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Search Results: 1 - 10 of 329682 matches for " E.; Rivera Díaz "
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Nanoparticles as Drug Delivery Systems in Cancer Medicine: Emphasis on RNAi-Containing Nanoliposomes
Mónica Rivera Díaz,Pablo E. Vivas-Mejia
Pharmaceuticals , 2013, DOI: 10.3390/ph6111361
Abstract: Nanomedicine is a growing research field dealing with the creation and manipulation of materials at a nanometer scale for the better treatment, diagnosis and imaging of diseases. In cancer medicine, the use of nanoparticles as drug delivery systems has advanced the bioavailability, in vivo stability, intestinal absorption, solubility, sustained and targeted delivery, and therapeutic effectiveness of several anticancer agents. The expansion of novel nanoparticles for drug delivery is an exciting and challenging research filed, in particular for the delivery of emerging cancer therapies, including small interference RNA (siRNA) and microRNA (miRNAs)-based molecules. In this review, we focus on the currently available drug delivery systems for anticancer agents. In addition, we will discuss the promising use of nanoparticles for novel cancer treatment strategies.
DEGRADACIóN DE SUELOS POR ACTIVIDADES ANTRóPICAS EN EL NORTE DE TAMAULIPAS, MéXICO
M. Espinosa Ramírez,E. Andrade Limas,P. Rivera Ortiz,A. Romero Díaz
Papeles de Geografía , 2011,
Abstract: La degradación de los suelos es un proceso que puede estar inducido por el hombre y que disminuye la capacidad actual y/o futura para sostener la vida humana. En este trabajo se estudia la Zona II de la Cuenca de Burgos (México) con el objetivo de evaluar y conocer los distintos tipos de degradación, originada por la acción antrópica. Para ello se delimitaron los tipos de suelo, se seleccionaron áreas representativas para realizar perfiles de suelos y se evaluó la degradación de los mismos siguiendo la metodología de ASSOD (Van Lyden, 1997). Los resultados muestran como el 74% del área estudiada presenta evidencias de degradación. Los tipos dominantes son: erosión hídrica, compactación y erosión eólica. Las causas principales son el sobrepastoreo y las prácticas agrícolas superficiales, a lo que hay que a adir las actividades industriales recientes de PEMEX. La degradación más acusada se presenta en Calcisoles. Los Leptosoles, por el contrario, tienen menor degradación, pero es en donde se da la mayor actividad industrial.
Elaboración, Validación y Estandarización de un Inventario para Evaluar las Dimensiones Atributivas de Instrumentalidad y Expresividad
Rolando Díaz Loving,Tania E. Rocha Sánchez,Sofía Rivera Aragón
Revista Interamericana de Psicología , 2004,
Abstract: El interés por explorar las dimensiones psicológicas de la masculinidad-feminidad ha desembocado en la creación de diversos instrumentos de medición. Con el propósito de elaborar y validar un inventario de las características instrumentales y expresivas deseables e indeseables, emanado de la cultura mexicana, se aplicó a 282 mujeres y 355 hombres, un cuestionario de auto-reporte elaborado a partir del estudio normativo de Díaz-Loving, Rivera- Aragón y Sánchez-Aragón. El listado original, rescatado de grupos focales y validado con una muestra amplia sobre estereotipos instrumentales y expresivos de las adscripciones típicas e ideales en hombres y mujeres, arrojaron 323 adjetivos que engloban las características sensibles a la cultura y que conforman los constructos de masculinidad y feminidad. En el presente estudio, con base en los adjetivos originales, se elaboró un instrumento que evalúa 117 rasgos instrumentales y expresivos en los mexicanos. Los resultados derivados de los análisis psicométricos obtenidos, y que se presentan en función de la conceptualización de los rasgos masculinos y femeninos en la cultura mexicana, muestran tres factores instrumentales socialmente deseables y tres socialmente indeseables, dos expresivos socialmente deseables y tres indeseables, tanto en hombres como mujeres. La claridad conceptual y el peso estadístico de la configuración de las dimensiones obtenidas del análisis factorial y la consistencia interna derivada de las alfas de Cronbach y de las interrelaciones de escalas, confirman la validez confiabilidad y sensibilidad cultural del constructo teórico y de la operacionalización presentada
Colgajo de trapecio extendido en reconstrucción de defectos causados por resección de tumores de cabeza y cuello Extended trapezius fasciomyocutaneous flap for reconstruction after head and neck tumoral resection
A.A. Leal Salazar,E. Cabrera Sánchez,P. Rivera Díaz,J. Galache Collell
Cirugía Plástica Ibero-Latinoamericana , 2011,
Abstract: Los defectos originados por la resección de tumores en cabeza y cuello pueden ser de difícil resolución. Presentamos un caso clínico en el que se practicó reconstrucción usando el colgajo fasciomusculocutáneo de trapecio extendido basado en la arteria dorsal escapular. Este colgajo puede alcanzar el cuello, la órbita y el vértex del cráneo; por lo tanto, puede ser de utilidad para el tratamiento de grandes defectos en estas áreas. Head and neck defects caused by tumoral resection could be a difficult task for a plastic surgeon. We present a clinical case of reconstruction using an extended trapezius myocutaneous flap based on dorsal scapular artery, in the occipital region. This flap can reach the neck, the orbit and the vertex of the head so it may be useful for treating large defects in these areas.
Dyslipidaemias and Physical Activity in Children with Cerebral Palsy  [PDF]
Maciste Habacuc Macías-Cervantes, Martha Susana Arriola-Nu?ez, Francisco J. Díaz-Cisneros, Antonio E. Rivera-Cisneros, José María de la Roca-Chiapas, Victoriano Pérez-Vázquez
Health (Health) , 2014, DOI: 10.4236/health.2014.610129
Abstract: Cerebral palsy people present movement difficulty and are liable to develop disorders associated with sedentary lifestyles such as dyslipidaemias and cardiovascular diseases. This study aimed to assess physical activity and the prevalence of lipid abnormalities in 29 children with cerebral palsy who were being treated in two care centers in the state of Guanajuato, Mexico. Physical activity was calculated using a survey. Blood glucose, total cholesterol, HDL-C, LDL-C, and triglycerides were determined. Forty-eight percent had at least one dyslipidaemia. The most frequent lipid abnormalities were hypertriglyceridaemia and low HDL-C. High prevalence of the atherogenic index was found. The physical activity of children was lower than recommended for their age. Sixty-two percent attended rehabilitation sessions, 10% attended sports classes, 14% rehabilitation plus sports and 14% did not engage in intentional physical activity. There is high frequency of lipid disorders in children with cerebral palsy. Greater participation in physical activity should be promoted in children to improve their metabolic status and quality of life, especially those suffering from cerebral palsy.
Productividad y autonomía en sistemas de producción ovina: Dos propiedades emergentes de los agroecosistemas
Vilaboa Arroniz,Julio; Díaz Rivera,Pablo; Platas Rosado,Diego E; Ortega Jiménez,Eusebio; Rodríguez Chessani,Miguel A;
Interciencia , 2006,
Abstract: the low meat production per animal and the excessive dependence on inputs such as: manpower and feed, as well as high production cost in sheep production systems and the lack of knowledge on the degree of dependence on them, limit competitiveness in the sheep industry. the object of this study was to carry out a productivity and autonomy analysis of two sheep production systems in the state of veracruz, mexico, under agroecosystems approach. during 2004 these two emergent proprieties of agroecosystems were analyzed in two ovine farms located in the central zone of the state of veracruz. productivity was evaluated according to biological efficiency, taking into consideration annual meat production per ha (pc /ha/year) and global feed conversion (ca). autonomy was evaluated by labour autonomy (al), feeding autonomy (aa) and economic autonomy (ae), taking into consideration employed manpower, foods produced in the system and total utilized foods converted to monetary value; total proportion of inputs produced in the farm and total amount of utilized inputs transformed to monetary value. techniques of semi-structured interviews were applied. for farm "a", pc /ha/year was 917.8kg and 32.8kg/ewe/year and ca was 0.01. al, aa and ae were 0; 40 and 18.5% respectively. for farm "b", pc /ha/year was 380.9kg and 57.2 kg/ewe/year and ca was 0.01. al, aa and ae were 42.4; 71.1 and 52.3% respectively.
Seroprevalencia de anticuerpos IgG contra parvovirus B19 en donantes de sangre de hospitales en Santiago, Chile
Gaggero,Aldo; Rivera,Joselin; Calquín,Elizabeth; Larra?aga,Carmen E; León,Oscar; Díaz,Patricia; Gaggero,Nicolás;
Revista médica de Chile , 2007, DOI: 10.4067/S0034-98872007000400005
Abstract: background: parvovirus b19 (b19) is associated with a wide range of disease manifestations, whose severity depends on the immunological and hematological status of the host. infection with b19 has been reported worldwide and the prevalence of immunoglobulin g antibodies against b19 increases with age and varies by location and time of the last b19 epidemic. aim: to evaluate the prevalence of igg antibodies against parvavirus b19 virus in a population of volunteer blood donors at two hospital blood banks in santiago, chile. material and methods: a total of 400 serum samples from blood donors aged 18 to 65 years, were examined for the presence of igg antibodies against parvovirus b19. results: the overall prevalence of igg antibodies was 54.8%. no significant difference was found between men and women (57.6% and 49.3%, respectively). conclusions: igg antibody seroprevalence against parvovirus b19, was 55% in this sample of chilean blood donors. this figure is in agreement with previous reports from abroad
Manejo del dolor no obstétrico durante el embarazo Management of non-obstetric pain during pregnancy
Roberto Rivera Díaz,Adriana Lopera Rivera
Revista Colombiana de Anestesiología , 2012,
Abstract: Introducción: La mujer embarazada experimenta dolor por causas diferentes al trabajo de parto o al parto. Durante el embarazo pueden presentarse síndromes dolorosos agudos o se agudizan dolores crónicos que deben ser tratados, asegurándose siempre de mantener la seguridad para la madre y el feto. Objetivo: Realizar una revisión de la literatura científica acerca del manejo del dolor de causas no obstétricas durante el embarazo, y las posibilidades e implicaciones de las diferentes terapias disponibles tanto farmacológicas como intervencionistas. Materiales y niétodos: Revisión no sistemática. Se consultaron las siguientes bases de datos: Medline, Pubmed, FDA y Drugs, en búsqueda de artículos en inglés relevantes. Resultados: Se seleccionaron los artículos correspondientes a los diferentes tipos de terapia disponibles en el manejo del dolor durante el embarazo. Conclusión: El manejo integral de las patologías que pudieran generar dolor durante el embarazo requiere del uso de medicamentos que no siempre son 100% seguros. Su tratamiento debe ser interdisciplinario y humanizado, teniendo en cuenta las implicaciones para la madre y el feto, y mientras sea posible, optimizando alternativas terapéuticas no farmacológicas. Introduction: In pregnancy, women experience pain for reasons other than labor or delivery. Painful syndromes may occur during pregnancy, or chronic pain may become more acute, and patients should be offered treatment, always bearing in mind maternal and fetal safety. Objective: To conduct a review of the scientific literature on the management of non-obstetric pain during pregnancy and the potential implications of the different pharmacological and interventional therapies available. Materials and methods: Non-systematic review in the following databases: Medline, Pubmed, FDA and Drugs with a search of relevant articles in English. Results:The articles related to the various types of therapies for pain management during pregnancy were selected. Conclusion: The comprehensive approach to the management of conditions that may produce pain during pregnancy requires the use of medications that are not always 100% safe. Treatment must be inter-disciplinary and humanized, and consider the implications for the mother and fetus, optimizing, whenever possible, non-pharmacological therapeutic options.
Colgajo de trapecio extendido en reconstrucción de defectos causados por resección de tumores de cabeza y cuello
Leal Salazar,A.A.; Cabrera Sánchez,E.; Rivera Díaz,P.; Galache Collell,J.; Rioja Torrejón,L.F.;
Cirugía Plástica Ibero-Latinoamericana , 2011, DOI: 10.4321/S0376-78922011000400010
Abstract: head and neck defects caused by tumoral resection could be a difficult task for a plastic surgeon. we present a clinical case of reconstruction using an extended trapezius myocutaneous flap based on dorsal scapular artery, in the occipital region. this flap can reach the neck, the orbit and the vertex of the head so it may be useful for treating large defects in these areas.
Efecto del acondicionamiento con calor en la susceptibilidad al da?o por frío de lima persa (Citrus latifoliaTanaka)
Bosquez Molina,E; Domínguez Soberanes,J; Perez Flores,L; Bautista Ba?os,S; Díaz de León Sánchez,F; Rivera-Cabrera,F;
Phyton (Buenos Aires) , 2008,
Abstract: cold storage is one of the most important technologies used to maintain the postharvest quality of many horticultural commodities. however, cold storage is restricted for persian lime because of its susceptibility to chilling injury. the objective of this study was to evaluate the effects of high temperature conditioning on the susceptibility to chilling injury in persian lime (citrus latifolia tanaka). it was harvested in martínez de la torre, veracruz, mexico, and stored at different refrigeration temperatures. after harvesting, fruits received the following treatments: (1) hot water conditioning (53 °c during 3 min); (2) hot air conditioning ( 38 °c, 90-95 % relative humidity for 3 d), and (3) no treatment (control). following treatments, fruits were stored at three different temperatures: 4, 8 or 13 ± 1 °c. chilling injury, weight loss, color, juice percentage, tritatable acidity, ph and total soluble solids were evaluated after 3, 6, 9, 12, 15, 20, 25 and 30 days. results showed that both conditioning treatments induced more susceptibility to chilling injury.
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