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Search Results: 1 - 10 of 488678 matches for " Mauricio Ramírez A. "
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La necrosis, un mecanismo regulado de muerte celular
Ramírez Agudelo,María Elena; Rojas López,Mauricio;
Iatreia , 2010,
Abstract: three types of cellular death have been defined by morphological and biochemical criteria: apoptosis, necrosis and autophagy. apoptosis is a regulated cell death, mainly mediated by caspases; autophagy induces degradation of intracellular damaged organelles through the formation of vesicles that fuse with hydrolytic vacuoles. necrosis has been traditionally defined by the rupture the cytoplasmic membrane with subsequent release of intracellular material, triggering localized inflammatory intrinsic cellular activities and the events preceding cellular collapse are critical to determine the type of tissue damage. the fact that all three types of cellular death can coexist in any organ and tissue with different availabilities of atp, suggests that necrosis can be conceived as an active event and that to some extent it may be regulated. alterations in the structure of proteins and in the activity of different proteases, lipases and nucleases, indicate that each cell may have its own arsenal to trigger the events leading to necrosis. in this article we review some of the evidences on cellular regulation during necrosis.
Impacto del castor (Castor canadensis, Rodentia) en bosques de lenga (Nothofagus pumilio) de Tierra del Fuego, Chile
Baldini U,Aida; Oltremari A,Juan; Ramírez,Mauricio;
Bosque (Valdivia) , 2008, DOI: 10.4067/S0717-92002008000200009
Abstract: castor canadensis is a north american rodent introduced in the argentinean part of tierra del fuego in 1946, invading chilean territories located in the same area. in this zone, not only do beavers build dikes, but they also feed on arboreal material, mainly from nothofagus pumilio. this study tried to prove that damage on both biomass and volume in the n. pumilio forest is caused by beavers. the objectives of the study were: to identify the type of damage and to quantify the loss of wood biomass and gross volume of the most abundant forest species. results indicated that more than half of measured trees presented some damage; the highest damage being presented by n. pumilio. loss in biomass reaches almost 15 t ha-1; amount superior to results found in studies made on the endemic environment of beavers. in relation to wood volume, over half of the stocks of n. pumilio forests associated to water resources have been lost in tierra del fuego due to the effect of beaver. the most important volume loss of this species derives from the death of individuals in flooded zones as a result of dike construction.
Técnicas intravenosas para operación cesárea
Vasco Ramírez,Mauricio; Lopera,Luz María;
Revista Colombiana de Anestesiología , 2006,
Abstract: the present prospective case series evaluated six pregnant patient with diagnostic of severe preeclampsia complicated with hellp syndrome undergoing urgent caesarean delivery in the maternal child unit of clinica universitaria bolivariana using an intravenous technique with propofol and remifentanil. a 1 mcg/kg bolus of remifentanil was given intravenously, followed by a continuous infusion of 0.1 to 0.5 mcg/kg/min and 2 mg/kg bolus of propofol followed by a continuous infusion of 100 200 mcg/kg/min. none of the patients presented hypotension or bradycardia during anesthetic induction or maintenance. just one patient developed uterine atony but this patient had a time uterine incision delivery of more than three minutes. no awareness nor maternal mortality were found. two neonatal deaths in babies with weight less than 1200 grams for extreme prematurity and hyaline membrane disease were reported. one minute apgar was 5 in average and five minutes apgar was 8 in average. just one neonate required mechanical ventilation for hyaline membrane disease and just one neonate required naloxone, according to neonatologist criteria. the present case series is the first in our ground that describes total intravenous anesthesia based on propofol and remifentanil in pregnant patients with diagnostic of hellp and it is suggested as an alternative to traditional techniques of general anesthesia in pregnant patients with this kind of disease.
Necrosis, a regulated mechanism of cell death La necrosis, un mecanismo regulado de muerte celular
Mauricio Rojas López,María Elena Ramírez Agudelo
Iatreia , 2010,
Abstract: Three types of cellular death have been defined by morphological and biochemical criteria: apoptosis, necrosis and autophagy. Apoptosis is a regulated cell death, mainly mediated by caspases; autophagy induces degradation of intracellular damaged organelles through the formation of vesicles that fuse with hydrolytic vacuoles. Necrosis has been traditionally defined by the rupture the cytoplasmic membrane with subsequent release of intracellular material, triggering localized inflammatory Intrinsic cellular activities and the events preceding cellular collapse are critical to determine the type of tissue damage. The fact that all three types of cellular death can coexist in any organ and tissue with different availabilities of ATP, suggests that necrosis can be conceived as an active event and that to some extent it may be regulated. Alterations in the structure of proteins and in the activity of different proteases, lipases and nucleases, indicate that each cell may have its own arsenal to trigger the events leading to necrosis. In this article we review some of the evidences on cellular regulation during necrosis. Con base en criterios morfológicos y bioquímicos se han definido tres clases de muerte celular: apoptosis, autofagia y necrosis. La primera es una muerte celular regulada, mediada principalmente por caspasas; en la autofagia ocurre formación de vesículas que se fusionan con vacuolas hidrolíticas para degradar organelas intracelulares alteradas. En cuanto a la necrosis, se la ha definido tradicionalmente por la ruptura de la membrana citoplasmática con salida del material intracelular lo que desencadena una reacción
Impacto del castor (Castor canadensis, Rodentia) en bosques de lenga (Nothofagus pumilio) de Tierra del Fuego, Chile Impact of american beaver (Castor canadensis, Rodentia) in lenga (Nothofagus pumilio) forests of Tierra del Fuego, Chile
Aida Baldini U,Juan Oltremari A,Mauricio Ramírez
Bosque (Valdivia) , 2008,
Abstract: Castor canadensis es un roedor de Norteamérica introducido a la porción argentina de Tierra del Fuego en el a o 1946, invadiendo territorios chilenos del mismo sector. En esta zona los castores construyen diques y se alimentan de material arbóreo extraído principalmente de Nothofagus pumilio. En el estudio se intentó probar que los castores provocan da o en la biomasa y volumen de los bosques de N. pumilio. Los objetivos del estudio fueron identificar los tipos de da os y cuantificar las pérdidas de biomasa le osa y de volumen bruto de la especie forestal más abundante. Los resultados indicaron que más de la mitad de los árboles medidos presentó algún da o, correspondiendo en su gran mayoría a N. pumilio. Las pérdidas en biomasa alcanzaron casi 15 t ha-1, cantidad superior a los resultados encontrados en estudios realizados en el ambiente endémico de los castores. Respecto a volumen de madera, más de la mitad de la existencia de bosques de N. pumilio asociados a cursos de agua ha sido da ada en Tierra del Fuego por efecto de los castores. La pérdida más importante de volumen de esta especie resulta de la muerte de individuos en zona de inundación de la represa castoril. Castor canadensis is a North American rodent introduced in the Argentinean part of Tierra del Fuego in 1946, invading Chilean territories located in the same area. In this zone, not only do beavers build dikes, but they also feed on arboreal material, mainly from Nothofagus pumilio. This study tried to prove that damage on both biomass and volume in the N. pumilio forest is caused by beavers. The objectives of the study were: to identify the type of damage and to quantify the loss of wood biomass and gross volume of the most abundant forest species. Results indicated that more than half of measured trees presented some damage; the highest damage being presented by N. pumilio. Loss in biomass reaches almost 15 t ha-1; amount superior to results found in studies made on the endemic environment of beavers. In relation to wood volume, over half of the stocks of N. pumilio forests associated to water resources have been lost in Tierra del Fuego due to the effect of beaver. The most important volume loss of this species derives from the death of individuals in flooded zones as a result of dike construction.
Técnicas intravenosas para operación cesárea
Mauricio Vasco Ramírez,Luz María Lopera
Revista Colombiana de Anestesiología , 2006,
Abstract: La presente serie de casos prospectiva evaluó seis maternas de la Unidad Materno Infantil de la Clínica Universitaria Bolivariana, con diagnóstico de preeclampsia severa complicada con síndrome HELLP, en quienes se utilizó una técnica intravenosa basada en propofol y remifentanilo, para realización de operación cesárea urgente. Todas las pacientes recibieron por vía intravenosa bolo de remifentanilo de 1mcg/kg, seguido de infusión de 0.1 a 0.5 mcg/kg/min y un bolo de propofol de 2mg/kg, seguido de una infusión de 100 a 200mcg/kg/min. Ninguna de las pacientes desarrolló hipotensión o bradicardia durante la inducción y mantenimiento anestésico. Sólo una de las pacientes desarrolló atonía uterina, pero esta paciente tuvo un tiempo incisión uterina nacimiento mayor de 3 minutos. No se presentó recuerdo intraoperatorio ni mortalidad materna. Se presentaron dos muertes neonatales en fetos con peso inferior a los 1200 gramos, por prematurez extrema y enfermedad de membrana hialina. El APGAR, en promedio, fue de 5 al minuto y de 8 a los cinco minutos. Sólo un neonato requirió ventilación mecánica por enfermedad de membrana hialina y únicamente un paciente requirió uso de naloxona, según criterio del neonatólogo. Esta serie de casos es la primera en nuestro medio que describe la anestesia intravenosa total con propofol y remifentanil en maternas, con diagnóstico de HELLP, programadas para cesárea urgente y se sugiere como alternativa a las técnicas tradicionales de anestesia general en maternas con esta entidad. The present prospective case series evaluated six pregnant patient with diagnostic of severe preeclampsia complicated with HELLP syndrome undergoing urgent caesarean delivery in the Maternal Child Unit of Clinica Universitaria Bolivariana using an intravenous technique with propofol and remifentanil. A 1 mcg/kg bolus of remifentanil was given intravenously, followed by a continuous infusion of 0.1 to 0.5 mcg/kg/min and 2 mg/kg bolus of propofol followed by a continuous infusion of 100 200 mcg/kg/min. None of the patients presented hypotension or bradycardia during anesthetic induction or maintenance. Just one patient developed uterine atony but this patient had a time uterine incision delivery of more than three minutes. No awareness nor maternal mortality were found. Two neonatal deaths in babies with weight less than 1200 grams for extreme prematurity and hyaline membrane disease were reported. One minute APGAR was 5 in average and five minutes APGAR was 8 in average. Just one neonate required mechanical ventilation for hyaline membrane disease and jus
Monitoría hemodinámica no invasiva en Síndrome Hellp
Monsalve Mejía,Germán; Rodríguez Fraile,José Ramón; Vasco Ramírez,Mauricio;
Revista Colombiana de Anestesiología , 2006,
Abstract: the hellp (hemolysis, elevated liver enzymes, low platelets) syndrome is a serious complication that affects around 10% pregnancies with severe preeclampsia-eclampsia [1]. most of the patients with a diagnosis of hellp syndrome come to light after 27 weeks? gestation. when the cardiovascular system compromise is severe, the invasive monitoring is frequent in order to make a guided therapeutic and reduce the complications. albeit the use of the pulmonary artery catheter is reported in patients with severe preeclampsia and associated hellp syndrome with serious cardiovascular compromise and refractory oliguria, there is a risk of mayor complications associated with central punctures in these patients with severe thrombocytopenia [2]. the hemosonic 100 (arrow international, reading, pa) uses transesophageal doppler ultrasound to measure the aortic blood flow in a non-invasive way and beat by beat in real time. we report the use of hemosonic 100 during the cesarean section of a patient with hellp syndrome in order to optimize the intraoperatory cardiovascular management.
Monitoría hemodinámica no invasiva en Síndrome Hellp
Germán Monsalve Mejía,José Ramón Rodríguez Fraile,Mauricio Vasco Ramírez
Revista Colombiana de Anestesiología , 2006,
Abstract: El síndrome HELLP (hemólisis, elevación de las enzimas hepáticas y trombocitopenia) es una complicación grave que afecta cerca del 10% de los embarazos con diagnóstico de preeclampsia severa y eclampsia (1). La mayor parte de las pacientes con diagnóstico de síndrome HELLP se presentan después de las 27 semanas de edad gestacional y cuando el compromiso del aparato cardiovascular es severo. Es frecuente la necesidad de monitoría invasiva para realizar una terapéutica guiada y disminuir las complicaciones, aunque el uso del catéter de arteria pulmonar se ha reportado en pacientes con diagnóstico de preeclampsia severa asociado a síndrome HELLP con compromiso cardiovascular severo u oliguria refractaria; existe un riesgo de complicaciones mayores asociado a las punciones centrales en estas pacientes con trombocitopenia severa(2). El Hemosonic 100 (Arrow Internacional, Reading, PA) utiliza técnicas de ultrasonido Doppler por vía transesofágica para medir el flujo sanguíneo aórtico de manera no invasiva y de una manera latido a latido en tiempo real. Nosotros reportamos el uso del Hemosonic 100 durante la cesárea en una paciente con síndrome HELLP con el fin de optimizar el manejo cardiovascular intraoperatorio. The HELLP (hemolysis, elevated liver enzymes, low platelets) syndrome is a serious complication that affects around 10% pregnancies with severe preeclampsia-eclampsia [1]. Most of the patients with a diagnosis of HELLP syndrome come to light after 27 weeks’ gestation. When the cardiovascular system compromise is severe, the invasive monitoring is frequent in order to make a guided therapeutic and reduce the complications. Albeit the use of the pulmonary artery catheter is reported in patients with severe preeclampsia and associated HELLP syndrome with serious cardiovascular compromise and refractory oliguria, there is a risk of mayor complications associated with central punctures in these patients with severe thrombocytopenia [2]. The HEMOSONIC 100 (Arrow International, Reading, PA) uses transesophageal Doppler ultrasound to measure the aortic blood flow in a non-invasive way and beat by beat in real time. We report the use of HEMOSONIC 100 during the cesarean section of a patient with HELLP syndrome in order to optimize the intraoperatory cardiovascular management.
Interacciones de pesquerías ribere as en Bahía Magdalena-Almejas, Baja California Sur
Miguel A. Ojeda Ruiz de la Pe?a,Mauricio Ramírez Rodríguez
Región y sociedad , 2012,
Abstract: Con el fin de aportar al desarrollo de un modelo conceptual sobre la pesca ribere a o artesanal en el área de Bahía Magdalena-Almejas, Baja California Sur, se jerarquizó la importancia de 14 pesquerías de la región. La calificación se basó en un análisis cualitativo por puntos y en la estimación de un índice de importancia relativa, con indicadores como los promedios de captura, valor y frecuencia de registro de especies objetivo en desembarcos de embarcaciones menores, de 1998 a 2009; entre ellas están: almeja catarina, escama, camarón, callo de hacha, tiburón, jaiba, calamar, almeja pata de mula, rayas, lisa, pulpo, abulón, langosta y caracol chino. La interacción temporal entre varias de ellas es controlada por vedas oficiales, pero cuando ocurre se reconocen posibles efectos por pesca incidental e ilegal y modificaciones al ecosistema.
Agnosia integrativa causada por una epilepsia focal occipital izquierda: estudio de caso
Aguilar Mejía,óscar Mauricio; Ramírez Bermejo,Beatriz; Silva Martín,Luis Manuel;
Diversitas: Perspectivas en Psicología , 2011,
Abstract: integrative agnosia is a type of visual agnosia associated with bilateral occipital lesions and characterized by the inability to identify stimuli in complex backgrounds, especially when it comes to overlapping or interlocking shapes. there are difficulties in coding and grouping the whole from the parts of the stimulus. we report a case of a 14 year-old female, with integrative agnosia as consequence of refractory symptomatic focal epilepsy with left occipital epileptogenic focus. clinical features and the visual recognition processes are analyzed and discussed from different theoretical models that attempt to explain visual perception.
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