Browsing by Author "Aguirre, J."
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- ItemA new multiplex PCR assay for the simultaneous detection of vancomycin-resistant enterococci from rectal swabs(2010) Benadof, D.; San Martín, M.; Aguirre, J.; Paredes, L.; Malig, R.; Melo Ledermann, Francisco Javier; Lehouque, G.Objectives This study describes the diagnostic performance of a recently available multiplex PCR-based kit for the simultaneous detection and identification of Enterococcus faecium, Enterococcus faecalis, vanA, vanB, vanC1 and vanC2/C3 genes, directly from rectal swabs constituting the most complete existing molecular assay currently available. Methods The diagnostic performance of this assay was evaluated by a multicenter study involving three independent public hospitals and consisted in the analysis of 187 rectal swabs from patients at high risk for vancomycin-resistant enterococci colonization. Results When bacteria culture was used as the gold standard, the sensitivity, specificity, positive and negative predicted values for the assay were 96.8%, 76.0%, 67.7% and 97.9%, respectively. When a composite reference standard consisting of culture and DNA sequencing of PCR products was used as the gold standard, the sensitivity, specificity, positive and negative predicted values for the PCR-based assay were 97.8%, 96.9%, 96.7% and 97.9%, respectively. Conclusions Based on these results, we conclude that this assay is considerably more sensitive than traditional microbiological methods for detecting vancomycin-resistant enterococci from rectal swabs. It is also much faster than culture. We believe that the implementation of this assay in routine clinical laboratories could help to reduce hospital-acquired vancomycin-resistant enterococci infections.
- ItemAnti-N-methyl-D-aspartate receptor and anti-ribosomal-P autoantibodies contribute to cognitive dysfunction in systemic lupus erythematosus(2015) Massardo Vega, Loreto; Bravo Zehnder, Marcela; Calderón, J.; Flores, P.; Padilla Pérez, Oslando; Aguirre, J.; Scoriels, L.; González, A.
- ItemApplication of FFT analysis for the study of directionality of wear scars in exposure to slurry flow of varying velocity(2019) Molina Vergara, Nicolas Andres; Aguirre, J.; Walczak, Magdalena MartaThe fast Fourier transform (FFT) has been used extensively in image processing for analyzing periodicity, directionality, and spacing in pattern recognition. This paper describes a procedure for applying FFT technique to images of worn surfaces produced by erosion typical to transport of slurry through tailing pipelines. Rotating cylinder electrode is used for simulating exposure of carbon steel API 5L X65 to flow of different nominal velocities under cathodic protection. Degradation is evaluated by weight loss; whereas the worn surfaces are assessed by scanning electron microscope (SEM). FFT-based analysis of the SEM images reveals that directionality of wear scars evolves with increasing velocity indicating a correlation between erosion wear rate and the condition of the turbulent flow.
- ItemCorrosion behavior of stainless steel AISI 470 in pacific seawater(2015) Aguirre, J.; Walczak, M.; Armijo, F.; Daille, L.; Fischer, D.; Galarce, C.; De La Iglesia, R.; Pizarro, G.; Vargas Cucurella, Ignacio Tomas
- ItemDamage potential reduction of optimally passive-controlled nonlinear structures(2015) Aguirre, J.; Almazán Campillay, José Luis
- ItemEffect of dissolved copper ions on erosion-corrosion synergy of X65 steel in simulated copper tailing slurry(2017) Aguirre, J.; Walczak, Magdalena
- ItemImpact of cognitive impairment, depression, disease activity, and disease damage on quality of life in women with systemic lupus erythematosus(2017) Calderón, J.; Flores, P.; Aguirre, J.; Valdivia Cabrera, Gonzalo; Padilla, O.; Barra, I.; Iscoriels, L.; Herrera, S.; González Arellano, Alejandro; Massardo Vega, Loreto
- ItemOptimal control of linear and nonlinear asymmetric structures by means of passive energy dampers(2013) Aguirre, J.; Almazán Campillay, José Luis; Paul, C.
- ItemPoly(3,4-ethylenedioxythiophene) used as a coating on stainless steel AISI 470. Evaluation of corrosion inhibition performance(2015) Aguirre, J.; Armijo, F.; Walczak, M.; De La Iglesia, R.; Pizarro, G.; Vargas Cucurella, Ignacio Tomas
- ItemThe Simons Observatory : science goals and forecasts(2019) Ade, P,; Aguirre, J.; Ahmed, Z.; Aiola, S.; Ali, A.; Alonso, D.; Alvarez, M.A.; Boettger, David; Maurin, Loïc Benjamin; Fluxá Rojas, Pedro Antonio