Examinando por Autor "Martínez, Ana"

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    Enhanced ultrafiltration PES membranes doped with mesostructured functionalized silica particles
    (Elsevier, 2014) Martín, Antonio; Arsuaga, Jesús M.; Roldán, Nuria; Abajo, Javier de; Martínez, Ana; Sotto, Arcadio
    Novel hybrid ultrafiltration membranes have been prepared by incorporation of mesostructured functionalized silica particles in polyethersulfone. Physico-chemical characterization of synthesized materials was accomplished to determine the textural and structural properties of particles by nitrogen adsorption-desorption and TEM. A successful functionalization of silica with amine and carboxylic groups was confirmed by means of MAS-NMR. Membrane surface morphology was studied in terms of pore size distribution, porosity and hydrohilicity, suggesting a great influence of mesostructured silica incorporation in polyethersulfone on the polymer matrix configuration. Membrane functions were significantly improved as result of considerable increase of water permeation without affect negatively the membrane selectivity. The antifouling membranes properties were also enhanced, especially against to irreversible fouling. Multi-run fouling tests of modified membranes confirmed the stability of permeation through membranes doped with mesostrucutred functionalized silica particles.
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    The Effect of Copper on the Color of Shrimps: Redder Is Not Always Healthier
    (PlosOne, 2014) Martínez, Ana; Romero, Yanet; Castillo, Tania; Mascaró, Maite; López-Rull, Isabel; Simoes, Nuno; Arcega-Cabrera, Flor; Gaxiola, Gabriela; Barbosa, Andres
    The objective of this research is to test the effects of copper on the color of pacific white shrimp (Litopenaeus vannamei) in vivo. Forty-eight shrimps (L. vannamei) were exposed to a low concentration of copper (1 mg/L; experimental treatment) and forty-eight shrimps were used as controls (no copper added to the water). As a result of this experiment, it was found that shrimps with more copper are significantly redder than those designated as controls (hue (500–700 nm): P = 0.0015; red chroma (625–700 nm): P,0.0001). These results indicate that redder color may result from exposure to copper and challenge the commonly held view that highly pigmented shrimps are healthier than pale shrimps.