Ciencia y Tecnología

Comportamiento de incubación de Chororó (Taraba Major) Y Choca Co‐ Mún (Thamnophilus Caerulescens) en Argentina

CONICET Digital -

Comportamiento de incubación de Chororó (Taraba Major) Y Choca Co‐ Mún (Thamnophilus Caerulescens) en Argentina; Incubation behavior of Great Antshrike (Taraba major) and Variable Antshrike (Thamnophilus caerulescens) in Argentina Schaaf, Alejandro Alberto; Peralta, Giovana Claudia; Diaz, Agustín Eduardo; Luczywo, Ayelen; Peluc, Susana Ines  La familia Thamnophilidae agrupa unas doscientas especies de aves paseriformes. Si bien en los últimos años se ha avanzado en el conocimiento de la biología reproductiva de muchas de estas especies, todavía hay algunas para las que ciertos parámetros reproductivos son aún desconocidos. Con el presente trabajo contribuimos al conocimiento de la biología reproductiva del Chororó (Taraba major) y la Choca Común (Thamnophilus caerulescens), aportando principalmente datos sobre su comportamiento de incubación en la provincia de Córdoba, Argentina, en el extremo sur de su distribución. Registramos tamaño de la puesta, duración del período de incubación y otras variables asociadas al comportamiento de incubación utilizando sensores remotos y observaciones directas, y medimos cre‐ cimiento de pichones en el nido. En las dos especies los adultos compartieron tareas de incubación, y el porcentaje de atención diario al nido fue elevado en ambas (T. major: 91,46%; T. caerulescens: 92,52%). El patrón de incubación durante las horas de luz resultó diferente entre las especies. Para T. major, con el transcurso del día aumento la duración y disminuyó la cantidad de los eventos de incubación y recesos. En contraposición, para T. caerulescens ambas variables se mantuvieron constantes a lo largo del día. Los datos aportados por este trabajo enriquecen el conocimiento de la biología reproductiva de especies de tamnofílidos poco estudiadas, y sirven de base para investigar respecto a los factores que moldean los comportamientos de cuidado parental en estas aves.  ; The Thamnophilidae family comprises approximately 200 species of passeriforme birds. Even though in the last years there has been advancement in the knowledge of the reproductive biology of many of those species, there are still species for which several reproductive parameters are unknown. With this work we contribute to the knowledge of the reproductive biology of the Great Antshrike (Taraba major) and the Variable Antshrike (Thamnophilus caerulescens) mainly providing data on their incubation behavior in the province of Córdoba, Argentina, corresponding to their southernmost distribution. We recorded clutch size, total duration of the incubation period, and other variables associated with incubation behavior by means of remote sensors and direct observations. In both species, adults shared incubation duties and nest attentiveness was high (T. major: 91.46%; T. caerulescens: 92.52%). The pattern of incubation for daylight hours was different between the species. In the case of T. major, the duration of on and off bouts increased during the course of the day, and the number of bouts decreased. In contrast, for T. caerulescens both variables remained constant throughout the day. The data provided in this study enriches our knowledge of the reproductive biology of understudied Thamnophilidae species, and are useful as baseline information to investigate the factors that shape parental care behaviors in these birds.

Armstrong, un pueblo con energía inteligente

ANPCyT -

Con mil medidores inteligentes, esta localidad santafesina puede controlar el desempeño de la red eléctrica. El Ministerio de Ciencia financió con más de $14 millones a un consorcio público-privado para consolidar este sistema con energía proveniente de fuentes renovables.

ANR 1600 2014 C3

ANPCyT -

El Fondo Tecnológico Argentino (FONTAR) anuncia los resultados del proceso de reconsideración para la convocatoria ANR 1600 2014 C3 mediante Resolución de Directorio N°327/16.

Mathematical modelling of microtumour infiltration based on in vitro experiments

CONICET Digital -

Mathematical modelling of microtumour infiltration based on in vitro experiments Luján, Emmanuel; Guerra, Liliana Noemi; Soba, Alejandro; Visacovsk, Nicolás; Gandia, Daniel; Calvo, Juan Carlos; Suárez, Cecilia Ana The present mathematical models of microtumours consider, in general, volumetric growth and spherical tumour invasion shapes. Nevertheless in many cases, such as in gliomas, a need for more accurate delineation of tumour infiltration areas in a patient-specific manner has arisen. The objective of this study was to build a mathematical model able to describe in a case-specific way as well as to predict in a probabilistic way the growth and the real invasion pattern of multicellular tumour spheroids (in vitro model of an avascular microtumour) immersed in a collagen matrix. The two-dimensional theoretical model was represented by a reaction?convection?diffusion equation that considers logistic proliferation, volumetric growth, a rim with proliferative cells at the tumour surface and invasion with diffusive and convective components. Population parameter values of the model were extracted from the experimental dataset and a shape function that describes the invasion area was derived from each experimental case by image processing. New possible and aleatory shape functions were generated by data mining and Monte Carlo tools by means of a satellite EGARCH model, which were fed with all the shape functions of the dataset. Then the main model is used in two different ways: to reproduce the growth and invasion of a given experimental tumour in a case-specific manner when fed with the corresponding shape function (descriptive simulations) or to generate new possible tumour cases that respond to the general population pattern when fed with an aleatory-generated shape function (predictive simulations). Both types of simulations are in good agreement with empirical data, as it was revealed by area quantification and Bland?Altman analysis. This kind of experimental?numerical interaction has wide application potential in designing new strategies able to predict as much as possible the invasive behaviour of a tumour based on its particular characteristics and microenvironment.

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