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San Leonardo de Yagüe, Spain

Perez-Lopez B.,Biosensors | Perez-Lopez B.,Technological Center | Merkoci A.,Biosensors
Analytical and Bioanalytical Chemistry | Year: 2011

Nanoparticles serve as fundamental building blocks for nanobiotechnology, especially in several applications in the development of novel (bio)sensing systems. Nanoparticles can be used for modification of the surfaces of (bio)sensing transducers or as optical or electroactive labels to improve different aspects of performance, for example sensitivity, detection limit, multidetection capability, and response stability. Nanoparticles can be integrated into the transducer materials on an individual basis or inside other matrices to ensure the immobilization of recognition biomolecules and/or receptors which are the principal components of the (bio)sensing systems. Incorporation of nanoparticles into optical and electrochemical (bio)sensing systems, including their use in microfluidic based systems has the advantages of enabling the design of robust, easy to use, portable, and cost-effective devices. © 2010 Springer-Verlag. Source

Regueiro L.,University of Santiago de Compostela | Carballa M.,University of Santiago de Compostela | Alvarez J.A.,Technological Center | Lema J.M.,University of Santiago de Compostela
Bioresource Technology | Year: 2012

Co-digestion of pig manure (PM. 1PM, pig manure;1) with fish (FW. 2FW, fish waste;2) and biodiesel waste (BW. 3BW, biodiesel waste;3) was evaluated and compared with sole PM digestion. Results indicated that co-digestion of PM with FW and/or BW is possible as long as ammonium and volatile fatty acids remained under inhibitory levels by adjusting the operating conditions, such as feed composition, organic loading rate (OLR) and hydraulic retention time (HRT). PM and FW co-digestion (90:10 and 95:5, w/w. 4w/w, wet weight basis;4) was possible at OLR of 1-1.5. g COD/L. d, resulting in biogas production rates of 0.4-0.6 L/L. d and COD removal efficiencies of 65-70%. Regarding BW, good results (biogas production of 0.9 L/L. d and COD elimination of 85%) were achieved with less than 5% feeding rate. Overall, operating at the same OLR, the biogas production and methane content in the co-digester was higher than in the only PM digester. © 2012 Elsevier Ltd. Source

Tikhonov R.D.,Technological Center
Solid-State Electronics | Year: 2010

The experimentally discovered effect of the negative sensitivity of a double-collector bipolar magnetotransistor of n-p-n type, of which the base is a diffusion well, is related to the appearance of the volume magnetoconcentration effect at the well-substrate p-n junction. This new effect was investigated with the help of device simulation programs, and it was established that the sensitivity sign of the magnetic field is determined by the distribution of flows of electrons and holes at the well-substrate p-n junction. Furthermore, an analysis of the volume charge modulation of the p-n junction by the magnetic field was conducted. © 2010 Elsevier Ltd. All rights reserved. Source

Perez-Lopez B.,Autonomous University of Barcelona | Perez-Lopez B.,Technological Center | Merkoci A.,Autonomous University of Barcelona | Merkoci A.,Catalan Institution for Research and Advanced Studies
Microchimica Acta | Year: 2012

Nanosized carbon materials are offering great opportunities in various areas of nanotechnology. Carbon nanotubes and graphene, due to their unique mechanical, electronic, chemical, optical and electrochemical properties, represent the most interesting building blocks in various applications where analytical chemistry is of special importance. The possibility of conjugating carbon nanomaterials with biomolecules has received particular attention with respect to the design of chemical sensors and biosensors. This review describes the trends in this field as reported in the last 6 years in (bio)analytical chemistry in general, and in biosensing in particular. © 2012 Springer-Verlag. Source

Torrades F.,Polytechnic University of Catalonia | Garcia-Montano J.,Technological Center
Dyes and Pigments | Year: 2014

This work focuses on the use of Fenton reagent and UV-irradiation, in a lab-scale experiment, for the treatment of real dye wastewater coming from a Spanish textile manufacturer. Response surface methodology and a 23 factorial design were used to evaluate the effects of the three independent variables considered for the optimization of the oxidative process: temperature, Fe (II) and H2O2 concentrations, for a textile wastewater generated during a dyeing process with chemical oxygen demand of 1705 mg L -1 O2 at pH = 3. Wastewater degradation was followed in terms of chemical oxygen demand reduction. In the optimization, the correlation coefficients for the model (R2) were 0.985 and 0.990 for Fenton and photo-Fenton treatments respectively. Optimum reaction conditions at pH = 3 and temperature = 298 K were [H2O2] = 73.5 mM and [Fe(II)] = 1.79 mM. The combination of Fenton, Fenton-like and photon-Fenton reactions has been proved to be highly effective for the treatment of such a type of wastewaters, and several advantages for this technique arise from the study. Under optimum conditions, 120 min of treatment resulted in a 62.9% and 76.3% reduction in chemical oxygen demand after Fenton and photo-Fenton treatments respectively. © 2013 Elsevier Ltd. All rights reserved. Source

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