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113 results on '"Torrón, C."'

1. New measurements of the transition to the normal state induced by high current densities in high-Tc superconductor microbridges under thermal smallness conditions

Author

Doval, J. M., Maza, J., Torron, C., Veira, J. A., Tello, M., and Vidal, F.

Subjects
Condensed Matter - Superconductivity
Abstract

We address here the superconductivity quenching under an external magnetic field of amplitudes up to 1 T and in the so-called "thermal smallness" condition, when the microbridge width becomes smaller than the thermal diffusion length of both the own superconductor and its refrigerant (the substrate, in the case of thin films), which breaks their thermal dimensional scaling. Our results further support that when the current perturbations have characteristic times in the millisecond range the quenching is due to thermal instabilities associated with regular (nonsingular) flux-flow, and they also suggest how to optimize the refrigeration of practical superconductors., Comment: 8 pages, 2 figures

Published
2014

9. Ranibizumab as treatment for myopic choroidal neovascularization

Author

Torrón, C., Egea, C., Ferrer, E., Ruiz, O., and Honrubia, F.M.

Subjects
Lucentis, genetic structures, Miopía patológica, antiangiogenic, sense organs, antiangiogénicos, ranibizumab, eye diseases, neovascularización, Pathological myopia, neovascularisation
Abstract

Objetivo: Determinar la eficacia de Ranibizumab intravítreo, como tratamiento de la neovascularización coroidea asociada a miopía patológica. Material y métodos: Estudio retrospectivo, no comparativo de 18 ojos tratados con inyecciones intravítreas de Ranibizumab. Diez de los casos se habían tratado previamente con Terapia Fotodinámica, los 8 restantes recibieron Ranibizumab como primera terapia. Tras realizar angiografía fluoesceínica (AGF) y tomografía de coherencia óptica (OCT), se inyectaba ranibizumab, en los controles mensuales posteriores y teniendo en cuenta la agudeza visual (AV), presencia de metamorfopsias, biomicroscopia de polo posterior y características de la OCT se decidía el retratamiento. Resultados: Se analizaron 18 ojos de 16 pacientes, con un seguimiento mínimo de 6 meses. La edad media fue de 56,4 años y el equivalente esférico medio de -13,3 dioptrias. Todas las membranas neovasculares fueron angiográficamente clásicas y de localización sub o yuxtafoveal. La AV mejoró en 14 ojos (77,7%) al menos 1 línea y 11 ojos (61,1%) mejoraron 2 o más líneas a los 6 meses de la inyección, 3 ojos no mostraron cambio (16,6%) y sólo 1 empeoró 1 línea (5,5%). A los 6 meses la AV media mejoró de 0,25 a 0,46 (p = 0,001). La media del espesor macular en la OCT se redujo de 344,9 micras a 212,6 (p = 0,015). Conclusiones: Ranibizumab puede ser una buena opción terapéutica en el tratamiento de la neovascularización miópica, con mejoría visual y anatómica, incluso en pacientes no respondedores a Terapia Fotodinámica. Objective: To evaluate the efficacy of intravitreal Ranibizumab as treatment for choroidal neovascularisation due to pathological myopia. Materials and methods: A retrospective, non-comparative study of 18 eyes treated with intravitreal injections of Ranibizumab. Ten eyes had been treated previously with photodynamic therapy and eight received Ranibizumab as first therapy. After thorough ophthalmologic examination, fluorescein angiography (FAG) and optical coherence tomography (OCT), intraocular injection of Ranibizumab was performed. In subsequent monthly follow ups and taking into account visual acuity, presence or absence of metamorphopsia, biomicroscopy and OCT examination, further treatment was decided. Results: Eighteen eyes from 16 patients were finally included. Patients were followed up for a minimum of 6 months. The mean age at initial treatment was 56.4 years. Mean refractive error was -13.3 diopters. Regarding FAG, all neovascular membranes were classical and sub or juxtafoveal localised. At the end of the sixth month after treatment fourteen eyes (77.7%) showed better visual acuity ranging from one or more lines on the Snellen chart, eleven eyes (61.1%) improved two lines or more, three eyes (16.6%) did not show any change and one eye (5.5%) worsened by one line. At 6 months the mean best-corrected visual acuity improved from 0.25 to 0.46 (p= 0.001). The mean central macular thickness decreased from 344.9 to 212.6 (p=0.015). Conclusions: Ranibizumab may be a good therapeutic option as treatment for choroidal neovascularisation due to pathological myopia; it improved visual acuity and anatomical features, even in non-responders to photodynamic therapy.

Published
2009

10. Terapia fotodinámica en DEP avascular asociado a coriorretinopatía serosa central de larga evolución

Author

Borque, E., Ruiz, O., Torrón, C., Ferrer, E., and Alías, E.

Subjects
tratamiento, photodynamic therapy, chronic central serous chorioretinopathy, treatment, Macula, coriorretinopatía serosa central crónica, case report, Mácula, terapia fotodinámica, caso clínico
Abstract

Objetivo: Describir un caso de coriorretinopatía serosa central asociada a un DEP crónico y el resultado de terapia fotodinámica sobre el mismo. Caso clínico: Se presenta el caso de un hombre de 46 años con coriorretinopatía serosa central crónica de larga evolución (18 meses) con desprendimiento crónico del EPR en su ojo izquierdo que se sometió a tratamiento con terapia fotodinámica con Verteporfin (Visudyne). La AV mejoró de 0,7 a 1, desapareciendo la metamorfopsia en un mes tras el tratamiento. El paciente permaneció asintomático durante un periodo de seguimiento de 15 meses. Discusión: La hiperpermeabilidad coroidea es un factor primario en el desarrollo de la coriorretinopatía serosa central. La terapia fotodinámica con Verteporfin induce una reducción transitoria en el flujo sanguíneo de la coriocapilar y se puede usar como tratamiento en casos de coriorretinopatía serosa central crónica. Purpose: To present a case of long term central serous corioretinopathy associated with chronic detachment of the retinal pigment epithelium (RPE) and the effect of photodynamic therapy on it. Case clinic: We present the case of a 46-year old man with long term chronic central serous chorioretinopathy (18 mo.) with chronic detachment of RPE in his left eye who underwent PDT with Verteporfin (Visudyne). BCVA improved from 0.7 to 1 and metamorphopsia disappeared within one month of treatment. The patient remained asymptomatic for a follow-up period of 15 months. Discussion: Choroidal hyperpermeability is found in central serous chorioretinopathy as a primary involvement factor. PDT with Verteporfin induces a transient reduction in choriocapilaris blood flow and can be used as treatment in cases of chronic central serous chorioretinopathy.

Published
2008

18. Complement Factor H

Author

de la Fuente, M., primary, Blanco, M.J., additional, Pazos, B., additional, Fernández, M.I., additional, Carracedo, A., additional, Sánchez-Salorio, M., additional, Coco, R.M., additional, Torrón, C., additional, and Gómez, A.M., additional

Published
2007
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43. Thermal fluctuation effects on the magnetization above and below the superconducting transition in Bi2Sr2CaCu2O8 and YBa2Cu3O7−δ crystals in the weak magnetic field limit

Author

Mosqueira, J., Ramallo, M. V., Pomar, A., Torrón, C., and Vidal, Félix

Abstract

We present detailed experimental data of the magnetization, Mab(T,H), of Bi2Sr2CaCu2O8 and YBa2Cu3O7-d crystals on both sides of the superconducting transition, for magnetic fields, H, applied perpendicularly to the ab (CuO2) planes. The data are analyzed in terms of thermal fluctuations in the weak H limit: In the reversible mixed state below the transition, by taking into account the vortex fluctuations, as first proposed by Bulaevskii, Ledvij and Kogan, which are much more important in the Bi-based compounds. Above the transition, by taking into account the order parameter amplitude fluctuations (OPF), through a generalization to multilayered superconductors of the Schmidt-like approach.

Published
1996
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