To develop a better understanding of the natural distribution of the fall armyworm, Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae), and to update the knowledge of the incidence of its complex of parasitoids. S. frugiperda, samplings in whorl-stage corn were carried out in provinces of Argentina from 1999 to 2003. S. frugiperda larvae were collected from corn in localities of the provinc...

1 h El modelo obtenido usando esta modificación en el índice ( c), presenta mejores corn parámetros estadísticos respecto cuando se usa el índice original. Sin embargo, el error promedio producido en la diferencia entre la variable dependiente experimental y la calculada no muestran diferencias significativas entre ambos modelos. Palabras clave: Alcoholes, índice de conectividad modificado, mod...

The Harvard School began with the early Mason/Bain research about the performance of the firms to get market power. This proposal opened a different field of the neoclassical economic theory valid since Alfred Marshall, whereas the Chicago scholars continued with the traditional paradigm. Nowadays the three main issues of discussion between these two schools of economic thought are the same as ...

r e s u m e n Este artículo es una revisión de los avances teóricos y los hallazgos empíricos relacionados con las representaciones sociales de acuerdo con el enfoque estructural, una corriente de investigación que tiene como objetivo estudiar la influencia de factores sociales en los procesos de pensamiento a través de la identificación y caracterización de relaciones estructurales. La present...

Indentation cracks on ceramics are frequently used not only for the semi-empirical determination of the fracture toughness KIC but also as a method for generating semielliptical surface cracks to be used in as starting cracks in fracture and fatigue studies. Tetragonal zirconia stabilized with 3 % mol of yttria (3Y-TZP) is a biocompatible ceramic with good mechanical properties which is used in...

The indentation method has been widely used to measure the fracture toughness in fragile materials due to its simplicity and that only needs of a small sample. However, it is well known that the fracture toughness values obtained by indentation methods can be substantially different from the values obtained from more rigorous methods which are based on a precise knowledge of all parameters invo...

In the late-nineteenth century the regulation of food quality and safety experienced a clear turning point with the establishment of new sites for food controls, the emergence of new experts and the passing of food laws. One of the main changes in the regulation came with a reconceptualization of quality based on composition; a change which was in accordance with the standardizing trends then a...

El debate sobre la denominada gestación subrogada está arreciando en España de la mano de una campaña política a favor de su regulación. En 2016, en Suecia, sin embargo, se avanzó hacia la prohibición de la gestación subrogada1. No se admite la versión comercial, el modelo californiano2, que es la que responde al boom del turismo reproductivo –una forma de outsourcing a países empobrecidos–, pe...