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Search Results: 1 - 10 of 285037 matches for " José Alfredo;Lazo-Cárdenas "
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Cierre transcatéter del conducto arterioso permeable con coils de liberación controlada: Resultados inmediatos y seguimiento a mediano plazo
Parra-Bravo, José Rafael;Acosta-Valdez, José Luis;Girón-Vargas, Ana Luisa;Beirana-Palencia, Luisa Gracia;Rodríguez-Hernández, Lydia;Estrada-Loza, María de Jesús;Galicia-Galicia, José Alfredo;Lazo-Cárdenas, César;Santillán-Pérez, Leticia;
Archivos de cardiología de México , 2005,
Abstract: objective: to determine the success rate and safety of percutaneous closure of patent ductus arteriosus (pda) with a detachable coil. methods: forty-one children with small-to moderate-size pda (maximum diameter < 4 mm) underwent percutaneous coil occlusion. the results were assessed by angiography and echocardiography the mean age was 2.0 ± 1.3 years (range 0.6 to 5.6 years); mean weight was 10.0 ± 3.4 kg (range 4.5 to 18.0 kg). the mean minimum diameter of the pda was 1.7 ± 0.6 mm (range, 0.5 to 4.0 mm). results: the occlusion device was inserted in 39 of 41 patients (95%). the mean coil/pda ratio was 3.41 ±1.1. we observed angiographic cessation of blood flow through the pda after coil insertion in 18 patients; 18 patients had residual shunt, 3 mild shunt and 2 moderate shunt. no complications were observed during the procedure. thirty-five patients showed absence of blood flow through pda 24 hours after coil occlusion by echocar-diography the other four patients with residual shunt showed flow cessation after 2 months in two patients and after 6 months in the other two. failure of coil insertion in two patients was due to detachment of the pulmonary edge of the coil, which was subsequently removed in one, and due to coil migration in the other, both patients underwent surgical pda closure. mean follow-up at 29.5 ± 16.5 months showed no residual blood flow through the occluded pda, except for one patient. conclusion: our results, as many others, suggest that pda coil occlusion is a safe, effective, and cheap procedure. pda coil occlusion should be the elective method for pda closure in patients older than 6 months of age with small-to moderate size pda(< 4 mm). the procedure in newborn infants and patients with larger pda must be made with a different type of occlusive device.
Cierre percutáneo del conducto arterioso persistente con dispositivo Amplatzer en ni?os: resultados inmediatos y a un a?o
Parra-Bravo, J Rafael;Cruz-Ramírez, Arturo;Toxqui-Terán, Alejandra;Juan-Martínez, Enriqueta;Chávez-Fernández, Alejandro;Lazo-Cárdenas, César;Beirana-Palencia, Luisa;Estrada-Flores, José;
Archivos de cardiología de México , 2009,
Abstract: objective: percutaneous closure of patent ductus arteriosus (pda) is a well established technique. our objective was to determine the safety and efficacy of the amplatzer occluder for the treatment of pda in children. methods: from november 2005 to june 2007 we reviewed the clinical records of 39 patients (23 girls and 16 boys), with a mean age of 19.8 ± 13.7 months and weight 9.2 ± 3.2 kg, who underwent percutaneous closure of a pda with an amplatzer device. the forty one percent of the patients (16/39) were < 1 year of age, and 71.8 % (28/39) weighed < 10 kg. the age of children with body weight < 10 kg was 13.1 ±6.1 months (range 5-33 months). the morphology of the pda was determined by a lateral aortogram and classified according to krichenko. all the patients were followed-up with radiologic and echocardiographic control at 24 hours, 1, 3, 6 and 12 months postinsertion (median 20 months). results: the pda diameter ranged between 2.0 mm to 12 mm (3.6 mm ± 2.0 mm) in the 39 patients included. pda types according to krichenko were: type a = 25 (64.1%), type b = 1 (2.6%), type c = 5 (12.8%), type d = 2 (5.1%) and type e = 3 (7.7%). three patients had a residual pda post-surgical closure attempt. qp/qs ratio was 2.4 ± 1.5 (range 1.0-6.7) and the relation psp/pss was 0.49 ± 0.18 (range: 0.21-0.87). pulmonary hypertension was present in 16 patients (41%). the amplatzer occluder was implanted successfully in 36/39 patients (92.3%). the procedure failed in three cases: 1) difficulty to place the device due to wrong assessment of the ductus size; 2) difficulty to advance the device due to angulation (kinking) of the releasing system; 3) migration of the device to descending aorta. the mean time of fluoroscopy and for the entire procedure was 13.2 ± 6.3 minutes and 65.3 ± 21.9 minutes, respectively. there were no deaths with the procedure. minor and mayor complications occurred in eight patients, all of them but one, in children with body weight < 10 kg. in the 36 success
Cierre percutáneo del conducto arterioso permeable utilizando el Amplatzer vascular Plug II
Parra-Bravo, Rafael;Beirana-Palencia, Luisa;Corona-Rodríguez, Antonio;Alarcón-Elguera, Laura;Tejeda-Hernández, Norma;Aguilar-Segura, Perla;Lazo-Cárdenas, César;Arellano-Llamas, Abril;
Archivos de cardiología de México , 2011,
Abstract: the amplatzer vascular plug ii (avp ii) is a self-expanding occluder device, indicated for arterial and venous occlusion in the peripheral circulation. objective: to describe our initial clinical experience with the avp ii, in the percutaneous closure of small patent ductus arteriosus. method: we retrospectively analyzed seven patients who underwent percutaneous closure of patent ductus arteriosus. the avp ii was chosen with a diameter greater than 50% of the minimum diameter of the ductus arteriosus. results:patients showed a ductus arteriosus with a diameter of 1.5 ± 1.4 (range: 0.8 - 4.7mm). successful implant was achieved with adequate angiographic occlusion in 6 patients. one patient was sent to surgery. we only found a major complication. transthoracic echocardiography at 24 hours, confirmed the complete occlusion in this patients. the follow-up was 10.6 ± 9.1 months. conclusion: the avp ii in this group of patients was shown to be safe and effective for percutaneous closure of patent ductus arteriosus.
Evaluación experimental del clorotalonil en el control de la sigatoka negra (Mycosphaerella fijiensis) en plantaciones de plátano (Musa spp. AAB) Experimental assessment of chlorothalonil for controlling Black Sigatoka (Mycosphaerella fijiensis) in plantain (Musa spp AAB)
José Vicente Lazo,José Alfredo Mu?oz,Aníbal Escalona
Bioagro , 2012,
Abstract: Para evaluar la eficacia y selectividad del fungicida Clorotalonil en el control de la Sigatoka Negra (Mycosphaerella fijiensis) se realizaron dos ensayos de campo ubicados en plantaciones comerciales de plátano del estado Mérida, Venezuela. En cada ensayo se utilizó un dise o de bloques al azar, con cuatro replicaciones y cinco tratamientos: Clorotalonil (formulación experimental) a 1,0; 1,5; y 2,0 kg·ha-1, un testigo comercial (Bravo 500) a 2 L·ha-1, y un testigo absoluto no tratado. Se realizó una única aplicación por tratamiento al observarse los primeros síntomas de da o de la enfermedad. La determinación de los valores de eficacia de control se basó en el cálculo de las variables, promedio ponderado de infección (PPI), hoja más joven enferma (HMJE), porcentaje de hojas sanas (% HS) y número de hojas por planta (H/P) que fueron establecidas tomando como base el método de Stover modificado por Gauhl, para la evaluación de la incidencia y severidad del da o causado por la enfermedad. Los resultados obtenidos mostraron que la eficacia de control de todos los tratamientos fungicidas fue estadísticamente significativa con respecto al testigo absoluto en función del comportamiento de las variables PPI, HMJE, % HS y HP. Todas las dosis fungicidas fueron altamente selectivas al cultivo. To evaluate the efficacy and selectivity of the fungicide chlorothalonil in the control of Black Sigatoka (Mycosphaerella fijiensis), two experimental field trials located in commercial crops of plantain in Merida State, were performed. Each experiment consisted on a randomized block design with 4 replications and 5 treatments: Chlorothalonil (experimental formulation) at rates of 1.0, 1.5 and 2.0 kg·ha-1, a commercial check (Bravo 500: 2 L·ha-1), and an untreated check. A single application was made when the first symptoms of the disease appeared in the plantain leaves. The quantitation of effectiveness of control was based on the calculation of the following variables: weighted average of infection (PPI), the youngest leaf affected (HMJE), the percentage of healthy leaves (% HS) and the number of leaves per plant (H/P), all of which were established based on the method of Stover, as amended by Gauhl, to assess the incidence and severity of damage caused by the disease. Results showed that effectiveness of all fungicide treatments were statistically significant with respect to absolute check, according to the performance of the variables, PPI, HMJE, % HS and HP. All fungicide treatments were highly selective to the crop.
LA INVESTIGACIóN CIENTíFICA Y EL PROBLEMA DE SU JUSTIFICACIóN EN LA DISCUSIóN BOYLE / SPINOZA
Cárdenas,José Luis;
Ideas y Valores , 2005,
Abstract: the purpose of this article is to show the conflict that has to do with epistemic and methodological issues involved in boyle/spinoza discussion, which allows to appreciate how it should be reassessed, at least two things, in the growing natural science of the seventeenth century: i) the preference of a hypothetical and practical knowledge instead of the mere pretence of an absolute certainty of the scientific knowledge. and ii) the investigation of the nature demands a careful experimentation that stresses the development of some epistemological approaches and different method to those to which most modern philosophers were accustomed to.
The Scientific Research and the Problem of its Justification
José Luis Cárdenas
Ideas y Valores , 2005,
Abstract: The purpose of this article is to show the conflict that has to do with epistemic and methodological issues involved in Boyle/Spinoza discussion, which allows to appreciate how it should be reassessed, at least two things, in the growing natural science of the Seventeenth Century: i) the preference of a hypothetical and practical knowledge instead of the mere pretence of an absolute certainty of the scientific knowledge. And ii) the investigation of the nature demands a careful experimentation that stresses the development of some epistemological approaches and different method to those to which most modern philosophers were accustomed to.
LA EFECTIVIDAD DEL BIOFERTILIZANTE ECOMIC? EN EL CULTIVO DE LA YUCA. RESULTADOS DE LAS CAMPA?AS DE EXTENSIONES CON PRODUCTORES
Rivera Espinosa,Ramón; Fundora Sánchez,Luis R; Calderón Puig Especialista,Alfredo; Martín Cárdenas,José V; Marrero Cruz,Yosnel; Martínez,Luis Ruiz; Simó González,Jaime; Riera Nelson,Manuel; Joao,José P;
Cultivos Tropicales , 2012,
Abstract: taking into account the positive and reproducible experimental results founded with the application of ecomic?, trough coating the vegetative seed tips of cassava with the arbuscular mycorrhizal fungal (amf) biofertilizer, at doses of 10 - 13 kg ha-1, two extensive field trials were conducted during 2007-2010 period, in order to test the feasibility of this application mode at a production scale. the trials were developed in 31 farms in guantánamo, cienfuegos, villa clara, matanzas and mayabeque provinces. an inoculated treatment and a control without inoculation were evaluated in surfaces of 0.5 to 1 ha, for all sites. the doses were independent of planting distances used. clones of cassava of different cycle, medium and large were used. cassava tips seeds were inoculated with g. cubense and g. intrarradices amf strains, depending of the soil type. in all cases, positive and significant responses were found on cassava yields, quantified around 33 % or 5t.ha-1 increment over the control. in 97 % of the trial yield increments were higher than 10% and in 70 % of the trials were higher than 25 %. the same positive response was found in both experimental years independently of soil type. the feasibility of cassava inoculation with this amf strains trough the recovering of tips seeds was demonstrated in this study.
A Two-Point Boundary Value Problem by Using a Mixed Finite Element Method  [PDF]
Pedro Pablo Cárdenas Alzate, José Rodrigo González Granada
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.612177
Abstract: This paper describes a numerical solution for a two-point boundary value problem. It includes an algorithm for discretization by mixed finite element method. The discrete scheme allows the utilization a finite element method based on piecewise linear approximating functions and we also use the barycentric quadrature rule to compute the stiffness matrix and the L2-norm.
Julio Calvo Pérez, Pragmática y gramática del Quechua cuzque o
José A. Cárdenas Bunsen
Lexis , 1994,
Abstract: JULIO CALVO PEREZ, Pragmática y gramática del Quechua cuzque o, Cuzco, Centro de Estudios Andinos Bartolomé de las Casas 1993,475 p.
Miguel Angel Quesada Pacheco, El espa ol colonial de Costa Rica
José Alejandro Cárdenas Bunsen
Lexis , 1994,
Abstract: MIGUEL ANGEL QUESADA PACHECO, El espa ol colonial de Costa Rica, San José, (Editorial de la Universidad de Costa Rica), 1990, 287 pp.
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