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Search Results: 1 - 10 of 478806 matches for " Emma Marianela; Sánchez-Pérez "
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Parasitosis intestinal en ni os, en áreas de alta marginación socioeconómica de la región fronteriza de Chiapas, México
Morales-Espinoza Emma Marianela,Sánchez-Pérez Héctor Javier,García-Gil María del Mar,Vargas-Morales Guadalupe
Salud Pública de México , 2003,
Abstract: OBJETIVO: Estimar la prevalencia de parasitosis intestinal en ni os de zonas de alta marginación y su asociación con indicadores demográficos y socioeconómicos de interés. MATERIAL Y MéTODOS: En una muestra de 1478 menores de edad, de entre 1 a 14 a os, provenientes de 32 comunidades de la región fronteriza de Chiapas, México, de marzo a septiembre de 1998, se recolectaron tres muestras de heces fecales, seleccionadas aleatoriamente a partir del grado de marginación (alto y muy alto) del municipio al que pertenecen, y distancia de la unidad de salud más cercana a la comunidad (<1 hora; 1 hora o más). En una de cada cuatro viviendas con ni os menores de 15 a os de edad, seleccionadas aleatoriamente, se obtuvieron tres muestras de heces fecales de éstos. Se efectuaron análisis bivariados con la prueba de ji cuadrada y multivariados con modelos lineales generalizados. RESULTADOS: La prevalencia global de parasitosis fue de 67% (intervalo de confianza IC 95% 64-70%). Sesenta por ciento de los ni os estaban multiparasitados. La prevalencia de Entamoeba histolytica/E dispar fue de 51.2%, de Giardia lamblia, 18.3% y de Ascaris lumbricoides, 14.5%. La mayor prevalencia de E histolytica/E dispar se asoció con la edad y hablar algún idioma indígena; la de Ascaris lumbricoides con el sitio de obtención de agua y la carencia de refrigerador y electricidad. CONCLUSIONES: Es necesario hacer intervenciones locales de salud (calidad del agua, sistemas de desagüe), programas de educación sanitaria (promoción de la lactancia materna y medidas higiénicas) y promoción del habla de idiomas indígenas entre los médicos de la región.
Intestinal parasites in children, in highly deprived areas in the border region of Chiapas, Mexico
Morales-Espinoza,Emma Marianela; Sánchez-Pérez,Héctor Javier; García-Gil,María del Mar; Vargas-Morales,Guadalupe; Méndez-Sánchez,José Domingo; Pérez-Ramírez,Margarita;
Salud Pública de México , 2003, DOI: 10.1590/S0036-36342003000500008
Abstract: objective: to assess the prevalence of intestinal parasitic infections among children in highly deprived areas, and its possible association with demographic and socioeconomic indicators. material and methods: from march to september 1998 in a convenience sample of 32 communities of the border region of chiapas, mexico, selected at random based on the level of poverty and distance from the community to the nearest health care unit (<1 hour; 1 hour or more), one of every four households with children under 15 years of age was randomly selected to provide three stool samples from their children (n 1478). bivariate and multivariate (generalized linear models for correlated binary data) analysis were performed. results: the global prevalence of intestinal parasitosis was 67% (95% confidence interval [ci] 64-70%). sixty percent had multiple parasites. the prevalence of entamoeba histolytica/e dispar was 51.2%, that of giardia lamblia 18.3%, and that of ascaris lumbricoides 14.5%. multivariate analysis showed that age and speaking an indigenous language were significantly associated with the presence of e histolytica/ e dispar and giardia lamblia. source of water and lacking a refrigerator and electricity were associated with the presence of ascaris lumbricoides. conclusions: measures should be taken to improve water quality, sewage disposal, and domestic hygiene. furthermore, health programs should be established to promote breast-feeding, and education policies aimed at reinforcing the use of indigenous languages by physicians in the health services.
A Decomposition of the Atkinson Index through the Shapley Value  [PDF]
Joss Sánchez-Pérez
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.25100
Abstract: This paper studies the economic inequality as a phenomenon resulting from two variables: The variable of responsibility which depends on the agents’ performance in the economy, and the variable of opportunity which is independent of the individuals’ performance in the economy. Identifying the contribution of the inequality of opportunity in the total inequality as the problem to be measured, we propose a decomposition of the Atkinson inequality index, by using one of the central solution concepts of cooperative game theory, called the Shapley value.
Improving integrability via absolute summability: a general version of Diestel's Theorem
Daniel Pellegrino,Pilar Rueda,Enrique Sánchez-Pérez
Mathematics , 2015, DOI: 10.1007/s11117-015-0361-5
Abstract: A classical result by J. Diestel establishes that the composition of a summing operator with a (strongly measurable) Pettis integrable function gives a Bochner integrable function. In this paper we show that a much more general result is possible regarding the improvement of the integrability of vector valued functions by the summability of the operator. After proving a general result, we center our attention in the particular case given by the $(p,\sigma)$-absolutely continuous operators, that allows to prove a lot of special results on integration improvement for selected cases of classical Banach spaces ---including $C(K)$, $L^p$ and Hilbert spaces--- and operators ---$p$-summing, $(q,p)$-summing and $p$-approximable operators---.
Extreme points and geometric aspects of compact convex sets in asymmetric normed spaces
Natalia Jonard-Pérez,Enrique A. Sánchez-Pérez
Mathematics , 2014,
Abstract: Inspired in the theorem of Krein-Milamn, we investigate the existence of extreme points in compact convex subsets of asymmetric normed spaces. We focus our attention in the finite dimensional case, giving a geometric description of all compact convex subsets of a finite dimensional asymmetric normed space.
Compact convex sets in 2-dimensional asymmetric normed lattices
Natalia Jonard-Pérez,Enrique A. Sánchez-Pérez
Mathematics , 2014,
Abstract: We study the geometric structure of compact convex sets in 2-dimensional asymmetric normed lattices. We prove that every q-compact convex set is strongly q-compact and we give a complete geometric description of the compact convex sets with non empty interior in (R^2, q), where q is an asymmetric lattice norm.
La Gestión del Proyecto de Bioprótesis Cardiacas del Instituto Nacional de Cardiología: CCADET/ UNAM
Vega-González,R; Juárez Hernández,A; Sánchez-Pérez,E;
Journal of technology management & innovation , 2009, DOI: 10.4067/S0718-27242009000100013
Abstract: in this work we present the "cardiac innovation bioprótesis, 2002" technological management project case, developed by the centro de ciencias aplicadas y desarrollo tecnológico, ccadet of the universidad nacional autónoma de méxico, unam, for the instituto nacional de cardiología, inc, of the mexican health sector, with funds from the fondo sectorial salud of the consejo nacional de ciencia y tecnología, conacyt. the scope and specifications were initially unclear generating complications that become evident through the case development. littler (2006, pp. 116). we conclude that one of the most important activities of the incubation phase of the project technology management model of the ccadet is the specifications definition.
Nitrogen dynamics in the shallow groundwater of a riparian wetland zone of the Garonne, SW France: nitrate inputs, bacterial densities, organic matter supply and denitrification measurements
J. M. Sánchez-Pérez,P. Vervier,F. Garabétian,S. Sauvage
Hydrology and Earth System Sciences (HESS) & Discussions (HESSD) , 2003,
Abstract: This study highlights the role of interactions between surface and sub-surface water of the riparian zone of a large river (the Garonne, SW France). Information is given about the role of surface water in supplying Dissolved Organic Carbon (DOC ) to the riparian zone for nitrate removal processes. The densities of bacteria (up to 3.3 106 cell m L-1) in groundwater are strongly conditioned by the water moving during flood events. Total bacterial densities in groundwater were related to surface water bacterial densities. In sediment, total bacteria are attached mainly to fine particles (90% in the fraction < 1 mm). Spatial variations in organic carbon and nitrate content in groundwater at the site studied are correlated with exchanges between the groundwater and the river, from the upstream to the downstream part of the meander. Total bacterial densities, nitrate and decressing organic carbon concentrations follow the same pattern. These results suggest that, in this kind of riparian wetland, nitrate from alluvial groundwater influenced by agricultural practices may be denitrified by bacteria in the presence of organic carbon from river surface water. Keywords: riparian zone, nitrate removal, spatial variations, alluvial groundwater
A standardised method for measuring in situ denitrification in shallow aquifers: numerical validation and measurements in riparian wetlands
J. M. Sánchez-Pérez,C. Bouey,S. Sauvage,S. Teissier
Hydrology and Earth System Sciences (HESS) & Discussions (HESSD) , 2003,
Abstract: A tracer test to examine in situ denitrification in shallow groundwater by a piezometer with a packer system used bromide as a tracer of dilution and acetylene (10%) to block the denitrification process at the nitrous oxide stage. During the test, dissolved oxygen, nitrate (NO3 ̄), bromide (Br ̄), nitrous oxide (N2O) and dissolved organic carbon (DOC) were measured. To calibrate the experimental method, comparison with numerical simulations of the groundwater transfer were carried out, taking into account the environmental characteristics. The method was tested by measurements undertaken in different environmental conditions (geology, land use and hydrology) in two riparian wetlands. Denitrification rates measured by this method ranged from 5.7 10-6 g N-NO3 ̄L-1 h-1 to 1.97 10-3 g N-NO3 ̄L-1 h-1 The method is applicable in shallow aquifers with a permeability from 10-2 to 10-4m s-1. Keywords: denitrification, shallowaquifer, groundwater modelling, wetlands, nitrate-nitrogen, packer system
Laringomalacia en una cohorte de seguimiento del desarrollo infantil por antecedentes de encefalopatía perinatal: Implicaciones para su conceptualización nosológica
Mandujano-Valdés, Mario Antonio;Sánchez-Pérez, María del Carmen;
Gaceta médica de México , 2004,
Abstract: we conducted a retrospective analysis of 10 cases of congenital laryngeal stridor. reports of laryngeal endoscopy and diagnosis define laryngomalacia as laryngeal flaccidity and stridor. some authors postulate that in addition to immaturity of cartilage, there exist the possibility o flaryngeal uncoordination and dyskinesia. they support this idea in cases of late presentation, neurological damage, and atypical cases related with functional state or anesthesia. laryngeal endoscopies were carried out in 10 cases included in a cohort of subjects from a longitudinal follow-up diagnosed with neurologica damage of perinatal origin. one case was diagnosed with postoperative unilateral paralysis of vocal chord and another identified vascular ring. the eight remaining cases fulfilled laryngomalacia criteria of diagnosis, but because of their characteristics origin is not an anatomic alteration but a functional hypotonia. the need to carry out an integral study to describe co-morbidity is emphasized.
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