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Search Results: 1 - 10 of 248088 matches for " Juan C.;Badano "
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Evaluación del da o estructural de manos mediante RM en pacientes con artritis reumatoidea temprana, sin evidencia de erosiones radiográficas Assessment of structural damage of hands by MRI in patients with early rheumatoid arthritis, without evidence of erosions in radiography
Juan C. Spina (h),Silvina Dutruel,Osvaldo Colombo,Federico Badano
Revista Argentina de Radiología , 2009,
Abstract: Introducción: La Artritis Reumatoidea (AR) se caracteriza por la inflamación crónica de las articulaciones, lo que lleva a la destrucción del cartílago articular y del hueso. Aproximadamente el 75% de los pacientes con AR desarrolla erosiones articulares dentro de los dos primeros a os de comienzo de los síntomas. La presencia de erosiones tempranas expresa enfermedad más agresiva y se asocia a un pronóstico más desfavorable. Se ha demostrado que el da o erosivo puede observarse en resonancia magnética (RM) aun antes de los 6 meses luego de iniciada la enfermedad, siendo esta técnica de mayor sensibilidad que la radiología convencional. La evaluación por RM utilizando el score de Outcome Measures in Rheumatology Clinical Trials (OMERACT) / Rheumatoid Arthritis Magnetic Resonance Imaging Score (RAMRIS) permite realizar una valoración semicuantitativa del edema óseo, la sinovitis y las erosiones. Objetivo: Evaluar las características del da o estructural por RM en pacientes con AR temprana (menos de un a o de evolución) que no presentaron erosiones en radiografías de manos. Materiales y métodos: Se seleccionaron 10 pacientes con AR según criterios ACR 1987, que presentaban score radiológico de Sharp / van der Heijde igual a 0 (cero) para erosiones. A ellos se les realizó RM de ambas manos. Se utilizó el score de Sharp / van der Heijde para evaluar el pinzamiento articular y el score de OMERACT-RAMRIS para cuantificar las lesiones articulares detectadas por RM. Se comparó el score final obtenido por ambos métodos. Resultados: Se incluyeron 10 pacientes (9 mujeres y 1 varón) con score radiológico de Sharp / van der Heijde igual a cero para erosiones. La edad media fue de 45,8 a os (rango 25 - 71). El tiempo medio de evolución de la AR a la obtención de las imágenes fue de 3,6 meses (rango 1 - 8). El score medio de pinzamiento radiológico fue de 52 (rango 36 - 83). El score medio OMERACT-RAMRIS fue de 24 (rango 4-55); todos los pacientes presentaron sinovitis y 7 (70 %), edema óseo. Apesar de no observarse erosiones en la radiografía, 7 pacientes (70 %) las mostraron en RM. La erosión representó el 26,25% del score total de RM. Conclusión: Tradicionalmente, el da o estructural de la AR se mide utilizando diferentes métodos de score radiológicos. Dado que la detección precoz de erosiones predice una enfermedad más agresiva, la RM debería ser considerada en pacientes con AR temprana para la evaluación del pronóstico. Sin embargo, es necesario evaluar a un mayor número de pacientes para certificar esta observación. Introduction: Rheumatoid Arthritis (RA) is char
Evaluación del da?o estructural de manos mediante RM en pacientes con artritis reumatoidea temprana, sin evidencia de erosiones radiográficas
Spina (h),Juan C.; Dutruel,Silvina; Colombo,Osvaldo; Badano,Federico; Aliaga,Leandro; Barreira,Juan C.;
Revista argentina de radiolog?-a , 2009,
Abstract: introduction: rheumatoid arthritis (ra) is characterized by chronic inflammation of the joints, leading to destruction of articular cartilage and bone. approximately 75% of ra patients develop joint erosions within the first two years of onset of symptoms. the presence of early erosions reveals more aggressive disease and is associated with an unfavorable prognosis. it has been shown that erosion damage can be seen on magnetic resonance imaging (mri) even before 6 months of the disease onset. this technique appears to be more sensitive than conventional radiology. mri evaluation using the score of outcome measures in rheumatology clinical trials (omeract) / rheumatoid arthritis magnetic resonance imaging score (ramris) allows semiquantitative assessment of bone edema, synovitis and erosions. objective: to evaluate the characteristics of structural damage by mri in patients with early ra (less than one year of progression), with no erosions of hands on the x-ray. materials and methods: we selected 10 patients with ra according to the acr criteria 1987, whose score showed radiographic sharp / van der heijde equal to 0 (zero) for erosions. they underwent mri of both hands. the sharp / van der heijde method was used to assess articular impingement, and the omeract-ramris score to quantify joint lesions detected by mri. the final scores obtained by both methods were compared. results: ten patients (9 females and 1 male) with radiographic score sharp / van der heijde zero for erosion were included. mean age was 45.8 years (range 25-71). when the mri was performed, the mean time of ra progression was 3.6 months (range 1 to 8). the average score was 52 radiological clamping (range 36 to 83). the omeract-ramris half score was 24 (range 4- 55); all patients had synovitis, and 7 (70%) had bone edema. although no erosions have been seen on radiographs, in 7 patients (70%) erosions were seen on the mri. erosions accounted for 26.25% of the total mri score. conclusion: traditiona
Espacios aéreos pulmonares anormales por TCAR
Spina (h),Juan Carlos; Medina,Josefina; Cúneo,Lucrecia; Badano,Federico; Bambaci,Florencia; Spina,Juan Carlos;
Revista argentina de radiolog?-a , 2008,
Abstract: objetive: the purpose of this paper is to review and give some clues for the diagnosis of the many entities that present as abnormal air spaces at hrct. materials and methods: we retrospectively reviewed the archives of hrct of our institution with diagnosis of different entities that presented with abnormal air spaces. in all cases we evaluated the location, number (unique o multiple), parietal thickness and concomitant compromise of parenchyma or mediastinum and we clustered them by their association with different illness. results: considering the characteristics in hrct we grouped the abnormal air spaces in: infectious process (tuberculosis, pneumocistis jiroveci pneumonia, aspergillosis, hydatidosis, cavitated pneumonia, lung abscess and pneumatocele; entities that present with bronchiectasias (cystic fibrosis, kartagener syndrome, allergic bronchopulmonary aspergillosis), pulmonary vasculitis (wegener granulomatosis and rheumatoid arthritis); emphysema; metastasis, primary tumors (epidermoid carcinoma and bronchioalveolar carcinoma) and others (lymphangioleiomyomatosis, langerhans cell histiocytosis, pulmonary sequestration and cystic adenomatoid malformation) conclusion: the presence of abnormal air spaces in hrct is very usual. if we know certain characteristics of them, we could get a provable diagnosis in almost all cases.
H3PW12O40 (HPA), an efficient and reusable catalyst for biodiesel production related reactions: esterification of oleic acid and etherification of glycerol
Sepúlveda, Jorge H.;Vera, Carlos R.;Yori, Juan C.;Badano, Juan M.;Santarosa, Daniel;Mandelli, Dalmo;
Química Nova , 2011, DOI: 10.1590/S0100-40422011000400009
Abstract: in esterification of oleic acid with methanol at 25 °c hpa displayed the highest activity. moreover the hpa could be reused after being transformed into its cesium salt. in the reaction of etherification of glycerol hpa and amberlyst 35w showed similar initial activity levels. the results of acid properties demonstrate that hpa is a strong protonic acid and that both surface and bulk protons contribute to the acidity. because of its strong affinity for polar compounds, hpa is also seemingly dissolved in both oleic acid and methanol. the reaction in this case proceeds with the catalyst in the homogenous phase.
Influence of ni addition to a low-loaded palladium catalyst on the selective hydrogenation of 1-heptyne
Lederhos, Cecilia R.;Badano, Juan M.;Quiroga, Mónica E.;L'Argentière, Pablo C.;Coloma-Pascual, Fernando;
Química Nova , 2010, DOI: 10.1590/S0100-40422010000400010
Abstract: semi-hydrogenation of alkynes has industrial and academic relevance on a large scale. to increase the activity, selectivity and lifetime of monometallic catalysts, the development of bimetallic catalysts has been investigated. 1-heptyne hydrogenation over low-loaded pd and ni monometallic and pdni bimetallic catalysts was studied in liquid phase at mild conditions. xps results suggest that nickel addition to pd modifies the electronic state of palladium as nickel loading is increased. low-loaded pd catalysts showed the highest selectivities (> 95%). the most active prepared catalyst, pdni(1%), was more selective than the lindlar catalyst.
Tumor germinal no seminomatoso del mediastino con invasión pulmonar
Cúneo,Lucrecia; Dutruel,Silvina P; Cellerino,Analía V; Salazar Cottone,Santiago N; Badano,Federico; Maio,Gabriel; Spina,Juan Carlos;
Revista argentina de radiolog?-a , 2008,
Abstract: the prevalence of extragonadal germ cell tumors is only 1- 2.5% of all germ cell tumors. the mediastinum is the second most common site affected. we present the case of a 29 years old male pacient, with a persistent cough dating back to five months. we performed chest x-r, thorax ct and mri and testicular us. the findings of this images besides the presence of elevated levels of alpha-fetoprotein and beta-human gonadotropin confirm the diagnosis of extragonadal germ cell tumor.
Asociaciones de especies a plantas en cojín: sus consecuencias sobre la diversidad de especies vegetales en comunidades alto-Andinas
E. Badano
Ecosistemas , 2006,
Abstract:
Signo del Yin-Yang
Federico Badano
Revista Argentina de Radiología , 2010,
Abstract:
Activity and sulfur resistance of Rh(I) and Pd(II) complexes
Rivas, Ivana;Badano, Juan;Lederhos, Cecilia;Liprandi, Domingo;Cagnola, Edgardo;Vera, Carlos;Quiroga, Mónica;
Química Nova , 2011, DOI: 10.1590/S0100-40422011000100017
Abstract: two complexes of rh(i) and pd(ii) with chloride and tridecylamine ligands were obtained and characterized by elementary analysis and by xps and ftir spectroscopies. complexes anchored on γ-al2o3 were tested in the styrene semi-hydrogenation reaction carried out in the absence or presence of a sulfur poison. although both low loaded catalysts were highly selective, the pd(ii) complex was three times more active than the rh(i) complex. the rhodium complex was more sulfur resistant but less active than the palladium complex. differences in conversion and sulfur resistance between both complexes could be related to electronic and/or geometric effects.
Low metal loading catalysts used for the selective hydrogenation of styrene
Badano, Juan;Lederhos, Cecilia;Quiroga, Mónica;L'Argentière, Pablo;Coloma-Pascual, Fernando;
Química Nova , 2010, DOI: 10.1590/S0100-40422010000100010
Abstract: a series of group viii metal catalysts was obtained for the semi-hydrogenation of styrene. catalysts were characterized by hydrogen chemisorption, tpr and xps. palladium, rhodium and platinum low metal loading prepared catalysts presented high activity and selectivity (ca. 98%) during the semi-hydrogenation of styrene, being palladium the most active catalyst. the ruthenium catalyst also presented high selectivity (ca. 98%), but the lowest activity. for the palladium catalyst, the influence of the precursor salt and of the reduction temperature on the activity and selectivity were studied. the following activity series was obtained: pdn-423 > pdcl-673 > pdcl-373> ptcl-673 > rhcl-673 >> rucl-673. as determined by xps, differences in activity could be attributed, at least in part, to electronic effects.
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