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Tomando como referencia un viscosímetro de Ubbelohde se diseñó y construyó una celda para la medida conjunta de la viscosidad y la densidad, por el método de flotación magnética, de una solución. En esta celda se pueden generar soluciones de concentraciones diferentes mediante la dilución de una solución concentrada.

OBJETIVO: Evaluar el impacto de un modelo de Mejoramiento Continuo de la Atención Prenatal sobre la morbilidad materna y la morbimortalidad Perinatal. DISEÑO: Estudio prospectivo descriptivo. MATERIALES Y METODOS: Entre Enero de 1997 y Mayo de 1998, se evaluó la calidad de la atención ofrecida a las pacientes que asistieron a control prenatal en el Centro de Atención Ambulatoria del Instituto de Seguros Sociales (CAA - ISS) y el Centro de Salud Suroccidente del Servicio de Salud del Cauca (CSS -SS) de la ciudad de Popayán. Después de un período de observación de cinco meses, la intervención, realizada en los doce meses siguientes, consistió en la aplicación de un modelo de control de calidad, utilizando un formato diseñado para evaluar el correcto diligenciamiento de 92 variables de la Historia Clínica Perinatal, que permitía además la supervisión y la asesoría continua del personal que realizaba el control. Se analizó el diligenciamiento de 22.292 variables que correspondieron a una muestra del 5.7% de los controles prenatales realizados en ambas Instituciones. El impacto de la intervención se evaluó en los resultados de 1.217 eventos obstétricos ocurridos durante el período del estudio. RESULTADOS: El diligenciamiento correcto de todas las variables se logró incrementar de un 65% a un 92.2% en el CAA - ISS y del 84.5% al 90.8% en el CSS - SS. El mayor impacto de la intervención se evidenció en las tasas de mortalidad perinatal que disminuyeron de 24.3 a 13.0 en el CAA - ISS y de 12.7 a 0 en el CSS - SS, con coeficientes de correlación lineal estadísticamente significativos especialmente en el Seguro Social. CONCLUSIONES: El buen diligenciamiento de la historia clínica, la aplicación de un instrumento de control de calidad y la supervisión conducen al mejoramiento de los resultados perinatales.

Abstract The ability of an individual to withstand random perturbations during its development is considered a good indicator of environmental and genetic stress. A common means of assessing developmental stability is through analysis of fluctuating asymmetry (FA) in bilateral traits. Tortoises, with their large, solid plastron, allow for measurement of body geometry. Their bilateral shell scutes are ideal candidates for asymmetries researches. With this issue in mind we assessed, as a preliminary study, levels of plastron scute asymmetry in a sample of 46 red-footed tortoise Chelonoidis carbonaria from Arauca, N Colombia. We found significative fluctuating asymmetry (FA) but no directional asymmetry, the former not increasing with carapace size and thus indicating that tortoise shells do not become increasingly asymmetrical with age, or in other words, signaling that FA is not being influenced by pholidosis (variability of scale cover mosaic according to the development of the scutes). Asymmetry in plastron shape, although not necessarily apparent at first glance, varied, with gender with males exhibiting higher levels of FA than females. Although we can not identify the potential sources of variation responsible for the observed patterns of developmental instability, we consider this detected form of asymmetry due to unfavorable environmental conditions.

Desde las últim as décadas, es evidente la preocupación m undial por los im pactos ambientales negativos que ponen en riesgo la sostenibilidad urbana y su calidad ambiental. Diferentes estudios exponen las variables más importantes para minim izar estos impactos ambientales, y en este sentido, este trabajo de investigación muestra cómo a partir de un diseño metodológico más sencillo con 27 variables am bientales estratégicas, es posible evaluar la tendencia am biental urbana de ciudades intermedias. Este grupo priorizado de variables trabajadas en el marco de una gestión compartida, orientará el desarrollo de la ciudad hacia una estructura territorial más sostenible, como reto para la planificación ambiental actual y con visión de futuro.

Una bentonita procedente del Valle del Cauca se caractarizó mediante análisis físico, fisicoquímico, mineralógico y químico. Los resultados obtenidos indican que este mineral es de tipo montmorilloníiico. Esta bentonita se trató con cloruro de alquilbencildimetilamonio para producir una arcilla organofilica, compuesto que tiene propiedades tixotrópicas de amplia aplicación en diferentes campos de la industria. Para obtener la arcilla organofilica se empicaron tres métodos diferentes. Tomando como referencia la viscosidad de suspensiones de los compuestos preparados y de los patrones en mezclas de acetato de etilo y N,N- dimetilformamida, se hizo un estudio estadistico para comparar los métodos entre sí y la calidad de la arcilla organofilica obtenida con la de productos importados, tales como: Pcrchem 44. Perchem 108 y Bentogcn N. Este estudio permitió concluir que no existe diferencia significativa entre los métodos empleados. Igualmente se encontró que las suspensiones de las muestras obtenidas presentan valores superiores de viscosidad que las de las muestras comerciales.

Se midieron las densidades a 25,000 ± 0,006°C de soluciones acuosas diluidas de los yoduros de bencil trimetll amonio y dimetil dibencil amonio, e mpleando un densímetro de flotación magnética. Se calcularon los volúmenes molares aparentes 0v S^ obtuvieron volúmenes molares parciales a dilución infinita, extrapolando los valores de 0 ^ mediante la ecuación de Redlich y Meyer yj—°y + S^y^c-Fb^c,sin el término bvc. El cambio progresivo de un grupo metilo por un grupo bencilo en el yoduro de tetrametll amonio produce un incremento en el volumen parcial molar a dilución infinita de 64,4 ml/mol para las sales estudiadas.

Competing Interests: Declaration of Conflicting InterestsThe author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

A calcifying fibrous tumor (CFT), also known as calcifying fibrous pseudotumor, is an uncommon non-cancerous neoplasm usually located in the gastrointestinal tract. Its location in the lung is extremely rare, and only a few case reports have been published. This case report describes our diagnostic approach in a 9-year-old male patient with an incidental pulmonary mass. The mass was initially misdiagnosed, requiring multiple imaging tests and interventions to obtain the definitive diagnosis of pulmonary CFT. This paper aims to contribute to the limited information available on pulmonary CFT by presenting detailed findings from computed tomography and magnetic resonance imaging., Competing Interests: Human subjects: Consent was obtained or waived by all participants in this study. Conflicts of interest: In compliance with the ICMJE uniform disclosure form, all authors declare the following: Payment/services info: All authors have declared that no financial support was received from any organization for the submitted work. Financial relationships: All authors have declared that they have no financial relationships at present or within the previous three years with any organizations that might have an interest in the submitted work. Other relationships: All authors have declared that there are no other relationships or activities that could appear to have influenced the submitted work., (Copyright © 2024, Herrera Ortiz et al.)

Introduction: The asbestos industry began operations in Colombia in 1942, with an asbestos-cement facility located in the municipality of Sibaté. In recent years residents from Sibaté have been complaining about what they consider is an unusually large number of people diagnosed with asbestos-related diseases in the town. A study to analyze the situation of Sibaté started in 2015, to verify if the number of asbestos related diseases being diagnosed were higher than expected, and to identify potential asbestos exposure sources in the town., Methods: A health and socioeconomic survey was implemented door-to-door to identify potential asbestos-related diseases. Several self-reported mesothelioma cases were identified, and for confirmation purposes, copies of the medical record with the histopathology report were obtained. A panel of six physicians analyzed the medical records. Information of validated cases was used to estimate the male and female age-adjusted incidence rate for Sibaté. Based on reports of the existence of potential asbestos-contaminated landfills, topographic maps, a digital elevation model, and current satellite images were crossed using a geographic information system to identify potential landfilled areas, and soils samples were collected in some of these areas., Results: A total of 355 surveys were completed, and 29 self-reported mesothelioma cases were identified. Twenty-five of these cases have been persons who had lived at some moment of their lives in Sibaté. It was possible to obtain copies of the medical diagnosis for 17 cases. Of these, the panel of physicians classified 15 cases as certain pleural mesothelioma, one as probable, and one as not mesothelioma. Based on this information, the estimated age-adjusted incidence rate of mesothelioma in Sibaté was 3.1 × 10 5 persons-year for males and 1.6 × 10 5 persons-year for females. These rates are high in comparison to those reported in other cities, regions, and countries of the world. Using geographic information systems, landfilled zones in the urban area of Sibaté were identified, on top of which a school and different sports facilities were built. The analysis of four soil samples collected in landfilled zones, confirmed the existence of an underground layer of friable and non-friable asbestos., Conclusion: The collected evidence suggests the presence of a malignant pleural mesothelioma cluster in Sibaté., (Copyright © 2019. Published by Elsevier Inc.)