Objetivos: definir los patrones de práctica clínica de la vida real en la terapia de mantenimiento en MM en Colombia y las diferencias con la región (Latinoamérica). Materiales y métodos: se realizó una encuesta a hematólogos colombianos y latinoamericanos la cual fue contestada por la plataforma Surveymonkey, recogiéndose los resultados en tiempo real mediante el sistema informático.
Changes in soil structure can be monitored in undisturbed soil samples through the micromorphometric analysis of thin sections. In this methodology, it is common that individual images (three to ten repetitions) are used and that they cannot be related in different scales between soil components; in addition, although a minimum study area is established, its representativeness in the soil components is unknown. The objective of this study was to quantify the soil constituent (pores, aggregates, and roots) and to compare the values obtained from individual images versus high-resolution mosaics from a complete thin section. Unaltered samples were collected in three soils with different clay contents (Entisols, Inceptisols, and Vertisols) and presence of maize roots in the same phenological development stage (physiological maturity). Three thin sections of each soil (5 × 7 cm × 30 μm 1865 mm 2) were prepared and sequential images of 11.1× 7.4 mm (63 in total) were obtained at 2× magnification using a petrographic microscope and plane polarized light (PPL). The high-resolution mosaics (2.6 µm píxel-1) at a colour depth 24 bits (8 bits × 3 bands in standard RGB) were built using space operators; subsequently, three, five and ten images were randomly selected. The individual images and the mosaics were transformed by principal component analysis in ArcGis® and soil constituents were delimited according to their variances values. The results indicate that individual images are recommended only to quantify porosity or in homogeneous systems in structure and color, but not in heterogeneous systems where the data obtained show high variability. Even when the results are similar to those calculated in the mosaics, the dispersion of the data is high (variance 5 times greater than the mean) and with little representation. In contrast, high-resolution mosaics offer the total quantification of the thin section and soil components can be grouped into classes or categories to observe intra or inter relations in the soil system. In addition, the soil components can be related to different scales, for example macroaggregates and roots.
El trabajo de la historiadora y archivista Victoria San Vicente Tello ha sido pilar no sólo para conocer el proceso de conformación del Centro de Información Gráfica en el Archivo General de la Nación, sino para comprender la evolución de esta dependencia desde los ochentas hasta nuestros días. Gracias a su capacidad organizativa logró conjuntar su pasión por la historia con la archivística. Su trabajo contribuyó a capacitar y profesionalizar al personal del AGN, en tanto se elaboraba la Guía General del Archivo General de la Nación, instrumento de consulta básica, donde logró unir esfuerzos para preservar la memoria documental del país.
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