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Search Results: 1 - 10 of 327643 matches for " Contreras Cortés "
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Cool dwarfs in wide multiple systems. Paper 5: New astrometry of 54 wide pairs with M dwarfs
M. Cortés-Contreras,J. A. Caballero,D. Montes
Physics , 2015,
Abstract: We investigate the membership in double, triple or higher-order-multiplicity systems of 54 pairs with at least one bright M dwarf in the solar neighbourhood. These M dwarfs are potential targets of radial-velocity surveys for exoplanets. We measure angular separations and position angles from optical images taken with TCP and CAMELOT at the IAC80 telescope at the Observatorio del Teide, and complement them with our measurements on photographic plate digitizations. We also use data in the Washington Double Star Catalogue and other bibliographic sources. We confirm the physical binding of 52 multiple systems, for which we comprehensively compile, derive and provide basic astrophysical parameters in a homogeneous way (spectral types, heliocentric distances, projected physical separations, individual masses, estimated orbital periods, binding energies). Of the 52 systems, 38 are double, 11 are triple and three are quadruple with a variety of architectures. Four systems contain white dwarfs, six systems display variations of position angle larger than 12 deg (1/30 orbit) on a scale of decades and seven systems are located at less than 10 pc. We provide new information, or correct published data, of the most remarkable multiple systems and identify some of them for high-resolution imaging and spectroscopic follow-up.
MAGNETIC BEHAVIOR AND ANTIBACTERIAL ACTIVITY OF IRON (III) COMPLEXES
PIEDAD CORTéS-CORTéS,ANA MARíA ATRIA,MARTíN CONTRERAS,OCTAVIO PE?A
Journal of the Chilean Chemical Society , 2008,
Abstract: The preparation, magnetic characterization and antimicrobial properties of the complexes [Fe(3)0(CH3COO)6(CH3COOH)(H(2)0)]Cl(MeImid)-(H(2)0) (1) and [Fe(4)0(2)(CH3COO)(7)0(2)(BPA)2(H(2)0)]- CH.25(CH3CH2OH)(H(2)0) (2), where Melmid is 2-methyl-imidazolium and BPA is 2,2'-bipyridine, are described. The variable temperature susceptibilities of these complexes were investigated in the temperature range 2-300K. The data have been modeled on the assumption of "butterfly" arranged for (2) and equilateral triangle of ferric ions for (1). The antimicrobial activities of these complexes have been screened in vitro against different bacterial strains. The complexes (1) and (2) display activity over Gram negative bacteria and these compounds not present activity over Gram positive strains. These complexes have bacteriostatic effect over bacterial target. The toxicity analyses of iron complexes showed these have cytotoxicity effect to values around the MIC on human cell.
Cirugía laparoscópica en el tratamiento de enfermedades adrenales: experiencia en 200 casos
Castillo,O.; Cortés,O.; Kerkebe,M.; Pinto,I.; Arellano,L.; Contreras,M.;
Actas Urológicas Espa?olas , 2006, DOI: 10.4321/S0210-48062006000900010
Abstract: objective: we are presenting our experience in laparoscopic adrenalectomy, after adopting the laparoscopic technique for 10 years as a primary option for suprarenal surgery. methods: we included 200 laparoscopic adrenal surgeries performed in a consecutive manner in 183 patients with surgical suprarenal pathology between november 1994 and november 2005. sixty-seven (36.6%) patients were male and 116 (63.4%) were female, with an average age of 49.1 years (age range 8 months to 78 years). results: the most frequents clinical diagnosis were hyperaldosteronism (17.5%), metastatic cancer (15.8%), pheochromocytoma (15.3%), cushing syndrome (7.1%), adrenal cyst (4.9%) and myelolipoma (2.7%). a total of 164 total adrenalectomies, 29 partial adrenalectomies and 7 marsupializations of adrenal cysts were performed. mean surgical time was 82.6 minutes (range 25 to 240 minutes) and mean hospitalization time was 2.5 days (range 1-10 days). the size of the suprarenal gland and/or tumor varied between 1 and 14 cm (average 5.6 cm). the rate of complication was 6%. in 8 of the patients, there was another laparoscopic procedure besides the adrenal surgery: cholecystectomies (2), marsupialization of a renal cyst (2), block nephrectomy (2), partial nephrectomy for a tumor (1) and pancreatic cystectomy (1). one patient underwent a right laparoscopic adrenalectomy and an ipsilateral percutaneous nephrolithotomy. conclusion: the accumulated experience with 200 laparoscopic adrenal procedures has allowed the management of endocrine pathologies, such as, aldosteroma, pheochromocytoma, cushing syndrome and rare entities, such as, cysts, myelolipomas in a suitable manner. additionally, it has permitted us to extend the benefits of a minimally invasive procedure for large adrenal masses and selected oncology cases.
Quemaduras en ni?os por volcamiento de cocina
Saavedra O.,Rolando; Contreras N.,Claudia; Cortés P.,Liliana; Cornejo A.,Edith;
Revista chilena de pediatría , 2001, DOI: 10.4067/S0370-41062001000200006
Abstract: at coaniquem burn rehabilitation centre (saniago, chile) 213 children with burns caused by a stove tipping over were attended during a one year period. these accidents occur because the patient or another ci?id leans on an open stove door, tilting the stove and in consequence a pot of hot liquid spills onto the child. this type of injury corresponds to 6.6% of chudren attending the wound care clinic. 151 (70.9%) were males and 177 (83.1%) were toddlers. these injuries caused multiple wounds in 144 (67.7%), the legs being most frequently involved (69.5%). 85 (39.9%) patients were hospitalised in other centres before or after their treatment in coaniquem, owing to the seriousness of their injuries. this rate triplicates that observed in those acute cases attending our institution. 71 out of 117 (60.7%) patients who were hospitalised or had ambulatory surgury remained in scar rehabilitation treatment one year later. the projection of this rate to the whole country seems to justify the adoption of specific preventive measures
Impact of inappropriate antimicrobial therapy on patients with bacteremia in intensive care units and resistance patterns in Latin America
Cortés,J. A.; Garzón,D. C.; Navarrete,J. A.; Contreras,K. M.;
Revista argentina de microbiolog?-a , 2010,
Abstract: patient care in an intensive care unit (icu) is associated with an increased risk of developing nosocomial infections. bacteremia is responsible for a great number of cases, 23% of which have attributable mortality in developed countries and can affect up to 52% of icu patients. the main cause of mortality is inadequate and inappropriate antimicrobial empirical therapy. the incorrect use of antimicrobials is a major risk for identifying multidrug resistant microorganisms, thereby involving increased morbidity, mortality and costs. implementing several surveillance systems and becoming acquainted with resistance patterns represent a valuable tool for identifying, preventing and treating this infectious complication. there is paucity of data regarding antimicrobial resistance in bacteremic patients in latin america, and the available data reveals a worrying scenario.
Quemaduras en ni os por volcamiento de cocina Childhood burns caused by stoves tipping over
Rolando Saavedra O.,Claudia Contreras N.,Liliana Cortés P.,Edith Cornejo A.
Revista chilena de pediatría , 2001,
Abstract: En el Centro de Rehabilitación de COANIQUEM en Santiago de Chile ingresaron en 1998 3 245 ni os, de los cuales 213 ni os sufrieron quemaduras originadas por el volcamiento de una cocina (VC). Se evaluó la incidencia de VC, las características de los afectados, la gravedad de las lesiones y se compararon con los 3 032 pacientes restantes (C). Resultados: VC correspondió al 6,6% de los pacientes. Fueron varones 70,9% en VC y 52,2% en C (p NS); tenían menos de 2 a os 83,1% en VC y 46% en C (p 0,0114). Tenían lesiones múltiples 67,7% de ni os VC y 32,6% de C (p < 0,001); se afectaron con mayor frecuencia las extremidades inferiores en VC (35,4%) y las superiores en C (46,7%). Requirieron hospitalización previa o posterior al ingreso 39,9% en VC y 11,7% en C (p < 001). La profundidad de las quemaduras hizo necesaria una intervención quirúrgica en 54,5% de los afectados por VC y en 22,6% de C. De 117 casos VC hospitalizados u operados 60,7% permanecía en tratamiento de rehabilitación al a o de evolución vs 27,7% de C. Conclusión: El volcamiento de cocina ocasiona un número considerable de quemaduras, especialmente en ni os de 1 a 2 a os, cuya gravedad (mayor hospitalización y necesidad de injertos) aconseja medidas de prevención y mejoría en las características de estos artefactos At COANIQUEM Burn Rehabilitation Centre (Saniago, Chile) 213 children with burns caused by a stove tipping over were attended during a one year period. These accidents occur because the patient or another ci id leans on an open stove door, tilting the stove and in consequence a pot of hot liquid spills onto the child. This type of injury corresponds to 6.6% of chudren attending the wound care clinic. 151 (70.9%) were males and 177 (83.1%) were toddlers. These injuries caused multiple wounds in 144 (67.7%), the legs being most frequently involved (69.5%). 85 (39.9%) patients were hospitalised in other centres before or after their treatment in COANIQUEM, owing to the seriousness of their injuries. This rate triplicates that observed in those acute cases attending our institution. 71 out of 117 (60.7%) patients who were hospitalised or had ambulatory surgury remained in scar rehabilitation treatment one year later. The projection of this rate to the whole country seems to justify the adoption of specific preventive measures
The silver of the South Iberian El Argar Culture: A first look at production and distribution
Bartelheim, Martin,Contreras Cortés, Francisco,Moreno Onorato, Auxilio,Murillo-Barroso, Mercedes
Trabajos de Prehistoria , 2012, DOI: 10.3989/tp.2012.12093
Abstract: More than 700 silver objects are known from the Middle Bronze Age El Argar culture, which contrasts significantly with the rest of Bronze Age Europe, where silver is mostly rare. This has traditionally been explained by the difficulties of extracting silver from complex ores by cupellation and the relative abundance of easily accessible occurrences of native silver and silver chlorides in the south of the Iberian peninsula. However, until now in the Iberian Bronze Age the use of native silver has only been inferred by the absence of evidence of cupellation. The results of trace element analysis of a series of silver objects from several Argaric settlements reveal for the first time positive evidence for the use of native silver. Lead isotope analyses show that hardly any of the objects were made of silver from known and characterised mining districts. Se han documentado más de 700 objetos de plata de la cultura argárica del Bronce Medio. Esta cifra contrasta con la realidad del II milenio AC europeo, donde la plata es muy escasa. Esto se ha explicado tradicionalmente por la dificultad de extraer plata de minerales complejos mediante la técnica de copelación y la relativa abundancia de plata nativa y cloruros de plata fácilmente accesibles en el sur de la Península Ibérica. Sin embargo, hasta ahora, el uso de plata nativa en la Edad del Bronce ibérica se había deducido principalmente por la falta de evidencias de copelación. Los resultados de los análisis de elementos traza de una serie de objetos de plata de varios yacimientos argáricos suministran por primera vez una evidencia positiva del uso de plata nativa. Los análisis de isótopos de plomo demuestran que la mayoría de los objetos no procede de ninguno de los distritos mineros conocidos y caracterizados.
Preliminary study of slags and slaggy layers on ceramics from the Bronze Age metallurgical site of Pe alosa (Ba os de la Encina, Jaén)
Moreno Onorato, Auxilio,Contreras Cortés, Francisco,Renzi, Martina,Rovira Llorens, Salvador
Trabajos de Prehistoria , 2010,
Abstract: This paper offers a revision of the metallurgical processes carried out at the settlement on the basis of a recent analytical study of slags and slagged metallurgical ceramics. These analyses allowed us to identify the ores processed and the characteristics of this metal production. Therefore, the results obtained provide new perspectives to determining what type of technology was developed and the working conditions of the different processes carried out at the site. In this sense, the use of lead-rich copper ores stands out in explaining the presence of high quantities of lead compounds detected in various metallurgical ceramics and in secondary products, like slags and melting wastes. The present study also includes typological and technological analysis of metallurgical ceramic vessels. Este trabajo ofrece una revisión de los procesos metalúrgicos llevados a cabo en el asentamiento I, de acuerdo con los resultados del reciente estudio analítico realizado sobre los restos de escorias y escorificaciones de cerámicas metalúrgicas. A partir de estos análisis, que nos permiten la identificación de los minerales procesados y de las características de la producción metálica obtenida, se aportan nuevas perspectivas para determinar el tipo de tecnología desarrollada y las condiciones en las que se llevaron a cabo los diferentes procesos. En este sentido destaca la utilización de minerales de cobre muy ricos en plomo, que proporcionan altas cantidades de compuestos de plomo en las vasijas cerámicas y en productos secundarios como escorias y restos de fundición. Se completa el estudio con el análisis de la tipología y tecnología de las vasijas cerámicas de uso metalúrgico.
Diálisis con albúmina MARS (Molecular Adsorbent Recirculating System) como puente para el trasplante hepático en insuficiencia hepática fulminante: presentación de 3 casos Albumin dialysis MARS (Molecular Adsorbent Recirculating System) in acute liver failure, before liver transplantation: Report of three cases
Jorge Contreras B,Jaime Poniachik T,Dan Oksenberg R,Claudia Cortés M
Revista médica de Chile , 2004,
Abstract: The most successful therapy for acute liver failure is liver transplantation. However, due to the low number of donors, organ support therapies need to be used as a bridge to liver transplantation. Molecular Adsorbents Recirculating System (MARS) is a dialysis treatment that uses a recirculating dialysate containing albumin. This allows the removal of both hydrosoluble and albumin-related substances. This system improves hepatic encephalopathy, renal dysfunction and some clinical parameters in acute liver failure, but there is no clear decrease in mortality. We report three women aged 23, 21 and 61 years, that were subjected to liver transplantation, in whom this therapy was successfully used (Rev Méd Chile 2004; 132: 601-7).
Impact of inappropriate antimicrobial therapy on patients with bacteremia in intensive care units and resistance patterns in Latin America Impacto de la terapia antimicrobiana inapropiada en pacientes con bacteriemia en unidades de cuidado intensivo y patrones de resistencia en América Latina
J. A. Cortés,D. C. Garzón,J. A. Navarrete,K. M. Contreras
Revista argentina de microbiolog?-a , 2010,
Abstract: Patient care in an intensive care unit (ICU) is associated with an increased risk of developing nosocomial infections. Bacteremia is responsible for a great number of cases, 23% of which have attributable mortality in developed countries and can affect up to 52% of ICU patients. The main cause of mortality is inadequate and inappropriate antimicrobial empirical therapy. The incorrect use of antimicrobials is a major risk for identifying multidrug resistant microorganisms, thereby involving increased morbidity, mortality and costs. Implementing several surveillance systems and becoming acquainted with resistance patterns represent a valuable tool for identifying, preventing and treating this infectious complication. There is paucity of data regarding antimicrobial resistance in bacteremic patients in Latin America, and the available data reveals a worrying scenario. El manejo médico en la unidad de cuidado intensivo (UCI) se asocia con un mayor riesgo de infecciones intrahospitalarias. Las bacteriemias tienen una alta frecuencia en dichas unidades, se presentan hasta en el 52% de los pacientes allí asistidos y en los países desarrollados se les atribuye una mortalidad del 23%, que se debe fundamentalmente al uso de tratamiento empírico inadecuado o inapropiado. El uso incorrecto de los antimicrobianos es uno de los principales factores de riesgo para el desarrollo de la resistencia bacteriana, que conlleva la selección de microorganismos multirresistentes, el aumento de la morbilidad y la mortalidad y el incremento en los días de estancia hospitalaria y del costo por hospitalización. La implementación de diferentes sistemas de vigilancia y el conocimiento de la variabilidad en la resistencia a los antimicrobianos constituyen valiosas herramientas para identificar y prevenir la resistencia a los antibióticos y para orientar la terapéutica. En América Latina disponemos de pocos datos sobre las tasas de resistencia y aquellos disponibles muestran un panorama preocupante.
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