 1 - 10 of 17118 matches for " Manuel Sandoval "
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La internacionalización del capital y el proceso de industrialización de la frontera México-Estados Unidos
Juan Manuel Sandoval
Nueva antropología , 1985,
El proceso de trabajo en el proceso de hominización
Juan Manuel Sandoval
Nueva antropología , 1984,
Militarización, seguridad nacional, seguridad pública en México.
Juan Manuel Sandoval Palacios
Espiral , 2000,
The hypergeneralized Heun equation in QFT in curved space-times
Davide Batic,Manuel Sandoval
Physics , 2008, DOI: 10.2478/s11534-009-0107-8
Abstract: In this article we show for the first time the role played by the hypergeneralized Heun equation (HHE) in the context of Quantum Field Theory in curved space-times. More precisely, we find suitable transformations relating the separated radial and angular parts of a massive Dirac equation in the Kerr-Newman-deSitter metric to a HHE.
The Adoption of e-Government Services in Mexico: A Citizens’ Perception Analysis  [PDF]
Juan Manuel Gomez-Reynoso, Rodrigo Sandoval-Almazan
American Journal of Industrial and Business Management (AJIBM) , 2013, DOI: 10.4236/ajibm.2013.36A002
Abstract: Governments have provided services to citizens by using means such as: face-to-face, regular mail, telephone, among others. These services have been proven to be good channels of communication and interaction, but they have limitations. For example, services are provided only on time and days previously established and not all government personnel are service-oriented. These services can be improved by using information and communication technologies. Therefore, these are some reasons why the Mexican government has been pursuing the implementation of services over the Internet so that users can have access any time. In the present research an existing model proposed in the previous research [1] was adapted and analyzed in order to understand whether it is suitable to Mexican e-government efforts. Data collection was made through an online survey, which was answered for 217 citizens from all 32 Mexican states. Results show that such model is not suitable for the Mexican case; this could be due to cultural, demographic and economic differences. Thus, further research that identifies a new model is needed.
Teniasis en el siglo XXI Taeniasis in the 21st century
M. Villafruela,J. de Manuel,A. Sandoval
Revista Espa?ola de Enfermedades Digestivas , 2009,
Does Computer Navigation Improve the Results of MIS Technique in Total Knee Arthroplasty?  [PDF]
Alfonso Fernandez Noriega, Daniel Hernandez Vaquero, Jesus Fernandez Lombardia, Javier Alonso Figaredo, Manuel A. Sandoval Garcia
International Journal of Clinical Medicine (IJCM) , 2013, DOI: 10.4236/ijcm.2013.46A002
Abstract: The Minimal Invasive Surgery (MIS) technique used for knee arthroplasty implantation implies a less aggressive surgery and reduces the aesthetic impact. Its most notable disadvantage is the poor visualization of bone structures, which may lead to alterations in the correct placement of the prosthetic components. Navigation-assisted surgery may help avoid such mistakes, and thus navigation coupled with the MIS technique may be an alternative for the future. This is a prospective randomized study of 50 patients who received a total knee arthroplasty. In 25 cases the MIS technique was used, whereas in the other 25 navigation was also employed. Mean age of the patients was 71.63 years, and the mean body mass index was 31.19. Results were assessed based on the definitive radiographic position of the femoral, tibial, and limb axis prosthetic components, as well as according to the Visual Analogue Scale (VAS), the Knee Society Score (KSS), Western Ontarioand McMaster Universities Arthritis Index (WOMAC), Short Form version 12 (SF-12) questionnaires, and the up-and-go test. Differences were found between both groups for duration of the procedure (p = 0.0005). No differences were found in the need for analgesics, amount of drained blood, or mean stay time. There were differences regarding the best radiographic position of the tibial component in the navigation group, but not in the final mechanical axis of the limb, even though out-of-range cases were more abundant in the standard-MIS group. At one year after surgery, clinical, functional and quality of life outcomes were similar in both groups. The combined use of surgical navigation and the MIS technique does not yield advantages in terms of limb alignment nor clinical results at one year after surgery.
Quito Municipal Schools—Cohort Study: Self-Perception of Body Image and Factors Related with It  [PDF]
Natalia Romero-Sandoval, Oscar Flores, Carmen Egas, Gabriela Villamar, Zuleica Larrea, Manuel Cruz, Laura Icaza, Miguel Martín
Open Journal of Epidemiology (OJEpi) , 2014, DOI: 10.4236/ojepi.2014.43017

Self-perception of body image is one factor to be considered when planning and performing preventive initiatives and interventions in childhood and adolescence. The aim of this study was to analyse self-perception of body image in relation to body-mass index, physical inactivity, not eating breakfast, dieting, smoking and alcohol consumption or toxic habits. Materials and Methods: using data from the “Quito municipal schools” cohort study 6964 students aged from 9 to 17 years were described using a multivariate log linear model of the multidimensional table generated by the variables. A logistic regression model was then fitted to assess associations via OR. Results: 8.2% perceived themselves as overweight. Of those subjects overweight according to their BMI, 21.8% perceived themselves as such, while among those not overweight according to BMI, 96.8% considered themselves as slim or of normal weight. Among students who were dieting, 15.1% perceived themselves as overweight. Among those pupils who perceived themselves has having excess weight, the most common reasons for dieting were: lose weight (56.8%), be healthier (22.6%), and maintain current weight (8.4%). Self-perception of excess weight interacts with excess weight (ORadjusted 8.42; CI95% 6.92-10.25), no breakfast (ORadjusted 2.83; CI95% 2.13-3.77), diet (ORadjusted 2.38; CI95% 1.95-2.89), and with all the variables except toxic habits (ORadjusted 1.01; CI95% 0.78 a 1.29). Conclusion: Interventions to prevent obesity in childhood and adolescence ought to take account of

Current State of the Surgical Treatment of Atrial Fibrillation
Elena Sandoval,Manuel Castella,Jose-Luis Pomar
Cardiology Research and Practice , 2011, DOI: 10.4061/2011/746054
Abstract: Surgery of atrial fibrillation (AF) was first described in 1991 by James Cox in what was named the Cox-Maze procedure, and over the years it has been considered the gold-standard treatment, with best results in maintaining sinus rhythm in the long term. Nevertheless, the complexity and aggressivity of the first techniques of cut-and-sew limited the application of this procedure, and few centers were dedicated to AF surgery. In the past years, however, new devices able to ablate atrial tissue with cryotherapy, radiofrequency, or ultrasounds have facilitated this operation. In the mid-term, other energy devices with laser or microwave have been abandoned due to a lack of consistency in getting transmural lesions in a consistent and reproducible manner. Additionally, better knowledge of the physiopathology of AF, with the importance of triggering zones around the pulmonary veins, has started new minimally invasive techniques to approach paroxysmal and persistent AF patients through thoracoscopy. 1. Introduction Atrial fibrillation (AF) is the most common cardiac arrhythmia, affecting 1% of the general population and with its prevalence increasing with age [1]. Most important, AF has well-documented consequences as disabling symptoms, elevated stroke risk and major risk of congestive cardiac failure, being an independent predictor of death [2]. In summary, it represents a high cost on the health public systems of most developed countries. Surgeons were the first ones to treat AF effectively and reverse it to sinus rhythm. James Cox described a series of surgical procedures known as Cox-Maze technique, between 1988 and 1991, that crystallized in the Cox-Maze III. This surgical approach was directed to divide both right and left atria by a series of cuts and sutures to redirect the electrical impulse to close-end paths, to finalize atrial depolarization, and be ready for the next sinus node impulse. This operation also included the exclusion of both atrial appendages and the isolation of the four pulmonary veins and the posterior wall of the left atrium. Although very effective, with over 91% patients maintaining sinus rhythm at 10 years, few surgical groups performed the Cox-Maze procedure due to the aggressiveness of it, with long suture lines and prolonged myocardial ischemic times [3, 4]. In the last decade, three factors have changed the approach of surgeons to AF: first, a better understanding of the electrophysiological basis of AF. In 1998, Haissaguerre described that most patients with paroxysmal AF have electric triggering zones localized within the
Efecto tóxico de beta-cipermetrina, deltametrina y fenitrotión en cepas de Triatoma dimidiata (Latreille, 1811) y Triatoma maculata (Erichson, 1848) (Hemiptera, Reduviidae)
Reyes,Marlene; Angulo,Víctor Manuel; Sandoval,Claudia Magaly;
Biomédica , 2007,
Abstract: introduction. the susceptibility to insecticides of triatomine species must be evaluated because of their involvement in the transmission of the chagas disease. in each region with chagas endemicity, evaluation of insecticide response is necessary to predict the success of the control campaigns. objective. the baseline susceptibility was determined for the active principles deltamethrin, b-cypermethrin and fenitrothion in nymphs of first and fifth instar of triatoma dimidiata and nymphs of first instar of triatoma maculata. materials and methods. the insecticide activity in triatomines was evaluated by the technique of topical application. results. the values of the ld50 in nymphs of first instar for t. maculata, expressed in nanograms per insect (ng/i), were 0.07, 0.05 and 4.12 for deltamethrin, b-cypermethrin and fenitrothion respectively. the corresponding ld99 values were 1.08, 0.37 and 17.89 ng/i. in t. dimidiata, the ld50 values were 0.44, 0.46 and 16.45 ng/i; the ld99 values were 2.22, 1.97 and 36.07 ng/i. in nymphs of fifth instar t. dimidiata, the ld50 values were 510.7, 1,623.6 and 838.9 ng/i; the ld99 values were 9,607.5, 11,717.9 and 1,525.0 ng/i, respectively. conclusion. in first instar nymphs of t. dimidiata and t. maculata, the pyrethroid insecticides were more effective; in fifth instar nymphs of t. dimidiata, the effectiveness of the pyrethroids and the organophosphate differed in the ld50 comparison-the nymphs required much higher doses compared with the other triatomines and suggested a low susceptibility. the ld99 for the organophosphate (fenitrothion) was significantly lower and may indicate its greater effectiveness in field. studies of synergistic effects amonst insecticides are important to clarify the role of biochemical mechanisms that determine tolerance to the pyrethroids. insecticide tolerance represents a new challenge for control campaigns in the andean and central american countries where chagas disease is endemic.
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