Genetic potential of S1 lines derived from native maize populations of Tamaulipas, Mexico

This study is designed to evaluate and select the best S1 maize top cross lines to continue their process of inbreeding. Nineteen top crosses samples were examined from three contrasting environments (two places from Tamaulipas and one place from the Central High Valleys of Mexico) during 2008. These S1 lines were derived from native populations of four ecological zones of Tamaulipas; one tester from the High Valleys was used. Some top crosses had high yield as well as favorable agronomic traits, though these varied between environments. Some had better performance in Northern Tamaulipas, mainly the tropical groups 1 and 2 that are from hot and dry climates. In the High Valleys these groups had lower yields compared with the top crosses groups 3 and 4. Group 1, the top cross of I-C3001-2915-2 with high yield in the Central and Northern Tamaulipas environments (2.4 and 5.8 t ha-1, respectively) was outstanding. In the High Valleys, the top crosses from group 3 (from the Tamaulipas Huasteca, a hot, and humid climate zone) had yields of 7.4 to 8.5 t ha-1 and from group 4, the top cross of IV-C4031-2939-5(C) yielded 8.8 t ha-1. The S1 lines being evaluated show potential for those top crosses with better grain yield and earliness, indicating good combining ability. It has been suggested that the S1 lines are better to continue the inbreeding process, planning test crosses and field assessments in the environments where they had better performance

Characterization of Cardiopulmonary Interactions and Exploring Their Prognostic Value in Acute Bronchiolitis: A Prospective Cardiopulmonary Ultrasound Study

We aimed to delineate cardiopulmonary interactions in acute bronchiolitis and to evaluate the capacity of a combined cardiopulmonary ultrasonography to predict the need for respiratory support. This was a prospective observational single-center study that includes infants <12 month of age admitted to a hospital due to acute bronchiolitis. All the included patients underwent clinical, laboratory and cardiopulmonary ultrasonographic evaluation at the same time point within 24 h of hospital admission. The existence of significant correlation between cardiac and respiratory parameters was the primary outcome. The association of different cardiopulmonary variables with the need of respiratory support higher than O2, the length of stay hospitalization, the PICU stay and the duration of respiratory support were a secondary outcome. We enrolled 112 infants (median age 1 (0.5–3) months; 62% males) hospitalized with acute bronchiolitis. Increased values of the pulmonary variables (BROSJOD score, pCO2 and LUS) showed moderate correlations with NT-proBNP and all echocardiographic parameters indicative of pulmonary hypertension and myocardial dysfunction (Tei index). Up to 36 (32%) infants required respiratory support during the hospitalization. This group presented with higher lung ultrasound score (p < 0.001) and increased values of NT-proBNP (p < 0.001), the Tei index (p < 0.001) and pulmonary artery pressures (p < 0.001). All the analyzed respiratory and cardiac variables showed moderate-to-strong correlations with the LOS of hospitalization and the time of respiratory support. Lung ultrasound and echocardiography showed a moderate-to-strong predictive accuracy for the need of respiratory support in the ROC analysis, with the AUC varying from 0.74 to 0.87. Those cases of bronchiolitis with a worse pulmonary status presented with a more impaired cardiac status. Cardiopulmonary ultrasonography could be a useful tool to easily identify high-risk populations for complicated acute bronchiolitis hospitalization

Paradoxical behavior of the QT interval during exercise and recovery and its relationship with cardiac memory

Background: Few studies have dealt with the behavior of the corrected (QTc) and uncorrected QT intervals during exercise and recovery.Hypothesis: Based on previously published dynamics of the QT interval during treadmill testing, this study attempted to reevaluate the computer‐proposed underlying mechanisms of these dynamics and to determine whether the so‐called memory phenomenon could be operative in some subjects without evidence of structural heart disease.Methods: This study included 42 unmedicated healthcare volunteers, 23 men and 19 women aged between 20 and 42 (mean 31.7) years. All had normal physical examinations, x‐rays, and transthoracic echocardiograms. The electrocardiograms were also normal with 12‐lead QT interval dispersions of <90ms.Results: During exercise and recovery, the behavior of the QT intervals permitted the categorization into two groups. In Group 1 (31/42; 73.8% of subjects) the uncorrected QT interval showed a biphasic pattern consisting of a gradual decrease during incremental exercise followed by a gradual increase during recovery. In contrast, the QTcinterval had a triphasic pattern resulting from a slight increase during the early phase of exercise, a gradual decrease at the highest rates, and a final increase during recovery as the rate slowed to control values. In Group 2 (11/42; 36.2% of subjects) the behavior was considered as paradoxical since the uncorrected QT interval displayed in a triphasic pattern whereas the QTcinterval yielded a tetraphasic pattern due to the fact that both showed a second decrease during recovery while the rate was decreasing.Conclusions: Analysis of dynamics behavior of the QTcand the uncorrected QT intervals during exercise showed that some normal subjects had a paradoxical behavior which, because of its temporal relation to the phases of exercise, could be an expression of the so‐called memory phenomenon

Tecnología cliente servidor con arquitectura CORBA : simulación del proceso de comercialización agrícola

Corba es una nueva arquitectura para el desarrollo de sistemas distribuidos. En este trabajo se ha elaborado un sistema de comercialización de productos agropecuarios, el mismo que implementa un mecanismo de negociacion que se realiza en la bolsa nacional de productos. Se encontraron e implementaron tres subsistemas bien definidos a saber: menbresía de corredor, de producto, negociación de producto. Uno de los objetivos es demostrar la funcionabilidad y practicidad del uso de internet como medio de transmisión de información en aplicaciones que requieran cobertura a gran escala.GuayaquilIngeniero en Computació

Clínica Integrada - ME210 - 202101

Curso de especialidad, de la carrera de medicina, de carácter teórico- práctico del ciclo 7, en el que los estudiantes integran conocimientos previos con la anamnesis, el examen físico y establecen el diagnostico por síndromes o problemas y el plan de trabajo. El curso de Clínica integrada busca desarrollar las competencias generales de comunicación escrita y comunicación oral(nivel 2) y las competencias específicas de práctica clínica-diagnóstico (nivel 2) y profesionalismo-sentido ético y legal y responsabilidad profesional(nivel 2). La integración de conocimientos en la historia clínica, permitirá al estudiante, plantear un adecuado diagnóstico, plan de trabajo para la atención de su futuro paciente