Revista de Química. Vol. 21 Núm. 1-2 (2007)
URI permanente para esta colecciónhttps://hdl.handle.net/20.500.14657/185288
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Ítem Texto completo enlazado Análisis Forense Elemental del Vidrio(Pontificia Universidad Católica del Perú, 2007) Rodríguez, Mariela; Winefordner, JamesAt identifying glass as forensic evidence, there is a continued move away from dependence on physical properties measured, such as index of refraction and density, towards methods of elemental analysis of its traces. Several spectroscopic, radiochemical and mass spectrometry techniques have been applied for multielemental analysis of small samples of glass. This review shows some of the most commonly used methods, as well as their advantages and limitations.Ítem Texto completo enlazado Diseño de Agentes Antidiabéticos de Vanadio: Desarrollo y Avances Recientes(Pontificia Universidad Católica del Perú, 2007) Alvino De la Sota, Nora; Pacheco Calderón, JavierDesign of Vanadium Antidiabetic Agents: Development and Recent AdvancesThe discovery of the enhanced hypoglycemic activity of bis(maltolate)oxovanadiu m (IV) (BMOV) compared to simplevanadium salts stimulated the design, synthesis and both in vitro and in vivo evaluation of a large variety of oxovanadium (IV)complexes with different organic ligands for their potential use as antidiabetic drugs that may be able to substitute, either partially or totally, the daily insulin injections used in the treatment of type 1 diabetes mellitus or the orally available hypoglycemic drugs usually used in combined therapy for type 2 diabetes.Recently, a close BMOV analogue, an ethyl substitute, has already successfully completed the phase 1 clinical trial in humans. The design of new types of complexes and the development of alternative delivery methods represent an active research field today.Ítem Texto completo enlazado Estado actual de la investigación sobre Ipomoea carnea: toxicidad en ganado caprino(Pontificia Universidad Católica del Perú, 2007) Sabogal, Ana; Borkowski, DuninIpomoea carnea from the dry forest of Peru appears undertwo sub-species: carnea and fistulosa. This study reviews thecauses of toxicity by Ipomoea carnea and its toxic effects oncaprine herds. The presence of swansonina and calysteginaalkaloids, and of selenium, are studied as causes of toxicity.The relationship between selenium distribution on soil and itsabsorption by plants in Jaguar Negro, Las Lomas y Coto deCaza El Angolo, in the departament of Piura, is studied.Ítem Texto completo enlazado Introducción al Uso de la Filatelia en la Enseñanza de la Química(Pontificia Universidad Católica del Perú, 2007) Rabinovich, DanielIntroduction to the Use of Philatelic for Teaching ChemistryThis article offers an introduction to the world of chemistrythrough its representation in postage stamps and other philatelicmaterials from many countries. Besides famous chemists orNobel prize winners in chemistry, there are stamps showingatoms, molecules, minerals, symbols and chemical formulas,the periodic table, laboratory equipment, and various aspectsof chemical industry. Such stamps can easily be used to portrayseveral themes for teaching chemistry at all levels, or can beused together with anecdotes or historical details, for example,to make technical presentations much more attractiveÍtem Texto completo enlazado La Química de Superficies y su Relación con la Microelectrónica(Pontificia Universidad Católica del Perú, 2007) Rodríguez-Reyes, Juan Carlos F.Surface Chemistry and its Relation to MicroelectronicsCircuits forming part of any electronic device are more efficient, but at the same time the dimension s of theircomponents are reduced constantly and they will soon reach the atomic scale. Each component has to be carefully deposited as a thin film on a surface which, on the atomic scale, is only possible if the chemical reactions involved in the process areunderstood and controlled. This article describes initially the techniques for thin film formation on substrates, emphasizingthe current importance of organometallic compounds during this process. For example, one of these compounds, tetrakis-(dimethylamido)-titanium(IV), Ti[N(CH ) ] , is used, together with ammonia (NH3), for the formation of titanium nitride films. The reaction of both compounds with a silicon surface is investigated, and it is found that in both cases the reaction starts through the interaction of a N lone pair with the surface, followed by dissociation of molecules. The elucidation of these mechanisms are important not only for controlling the thin film deposition processes, but also for the growing field of molecular electronics, where the formation of molecular architectures of the surface is a requisite. This article also includes a brief review of selected topics related to surface chemistry that are relevant for the present investigation, such as the types of surface reactions, properties of the silicon surface and the use of spectroscopic and computational techniques in this field.Ítem Texto completo enlazado Revista de Química: Volumen XXI –20 años de publicación continua(Pontificia Universidad Católica del Perú, 2007) Revista de QuímicaNo presenta resumen