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Search Results: 1 - 10 of 11354 matches for " Ernesto; álvarez Arredondo "
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Granuloma reparativo de células gigantes agresivo en región mandibular
Sánchez Cabrales,Ernesto; álvarez Arredondo,Blanca; Vila Morales,Dadonim;
Revista Cubana de Estomatolog?-a , 2010,
Abstract: the giant cells reparative granulomas (gcrg) is a reactive and aggressive process appearing more frequently in anterior sector of mandible and maxilla in children and young adolescents accounting for the 1 % of tumor bone lesions. there is a considerable controversy if they are benign or reactive lesions from the point of view of its origin, from its clinical and histological features as well as therapeutical. this is the case of a patient seen in external consultation of maxillofacial surgery of the "juán manuel márquez" children and university hospital at october, 2007 in whom an extent lesion diagnosed as an aggressive gcrg provoked a facial deformity and osteolysis of mandibular body. complementary, physical and iconopathographic examinations were made as well as surgical treatment and analysis of this sample. patient has neither aesthetic alterations nor functional. there was no relapse after 30 months of follow-up. we made a review of more update literature in med line, lilac and google websites with the giant cells reparative granulomas as key words in english and spanish languages, to compare our procedures and results with other reports.
Granuloma reparativo de células gigantes agresivo en región mandibular Aggressive giant cells reparative granulomas in mandibular region
Ernesto Sánchez Cabrales,Blanca álvarez Arredondo,Dadonim Vila Morales
Revista Cubana de Estomatolog?-a , 2010,
Abstract: El granuloma reparativo de células gigantes (GRCG) es un proceso reactivo agresivo, que aparece con mayor frecuencia en los sectores anteriores de la mandíbula y el maxilar, en ni os y adolecentes jóvenes. Constituye el 1 % de las lesiones óseas tumorales. Existe una considerable controversia acerca de si son lesiones benignas o reactivas; también desde el punto de vista de su origen, de sus características clínicas e histológicas, así como su terapéutica. En octubre de 2007 acudió un caso a consulta externa de Cirugía Maxilofacial del Hospital Pediátrico Universitario "Juan M. Márquez", con una lesión diagnosticada como GRCG agresivo, la cual provocó gran deformidad facial y osteólisis del cuerpo mandibular. Se realizaron exámenes físicos, complementarios e iconopatográfico. Se ejecutó tratamiento quirúrgico y análisis de la pieza. La paciente no tuvo alteraciones estéticas ni funcionales. Hubo ausencia de recidiva, luego de 30 meses de seguimiento. Se revisó la literatura más reciente en los sitios Med Line, Lilac, Google, con las palabras clave granuloma reparativo de células gigantes, en inglés y espa ol, para comparar nuestros procederes y resultados con otros reportes. The giant cells reparative granulomas (GCRG) is a reactive and aggressive process appearing more frequently in anterior sector of mandible and maxilla in children and young adolescents accounting for the 1 % of tumor bone lesions. There is a considerable controversy if they are benign or reactive lesions from the point of view of its origin, from its clinical and histological features as well as therapeutical. This is the case of a patient seen in external consultation of Maxillofacial Surgery of the "Juán Manuel Márquez" Children and University Hospital at October, 2007 in whom an extent lesion diagnosed as an aggressive GCRG provoked a facial deformity and osteolysis of mandibular body. Complementary, physical and iconopathographic examinations were made as well as surgical treatment and analysis of this sample. Patient has neither aesthetic alterations nor functional. There was no relapse after 30 months of follow-up. We made a review of more update literature in Med Line, Lilac and Google websites with the giant cells reparative granulomas as key words in English and Spanish languages, to compare our procedures and results with other reports.
Aplicación de distracción osteogénica mandibular en ni?os con el síndrome de apnea obstructiva del sue?o
Vila Morales,Dadonim; Garmendía Hernández,Georgia; Garmendía,ángel Mario Felipe; Suárez Bosch,Fausto; Sánchez Cabrales,Ernesto; álvarez Arredondo,Blanca;
Revista Cubana de Estomatolog?-a , 2010,
Abstract: objectives: to show the results from the first patients presenting with sleep obstructive apnea syndrome (soas) of skeletal peripheral type treated in our country with osteogenesis by mandibular distraction. methods: nine patients were treated with bilateral mandibular osteogenic distraction using leibinger and synthes distraction devices. latency period was of 72 hours. mandibular distraction rate at 1,0 mm each 12 hours and restraint was of 8 weeks. then, postsurgical orthodontics treatment was started. results were assessed by polysomnography and cephalometry studies before intervention, after it and at a year of treatment. results: the 89 % of cases had a good recovery, the 11 % showed an improvement. complications included: a temporary limitation of mouth opening in 55 % disappearing with physiotherapy and two patients needed tracheostomy for anesthetic purposes. conclusions: osteogenesis by mandibular distraction was an effective therapeutical method for treatment of peripheral skeletal soas.
EFECTO DE LA TEMPERATURA Y LA SUPLEMENTACIóN ENERGéTICA SOBRE LA PRODUCCIóN DE LECHE EN VACAS LECHERAS A PASTOREO
Jahn,Ernesto; Arredondo,Susana; Bonilla,Walter; Del Pozo,Alejandro;
Agricultura Técnica , 2002, DOI: 10.4067/S0365-28072002000200007
Abstract: a study was carried out to evaluate the effect of supplementation in the shade in summer months for cows grazing on a perennial pasture of clover-ryegrass (trifolium repens l. - lolium multiflorum l.). four treatments were compared: i. day and night grazing without supplementation; ii. day and night grazing plus supplementation; iii. day and night grazing plus supplementation in the shade between 11:30 and 17:00 h; and iv. day and night grazing plus supplementation in the sun between 11:30 and 17:00 h. thirty-two holstein cows with an average production of 20.5 l d-1 were used, and assigned to the four treatments in a completely randomized block design. there were no significant (p 3 0.05) treatment effects on milk production; highest production was observed on treatment iii (19.5 l d-1). highest ambient temperatures during january and february where 33.5 and 34.5oc, respectively. rectal temperature was significantly higher (p < 0.05) in the treatments where the animals were in the sun, reaching 39.55, 39.00 and 39.43oc for treatments ii, iii and iv, respectively. a slight increase in corn silage consumption during supplementation was observed for cows in the shade. the lower silage consumption of animals remaining in the sun was apparently compensated by higher pasture intake during the night. measurements of animal behavior were made by periodic observation 24 hours a day.
POBLACIóN Y FERTILIZACIóN NITROGENADA EN UN HíBRIDO DE MAíZ PARA ENSILAJE EN EL VALLE CENTRAL REGADO
Soto O.,Patricio; Jahn B.,Ernesto; Arredondo S.,Susana;
Agricultura Técnica , 2002, DOI: 10.4067/S0365-28072002000200008
Abstract: the effect of three nitrogen fertilization rates and four planting densities on dry matter and protein yield of silage corn (zea mays l.) was evaluated. the densities were as follows: 70,000, 90,000, 110,000 and 130,000 plants ha-1, and the nitrogen rates: 150, 300 and 450 kg n ha-1, giving a total of 12 treatments which were evaluated in 22.4 m2 plots. both factors were evaluated in a completely randomized block design with 4 replicates in a 2x4 factorial arrangement. evaluation was performed between october and march 1996-1997. data were analyzed in an analysis of variance and means were compared using the duncan test and regression analysis. as nitrogen applied to corn increased, forage yield and protein yield per ha also increased. this increase was 3.8 dm ha-1 when nitrogen was increased from 150 to 300 kg n ha-1, and 2.0 t dm ha-1 as n increased from 300 to 450 kg n ha-1. higher plant density produces increased forage production per hectare, but protein yield was not affected. higher levels of n fertilization increased protein percentage in forage. higher levels of n application reduced efficiency of n use (74%) as compared to 94% when n application was 150 kg n ha-1; n losses presented the opposite tendency. higher levels of n application reduced the percentage of dry leaves in the plants, varying between 44 and 28% for fertilization of 150 and 450 kg n ha-1, respectively.
MEJORAMIENTO DEL PORCENTAJE DE PROTEíNA EN MAIZ PARA ENSILAJE CON EL AUMENTO Y PARCIALIZACIóN DE LA FERTILIZACIóN NITROGENADA
Soto O.,Patricio; Jahn B.,Ernesto; Arredondo S.,Susana;
Agricultura Técnica , 2004, DOI: 10.4067/S0365-28072004000200004
Abstract: in clay soils with poor drainage two trials were carried out with the objective of determining the effect of nitrogen application on maize (zea mays l.) for silage on forage yield and protein content. in trial 1, the treatments were two corn silage hybrids of different growing periods, sx-43 and inia-150, sown at 90.000 plants ha-1 and four n rates: 0, 100, 200 and 400 kg n ha-1. in trial 2, the treatments were two n rates: 200 and 400 kg of n ha-1, and three forms of n application: a) 1/2 at sowing + 1/2 at 30 cm plant height; b) 1/3 at sowing + 1/3 at 30 cm plant height + 1/3 at 60 cm plant height; and c) 1/4 at sowing + 1/4 at 30 cm plant height + 1/4 at 60 cm plant height +1/4 at flowering. one treatment was without n. in trial 1 n application increased dm yield (p < 0.05), but no significant response was observed with n rates between 100 and 400 kg n ha-1, due to soil limitations. forage production and protein percentage increased significantly with n application. in trial 2, dm production in corn silage increased with higher n rates (p < 0.05). forage protein percentage was increased by higher n rates and partitioning of the application. on increasing the partitioning of n from two to four applications, protein percentage of forage was increased by 23 and 37% for 200 and 400 kg of n ha-1, respectively.
POBLACIóN Y FERTILIZACIóN NITROGENADA EN UN HíBRIDO DE MAíZ PARA ENSILAJE EN EL VALLE CENTRAL REGADO Planting density and nitrogen fertilization of hybrid corn for silage in the irrigated central valley
Patricio Soto O.,Ernesto Jahn B.,Susana Arredondo S.
Agricultura Técnica , 2002,
Abstract: Se evaluó el efecto de tres dosis de nitrógeno y cuatro densidades de plantas sobre el rendimiento de forraje y proteína en un híbrido tardío de maíz (Zea mays L.) para ensilaje. Las densidades fueron: 70.000, 90.000, 100.000 y 130.000 plantas ha-1; y los niveles de N fueron 150, 300 y 450 kg de N ha-1, dando origen a 12 tratamientos, los que fueron establecidos en parcelas de 22,4 m2. Ambos factores fueron evaluados en un dise o de bloques completos al azar con 4 repeticiones, con arreglo factorial 2 x 4. La evaluación se realizó entre los meses de octubre y marzo. Se realizó análisis de varianza y en la comparación de medias se usó la prueba de Duncan y curvas de regresión. Los resultados muestran que al aumentar la cantidad de N aplicado al maíz, se incrementa el rendimiento de forraje y de proteína por hectárea. Este incremento fue de 3,8 t MS ha-1 al pasar de 150 a 300 kg de N ha-1 aplicado y 2,0 t MS ha-1 al aumentar de 300 a 450 kg de N ha-1. El incremento de la densidad de plantas produce un aumento en la producción de forraje por hectárea, mientras que la producción de proteína no sufre variación. El aumento de la fertilización nitrogenada incrementa el contenido de proteína del forraje. Los niveles más altos de aplicación de N presentaron una menor eficiencia (74%) en el uso de este elemento comparado con 94% con una aplicación de 150 kg N ha-1 , mientras que las pérdidas de N presentaron el efecto contrario. El aumento en los niveles de fertilización nitrogenada provocaron la disminución del porcentaje de hojas secas en las plantas variando entre 44 y 28 % para una fertilización de 150 y 450 kg N ha-1 , respectivamente. The effect of three nitrogen fertilization rates and four planting densities on dry matter and protein yield of silage corn (Zea mays L.) was evaluated. The densities were as follows: 70,000, 90,000, 110,000 and 130,000 plants ha-1, and the nitrogen rates: 150, 300 and 450 kg N ha-1, giving a total of 12 treatments which were evaluated in 22.4 m2 plots. Both factors were evaluated in a completely randomized block design with 4 replicates in a 2x4 factorial arrangement. Evaluation was performed between October and March 1996-1997. Data were analyzed in an analysis of variance and means were compared using the Duncan test and regression analysis. As nitrogen applied to corn increased, forage yield and protein yield per ha also increased. This increase was 3.8 DM ha-1 when nitrogen was increased from 150 to 300 kg N ha-1, and 2.0 t DM ha-1 as N increased from 300 to 450 kg N ha-1. Higher plant density produces increased forage pr
EFECTO DE LA TEMPERATURA Y LA SUPLEMENTACIóN ENERGéTICA SOBRE LA PRODUCCIóN DE LECHE EN VACAS LECHERAS A PASTOREO Effect of temperature and energy supplementation on milk production of grazing dairy cows
Ernesto Jahn,Susana Arredondo,Walter Bonilla,Alejandro Del Pozo
Agricultura Técnica , 2002,
Abstract: Se realizó un ensayo con el objeto de determinar el efecto de la suplementación a la sombra durante los meses de verano para vacas que pastorean una pradera de trébol blanco - ballica perenne (Trifolium repens L. -Lolium multiflorum L.). Se compararon 4 tratamientos: I. Pastoreo día y noche sin suplementación; II. Pastoreo día y noche más suplementación; III. Pastoreo día y noche más suplementación a la sombra entre 11:30 y 17:00 h; y IV. Pastoreo día y noche más suplementación al sol entre 11:30 y 17:00 h. Se utilizaron 32 vacas Holstein con una producción promedio inicial de leche de 20,5 L d-1, las que fueron distribuidas en un dise o de bloques. Los resultados mostraron que no hubo un efecto significativo (P 3 0,05) de los tratamientos sobre la producción de leche, siendo el tratamiento III donde se obtuvo la mayor producción de leche (19,5 L d-1). Las temperaturas ambientales durante los meses de enero y febrero alcanzaron 33,5 y 34,5oC, respectivamente. Las temperaturas rectales fueron significativamente mas altas (P < 0,05) en los tratamientos donde los animales permanecieron al sol, alcanzando los 39,55; 39,00 y 39,43oC para los tratamientos II, III y IV, respectivamente. Se observó un leve aumento en el consumo de ensilaje de maíz en los animales que permanecieron a la sombra. El menor consumo de ensilaje de los animales que permanecieron al sol fue aparentemente compensado con un mayor consumo de pradera en el período nocturno. Se realizaron mediciones de comportamiento animal por observación durante las 24 h. A study was carried out to evaluate the effect of supplementation in the shade in summer months for cows grazing on a perennial pasture of clover-ryegrass (Trifolium repens L. - Lolium multiflorum L.). Four treatments were compared: I. Day and night grazing without supplementation; II. Day and night grazing plus supplementation; III. Day and night grazing plus supplementation in the shade between 11:30 and 17:00 h; and IV. Day and night grazing plus supplementation in the sun between 11:30 and 17:00 h. Thirty-two Holstein cows with an average production of 20.5 L d-1 were used, and assigned to the four treatments in a completely randomized block design. There were no significant (P 3 0.05) treatment effects on milk production; highest production was observed on treatment III (19.5 L d-1). Highest ambient temperatures during January and February where 33.5 and 34.5oC, respectively. Rectal temperature was significantly higher (P < 0.05) in the treatments where the animals were in the sun, reaching 39.55, 39.00 and 39.43oC for treatments II
MEJORAMIENTO DEL PORCENTAJE DE PROTEíNA EN MAIZ PARA ENSILAJE CON EL AUMENTO Y PARCIALIZACIóN DE LA FERTILIZACIóN NITROGENADA Improvement of protein percentage in corn silage with an increase in and partitioning of nitrogen fertilization
Patricio Soto O.,Ernesto Jahn B.,Susana Arredondo S.
Agricultura Técnica , 2004,
Abstract: En suelos arcillosos de mal drenaje se realizaron dos ensayos con el objetivo de determinar la respuesta de maíz (Zea mays L.) para ensilaje a la aplicación de N en el rendimiento y contenido de proteína del forraje. En el Ensayo 1 los tratamientos correspondieron a dos híbridos de maíz para ensilaje de distinta precocidad, SX-43 e INIA-150, sembrados con una población de 90.000 plantas ha-1 y cuatro dosis de N: 0, 100, 200 y 400 kg N ha-1. En el Ensayo 2, los tratamientos fueron dos dosis de N: 200 y 400 kg N ha-1, y tres formas de aplicación de nitrógeno: a) 1/2 a la siembra + 1/2 a 30 cm de altura de las plantas; b) 1/3 a la siembra + 1/3 a 30 cm de altura de las plantas + 1/3 a 60 cm de altura de plantas; y c) 1/4 a la siembra + 1/4 a 30 cm de altura de las plantas + 1/4 a 60 cm de altura de plantas +1/4 en floración. Además se incluyó un tratamiento sin aplicación de N. En el Ensayo 1, la aplicación de N aumentó el rendimiento de MS (P < 0,05), sin embargo no hubo respuesta significativa entre 100 y 400 kg de N, debido a limitantes de suelo. La producción y el porcentaje de proteína del forraje aumentó significativamente con la aplicación de N. En el Ensayo 2, la producción de MS en el maíz aumentó con la aplicación de N (P < 0,05). El porcentaje de proteína del forraje se incrementó con mayores dosis de N y su parcialización. Al aumentar la parcialización del N de 2 a 4 aplicaciones se incrementó el tenor proteico del forraje en 23 y 37 % para las dosis de 200 y 400 kg N ha-1, respectivamente. In clay soils with poor drainage two trials were carried out with the objective of determining the effect of nitrogen application on maize (Zea mays L.) for silage on forage yield and protein content. In Trial 1, the treatments were two corn silage hybrids of different growing periods, SX-43 and INIA-150, sown at 90.000 plants ha-1 and four N rates: 0, 100, 200 and 400 kg N ha-1. In Trial 2, the treatments were two N rates: 200 and 400 kg of N ha-1, and three forms of N application: a) 1/2 at sowing + 1/2 at 30 cm plant height; b) 1/3 at sowing + 1/3 at 30 cm plant height + 1/3 at 60 cm plant height; and c) 1/4 at sowing + 1/4 at 30 cm plant height + 1/4 at 60 cm plant height +1/4 at flowering. One treatment was without N. In Trial 1 N application increased DM yield (P < 0.05), but no significant response was observed with N rates between 100 and 400 kg N ha-1, due to soil limitations. Forage production and protein percentage increased significantly with N application. In Trial 2, DM production in corn silage increased with higher N rates (P < 0.05). Forage
Dynamics in the Schwarzschild isosceles three body problem
John A. Arredondo,Ernesto Perez-Chavela,Cristina Stoica
Mathematics , 2014, DOI: 10.1007/s00332-014-9210-0
Abstract: The Schwarzschild potential, defined as U(r)=-A/r-B/r^3, where r is the distance between two mass points and A,B>0, models astrophysical and stellar dynamics systems in a classical context. In this paper we present a qualitative study of a three mass point system with mutual Schwarzschild interaction where the motion is restricted to isosceles configurations at all times. We retrieve the relative equilibria and provide the energy-momentum diagram. We further employ appropriate regularization transformations to analyse the behaviour of the flow near triple collision. We emphasize the distinct features of the Schwarzschild model when compared to its Newtonian counterpart. We prove that, in contrast to the Newtonian case, on any level of energy the measure of the set on initial conditions leading to triple collision is positive. Further, whereas in the Newtonian problem triple collision is asymptotically reached only for zero angular momentum, in the Schwarzschild problem the triple collision is possible for non-zero total angular momenta (e.g., when two of the mass points spin infinitely many times around the centre of mass). This phenomenon is known in celestial mechanics as the "black-hole effect" and it is understood as an analogue in the classical context of the behaviour near a Schwarzschild black hole. Also, while in the Newtonian problem all triple collision orbits are necessarily homothetic, in the Schwarzschild problem this is not necessarily true. In fact, in the Schwarzschild problem there exist triple collision orbits which are neither homothetic, nor homographic.
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