Vicente González Ruiz

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In this work several different strategies for image compression and progressive transmission are analyzed and evaluated. It will be shown that the simplest wavelet transform (Unitary Sequential Transform, UST) with a spatial predictor (U(S+P)T) followed by the so-called Set Partitioning In Hierarchical Trees (SPIHT) coder is a very good lossless compressor(More)
AIMS In this study, we have evaluated the impact of methodological approaches in the determination of biofilm formation by four clinical isolates of Escherichia coli in static assays. METHODS AND RESULTS The assays were performed in microtitre plates with two minimal and two enriched broths, with one- or two-steps protocol, and using three different(More)
The ability of 15 Escherichia coli strains to form biofilms on polystirene plates was studied. The strains were serotyped, and their phenotypic expression of surface virulence factors (VFs), and antibiotic susceptibility was also determined. Moreover, 30 VFs-associated genes were analysed, including 15 adhesins (papC, papG and its three alleles, sfa/focDE,(More)
The in vitro activity of penicillin, ampicillin, cefditoren, cefotaxime, erythromycin, clarithromycin, and levofloxacin against 763 clinical isolates of Streptococcus pyogenes was determined. Clinically significant isolates collected from November 2005 to December 2006 in the Czech Republic, Slovakia, Hungary, Poland, Romania, Estonia, Latvia, and Lithuania(More)
OBJECTIVES To study the ability of Corynebacterium urealyticum to produce biofilms and to compare the in vitro activity of antimicrobials against planktonic and biofilm-associated organisms. METHODS Biofilm formation on polystyrene plates by three C. urealyticum strains was studied in artificial urine under static conditions. The bactericidal activities(More)
Streptococcus pneumoniae ability to produce biofilms may induce persistent infections and difficulties for eradication in vivo. We investigated the ability of 11 pneumococcal strains (serotypes 3, 6B, 9V, 19F, and 23F) to form biofilms on polystyrene plates at 16 and 24 h. The extent of biofilm was greater at 24 h in 10 strains, being the highest magnitude(More)
Hyperspectral data lossy compression has not yet achieved global acceptance in the remote sensing community, mainly because it is generally perceived that using compressed images may affect the results of posterior processing stages. This possible negative effect, however, has not been accurately characterized so far. In this letter, we quantify the impact(More)
This paper describes and analyzes JPIP-W, an innovative proposal for the interactive transmission of JPEG2000 images on the Internet. JPIP-W is an extension of JPIP, the current JPEG protocol proposed for interactive JPEG2000 image browsing. One of the JPIP characteristics of greatest interest is its ability to use the Web for retrieving images. However,(More)
Aimed to prevent Streptococcus pneumoniae biofilm infections, we studied the adherence of nine pneumococcal strains to polystyrene plates and on epithelial cells and the antiadhesive effect of albumin and xylitol. The adherence was variable among strains, but there was a good correlation between their adherent ability and binding to abiotic material and(More)