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Search Results: 1 - 10 of 462261 matches for " Mejía Mildred "
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Epidemiology of Chagas disease in Guatemala: infection rate of Triatoma dimidiata, Triatoma nitida and Rhodnius prolixus (Hemiptera, Reduviidae) with Trypanosoma cruzi and Trypanosoma rangeli (Kinetoplastida, Trypanosomatidae)
Monroy Carlota,Rodas Antonieta,Mejía Mildred,Rosales Regina
Memórias do Instituto Oswaldo Cruz , 2003,
Abstract: A five-year domiciliary collection in the 22 departments of Guatemala showed that out of 4,128 triatomines collected, 1,675 were Triatoma dimidiata (Latreille, 1811), 2,344 were Rhodnius prolixus Stal 1859, and only 109 were T. nitida Usinger 1939. The Chagas disease parasite, Trypanosoma cruzi, was found in all three species. Their natural infection rates were similar in the first two species (20.6%; 19.1%) and slightly lower in T. nitida(13.8%). However there was no significant difference in the infection rates in the three species (p = 0.131). T. dimidiata males have higher infection rates than females (p = 0.030), whereas for R. prolixus there is no difference in infection rates between males and females (p = 0.114). The sex ratios for all three species were significantly skewed. More males than females were found inside houses for T. dimidiata (p < 0.0001) and T. nitida (p = 0.011); a different pattern was seen for R. prolixus (p = 0.037) where more females were found. Sex ratio is proposed as an index to show the mobility of T. dimidiata in different populations. T. dimidiata is widely distributed in the country, and is also the main vector in at least ten departments, but R. prolixus with higher vectorial capacity is an important vector in at least two departments.
Geographic distribution and morphometric differentiation of Triatoma nitida usinger 1939 (Hemiptera: Reduviidae: Triatominae) in Guatemala
Monroy, Carlota;Bustamante, Dulce María;Rodas, Antonieta;Rosales, Regina;Mejía, Mildred;Tabaru, Yuichiro;
Memórias do Instituto Oswaldo Cruz , 2003, DOI: 10.1590/S0074-02762003000100006
Abstract: triatoma nitida was found in 14 (0.4%) out of 3,726 houses located in six departments across guatemala, which were surveyed from 1994 to 1998 by the man-hour collection method. compared to previous information, the distribution of t. nitida in guatemala has increased from five to nine departments; the species is present in mild climates at altitudes from 960 to 1,500 m. fourteen percent of the intradomestic t. nitida were infected with trypanosoma cruzi. the species was often found in conjunction with other triatomines (t. dimidiata and rhodnius prolixus). the domestic and peridomestic presence of t. nitida in guatemala was rare, but occasionally this species was colonizing human-made constructions. t. nitida appears to have a low importance as chagas disease vector in guatemala, as indicated by its scarce presence in the domestic habitats and defecation patterns. however, it clearly has potential to become a chagas vector so we recommend an on-going study of the intradomestic presence of t. nitida following the control programs in guatemala. morphometric analysis of 47 t. nitida males from three localities showed quantitative differences between the populations, which indicates that geographic distance is an important factor in the structuring of t. nitida populations.
Epidemiology of Chagas disease in Guatemala: infection rate of Triatoma dimidiata, Triatoma nitida and Rhodnius prolixus (Hemiptera, Reduviidae) with Trypanosoma cruzi and Trypanosoma rangeli (Kinetoplastida, Trypanosomatidae)
Monroy, Carlota;Rodas, Antonieta;Mejía, Mildred;Rosales, Regina;Tabaru, Yuichiro;
Memórias do Instituto Oswaldo Cruz , 2003, DOI: 10.1590/S0074-02762003000300003
Abstract: a five-year domiciliary collection in the 22 departments of guatemala showed that out of 4,128 triatomines collected, 1,675 were triatoma dimidiata (latreille, 1811), 2,344 were rhodnius prolixus stal 1859, and only 109 were t. nitida usinger 1939. the chagas disease parasite, trypanosoma cruzi, was found in all three species. their natural infection rates were similar in the first two species (20.6%; 19.1%) and slightly lower in t. nitida(13.8%). however there was no significant difference in the infection rates in the three species (p = 0.131). t. dimidiata males have higher infection rates than females (p = 0.030), whereas for r. prolixus there is no difference in infection rates between males and females (p = 0.114). the sex ratios for all three species were significantly skewed. more males than females were found inside houses for t. dimidiata (p < 0.0001) and t. nitida (p = 0.011); a different pattern was seen for r. prolixus (p = 0.037) where more females were found. sex ratio is proposed as an index to show the mobility of t. dimidiata in different populations. t. dimidiata is widely distributed in the country, and is also the main vector in at least ten departments, but r. prolixus with higher vectorial capacity is an important vector in at least two departments.
Evaluación económica de programas y servicios de salud
Mejía Mejía,Aurelio;
Revista Gerencia y Políticas de Salud , 2008,
Abstract: the gap between what medicine can do and what it is economically feasible to do makes more relevant the economic evaluation of health care programmes as a tool that makes explicit what otherwise would be implicit and informs decision makers about the health impact and resource use of different health programmes, which may offer society a better understanding of political process and resource allocation. this article shows the steps in an economic evaluation in health. also, some methodological issues are discussed.
Acción vaso-periférica del extracto acuoso de las hojas de Clusia coclensis (Clusiaceae)
García-González,Mildred;
Revista de Biología Tropical , 1998,
Abstract: aqueous leaf extract of clusia coclensis was applied at a dose of 40 mg/kg intravenously to isolated posterior extremities of six normotensive sprague-dawley rats and six spontaneously hipertensive rats anaesthetized with sodium nembutal. the perfusion was done in the abdominal artery using as carrier krebs bicarbonate ringer at 37 °c and keeping constant perfusion pressures of 100 mmhg in normotensive rats and 150 mmhg in hipertensive ratas. the venous return was measured in the inferior vena cava. the extract induced a significant reduction of the venous return begining 2 min after application, in both rat types. this may reflect a peripheral vasoconstriction that, in whole organism,would have an hipertensive effect. therefore, the mechanism of the alledgedly systemic hipotensive effect of the aqueous extract of clusia coclensis leafs resides probably at a central level, probably acting by a reduction of the contractibility of the myocardium.
Acción vaso-periférica del extracto acuoso de las hojas de Clusia coclensis (Clusiaceae)
Mildred García-González
Revista de Biología Tropical , 1998,
Abstract: Se inyectó extracto acuoso de hojas de Clusia coclensis en dosis de 40 mg/kg por vía endovenosa en el tren posterior aislado de 6 ratas normotensas (SDN) y 6 ratas hipertensas (SHR). El extracto provocó en ambas cepas de ratas una reducción significativa del retorno venoso. Se concluye que el extracto de Clusia provoca un efecto vasoconstrictor periférico, por lo que el efecto hipotensor y anti-hipertensivo encontrado anteriormente, podría ser atribuido a un efecto directo sobre el miocardio, mediante una disminución en la fuerza de la contracción cardíaca (efecto inotrópico negativo). Aqueous leaf extract of Clusia coclensis was applied at a dose of 40 mg/kg intravenously to isolated posterior extremities of six normotensive Sprague-Dawley rats and six Spontaneously Hipertensive rats anaesthetized with sodium nembutal. The perfusion was done in the abdominal artery using as carrier Krebs bicarbonate ringer at 37 °C and keeping constant perfusion pressures of 100 mmHg in normotensive rats and 150 mmHg in hipertensive ratas. The venous return was measured in the inferior vena cava. The extract induced a significant reduction of the venous return begining 2 min after application, in both rat types. This may reflect a peripheral vasoconstriction that, in whole organism,would have an hipertensive effect. Therefore, the mechanism of the alledgedly systemic hipotensive effect of the aqueous extract of Clusia coclensis leafs resides probably at a central level, probably acting by a reduction of the contractibility of the myocardium.
An Alternative Manifold for Cosmology Using Seifert Fibered and Hyperbolic Spaces  [PDF]
Maria E. Mejía, Reinaldo R. Rosa
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.56096
Abstract:

We propose a model with 3-dimensional spatial sections, constructed from hyperbolic cusp space glued to Seifert manifolds which are in this case homology spheres. The topological part of this research is based on Thurston’s conjecture which states that any 3-dimensional manifold has a canonical decomposition into parts, each of which has a particular geometric structure. In our case, each part is either a Seifert fibered or a cusp hyperbolic space. In our construction we remove tubular neighbourhoods of singular orbits in areas of Seifert fibered manifolds using a splice operation and replace each with a cusp hyperbolic space. We thus achieve elimination of all singularities, which appear in the standard-like cosmological models, replacing them by “a torus to infinity”. From this construction, we propose an alternative manifold for cosmology with finite volume and without Friedmann-like singularities. This manifold was used for calculating coupling constants. Obtaining in this way a theoretical explanation for fundamental forces is at least in the sense of the hierarchy.

CV3D – Reconstrucción tridimensional de imágenes tomográficas
Sergio Mejía,Juan Mejía
Iatreia , 2001,
Abstract: Las técnicas de reconstrucción tridimensional han ampliado el horizonte de las imágenes médicas al permitir la visualización de volúmenes en lugar de superficies de 2 dimensiones lo que permite encontrar relaciones anatómicas que facilitan los diagnósticos y mejoran los enfoques terapéuticos. Se desarrollará un programa en entorno MATLAB para la reconstrucción 3D de imágenes tomográficas digitales.
La investigación con células troncales humanas embrionarias y adultas: El nacimiento de la medicina regenerativa Perspectivas científicas, implicaciones epistemológicas y dilemas bioéticos
Mejía Rivera,Orlando;
Acta Medica Colombiana , 2007,
Abstract: research with stem cells is the most promising medical discovery for understanding and management of pathologies incurable so far. but besides that, it also announces the birth of regenerative medicine. this article analyses the state of the art with human embryonic and adult stem cells research, from the perspective of its revolutionary biological implications (questioning the classical embryology dogma of modern cardiology as well as the modern neurology dogma, epistemology (insufficient explanation of the mechanistic model of molecular biology) and its bioethical dilemma (moral statute of the embryo, creation of human - non - human and clinical research protocols).
La genética y la medicina predictiva: Implicaciones epistemológicas y consideraciones bioéticas
Mejía,Orlando;
Acta Medica Colombiana , 2005,
Abstract: el desarrollo de las pruebas diagnósticas genéticas, tanto de las enfermedades monogenéticas de aparición temprana como de las enfermedades de aparición tardía, y de las pruebas de predisposición, están generando una transformación epistemológica en la medicina contemporánea. pues se comienza a pasar de los modelos clásicos del diagnóstico clínico basado en lo anatomopatológico, lo fisiopatológico y lo etiopatogénico, a un nuevo paradigma diagnóstico que se puede denominar como el modelo genómico. en este trabajo se analizan los dilemas bioéticos y sociales de los distintos tipos de pruebas predictivas del diagnóstico genético.
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