453 research outputs found
Alternativa de analisis teorico a la propuesta de lawrence kohlberg del desarrollo moral
Este documento presenta un análisis conceptual a partir de tres concepciones éticas. En primer lugar la teoría del desarrollo moral de Kohlberg y su concepción evolucionista de la moral, en segundo lugar y desde la perspectiva filosófica se analizan los conceptos de autores como Ernst Tugendhat, con el concepto de comunidad moral junto con la perspectiva del autor Alasdair MacIntyre. Como una tercera alternativa al concepto moral Kohlberiano se presenta la ética del cuidado propuesta por Carol Gilligan que resalta la necesidad básica del apego y la vivencias de relaciones seguras para el desarrollo socioafectivo. Finalmente, se presenta la ética del cuidado articulada dentro de una propuesta pedagógica.This document presents a conceptual analysis based on three ethical concepts. First, the theory of moral development by Kohlberg and his evolutionary conception of morality, second, and from a philosophical perspective, the concepts from authors such as Ernst Tugendhat, (moral community concept) and the perspective from Alasdair MacIntyre are analyzed. As a third alternative to the Kohlberian moral concept it is presented the ethic of care as proposed by Carol Gilligan that emphasizes the basic need of attachment and secure relationships experiences for the social and emotional development. Finaly, it´s present the ethics of care articulated within a pedagogical approac
The Mean and Scatter of the Velocity Dispersion-Optical Richness Relation for maxBCG Galaxy Clusters
The distribution of galaxies in position and velocity around the centers of
galaxy clusters encodes important information about cluster mass and structure.
Using the maxBCG galaxy cluster catalog identified from imaging data obtained
in the Sloan Digital Sky Survey, we study the BCG-galaxy velocity correlation
function. By modeling its non-Gaussianity, we measure the mean and scatter in
velocity dispersion at fixed richness. The mean velocity dispersion increases
from 202+/-10 km/s for small groups to more than 854+/-102 km/s for large
clusters. We show the scatter to be at most 40.5+/-3.5%, declining to
14.9+/-9.4% in the richest bins. We test our methods in the C4 cluster catalog,
a spectroscopic cluster catalog produced from the Sloan Digital Sky Survey DR2
spectroscopic sample, and in mock galaxy catalogs constructed from N-body
simulations. Our methods are robust, measuring the scatter to well within
one-sigma of the true value, and the mean to within 10%, in the mock catalogs.
By convolving the scatter in velocity dispersion at fixed richness with the
observed richness space density function, we measure the velocity dispersion
function of the maxBCG galaxy clusters. Although velocity dispersion and
richness do not form a true mass-observable relation, the relationship between
velocity dispersion and mass is theoretically well characterized and has low
scatter. Thus our results provide a key link between theory and observations up
to the velocity bias between dark matter and galaxies.Comment: 25 pages, 15 figures, 2 tables, published in Ap
Multidrug-Resistant Mycobacterium tuberculosis, Southwestern Colombia
Using spoligotyping, we identified 13 genotypes and 17 orphan types among 160 Mycobacterium tuberculosis isolates from patients in Valle del Cauca, Colombia. The Beijing genotype represented 15.6% of the isolates and was correlated with multidrug-resistant tuberculosis, female sex of the patients, and residence in Buenaventura and may represent a new public health threat
Impact of Systematics on SZ-Optical Scaling Relations
One of the central goals of multi-wavelength galaxy cluster cosmology is to
unite all cluster observables to form a consistent understanding of cluster
mass. Here, we study the impact of systematic effects from optical cluster
catalogs on stacked SZ signals. We show that the optically predicted
Y-decrement can vary by as much as 50% based on the current 2 sigma systematic
uncertainties in the observed mass-richness relationship. Mis-centering and
impurities will suppress the SZ signal compared to expectations for a clean and
perfectly centered optical sample, but to a lesser degree. We show that the
level of these variations and suppression is dependent on the amount of
systematics in the optical cluster catalogs. We also study X-ray
luminosity-dependent sub-sampling of the optical catalog and find that it
creates Malmquist bias increasing the observed Y-decrement of the stacked
signal. We show that the current Planck measurements of the Y-decrement around
SDSS optical clusters and their X-ray counterparts are consistent with
expectations after accounting for the 1 sigma optical systematic uncertainties
using the Johnston mass richness relation.Comment: 6 pages, 4 figures. Revised to match version accepted in the
Astrophysical Journa
Orientation of Pterin-6-Carboxylic Acid on Gold Capped Silicon Nanopillars Platforms: Surface Enhanced Raman Spectroscopy and Density Functional Theory Studies
The orientation of pterin-6-carboxylic acid on gold nanopillars was investigated by surface enhanced Raman spectroscopy and density functional theory methods. The experimentally vibrations from pterin-6-COOH free and attached to the Au surface display vibration features indicating chemical interaction of the pterin with the metal surface. The spectral feature evidenced that the pterin would adsorb on gold surface with a "lying down" configuration through the high intensity vibration of NH scissoring and rocking OH modes. The orientation study of pterins on gold nanopillars presented herein is believed to lead to new applications in biosensing field for detecting pterins of physiological importance
Measuring the mean and scatter of the X-ray luminosity -- optical richness relation for maxBCG galaxy clusters
Determining the scaling relations between galaxy cluster observables requires
large samples of uniformly observed clusters. We measure the mean X-ray
luminosity--optical richness (L_X--N_200) relation for an approximately
volume-limited sample of more than 17,000 optically-selected clusters from the
maxBCG catalog spanning the redshift range 0.1<z<0.3. By stacking the X-ray
emission from many clusters using ROSAT All-Sky Survey data, we are able to
measure mean X-ray luminosities to ~10% (including systematic errors) for
clusters in nine independent optical richness bins. In addition, we are able to
crudely measure individual X-ray emission from ~800 of the richest clusters.
Assuming a log-normal form for the scatter in the L_X--N_200 relation, we
measure \sigma_\ln{L}=0.86+/-0.03 at fixed N_200. This scatter is large enough
to significantly bias the mean stacked relation. The corrected median relation
can be parameterized by L_X = (e^\alpha)(N_200/40)^\beta 10^42 h^-2 ergs/s,
where \alpha = 3.57+/-0.08 and \beta = 1.82+/-0.05. We find that X-ray selected
clusters are significantly brighter than optically-selected clusters at a given
optical richness. This selection bias explains the apparently X-ray
underluminous nature of optically-selected cluster catalogs.Comment: 21 pages, 12 figures, revised after referee's comments. ApJ accepte
CNVs in the 22q11.2 chromosomal region should be an early suspect in infants with congenital cardiac disease
Q2Background: Congenital heart disease (CHD) is the most common congenital malformation, it is frequently found as an isolated defect,
and the etiology is not completely understood. Although most of the cases have multifactorial causes, they can also be secondary to chromosomal abnormalities, monogenic diseases, microduplications or microdeletions, among others. Copy number variations (CNVs) at
22q11.2 are associated with a variety of symptoms including CHD, thymic aplasia, and developmental and behavioral manifestations. We
tested CNVs in the 22q11.2 chromosomal region by MLPA in a cohort of Colombian patients with isolated CHD to establish the frequency of
these CNVs in the cohort.
Methods: CNVs analysis of 22q11.2 by MLPA were performed in 32 patients with apparently isolate CHD during the neonatal period. Participants were enrolled from different hospitals in Bogotá, and they underwent a clinical assessment by a cardiologist and a clinical
geneticist.
Results: CNVs in the 22q11.2 chromosomal region were found in 7 patients (21.9%). The typical deletion was found in 6 patients (18.75%)
and atypical 1.5 Mb duplication was found in 1 patient (3.1%).
Conclusions: CNVs in 22q11.2 is a common finding in patients presenting with isolated congenital cardiac disease, therefore these
patients should be tested early despite the absence of other clinical manifestations. MLPA is a very useful molecular method and provides
an accurate diagnosis.Revista Internacional - Indexad
La metodología tarifaria y el marco regulatorio del servicio público de aseo en Colombia; dos variables que no se ajustan a la realidad
This research aims to make a critical analysis of the two methodologies to service existing grooming in Colombia, for which the theoretical framework is analyzed market failures economic theories and of regulation. The existence of socioeconomic methodologies and distortions in the calculation of service costs is relevant. Therefore, a new methodology should incorporate in your fare economic, political, social, institutional, cultural and environmental criteria, so that in this way the model is updated by adding new variables.Esta investigación tiene como objetivo hacer un análisis crítico de las dos metodologías para el servicio de aseo existente en Colombia, para lo cual se analiza el marco teórico, las fallas del mercado y las teorías económicas de la regulación. La existencia de metodologías socioeconómicas y las distorsiones en el cálculo de los costos del servicio son relevantes. Por lo tanto, una nueva metodología debe incorporar en su tarifa criterios económicos, políticos, sociales, institucionales, culturales y ambientales, por lo que de esta manera el modelo se actualiza mediante la adición de nuevas variables
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