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Search Results: 1 - 10 of 12264 matches for " Pablo Parra "
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El alca: Ilusión o realidad?
Juan Pablo Parra Rojas
Revista Opera , 2003,
Abstract:
An Efficient Synthesis of γ-Aminoacids and Attempts to Drive Its Enantioselectivity
Salvador Gil,Margarita Parra,Pablo Rodríguez
Molecules , 2008, DOI: 10.3390/molecules13040716
Abstract: Addition of carboxylic acid dianions to bromoacetonitrile lead, in good yields,to the corresponding γ-cyanoacids, which on hydrogenation yielded γ-aminoacids. Thistwo step methodology improves upon previously described results. Poor e.e’s resultedfrom our attempts to drive the enantioselectivity of this transformation by chiral amideinduction.
Diagnóstico y Manejo Oportuno del Síndrome de HELLP
Parra- Ramírez,Pablo; Beckles- Maxwell,Mario;
Acta Médica Costarricense , 2005,
Abstract: the hellp syndrome of haemolysis, elevated liver enzymes and low platelets is a major complication of pregnancy. ten percent of pregnancies complicated by severe preeclampsia and eclampsia are affected by hellp syndrome. hellp syndrome has been described as firts appearing from the mid second trimester of pregnancy until severe days postpartum. approximately one third of patients will have their first manifestation of hellp syndrome diagnosed postpartum. of the two thirds of women who are first diagnosed with hellp syndrome antepartum, 10% will be identified before 27 weeks, 20% in pregnacies beyond 37 weeks, and the majority, 70%, occurring between 27 and 37 weeks gestation. the maternal mortality has been reported to be as high as 24% and perinatal mortality can range as high as 30-40%. the early diagnosis and treatment of hellp syndrome remains problematic for the obstetric health care provider. the non-especific signs and symptoms of this disorder early in the disease process make the accurate diagnosis difficult and delays early treatment, which has the best prognosis for both maternal and perinatal outcome. the management of the pregnancy complicated by hellp syndrome requires early recognition and the institution of the appropriate therapy.
DISTRIBUCIóN DE METALES PESADOS (Pb, Cd Y Zn) EN PERFILES DE SEDIMENTO ASOCIADO A RHIZOPHORA MANGLE EN EL RíO SEVILLA - CIéNAGA GRANDE DE SANTA MARTA, COLOMBIA
Pablo Parra,Juan; Fernanda Espinosa,Luisa;
Boletín de Investigaciones Marinas y Costeras - INVEMAR , 2008,
Abstract: in order to evaluate the vertical distribution of the heavy metals pb, cd, and zn in sediments associated to rhizophora mangle plants, potentially bioavailable and not bioavailable concentrations of these metals were determined in three sediment cores collected in the sevilla river, ciénaga grande de santa marta. measurements were carried out by inductively coupled plasma-atomic emission spectrometry. the results showed that in sevilla river mangrove ecosystem these metals are accumulated principally in non-bioavailable forms, this means that a great part or them are retained in the sediment. the retention of pb, cd, and zn in the sediments of this mangrove ecosystem is bly related to the physicochemical parameters ph, salinity, and redox potential, and to organic matter, and silt and clays contents.
Diagnóstico y Manejo Oportuno del Síndrome de HELLP
Pablo Parra- Ramírez,Mario Beckles- Maxwell
Acta Médica Costarricense , 2005,
Abstract: El síndrome de HELLP (SH) que según sus siglas en inglés consiste en hemólisis, aumento enzimas hepáticas y trombocitopenia, es una de las complicaciones maternas y fetales más graves durante el embarazo. El 10% de los embarazos complicados con preeclampsia severa o eclampsia son afectados por el SH. Este síndrome ha sido descrito desde la mitad del segundo trimestre hasta varios días posparto. Aproximadamente un tercio de los pacientes van a desarrollar sus primeras manifestaciones de SH hasta varios días posparto. De los dos tercios de mujeres que son diagnosticadas con SH en el anteparto, el 10% se presentan antes de las 27 semanas, el 20% luego de las 37 semanas y el 70% ocurren entre las 27 y 37 semanas de gestación. La mortalidad materna ha sido reportada en un 24% y la perinatal en un 30-40%. El diagnóstico y manejo temprano del SH resulta un problema para los profesionales en obstetricia, esto debido principalmente a la falta de signos y síntomas específicos, lo cual retarda el adecuado manejo de ésta patología si no se diagnostica en sus inicios o adecuadamente. El manejo de embarazos complicados con el SH requiere de un reconocimiento temprano y de un tratamiento apropiado. The HELLP syndrome of haemolysis, elevated liver enzymes and low platelets is a major complication of pregnancy. Ten percent of pregnancies complicated by severe preeclampsia and eclampsia are affected by HELLP syndrome. HELLP syndrome has been described as firts appearing from the mid second trimester of pregnancy until severe days postpartum. Approximately one third of patients will have their first manifestation of HELLP syndrome diagnosed postpartum. Of the two thirds of women who are first diagnosed with HELLP syndrome antepartum, 10% will be identified before 27 weeks, 20% in pregnacies beyond 37 weeks, and the majority, 70%, occurring between 27 and 37 weeks gestation. The maternal mortality has been reported to be as high as 24% and perinatal mortality can range as high as 30-40%. The early diagnosis and treatment of HELLP syndrome remains problematic for the obstetric health care provider. The non-especific signs and symptoms of this disorder early in the disease process make the accurate diagnosis difficult and delays early treatment, which has the best prognosis for both maternal and perinatal outcome. The management of the pregnancy complicated by HELLP syndrome requires early recognition and the institution of the appropriate therapy.
Patrón de comportamiento de monos ardilla (Saimirí sciureus macrodon) cautivos con diferentes enriquecimientos ambientales
Parra-Herra,Juan Pablo; Estrada-Cely,Gloria Elena;
CES Medicina Veterinaria y Zootecnia , 2011,
Abstract: the implications of captivity on animal behavior have been well documented, but few resources exist to alter its effect. this first experience, carried out at the wildlife foster home of the universidad de la amazonía and corpoamazonía, in florencia, caquetá, in addition to describing behavioral and activity patterns expressed by the captive squirrel monkey (saimiri sciureus macrodon) in comparison with specimens in the wild, established mechanisms for conduct modulation, based on the use of environmental enrichments. research conducted on a group of twelve specimens, in different stages of biological development and confined to an enclosure no larger than four square meters, found through the application of ethograms that the captive specimens' daily activities vary widely and that a great many stereotypes were evident at feeding times (morning hours). these behaviors were able to be modulated by environmental enrichments (ee). results show the presence of significant differences in behavior and activity between captive specimens and those in the wild, as well as differences in weight ranges, body temperature and glucose levéis, being higher in captive specimens, which indicate that factors such as changes in diet and the stress of captivity are causing homeostatic imbalance of s. sciureus.
Condición física de suelos en diferentes sistemas de manejo agrícolas del centro sur de Córdoba
Parra,Baltazar Jorge; Becker,Analía Rosa; Cantú,Mario Pablo;
Ciencia del suelo , 2011,
Abstract: numerous degradation processes affect the soil in the south central province of córdoba, being physical processes among the most important ones. our objective was to characterize the physical condition of general deheza typic haplustolls. eleven sites from the area were selected, two under low disturbed conditions (nat) and nine cultivated sites under the predominant soil use and management in the area. these nine sites were clustered through surveys in: sd: no tillage, sdmn1: no tillage except peanut, sdmn2: similar to sdmn1 with paratill or disk harrow tillage every two or three years, lr: disk harrow and chisel tillage. soil properties measured in ap and bw horizons were: organic carbon (co), bulk density (da), maximum compaction (damax) and critical water content (hc), basic infiltration rate (vib), mean weight diameter of water stable aggregates (dmp) and their percentage (%ae). in sd, co was concentrated in the ap horizon. nat had the lower da and the rest of the treatments did not differ among each other. da was lower in ap horizons than in bw horizons. damax and hc were related negatively and positively respectively. the co vs. damax relationship was only significant at 10 g kg-1 or higher co values. both dmp and %ae were higher in nat; within the cultivated sites dmp and %ae were higher for sd, although %ae from sd did not differ statistically from lr. the vib was significantly higher in nat than in sdmn2 and sd, and lr with sdmn1 had the minimum value. agriculture management systems affected the soil physical condition in south central córdoba mainly through a change in the distribution of organic carbon.
Loxosceles laeta, identificación y una mirada bajo microscopía de barrido
PARRA,DEMITRI; TORRES,MARISA; MORILLAS,JOSE; ESPINOZA,PABLO;
Parasitología latinoamericana , 2002, DOI: 10.4067/S0717-77122002000100019
Abstract: loxosceles laeta is a spider of importance in chile and produce hight morbilethality in humans. the majority of the patients with a spider bite go to primary attention and to the emergency room. it is very important to know the morphology of the spider in order to be prompt identify and make a correct management of the patients. we showed its morphology in a photography of scanning electronic microscopy that detach its most fundamental aspects, like its six eyes located in a triangular disposition
Trasplante heterotópico de corazón en ratas. Desarrollo de un modelo de microcirugía
OLIVARES R,GABRIEL; PARRA D,CLAUDIO; TRONCOSO C,PABLO;
Revista chilena de cirugía , 2008, DOI: 10.4067/S0718-40262008000300005
Abstract: introduction: heterotopic heart transplantation in rats is an experimental research model, specially used to study immunosuppression. aim: to develop a model of heterotopic heart transplantation in rats. material and methods: lewis rats (as receptors) and brown norway rats (as donors), weighing 200 to 350 g, were used. for procurement, a butterfly chest incisión was done, a metallic clip was placed in inferior and superior vena cava to infuse a physiologic solution with heparin, stopping cardiac beats and sectioning pulmonary and aortic arteries. pulmonary and cava veins were ligated jointly and sectioned. in the receptor rats, aorta and abdominal vena cava were identified and an atraumatic bulldog vascular clamp was placed. termino lateral anastomoses between donor ascending aorta and receptor abdominal aorta, and between donor pulmonary artery and receptor vena cava were performed with continuous microsuture. transplantation was considered successful when the graft was functional for more than 24 hours, determined palpating beats in the abdomen. results: eighty rats were transplanted. we main causes of graft loss were a prolonged operative time and postoperative hemorrhage. the technique was modified, using a unique ligation of cavas and pulmonary veins, elliptic and lateral venotomy, ligation of a vessel that is parallel to aorta that avoids lethal hemorrhages and postoperative fluid replacement. discussion: this is a reproducible model. the technical modifications introduced, reduce the lapse of ischemia and increase graft survival
Prevalencia y clasificación de enfermedad renal crónica en pacientes con diabetes mellitus tipo 2 en el centro comunitario de salud familiar Pantanosa, Frutillar
Villarroel R,Pablo; Parra L,Ximena; Ardiles A,Leopoldo;
Revista médica de Chile , 2012, DOI: 10.4067/S0034-98872012000300002
Abstract: background: type 2 diabetes mellitus is the main cause of chronic kidney disease in developed countries. aim: to study the prevalence of chronic kidney disease among adults with diabetes mellitus attended at a public primary health care clinic in southern chile. material and methods: one hundred patients with type 2 diabetes mellitus, aged more than 15 years participated in this cross sectional study. chronic kidney disease was defined as the presence of a urine albumin/creatinine ratio over 30 mg/g or an estimated glomerular filtration rate of less than 60 ml/min/1,73 m2, detected in at least two opportunities, separated at least by three months. results: thirty four percent of participants had chronic kidney disease (17% stage 1 or 2 and 17% stage 3). thirty percent of participants had an abnormal urinary albumin/creatinine ratio. halfof the patients with an estimated glomerular filtration rate below 60 ml/min/1,73 m2, had a normal urinary albumin/creatinine ratio. conclusions: the rates of chronic kidney disease in this group of diabetic patients are very similar to those reported elsewhere.
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