Rogelio Ferrer

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RNA viruses offer a unique opportunity for the study of evolution at the molecular level. Recent experiments involving clonal populations of RNA viruses have shown that competition among virus strains of approximately equal relative fitness can result in the eventual competitive exclusion of one of the species. As competition proceeds in time, both the(More)
A method based on capillary zone electrophoresis coupled with photodiode-array detection has been developed to determine several sulfonated dyes, including a sulfonated dye (acid yellow 1), and the sulfonated azo dyes acid orange 7, acid orange 12, acid orange 52, acid red 26, acid red 27 and acid red 88. A CElect-FS75 CE column is used. The electrophoresis(More)
Synchronous fluorescence spectra of mixtures containing ten polycyclic aromatic hydrocarbons (anthracene, benz[a]anthracene, benzo[a]pyrene, chrysene, fluoranthene, fluorene, naphthalene, perylene, phenanthrene and pyrene) have been used for the determination of these compounds by Partial Least Squares Regression (PLSR), using both PLS-1 and PLS-2.(More)
Three-way partial least-squares and n factor parallel factor analysis have been compared for the analysis of polycyclic aromatic hydrocarbons in water samples. Data were obtained with a chromatographic system set to record short-time chromatograms containing several unresolved peaks. The detection system consisted of a fast-scanning fluorescence spectra(More)
A new screening method for the analysis of enrofloxacin and ciprofloxacin in edible animal tissues is described. The method is based on the application of principal component regression to luminescence measurements after reaction of quinolones with terbium(III) in a micellar medium. The method was used, first, to discriminate between quinolone-containing or(More)
This paper describes the status of the numerical whirl-flutter investigation of the European tiltrotor concept that is carried over by the EU funded ADYN Consortium within Work Package 1. The European tiltrotor concept is based on an innovative approach to the design of tilting rotor aircraft that minimizes the drawbacks related to rotor-wing interaction(More)
Mass values contribute to a number of physical models: these range from masses of exotic short-lived nuclides being important for weak interaction studies and the Standard Model of particle physics, to stable masses as means for the definition of fundamental constants [1]. Since the discovery of the superheavy elements from to , the investigations in their(More)
This is a study about the hydration process of a mixture of Portland cement and solar photovoltaic cells waste. The nature of the hydration products of different compositions of these mixtures have been evaluated, at 20o C of temperature, by means of the analysis of samples throughout xray diffraction and infrared spectroscopy. The total porosity and(More)
A Penning trap mass spectrometer is a well established instrument for the precise mass determination of both, stable and short-lived nuclides. For this purpose two different concepts are employed. Masses of stable species are mostly determined by the non-destructive detection of image currents induced in the trap electrodes and a subsequent Fourier(More)
This thesis presents the design, fabrication, testing and analytical study of a novel concept<lb>of actively controlled Hiller type servopaddle to achieve rotor primary control. The blades on the<lb>swashplateless rotor are coupled to a servopaddle equipped with a piezo electrically actuated aileron<lb>located behind the paddle trailing edge. The aileron is(More)