Cohomology ring of the brst operator associated to the sum of two pure spinors

In the study of the Type II superstring, it is useful to consider the BRST complex associated to the sum of two pure spinors. The cohomology of this complex is an infinite-dimensional vector space. It is also a finite-dimensional algebra over the algebra of functions of a single pure spinor. In this paper we study the multiplicative structure. © 2013 World Scientific Publishing Company.

Bases para el desarrollo de la industria de bienes de capital en un marco de cooperación regional

Discute las actividades de las instituciones vinculadas al sector de bienes de capital participantes en la reunion, con el fin de coordinar los trabajos futuros, aprovechar los recursos reciprocos y concertar esfuerzos convergentes a la preparacion de las reuniones intergubernamentales que se consideren pertinentes.

Silver(I) complexes with symmetrical Schiff bases: Synthesis, structural characterization, DFT studies and antimycobacterial assays

Synthesis, structural and spectroscopic characterizations, molecular modeling and antimycobacterial assays of new silver(I) complexes with two Schiff bases - MBDA and MBDB - are reported. The complexes [Ag(MBDA) 2]NO3, or AgMBDA, and [Ag(MBDB)NO3] or AgMBDB, were obtained by the reaction of the respective ligands with silver(I) nitrate in methanol. The Schiff bases were previously obtained by mixing ethylenediamine or 1,3-diaminopropane with p-anisaldehyde. The characterizations of the complexes were based on elemental (C, H and N) and thermal (TG-DTA) analyses and 13C and 1H NMR and FT-IR spectroscopic measurements, as well as X-ray structure determination for AgMBDA. Spectroscopic data predicted by DFT calculations are in agreement with the experimental data for the AgMBDA complex. The AgMBDA complex has a monomeric structure with a molar proportion 1:2 Ag/ligand, while AgMBDB presents a 1:1 proportion. The complexes AgMBDA and AgMBDB showed to be more effective against Mycobacterium tuberculosis than antibacterial agent silver sulfadiazine - SSD. © 2013 Elsevier Ltd. All rights reserved.

Informe del Taller Bases Metodológicas para las Cuentas Patrimoniales de Magallanes

Presenta la organización, temario y resumen de los debates del taller que tuvo como propósito conocer y discutir las propuestas generadas en Magallanes con respecto a la elaboración de una metodología para estudiar las cuentas del patrimonio natural y cultural.

Bases para estructurar el sistema nacional de información y documentación

Incluye Bibliografía

Bases para la formulación de un programa de cooperación regional en el dominio de la juventud en América Latina y el Caribe para la década de los noventa

Incluye Bibliografía