Motivaciones ocupacionales en adultos

Se intentó conocer las motivaciones ocupacionales en sujetos adultos de ambos sexos, cuyas edades fluctuaron entre los 20 y 50 años. Se trabajó con 150 sujetos; hombres y mujeres divididos equitativamente. Se aplicó el Cuestionario de Motivaciones Ocupacionales (Faletty & Moreno, 1999) evaluando de manera individual a los sujetos. Analizamos en este artículo solamente los ítemes de este cuestionario en que se encontraron diferencias significativas entre hombres y mujeres

Planck pre-launch status : The Planck mission

Peer reviewe

7th Drug hypersensitivity meeting: part two

No abstract availabl

A taxonomic backbone for the global synthesis of species diversity in the angiosperm order Caryophyllales

The Caryophyllales constitute a major lineage of flowering plants with approximately 12500 species in 39 families. A taxonomic backbone at the genus level is provided that reflects the current state of knowledge and accepts 749 genera for the order. A detailed review of the literature of the past two decades shows that enormous progress has been made in understanding overall phylogenetic relationships in Caryophyllales. The process of re-circumscribing families in order to be monophyletic appears to be largely complete and has led to the recognition of eight new families (Anacampserotaceae, Kewaceae, Limeaceae, Lophiocarpaceae, Macarthuriaceae, Microteaceae, Montiaceae and Talinaceae), while the phylogenetic evaluation of generic concepts is still well underway. As a result of this, the number of genera has increased by more than ten percent in comparison to the last complete treatments in the Families and genera of vascular plants” series. A checklist with all currently accepted genus names in Caryophyllales, as well as nomenclatural references, type names and synonymy is presented. Notes indicate how extensively the respective genera have been studied in a phylogenetic context. The most diverse families at the generic level are Cactaceae and Aizoaceae, but 28 families comprise only one to six genera. This synopsis represents a first step towards the aim of creating a global synthesis of the species diversity in the angiosperm order Caryophyllales integrating the work of numerous specialists around the world

Major lithostratigraphic units in land-outcrops of north-central Mexico and the subsurface along the northern rim of Gulf of Mexico Basin (Upper Jurassic-lowermost Cretaceous): a proposal for correlation of tectono-eustatic sequences

The stratigraphic and geodynamic interpretation of Upper Jurassic lithostratigraphic units is revised in north-central Mexico and the northern rim of the Gulf of Mexico Basin through updated ammonite and calpionellid biochronostratigraphy. Significant events in the geodynamic evolution in these areas are evaluated and interpreted in terms of tectono-eustatic sequences (TES) of third and second orders. 3rd-TES-I and 2nd-TES-II/III in Mexico and 3rd-TES-I, 3rd-TES-II and 3rd-TES-III at the northern rim of the Gulf of Mexico show the main traits of the Upper Jurassic Supercycle in these regions, allowing the identification of a combined 'Atlantic-Tethyan cachet' in the course of structuring/configuration of the Gulf of Mexico Basin during the Late Jurassic. The easy identification of 3rd-TES-I in north-central Mexico and at the northern rim of the Gulf of Mexico Basin shows no significant difference in geodynamic history during the Oxfordian, which contrasts with the increasing difference from the Kimmeridgian to the Early-Middle Berriasian. Shared trends in stratigraphic architecture with the European margin of the North Atlantic Basin, as well as with epicontinental shelves surrounding Iberia and other Tethyan areas, are interpreted to show phases of the geodynamic evolution in the central North Atlantic Basin, traces of which are recognizable also in western Africa. (C) 2003 Elsevier Ltd. All rights reserved

Factors controlling upper Jurassic ammonite assemblages in north central Mexico

Lower Kimmeridgian to Lower Tithonian (Upper Jurassic) sections studied at Sierra de Palotes (Durango) and Sierra de Catorce (San Luis Potosi), Mexico, show low-energ deposits in which the composition of fossil macroinvertebrate assemblages, including megabenthos, reflects biostratinomic control. Monotonous siltstones provide continuous records of ammonite assemblages and reflect dominant deposition of shells in living area

Geographic control on phenotype expression. The case of Hybonoticeras mundulum (Oppel) from the Mexican Altiplano

Hybonoticeras mundulum (Oppel) (m) s.s. is reported from the Mexican Altiplano on the basis of material collected bed-by-bed in sections in the States of Durango and Zacatecas. The known range of this species in the Mexican Altiplano is interpreted to be uppermost Kimmeridgian (upper to uppermost Beckeri Zone) to lowermost Tithonian (basal to lower Hybonotum Zone). The Mexican specimens studied are the most complete and valuable collection of H. mundulum (Oppel) s.s. known from a given area, and reveal that Mexican populations show phenotypic features different from European ones. Vicariant events accord with data available about the areal and biostratigraphic distribution of this species, as well as with the combination of allocyclic and autocyclic factors influencing Mexican seas, the breaking of populations rather than colonization events, and the impoverished ammonite assemblages showing endemic traits within the stratigraphic interval studied