This article is a result of the necessity of discussing the many impacts that the globalization process, since it affects way the political, economical and social relations, that are expressed in the environmental degradation and becomes a strong threat to the health of individuals and communities in the local and global levels. Intends to stimulate a reflection from the interdisciplinary analysis of the developed knowledge about categories like globalization, environment and health, and their articulation with the professional nursing practice. In a methodological point of view, it is systematization from primary and secondary bibliographic sources including indexed ones. We conclude that the professional nursing practice in the XXI century demands confronting the challenge of resize the concept of nursing care, must be understood not as an act but as a caring actitude and a commitment to the protection of life of this and future's generations.

Este artículo surge de la necesidad de discutir los diversos impactos generados por el proceso de globalización en la medida que interfiere en las relaciones políticas, económicas, sociales, culturales, que se expresan en degradación ambiental y constituyen fuertes amenazas para la salud de individuos y comunidades a nivel local y global. Se propone estimular la reflexión a partir del análisis interdisciplinar del conocimiento producido sobre macro categorías como globalización, medio ambiente y salud y su articulación con el ejercicio profesional del enfermero. Metodológicamente se trata de una sistematización a partir de fuentes bibliográficas primarias y secundarias disponibles inclusive en bases indexadas. Podemos concluir que el ejercicio profesional de enfermería en el siglo XXI exige enfrentar el desafío de (re)dimensionar el cuidado, que debe ser entendido no como un acto y si como una actitud cuidadora y un compromiso con la defensa de la vida de ésta y las futuras generaciones.

Ab initio Hartree-Fock (HF), Density Functional (B3LYP) and electron correlation (MP2) methods have been used to caracterize the aqueous medium intramolecular hydrogen bond in <FONT FACE="Symbol">a</font>-alanine. The 6-31G* and 6-31++G** were taken from Gaussian94 library. We were concerned on the structure of three conformers of <FONT FACE="Symbol">a</font>-alanine, in their neutral form plus on the structure of the zwitterionic form (Z). The Z structure is a stationary point at the HF/6-31G* level but it is not when diffuse functions and electron correlation are included. This results shows that the Z form does not exist in the gas phase. The inclusion of solvent effects changed significantly the results obtained in gas phase, therefore this inclusion make the Z form a stationary point within all level of theory, and the relative energy depends dramatically on the level of calculation.