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Buenos Aires, Argentina

In this review, we show that the existence of Y chromosome sequences in women with Turner syndrome is a risk factor for the development of gonadoblastoma, especially if it is present in the karyotype of patients in mosaic and / or as hidden sequences. In the literature, controversial results have been found in epidemiological studies of cancer, in cases with gonadoblastoma or other ovarian malignancies in Turner syndrome. In addition, some women have Y sequences in mosaicism but do not develop gonadal tumors. A population of 282 Argentinean patients with Turner syndrome was evaluated for the presence of hidden Y chromosome material (mosaicism) by PCR and in 8 of these patients (2.83%) with Y chromosome sequences, gonadoblastoma was found after removal of the gonad. In the literature, hidden Y chromosome material (mosaics) is often high in Turner syndrome, but the appearance of gonadoblastoma among patients with these sequences appears to be low. It is important to note that SRY gene sequences could only be studied as a marker of mosaicism in patients with Turner syndrome, because the locus for gonadoblastoma / dysgerminoma, probably is near the centromere far away from SRY gene. Recent publications suggest that the actual risk assessment of gonadal tumor development in patients with TS with Y-derived sequences in their chromosome constitution may require a specific histopathology, such as OCT4 immunohistochemistry. Therefore, it is clear that the removal of the gonads is still an important tool for prevention in patients with Turner syndrome, when Y chromosome sequences are found. Copyright © 2011 por la Sociedad Argentina de Endocrinología y Metabolismo. Source

Villarreal M.F.,CONICET | Villarreal M.F.,University of Buenos Aires | Cerquetti D.,Fundacion contra la Lucha de las Enfermedades Neurologicas de la Infancia FLENI | Caruso S.,CAECE University | And 5 more authors.
PLoS ONE | Year: 2013

Previous studies of musical creativity suggest that this process involves multi-regional intra and interhemispheric interactions, particularly in the prefrontal cortex. However, the activity of the prefrontal cortex and that of the parieto-temporal regions, seems to depend on the domains of creativity that are evaluated and the task that is performed. In the field of music, only few studies have investigated the brain process of a creative task and none of them have investigated the effect of the level of creativity on the recruit networks. In this work we used magnetic resonance imaging to explore these issues by comparing the brain activities of subjects with higher creative abilities to those with lesser abilities, while the subjects improvised on different rhythmic fragments. We evaluated the products the subjects created during the fMRI scan using two musical parameters: fluidity and flexibility, and classified the subjects according to their punctuation. We examined the relation between brain activity and creativity level. Subjects with higher abilities generated their own creations based on modifications of the original rhythm with little adhesion to it. They showed activation in prefrontal regions of both hemispheres and the right insula. Subjects with lower abilities made only partial changes to the original musical patterns. In these subjects, activation was only observed in left unimodal areas. We demonstrated that the activations of prefrontal and paralimbic areas, such as the insula, are related to creativity level, which is related to a widespread integration of networks that are mainly associated with cognitive, motivational and emotional processes. © 2013 Villarreal et al. Source

Grilli M.G.,Instituto Antartico Argentino | Marti L.J.,CAECE University | Montalti D.,Instituto Antartico Argentino
Revista Brasileira de Ornitologia | Year: 2014

The diet of chicks may change according to their growth and also vary between siblings due to their competitive relationship. Diet composition of 81 Brown Skua (Stercorarius antarcticus lonnbergi) chicks was analysed from regurgitated stomach contents in order to determine changes in diet composition related to chick age and differences between siblings. Fifty-nine of the samples belonged to chicks whose age was estimated by applying culmen measurement to a regression function. The remaining 22 samples belonged to 11 sibling pairs whose stomach contents were simultaneously sampled. The diet was constituted mostly by soft tissues of penguins. Marine resources were a minor part of the diet of chicks, appearing in the third week of their life. The qualitative composition of the stomach content of siblings was similar in most cases, but mass of regurgitates differed between siblings (1.3-90.0% = 0.5-9 g), which suggests the potential existence of aggressive food monopolization by one sibling, an issue to be elucidated with further research. © 2015 Sociedade Brasileira de Ornitologia. All rights reserved. Source

Perez Comesana J.E.,University of Buenos Aires | Perez Comesana J.E.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia | Perez Comesana J.E.,National University of Central Buenos Aires | Clavin P.,CAECE University | And 3 more authors.
Journal of Applied Ichthyology | Year: 2014

Predictive regression equations were generated to estimate total length of the Brazilian flathead (Percophis brasiliensis) fish using skull and pectoral girdle bones as well as specific body and otolith lengths. All regressions were statistically significant. The features of bone and external body regressions evidently have the capability to increase the amount of dietary information obtainable from stomach content analyses of the Southwest Atlantic piscivores. © 2013 Blackwell Verlag GmbH. Source

Fernandez L.,CONICET | Dominino J.,Delegacion Centro Administracion Of Parques Nacionales | Brancolini F.,CAECE University | Baigun C.,CONICET
Ichthyological Exploration of Freshwaters | Year: 2011

Silvinichthys leoncitensis, new species, is described from Leoncito National Park in the Andes of Argentina. The new species is distinguished from the other two known congeners by the coloration pattern, consisting of a dark marmorated head and body that fades to a paler color ventrally, the pelvic fin and girdle absent, seven to nine opercular odontodes, 18-28 interopercular odontodes, caudal-fin length 19.9-24.0% SL, length of dorsal fin base 10.1-13.1% SL, and head width 13.3-15.9% SL. Silvinichthys leoncitensis is endemic to the type locality, which is situated in the Andean Cordillera of the San Juan province, Argentina. Silvinichthys leoncitensis is hypothesized to be a sister species of S. bortayro. © 2011 by Verlag Dr. Friedrich Pfeil, München, Germany - ISSN 0936-9902. Source

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