Mixed WO3 – CuWO4 films have been prepared from aqueous solution of copper sulfate and polytungsten gel with molar ratio Cu/W from 0 to 100 %. These solutions were sprayed onto alumina substrates at 220 ºC. The obtained films were amorphous, and crystallized after an annealing at 300 °C in air for 3 h. The annealed films were composed by a mixture of CuWO4 and WO3 phases. The film obtained from a solution with an equimolar ratio of Cu/W was a pure CuWO4. The pure WO3 films obtained have a high surface “irregularities” (eventually the porosity). Those surface “irregularities” in the films were maintained or eventually increased as Cu/W molar ratio augments in the starting solution up to 10%. The gas sensitivities to butanol and ethanol vapors are also enhanced when the CuWO4 phase increases in the film up to 7% - 10%; further increments to this proportion the detection sensiti...

This work has been financially supported by the International Program for Physical Science of Uppsala University (IPPS), the Instituto de Investigación of Universidad Nacional de Ingenieria, and CONCYTEC (Peruvian Research Council).

El HTLV-1 es un retrovirus endémico en el Perú, ocasionalmente asociado con algunas infecciones oportunistas aisladas. Presentamos el caso de un avicultor de 41 años con antecedentes de tuberculosis pulmonar tratado hace 6 meses. Ingresó en emergencia por alteración de la conciencia, disartria y diarrea acuosa. El examen reveló placas confluentes en la cavidad oral, lesiones maculopapulares violáceas y placas costrosas. La biopsia de piel confirmó el sarcoma de Kaposi y la sarna costrosa; Además, las linfadenopatías cervicales mostraron evidencia de BAAR (++) en el estudio microscópico con prueba de auramina, y en el examen de las heces con tinción de Zielh Nielsen modificada, se observó oistato de Cystoisospora belli y tratamiento antituberculoso con trimetropin / sulfametozaxol. El HTLV-1 fue confirmado por inmunofluorescencia. En el fondo del ojo se evidenció retinitis p...