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Search Results: 1 - 10 of 593552 matches for " M. J. Legaz "
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On a Family of High-Order Iterative Methods under Kantorovich Conditions and Some Applications
S. Amat,C. Bermúdez,S. Busquier,M. J. Legaz,S. Plaza
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/782170
Abstract: This paper is devoted to the study of a class of high-order iterativemethods for nonlinear equations on Banach spaces. An analysis ofthe convergence under Kantorovich-type conditions is proposed. Somenumerical experiments, where the analyzed methods present better behaviorthan some classical schemes, are presented. These applicationsinclude the approximation of some quadratic and integral equations.
Effect of cyclic AMP and acridine orange on the enzymatic reduction of usnic acid in the lichen Usnea aurantiaco-atra (Jacq.) Bory
C. Vicente,Mercedes M. Pedrosa,J. L. Mateos,Maria E. Legaz
Acta Societatis Botanicorum Poloniae , 1995, DOI: 10.5586/asbp.1995.038
Abstract: A fluorescence-detection HPLC procedure has been applied to identify and quantify acridine orange in lichen samples. The dye accumulates in thalli of the lichen Usnea aurantiaco-atra and, in part, it is recovered from protamine-precipitated nucleic acids extracted from the samples. A supply of exogenous cyclic AMP reverses the uptake of acridine orange by thallus samples and its binding to nucleic acids. The dye impedes neither the loss of endogenously-produced cyclic AMP by thallus samples nor inhibits the uptake of that exogenously supplied. However, part of the endogenously produced cyclic AMP is secreted to the incubation medium in which phosphodiesterase activity has never been detected. Since the synthesis of D-usnic acid: NAD+(H) oxido-reductase is impeded by acridine orange, oxidative catabolism of usnic acid is inhibited in thalli floated on the dye. Cyclic AMP reverses this effect.
Neuromodulación de raíces sacras como tratamiento de la incontinencia fecal: Resultados preliminares
Navarro,J. M.; Arroyo Sebastián,A.; Pérez Vicente,F.; Sánchez Romero,A. M.; Pérez Legaz,J.; Serrano Paz,P.; Fernández Frías,A. M.; Candela Polo,F.; Calpena Rico,R.;
Revista Espa?ola de Enfermedades Digestivas , 2007, DOI: 10.4321/S1130-01082007001100003
Abstract: we present our initial experience in the treatment of fecal incontinence (fi) with sacral root neuromodulation (srn) by reporting the results of a prospective study with 26 patients where baseline wexner-cleveland scale scores and ability to delay defecation were compard to results after one year with srn. the initial study of patients included history taking, general examination, anal ultrasonography, and manometry, and a three-week diary of continence and quality of life specific for fi was used. before srn the mean baseline wexner-cleveland score was 15.00 ± 1.81, and 62.50% of patients could only delay defecation for less than a minute. after a year with nrs the mean wexner-cleveland score was 4.87 ± 2.54 (p = 0.0031), and 75.01% of patients could delay defecation above fifteen minutes (p = 0.0018). we also describe the surgical technique and its indications, and finally review the various therapeutical options for fi and show our algorithm for this condition. srn is an effective technique for the treatment of fi in properly selected patients with no response to medical therapies (including biofeedback) or anatomic correction (sphincteroplasty), with efficacy, little morbidity, and a short hospital stay.
Characterization of Lipschitz continuous DC functions
A. Hantoute,J. E. Martínez-Legaz
Mathematics , 2012,
Abstract: We give a necessary and sufficient condition for a difference of convex (DC, for short) functions, defined on a locally convex space, to be Lipschitz continuous. Our criterion relies on the intersections of the "epsilon-subdifferentials of the involved functions.
Esophagoenteral stents in patients with recurrent gastric adenocarcinoma
Pérez-Roldán,F.; González-Carro,P.; Legaz-Huidobro,M.; Oruezabal-Moreno,M.; Soto Fernández,S.; Roncero García-Escribano,O.; Pedro Esteban,A. de; Ruiz-Carrillo,F.; Seoane-González,J.;
Revista Espa?ola de Enfermedades Digestivas , 2006, DOI: 10.4321/S1130-01082006000500004
Abstract: one of the problems that can appear in patients with total gastrectomy for adenocarcinoma with esophagoenteral anastomosis is the appearance of a stenosis of the anastomosis. these stenosis are frequently malignant due to relapse of neoplasia. the therapeutic possibilities available are the surgical bypass or palliative treatment. there is very little experience described in the literature (21 cases) on the placing of self-expandable metal stents as a palliative treatment for the symptoms of stenosis. we present our experience of 3 patients, in whom 4 esophageal stents were fitted (1 covered and 3 uncovered) with good results. the dysphagia disappeared or improved, it allowed the ingestion of a soft diet and meant an improvement in the quality of life and at the same time stopped the weight loss. it seems an effective palliative treatment as a treatment for dysphagia in patients with tumoral relapse in the anastomosis of total gastrectomies.
Analysis of 13000 unique Citrus clusters associated with fruit quality, production and salinity tolerance
Javier Terol, Ana Conesa, Jose M Colmenero, Manuel Cercos, Francisco Tadeo, Javier Agustí, Enriqueta Alós, Fernando Andres, Guillermo Soler, Javier Brumos, Domingo J Iglesias, Stefan G?tz, Francisco Legaz, Xavier Argout, Brigitte Courtois, Patrick Ollitrault, Carole Dossat, Patrick Wincker, Raphael Morillon, Manuel Talon
BMC Genomics , 2007, DOI: 10.1186/1471-2164-8-31
Abstract: A normalized full length and 9 standard cDNA libraries were generated, representing particular treatments and tissues from selected varieties (Citrus clementina and C. sinensis) and rootstocks (C. reshni, and C. sinenis × Poncirus trifoliata) differing in fruit quality, resistance to abscission, and tolerance to salinity. The goal of this work was to provide a large expressed sequence tag (EST) collection enriched with transcripts related to these well appreciated agronomical traits. Towards this end, more than 54000 ESTs derived from these libraries were analyzed and annotated. Assembly of 52626 useful sequences generated 15664 putative transcription units distributed in 7120 contigs, and 8544 singletons. BLAST annotation produced significant hits for more than 80% of the hypothetical transcription units and suggested that 647 of these might be Citrus specific unigenes. The unigene set, composed of ~13000 putative different transcripts, including more than 5000 novel Citrus genes, was assigned with putative functions based on similarity, GO annotations and protein domainsComparative genomics with Arabidopsis revealed the presence of putative conserved orthologs and single copy genes in Citrus and also the occurrence of both gene duplication events and increased number of genes for specific pathways. In addition, phylogenetic analysis performed on the ammonium transporter family and glycosyl transferase family 20 suggested the existence of Citrus paralogs. Analysis of the Citrus gene space showed that the most important metabolic pathways known to affect fruit quality were represented in the unigene set. Overall, the similarity analyses indicated that the sequences of the genes belonging to these varieties and rootstocks were essentially identical, suggesting that the differential behaviour of these species cannot be attributed to major sequence divergences. This Citrus EST assembly contributes both crucial information to discover genes of agronomical interest and t
New results on q-positivity
Y. García Ramos,J. E. Martínez-Legaz,S. Simons
Mathematics , 2011, DOI: 10.1007/s11117-012-0191-7
Abstract: In this paper we discuss symmetrically self-dual spaces, which are simply real vector spaces with a symmetric bilinear form. Certain subsets of the space will be called q-positive, where q is the quadratic form induced by the original bilinear form. The notion of q-positivity generalizes the classical notion of the monotonicity of a subset of a product of a Banach space and its dual. Maximal q-positivity then generalizes maximal monotonicity. We discuss concepts generalizing the representations of monotone sets by convex functions, as well as the number of maximally q-positive extensions of a q-positive set. We also discuss symmetrically self-dual Banach spaces, in which we add a Banach space structure, giving new characterizations of maximal q-positivity. The paper finishes with two new examples.
A first attempt to elucidate the amino acid sequence of some lichen lectins
Sacristán,M; Millanes,Am; Fontaniella,B; Legaz,Me; Vicente,C;
Phyton (Buenos Aires) , 2008,
Abstract: secreted arginases from evernia prunastri and xanthoria parietina thalli, exhibiting lectin activity, have been purified to homogeneity. analyses of both amino acid and glycoside composition are reported. purified proteins have been subjected to tryptic digestion and some amino acid sequences have been analyzed. an undecapeptide from evernia arginase, which shows some degree of homology with the domain to which mn2+ binds, a heptapeptide and an undecapeptide from xanthoria arginase have been analyzed, and homologies with some arginases from other fungi and plants have been found.
Enfermedad de Castleman multicéntrica: hallazgos ecoendoscópicos Multicentric Castleman disease: Endoscopic ultrasonographic findings
M. L. Legaz Huidobro,A. de Pedro Esteban,P. González Carro,S. Soto Fernández
Revista Espa?ola de Enfermedades Digestivas , 2007,
COAR: Combining Arc flag with Reach based method for shortest path computation
Thangalatha legaz.C
International Journal of Computer Technology and Applications , 2012,
Abstract: In general shortest path computation from onenode to another in a directed graph is a verycommon task. This problem is fundamentally solvedby the Dijkstra algorithm. There are manytechniques available to speed up the originalDijkstra’s algorithm heuristically. Even then theoptimality of the solution can still be guaranteed.In this project, the various combinations of speeduptechniques are studied and analyzed. By analyzingthe advantages of the arc flag method and reachbased method, the combination of the arc flag andthe reach based method provides better speed upthan the previous combinations and therefore weimprove the speedup of shortest path queries usingthis combination. The main focus of the work is toimplement the combination of Arc flag and Reachbased method to improve the speedup of shortestpath queries. The experimental results werecompared and analyzed for determining betterperformance improvements in random graphs andplanar graphs. The road network for South Indiawith the distance values between districts inTamilnadu are also tested using arcflag method,reach based method and COAR.
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