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Search Results: 1 - 10 of 7550 matches for " Marta; Orden "
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Actinomicosis ureteral: A propósito de un caso
Rubio Tortosa,Ignacio; Sanchez Sanchis,Manuel; Coronel Sánchez,Belén; Garcia Serrado,Diego; Garcia Torrelles,Marta; Vergés Prosper,Aleixandre; San Juan De La Orden,Carlos;
Archivos Espa?oles de Urología (Ed. impresa) , 2005, DOI: 10.4321/S0004-06142005000400011
Abstract: objectives: to report one case of pseudotumoral lesion of the iliac ureter with obstructive uropathy leading to loss of function of the renal unit. methods: 66-year-old male being studied for bph who presents with a self-limited monosymptomatic hematuria. results: renal ultrasound detected grade ii pyelocaliectasis of the right kidney. ivu showed absence of function of the right kidney. urine cytology was consistent with low-grade transitional cell carcinoma. percutaneous nephrostomy was performed confirming irreversible function loss. antegrade pyelography showed a filling defect in the right iliac ureter. radical nephroureterectomy with bladder cuff was carried out with good results. pathology reported chronic pyelonephritis and parietal inflammatory lesion of the ureter obliterating the lumen with inflammatory infiltrates, urothelial erosion and presence of actinomyces. conclusions: actinomycosis is a chronic bacterial infection, with a. israeli being the most common pathogen. it is part of the normal flora of the oral cavity and gi tract, and cervical-facial region is the most frequent clinical involvement (60% of the cases). urinary tract infection is exceptional. no other focus was found in the long-term follow-up.
Tumor fibroso solitario de la túnica vaginal
García Torrelles,Marta; Beltrán Armada,Jose Ramón; Santolaya García,Ignacio; Carrascosa Lloret,Víctor; Tarín Planes,Miguel; San Juan de la Orden,Carlos;
Archivos Espa?oles de Urología (Ed. impresa) , 2006, DOI: 10.4321/S0004-06142006000200011
Abstract: objectives: we report one case of solitary fibrous tumor of the tunica vaginalis, a benign paratesticular lesion. methods: surgical exploration with intraoperative biopsy and excision of the lesion was undertaken, leaving the testicle and epididymis undamaged. results: intraoperative biopsy revealed the presence of fibrous tissue without malignant cellularity. pathological diagnosis on the surgical specimen was solitary fibrous tumor of the tunica vaginalis. the patient remains asymptomatic and disease-free one year after treatment. conclusions: almost all testicular masses are malignant, but in order to avoid a non-indicated orchyectomy, one should be cautious with the finding of a paratesticular lesion of probable benign nature on ultrasound or during surgery.
p16 gene methylation in colorectal cancer patients with long-term follow-up Metilación de p16 en pacientes intervenidos de cáncer colorrectal tras un largo periodo de seguimiento
Silvia Veganzones-de-Castro,Sara Rafael-Fernández,Marta Vidaurreta-Lázaro,Virginia de-la Orden
Revista Espa?ola de Enfermedades Digestivas , 2012,
Abstract: Introduction: p16 gene plays an important role in the cell cycle regulation and is considered an important tumor suppressor gene. Several mechanisms of gene inactivation have been described; in this study we have focused on p16 gene promoter methylation. In colorectal cancer p16 gene methylation is a frequent event. Methods: 326 patients with sporadic colorectal cancer were included. DNA was extracted from tumor tissue samples obtained during the surgical procedure. Promoter methylation was analyzed using bisulfite modification and was detected by quantitative methylation-specific PCR. Frequency of p16 methylation was analyzed and compared with other clinicopathological variables. Results: p16 gene methylation was detected in 24,8% of patients. Methylation was associated with differentiation grade and with tumor location: methylation was frequent in poorly differentiated tumors and had low frequency in distal colon. The p16 promoter methylation discriminated a subgroup of patients with better prognosis in poorly differentiated tumors. Conclusions: p16 methylation was a frequent event in our population and was able to induce differences in the overall survival of patients with poorly differentiated tumors. Introducción: el gen p16 está implicado en la regulación del ciclo celular y se considera un importante gen supresor de tumores. Objetivos: se han descrito diferentes mecanismos de inactivación génica, en este estudio nos hemos centrado en la metilación del promotor del gen p16. En el cáncer colorrectal la metilación de p16 es una alteración frecuente. Material y métodos: se incluyeron 326 pacientes con cáncer colorrectal esporádico. El ADN se extrajo de muestras tumorales obtenidas durante la cirugía. La metilación del promotor se analizó mediante un proceso de modificación con bisulfito y posterior PCR cuantitativa especifica para metilación. Se analizó la frecuencia de la metilación de p16 y se comparó con las variables clinicopatológicas. Resultados: la metilación del gen p16 se detectó en el 24,8% de los pacientes. La metilación de p16 se relacionó con el grado de diferenciación y con la localización tumoral: la metilación fue mas frecuente en los tumores pobremente diferenciados y tuvo una baja frecuencia en el colon distal. La metilación del promotor de p16 discrimina un subgrupo de pacientes con mejor pronóstico en los tumores pobremente diferenciados. Conclusiones: la metilación de p16 es un evento frecuente en nuestra población y es capaz de inducir diferencias en la supervivencia global de los pacientes con tumores moderadamente diferenciado
Hipótesis: una vía alternativa de regulación de procesos inflamatorios: De la hormesis y la inflamación
Alberto O. Orden
Medicina (Buenos Aires) , 2005,
Abstract:
Conserved electromagnetic currents in a relativistic optical model
J. W. Van~Orden
Physics , 2006, DOI: 10.1103/PhysRevC.74.034607
Abstract: A simple model of a relativistic optical model is constructed by reducing the three-body Bethe-Salpeter equation to an effective two-body optical model. A corresponding effective current is derived for use with the optical-model wave functions. It is shown that this current satisfies a Ward-Takahashi identity involving the optical potential which results in conserved current matrix elements.
Asymptotically efficient triangulations of the d-cube
David Orden,Francisco Santos
Mathematics , 2002, DOI: 10.1007/s00454-003-2845-5
Abstract: Let $P$ and $Q$ be polytopes, the first of "low" dimension and the second of "high" dimension. We show how to triangulate the product $P \times Q$ efficiently (i.e., with few simplices) starting with a given triangulation of $Q$. Our method has a computational part, where we need to compute an efficient triangulation of $P \times \Delta^m$, for a (small) natural number $m$ of our choice. $\Delta^m$ denotes the $m$-simplex. Our procedure can be applied to obtain (asymptotically) efficient triangulations of the cube $I^n$: We decompose $I^n = I^k \times I^{n-k}$, for a small $k$. Then we recursively assume we have obtained an efficient triangulation of the second factor and use our method to triangulate the product. The outcome is that using $k=3$ and $m=2$, we can triangulate $I^n$ with $O(0.816^{n} n!)$ simplices, instead of the $O(0.840^{n} n!)$ achievable before.
The polytope of non-crossing graphs on a planar point set
David Orden,Francisco Santos
Mathematics , 2003, DOI: 10.1007/s00454-004-1143-1
Abstract: For any finite set $\A$ of $n$ points in $\R^2$, we define a $(3n-3)$-dimensional simple polyhedron whose face poset is isomorphic to the poset of ``non-crossing marked graphs'' with vertex set $\A$, where a marked graph is defined as a geometric graph together with a subset of its vertices. The poset of non-crossing graphs on $\A$ appears as the complement of the star of a face in that polyhedron. The polyhedron has a unique maximal bounded face, of dimension $2n_i +n -3$ where $n_i$ is the number of points of $\A$ in the interior of $\conv(\A)$. The vertices of this polytope are all the pseudo-triangulations of $\A$, and the edges are flips of two types: the traditional diagonal flips (in pseudo-triangulations) and the removal or insertion of a single edge. As a by-product of our construction we prove that all pseudo-triangulations are infinitesimally rigid graphs.
p16 gene methylation in colorectal cancer patients with long-term follow-up
Veganzones-de-Castro,Silvia; Rafael-Fernández,Sara; Vidaurreta-Lázaro,Marta; Orden,Virginia de-la; Mediero-Valeros,Beatriz; Fernández,Cristina; Maestro-de las Casas,María Luisa;
Revista Espa?ola de Enfermedades Digestivas , 2012, DOI: 10.4321/S1130-01082012000300002
Abstract: introduction: p16 gene plays an important role in the cell cycle regulation and is considered an important tumor suppressor gene. several mechanisms of gene inactivation have been described; in this study we have focused on p16 gene promoter methylation. in colorectal cancer p16 gene methylation is a frequent event. methods: 326 patients with sporadic colorectal cancer were included. dna was extracted from tumor tissue samples obtained during the surgical procedure. promoter methylation was analyzed using bisulfite modification and was detected by quantitative methylation-specific pcr. frequency of p16 methylation was analyzed and compared with other clinicopathological variables. results: p16 gene methylation was detected in 24,8% of patients. methylation was associated with differentiation grade and with tumor location: methylation was frequent in poorly differentiated tumors and had low frequency in distal colon. the p16 promoter methylation discriminated a subgroup of patients with better prognosis in poorly differentiated tumors. conclusions: p16 methylation was a frequent event in our population and was able to induce differences in the overall survival of patients with poorly differentiated tumors.
Herramientas de Screening del Desarrollo Psicomotor en Latinoamérica
VERICAT,AGUSTINA; ORDEN,ALICIA B;
Revista chilena de pediatría , 2010, DOI: 10.4067/S0370-41062010000500002
Abstract: primary care physicians play an important role in detecting psychomotor development problems. there are a number of useful tools available for this purpose. this paper provides a review of the literature of some methods utilized in latin america, with special emphasis on screening tools. a follow up protocol for patients with developmental delay is suggested in order to simplify the diagnostic process. finally, a few hurdles in implementation of developmental control are pointed out.
Reflexiones en torno a las competencias como objeto de evaluación en el ámbito educativo
Orden Hoz, Arturo de la;
Revista electrónica de investigación educativa , 2011,
Abstract: ensuring a positive impact of assessment on competency based education (cbe) requires, obviously, an educationally valid assessment system. it is therefore necessary that competency be specified and defined as an object of assessment. following a review of the relevant literature, this article presents two conceptions of competency: 1) competency as effective and efficient performance of a function or role in a given area, and 2) competency as an integrated combination of knowledge, abilities, skills and attitudes. the first conception of competency calls for a more holistic evaluation model, which is to say a comprehensive appraisal of competency, rather than an analytical assessment of its requirements. with regard to the second conception of competency, a theoretically adequate model is the one known as performance assessment. the article concludes with a reference to advanced models of performance assessment and to their design structure, closing with a brief allusion to the validation of competency assessment systems.
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