Effect of Agave tequilana age, cultivation field location and yeast strain on tequila fermentation process.

The effect of yeast strain, the agave age and the cultivation field location of agave were evaluated using kinetic parameters and volatile compound production in the tequila fermentation process. Fermentations were carried out with Agave juice obtained from two cultivation fields (CF1 and CF2), as well as two ages (4 and 8 years) and two Saccharomyces cerevisiae yeast strains (GU3 and AR5) isolated from tequila fermentation must. Sugar consumption and ethanol production varied as a function of cultivation field and agave age. The production of ethyl acetate, 1-propanol, isobutanol and amyl alcohols were influenced in varying degrees by yeast strain, agave age and cultivation field. Methanol production was only affected by the agave age and 2-phenylethanol was influenced only by yeast strain. This work showed that the use of younger Agave tequilana for tequila fermentation resulted in differences in sugar consumption, ethanol and volatile compounds production at the end of fermentation, which could affect the sensory quality of the final product.

Estimulacion auricular permanente para tratamiento del nodo sinusal enfermo. Informe de nueve casos. / Permanent auricular stimulation for sick sinus treatment. Report of 9 cases

Se informan los primeros nueve casos de nodo sinusal enfermo seleccionados para tratamiento con marcapaso auricular a demanda (AAI). Se enuncian los criterios de seleccion, los resultados de las pruebas de estimulacion auricular realizadas y los resultados clinicos obtenidos. La via transvenosa utilizada para la implantacion fue preferentemente la vena cefalica derecha. Se utilizaron cables electrodos preformados en forma de J y generador multiprogramable. Se comenta la dislocacion del cable en dos de los casos y las perspectivas futuras para evitar este problema. Se ponderan las ventajas de conservar la sincronica auriculoventricular electrica y mecanica