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Search Results: 1 - 10 of 13427 matches for " Torres Ochoa "
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Evaluación de cambios cognitivos de conceptos de Ecología, en estudiantes de nivel secundaria en México
Torres Ochoa, Sergio Rodolfo;
Revista electrónica de investigación educativa , 2008,
Abstract: this study was made from a random sample of students of secondary school (basic education), in urban an rural schools of the public sector of the state of michoacán, mexico. significant cognitive changes of basic concepts of ecology, during the whole academic year were assessed in each one of the three grades which conform this level of education. for such purpose, a group of six fundamental and four complementary concepts was used with which a core concept diagram was elaborated. from this diagram, a 23 task questionnaire was designed and applied as conceptual assessment instrument. the general results show that there are no significant differences, statistically speaking, between the beginning and the end of the academic year, regarding the principal ecology concepts and other related concepts that were assessed as well. this study included an interpretative phase based in conceptual maps, which results are not included in this article.
Valor de la determinación de anticuerpos antitiroideos plasmáticos para el diagnóstico de tiroiditis crónica autoinmune
Ochoa Torres,Francisco; Ruiz Hernández,Luis;
Revista Cubana de Endocrinolog?-a , 2001,
Abstract: the effectiveness of the humoral antibody detection methods used in the diagnosis of chronic autoimmune thyroiditis (cat) in the national institute of endocrinology was assessed. a group of 100 patients with goitier and presenting with clinical suspicion of cat was studied. a fine needle biopsy was performed on each of the patients, which was taken as the golden rule of the diagnosis and also the determination of plasmatic antithyroglobulin antibodies by the tcr method and the determination of antimicrosomal antibodies were made for statistically validating both methods, taking sensitivity, specificity, predictive value for positive cases, predictive value for negative cases and general index of diagnostic efficacy into consideration. seventy patients were found positive and 30 negative for cat by the fnb. the sensitivity of both methods of humoral antibodies was poor: 45.7 % for ams and 30 % for trc. even the joint application of both methods to the same patient did not exceed 60 %. specificity was a much better indicator in both methods (73.3 % for ams, 90 % for trc and 70 % for both applied together). the predictive value for positive cases was good (80 % for ams; 87.5 % for trc and 82.3 % for both) and the predictive value for negative cases was 36.3, 35.5 and 42.9 % respectively. the general efficacy was only 54 % for trc, 48 % for ams and 63 % for both methods together. it was concluded that these procedures are useful to confirm the diagnosis when cases are positive, but they are rather useless to assure the non-existence of this affection when cases are negative
Biopsia por punción con aguja fina sin aspiración en el diagnóstico prequirúrgico del nódulo del tiroides
Ochoa Torres,Francisco; Gil León,Rebeca;
Revista Cubana de Endocrinolog?-a , 2001,
Abstract: a group of 100 patients operated on of thyroid nodule at the service of general surgery of “comandante manuel fajardo” hospital was studied aimed at validating the method of biopsy by fine needle puncture without aspiration (cytopuncture) in the presurgical diagnosis of this disease. every patient underwent cytopuncture with needle no. 25 before the operation. the results were classified into negative (benign) and positive (malignant and suspected), and postoperative histology into benign and malignant, according to the interests of our investigation and to the criteria preestablished at the department of pathological anatomy of the hospital. 100 % of the samples were useful for the diagnosis with a correspondence between cytopuncture and histology of 83 %. the values of the indicators of validation were: sensitivity, 76 %; specificity, 85 %; positive predictive value, 57 %, negative predictive value, 93 %; and general efficiency of the method, 85 %. it was concluded that cytopuncture is a useful diagnostic method in the unique thyroid nodule and that it has the same results as the fine needle biopsy, but the first one is more recommendable because its application is easier and it is less traumatic and more economic.
Valor de la determinación de anticuerpos antitiroideos plasmáticos para el diagnóstico de tiroiditis crónica autoinmune Value of the determination of plasmatic antithyroid antibodies for the diagnosis of chronic autoimmune thyroiditis
Francisco Ochoa Torres,Luis Ruiz Hernández
Revista Cubana de Endocrinología , 2001,
Abstract: Se valoró la eficacia de los métodos de detección de anticuerpos humorales empleados en el Instituto Nacional de Endocrinología para el diagnóstico de TCA. Se estudió un grupo de 100 pacientes con bocio y la sospecha clínica de que padecieran de TCA. A cada uno se le realizó una biopsia con aguja fina (BAF), que se tomó como la regla de oro del diagnóstico, determinación de anticuerpos plasmáticos antitiroglobulina por el método del TRC y antimicrosomales (AMS), para hacer una validación estadística de ambos métodos; sensibilidad, especificidad, valor predictivo para casos positivos, valor predictivo para casos negativos y el índice general de eficacia diagnóstica. Se hallaron 70 pacientes con resultados positivos de TCA por la BAF y 30, negativos. La sensibilidad de ambos métodos de detección de anticuerpos humorales fue pobre (45,7 % para el AMS y 30 % para el TRC). Aún aplicados los dos al mismo paciente no sobrepasó del 60 %. La especificidad fue mucho mejor para ambos métodos (73,3 % para la AMS, 90 % para el TRC y 70 % para ambos métodos juntos). El valor predictivo para casos positivos fue bueno (80 % para AMS, 87,5 % para TRC y 82,3 % para los métodos de conjunto) y el predictivo para casos negativos fue 36,3, 35,5 y 42,9 %, respectivamente. La eficacia general fue tan solo del 54 % para el TRC, 48 % para AMS y 63 % para ambos métodos de conjunto. Se concluyó que estos métodos son útiles para reafirmar el diagnóstico cuando resultan positivos, pero de poca utilidad para asegurar que no se trata de esta afección cuando resultan negativos The effectiveness of the humoral antibody detection methods used in the diagnosis of chronic autoimmune thyroiditis (CAT) in the National Institute of Endocrinology was assessed. A group of 100 patients with goitier and presenting with clinical suspicion of CAT was studied. A fine needle biopsy was performed on each of the patients, which was taken as the golden rule of the diagnosis and also the determination of plasmatic antithyroglobulin antibodies by the TCR method and the determination of antimicrosomal antibodies were made for statistically validating both methods, taking sensitivity, specificity, predictive value for positive cases, predictive value for negative cases and general index of diagnostic efficacy into consideration. Seventy patients were found positive and 30 negative for CAT by the FNB. The sensitivity of both methods of humoral antibodies was poor: 45.7 % for AMS and 30 % for TRC. Even the joint application of both methods to the same patient did not exceed 60 %. Specificity was a much better
Biopsia por punción con aguja fina sin aspiración en el diagnóstico prequirúrgico del nódulo del tiroides Fine needle biopsy without aspiration in the presurgical diagnosis of thyroid nodule
Francisco Ochoa Torres,Rebeca Gil León
Revista Cubana de Endocrinología , 2001,
Abstract: Se estudió un grupo de 100 pacientes operados de nódulo único del tiroides en el Servicio de Cirugía General del Hospital “Cmdte. Manuel Fajardo”, para validar el método de la biopsia por punción con aguja fina sin aspiración (citopunción) en el diagnóstico prequirúrgico de esa afección. A cada paciente se le realizó una citopunción con aguja No. 25 antes de la intervención quirúrgica; los resultados se clasificaron en negativos (benignos) y positivos (malignos y sospechosos) y la histología posoperatoria, en benigna y maligna, según los intereses de nuestro trabajo y de criterios preestablecidos en el Departamento de Anatomía Patológica del hospital. El 100 % de las muestras fue útil para diagnóstico con una correspondencia entre citopunción e histología del 83 %. Los valores de los indicadores de validación fueron: sensibilidad: 76 %, especificidad: 85 %, valor predictivo positivo: 57 %, valor predictivo negativo: 93 % y eficacia general del método: 85 %. Concluimos que la citopunción es un método diagnóstico útil en el nódulo único del tiroides y que logra iguales resultados que la BAF, pero la primera es más recomendable por ser de más fácil aplicación, menos traumático y más económico. A group of 100 patients operated on of thyroid nodule at the Service of General Surgery of “Comandante Manuel Fajardo” Hospital was studied aimed at validating the method of biopsy by fine needle puncture without aspiration (cytopuncture) in the presurgical diagnosis of this disease. Every patient underwent cytopuncture with needle No. 25 before the operation. The results were classified into negative (benign) and positive (malignant and suspected), and postoperative histology into benign and malignant, according to the interests of our investigation and to the criteria preestablished at the Department of Pathological Anatomy of the hospital. 100 % of the samples were useful for the diagnosis with a correspondence between cytopuncture and histology of 83 %. The values of the indicators of validation were: sensitivity, 76 %; specificity, 85 %; positive predictive value, 57 %, negative predictive value, 93 %; and general efficiency of the method, 85 %. It was concluded that cytopuncture is a useful diagnostic method in the unique thyroid nodule and that it has the same results as the fine needle biopsy, but the first one is more recommendable because its application is easier and it is less traumatic and more economic.
Effect of magnesium on the aluminothermic reduction rate of zinc oxide obtained from spent alkaline battery anodes for the preparation of Al–Zn–Mg alloys
Rocio Ochoa,Alfredo Flores,Jesus Torres
- , 2016, DOI: https://doi.org/10.1007/s12613-016-1256-6
Abstract: The aluminothermic reduction of zinc oxide (ZnO) from alkaline battery anodes using molten Al may be a good option for the elaboration of secondary 7000-series alloys. This process is affected by the initial content of Mg within molten Al, which decreases the surface tension of the molten metal and conversely increases the wettability of ZnO particles. The effect of initial Mg concentration on the aluminothermic reduction rate of ZnO was analyzed at the following values: 0.90wt%, 1.20wt%, 4.00t%, 4.25wt%, and 4.40wt%. The ZnO particles were incorporated by mechanical agitation using a graphite paddle inside a bath of molten Al maintained at a constant temperature of 1123 K and at a constant agitation speed of 250 r/min, the treatment time was 240 min and the ZnO particle size was 450-500 mesh. The results show an increase in Zn concentration in the prepared alloys up to 5.43wt% for the highest initial concentration of Mg. The reaction products obtained were characterized by scanning electron microscopy and X-ray diffraction, and the efficiency of the reaction was measured on the basis of the different concentrations of Mg studied.
Análisis de las causas del insuficiente número de publicaciones nacionales en la revista VacciMonitor
Ochoa Torres,Rolando José; Palacios Sánchez,Karina; Felipe Ochoa Azze,Rolando;
ACIMED , 2010,
Abstract: vaccimonitor is a scientific journal specialized in vaccines, belonging to "finlay ediciones", unique with those characteristics in latin america. however, there are few articles published by cuban researchers, which restrict the achievements spreading that in that sector of the science our country has obtained. therefore, we propose to identify the reasons by which the national researchers do not publish in it, by means of written questionnaires applied to 40 researchers of scientific and health centers selected in four provinces. vaccimonitor, the leading product of "finlay ediciones", has wide potentialities, and it is indexed in numerous international databases, it must reach the most important ones in this field to make it more attractive between the researchers. the journal's virtues are little known in the national academic field, main reason for which the national researchers do not publish, neither they are motivated for it.
Análisis de las causas del insuficiente número de publicaciones nacionales en la revista VacciMonitor Analysis of causes of the insufficient number of national publications in VacciMonitor journal
Rolando José Ochoa Torres,Karina Palacios Sánchez,Rolando Felipe Ochoa Azze
ACIMED , 2010,
Abstract: VacciMonitor es una revista científica especializada en vacunas, perteneciente a "Finlay Ediciones", única con esas características en Latinoamérica. Sin embargo, son pocos los artículos publicados por investigadores cubanos, lo que limita la difusión de los logros que en ese sector de la ciencia ha alcanzado Cuba. Se propuso, por tanto, identificar los motivos por los cuales los investigadores nacionales no publican en ella, mediante encuestas escritas en 40 investigadores de centros científicos y de salud seleccionados en cuatro provincias. VacciMonitor, producto líder de "Finlay Ediciones", tiene amplias potencialidades, y si bien está indexada en numerosas bases de datos internacionales, debe alcanzar las más importantes en este campo para hacerla más atractiva entre los investigadores. Las virtudes de la revista son poco conocidas en el ámbito académico nacional, principal causa por la cual los investigadores nacionales no publican, y tampoco están motivados para esto. VacciMonitor is a scientific journal specialized in vaccines, belonging to "Finlay Ediciones", unique with those characteristics in Latin America. However, there are few articles published by Cuban researchers, which restrict the achievements spreading that in that sector of the science our country has obtained. Therefore, we propose to identify the reasons by which the national researchers do not publish in it, by means of written questionnaires applied to 40 researchers of scientific and health centers selected in four provinces. VacciMonitor, the leading product of "Finlay Ediciones", has wide potentialities, and it is indexed in numerous international databases, it must reach the most important ones in this field to make it more attractive between the researchers. The journal's virtues are little known in the national academic field, main reason for which the national researchers do not publish, neither they are motivated for it.
Intervención docente y aprendizaje en asignaturas fundamentales de la Enfermería
Marín Laredo,Ma. Martha; Torres Ochoa,Sergio R;
Humanidades M??dicas , 2008,
Abstract: the present work arises from the worry based on the experience in the labor field of the sector health and, mainly, in the one acquired in the educational environment, where weaknesses were detected in the educational intervention and learning relationship, of teachers and students, in nursery procedures - assistance and preventive - in the career of degree in nursery in the michoacan university of san nicolas of hidalgo (musnh), mexico. the above-mentioned has been observed especially in the 1o and 2o level of attention, in the institutions of health, where the students have to apply the acquired skills during their formations. for such a reason, the necessity arose of evaluating the students' learning process of the subjects "basic elements of nursery" and "nursery in public health" that are being studied in the 2o. semester of the career and that are fundamental in the formation of both nurses and male nurses. this way, the character that acquires the educational intervention during the process of the nursery students' learning was evaluated. the quantitative and qualitative results are constituted in reflection elements and analysis to impact in changes in the educational intervention, because it is a systematized reflection of what happens in the process of formation of the nursery career.
PRODUCTS OF LF-TOPOLOGIES AND SEPARATION IN LF-TOP
Ochoa C,Carlos Orlando; Luna - Torres,Joaquín;
Proyecciones (Antofagasta) , 2009, DOI: 10.4067/S0716-09172009000200007
Abstract: for a gl-monoid l provided with an uniform structure, we build an lf-topology on the cartesian product of a family of lf-topological spaces. we also show that the product of an arbitrary family of kolmogoroff (hausdorff) lf-topological spaces is again a kolmogoroff (hausdorff) lf-topological space.
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