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Search Results: 1 - 10 of 9354 matches for " Carolina;Villanueva Tagle "
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Estudio de la contaminación por metales en sedimentos acuáticos de la Bahía de Matanzas
Quevedo, Odalys;Gómez, Jorge;Ramírez, Carmen;Estrada, Tamara;Moreno, Carlos;Mendiguchía, Carolina;Villanueva Tagle, Margarita Edelia;Pomares Alfonso, Mario Simeón;
Química Nova , 2012, DOI: 10.1590/S0100-40422012000500012
Abstract: surface sediments of the bay of matanzas (cuba) were studied to assess its environmental quality by using several criteria (metal content index, pollution load index and sediment quality guidelines). two partial digestion sediment procedures and a modified bcr sequential extraction were used. the concentrations of metals were measured by atomic spectroscopy methods. the founded contents of cu (2,4-27,9 mg kg-1), zn (2,5-55,5 mg kg-1) and ni (8,8-99,2 mg kg-1) were below those reported by other authors. the results obtained suggested that the most polluted sites were 3, 5, and 6. the sequential extraction procedure showed that most of the studied metals were associated to the more stable fractions.
Fístula arteriovenosa espinal: Case report and review
Mantilla,Mirko; Villanueva,Pablo; Mellado,Patricio; Tevah,José; Tagle,Patricio;
Revista chilena de neuro-psiquiatría , 2003, DOI: 10.4067/S0717-92272003000100004
Abstract: we report a case of thoracic spinal arteriovenous fistula. clinical features, diagnostic methods and treatment options are reviewed. we conclude that the goal of surgery is vein occlusion. the surgery seems to have better results in the long-term, achieving either stabilization or improvement of neurological symptoms
Metástasis cerebral y sobrevida
Lovo I,Eduardo; Torrealba M,Gonzalo; Villanueva G,Pablo; Gejman,Roger; Tagle M,Patricio;
Revista médica de Chile , 2005, DOI: 10.4067/S0034-98872005000200006
Abstract: background: brain metastases are the most common cerebral tumors, have a poor prognosis and their incidence is five times higher than primary brain tumors. aim: to analyze the survival of patients with the diagnosis of brain metastases, operated in our institution. patients and methods: we retrospectively reviewed all patients operated from january 1989 to december 2001, whose pathological diagnosis confirmed the presence of cerebral metastases. the death date of each patient was obtained from the analysis of death certificates, obtained from the computerized national registry. results: in 46 operated patients, the date of death was determined. in 23 of them, information about primary site of malignancy, type of surgery performed and adjunctive treatment with holocerebral radiotherapy (rt) was obtained. the overall median survival time of the 46 patients was 29 weeks (range 4207). thirty percent of patients were alive one year after surgery. among those patients with complete clinical information, the median survival of 16 patients who received postoperative rt was 41 weeks (range 12207), compared to a survival of 18 weeks (range 872), among those that did not receive rt (p = 0.04). conclusions: the median survival for patients operated for cerebral metastases in our institution is 29 weeks. those who are operated and receive rt, have a longer survival, than those who did not receive rt (rev méd chile 2005; 133: 190-4)
Comparison of USEPA 3050B and ISO 14869-1: 2001 digestion methods for sediment analysis by using FAAS and ICP-OES quantification techniques
Navarro, Elvira Maria Galí;Tagle, Margarita Edelia Villanueva;Marín, Maria Teresa Larrea;Alfonso, Mario Simeón Pomares;
Química Nova , 2011, DOI: 10.1590/S0100-40422011000800025
Abstract: a study of the partial usepa 3050b and total iso 14869-1:2001 digestion methods of sediments was performed. usepa 3050b was recommended as the simpler method with less operational risk. however, the extraction ability of the method should be taken in account for the best environmental interpretation of the results. faas was used to quantify metal concentrations in sediment solutions. the alternative use of icp-oes quantification should be conditioned by a previous detailed investigation and eventual correction of the matrix effect. for the first time, the eid method was employed for the detection and correction of the matrix effect in sediment icp-oes analysis. finally, some considerations were made about the level of metal contamination in the area under study.
Caracterización de la biomasa inactiva de Aspergillus niger O-5 como sorbente de Pb (II)
Horrutiner, Yusleydi Enamorado;Tagle, Margarita Villanueva;Díaz, Ianeya Hernández;Pérez, Orquídea Coto;Alfonso, Mario S. Pomares;
Química Nova , 2011, DOI: 10.1590/S0100-40422011000700007
Abstract: the inactive biomass of fungus aspergillus niger o-5 obtained in cuba was characterized as sorbent of pb2+ by several structural analysis and others techniques. in addition, the biomass was studied for the separation / preconcentration of pb2+ from aqueous solution. the maximum biosorption capacity was obtained for the contact time of 30 min and ph 5. the kinetic of sorption process occurred according to the model of ho. the freundlich or langmuir models suitably described the experimental adsorption isotherms. the biomass can be used as sorbent for pb2+ with a maximum capacity of 4.7 - 6.2 mg g-1. the pretreatment with naoh solution improved its sorption capacity.
Resección de lesiones cerebrales con asistencia de mapeo cortical intraoperatorio
Mery,Francisco; Zarate,Adrián; Fadic,Ricardo; Lorenzoni,José; Elgueta,Francisca; Villanueva,Pablo; Rojas,Ricardo; Tagle,Patricio;
Revista chilena de neuro-psiquiatría , 2010, DOI: 10.4067/S0717-92272010000400003
Abstract: introduction: extensive resection for malignant intraaxial intracranial tumors has been demonstrated to improve survival. this is not always possible due to potential tumor location in or next to eloquent brain regions, like primary motor cortex or speech areas. in this case, avoiding neurological deficits is challenging. one of the tools for minimizing that risk is intraoperative cortical mapping (icm). this report describes the icm technique of eloquent brain regions, feasibility and complementariness with other methods for tumor localization. methods: seven patients with brain lesions near eloquent regions operated on were analyzed. frameless stereotaxis (neuronavigation) and intraoperative cortical mapping (direct cortical stimulation and monitoring of somatosensory evoked potentials) were used. the location, size, type of lesion, amount of resection, pre and postoperative neurological status were studied. results: icm was effective in localizing primary motor cortex in all patients. in 6 patients the tumor area without functionality was removed, achieving complete or greater than 90% resection in 5 of them. in one patient the lesion was a deep arteriovenous malformation located below the primary motor cortex. in this case icm made feasible an approach from non-eloquent cortex to achieve total resection. no new postoperative deficit was found in a 12 month follow-up period. conclusion: icm is useful and localize functional cortical regions effectively, simply and reliably, making possible to perform extensive tumor resections in eloquent regions. this technique is complementary to other tools for anatomical or physiological localization and could contribute to a safer and more effective surgery.
Hematoma de fosa posterior no traumático: consideraciones clínicas y terapéuticas
Tagle,Patricio; Vintimilla,Luis Carlos; Del Villar,Sergio; Torrealba,Gonzalo; Villanueva,Pablo; Méndez,Jorge; Rey,Sergio;
Revista chilena de neuro-psiquiatría , 2002, DOI: 10.4067/S0717-92272002000200006
Abstract: fifty two patients (28 male and 24 female) with non-traumatic posterior fossa hematomas were analyzed. average age of the patients was 60 years old. in ten cases (19.2%), the hematomas were secondary to arteriovenous malformations (5), cavernomas (3), venous angiomas (1) and hemangioblastoma (1). forty two (80.7%) were considered primary, with a history of high blood pressure in 31 patients and coagulation disorders in 5. six cases had no predisposing factors. most subjects also had intercraneal hypertension (84%). computerized tomography showed hematomas in all cases, of which four were under 2 cm in size, 24 were between 2 and 3 cm, and 24 were larger than 3 cm. hydrocephalus was present in 22 cases (42.3%). twelve patients underwent digital angiography, with favorable results in seven (5 arteriovenous malformations, 1 venous angioma and 1 hemangioblastoma). magnetic resonance imaging was done with two patients, and showed one cavernous angioma. thirty-one patients underwent surgery; the hematoma was drained in 24 cases, 14 of which involved lcr draining. the remaining cases were treated for hydrocephalus only. favorable results were seen in 67.3% of the cases, and the overall mortality rate was 9.6%. surgical mortality was 12.5%. the initial state of consciousness and size had a bearing on results. we believe that treatment must be evaluated on a case-by-case basis, since no single factor has an absolute effect on a patient's outcome
Hiperparatiroidismo primario: presentación de un caso y revisión de la literatura
GARFIAS VON F,CAROLINA; VILLANUEVA T,SOLEDAD; UGARTE P,FRANCISCA;
Revista chilena de pediatría , 2011, DOI: 10.4067/S0370-41062011000400008
Abstract: hypercalcemia is infrequent in pediatrics, causes include mutations of calcium sensing receptor (casrs), pt adenoma or hyperplasia, d or a hypervitaminosis, inborn errors of metabolism, parenteral nutrition, and others. objective: to report a case of severe hypercalcemia in a adolescent due to primary hyperparathyroidism. case: fourteen years old adolescent girl with 2 weeks of weight loss, polyuria, malaise and emotional lability. laboratory reveals hypercalcemia (16.6 mg/dl), hypophosphemia (2.2 mg/dl) and elevated pth (450 pg/ml). management of severe hypercalcemia at icu was done. pt scintigraphy study reveals increased uptake in the lower pole of right thyroid lobe. right inferior parathyroidectomy was performed and biopsy revealed right lower parathyroid hyperplasia. discusion: primary hyperparathyroidism (hpt) is an uncommon condition in children. the main causes are parathyroid adenomas or hyperplasia, frequently one or two pt glands involved. hpt must be suspected in symptomatic hypercalcemia, nephrourinary symptoms in scholars and adolescents (polyuria and nephrolithiasis) and in newborn with pathologic fractures and costal rosary. the pathogenesis includes mutations in casrs, cyclin d1/prad 1 and men 1 genes.
Hiperparatiroidismo primario: presentación de un caso y revisión de la literatura Primary hyperparathyroidism: clinical case and literature review
CAROLINA GARFIAS VON F,SOLEDAD VILLANUEVA T,FRANCISCA UGARTE P
Revista chilena de pediatría , 2011,
Abstract: La hipercalcemia es infrecuente en pediatría, existen diferentes causas que incluyen mutaciones del receptor sensible al calcio (CaSRs), adenoma o hiperplasia de PT, hipervitaminosis D o A, errores congénitos del metabolismo, nutrición parenteral total, etc. Objetivo: Comunicar un caso de hipercalcemia severa en una adolescente causado por un hiperparatiroidismo primario. Caso: Escolar de 14 a os con cuadro de 2 semanas de baja de peso, poliuria, compromiso del estado general y labilidad emocional. Los exámenes revelaron hipercalcemia (16 mg/dl), hipofosfemia (2,2 mg/dl) y PTH elevada (450 pg/ml). Se hospitalizó para manejo de hipercalcemia severa, con diagnósticos de Hiperparatiroidismo primario. Se completó estudio con cintigrama de PT, encontrando hipercaptación en polo inferior de lóbulo tiroideo derecho. Se realizó una paratiroidectomia inferior derecha y la biopsia reveló hiperplasia de paratiroides inferior derecha. Discusión: El hiperparatiroidismo primario es una condición infrecuente en ni os. Las principales causas son adenomas o hiperplasia de paratiroides, frecuentemente con 1 o dos glándulas PT comprometidas. Debe sospecharse en casos de hipercalcemia sintomática, escolares o adolescentes con síntomas nefrourinarios (poliuria importante y nefrolitiasis) y frente a un recién nacido grave, con fracturas patológicas o rosario costal. La etiopatogenia incluye mutaciones del gen CaSRs, Ciclin D1/PRAD 1 y el MEN 1. Hypercalcemia is infrequent in pediatrics, causes include mutations of calcium sensing receptor (CaSRs), PT adenoma or hyperplasia, D or A hypervitaminosis, inborn errors of metabolism, parenteral nutrition, and others. Objective: To report a case of severe hypercalcemia in a adolescent due to primary hyperparathyroidism. Case: Fourteen years old adolescent girl with 2 weeks of weight loss, polyuria, malaise and emotional lability. Laboratory reveals hypercalcemia (16.6 mg/dl), hypophosphemia (2.2 mg/dl) and elevated PTH (450 pg/ml). Management of severe hypercalcemia at ICU was done. PT Scintigraphy study reveals increased uptake in the lower pole of right thyroid lobe. Right inferior parathyroidectomy was performed and biopsy revealed right lower parathyroid hyperplasia. Discusion: Primary hyperparathyroidism (HPT) is an uncommon condition in children. The main causes are parathyroid adenomas or hyperplasia, frequently one or two PT glands involved. HPT must be suspected in symptomatic hypercalcemia, nephrourinary symptoms in scholars and adolescents (polyuria and nephrolithiasis) and in newborn with pathologic fractures and costal
EVALUACIóN DEL NIVEL DE ADOPCIóN DE INTERNET EN LAS UNIVERSIDADES CHILENAS EN BASE AL MODELO eMICA
Cerpa,Narciso; Ruiz-Tagle,Andrés; Cabrera,Carolina; Hadweh,Pamela; Vergara,Fabián;
Ingeniare. Revista chilena de ingeniería , 2007, DOI: 10.4067/S0718-33052007000300007
Abstract: the main objective of this study is to investigate the degree of internet technologies adoption in by chilean universities. these universities use the web as a promotion system and for the coordination of their operational activities, highlighting the role of this technology in the effective communication between the different social actors that interact with the university, namely, enterprises, institutions, people and potential students. this web-based platform plays also an important role in daily communication among administrative staff, faculty, and students. this study analyses all the chilean universities' websites, applying the extended model of internet commerce adoption (emica) [3]. the results from this study show that in general, the universities make a wide use of internet technologies, which allows most of these institutions (98.3%), to do their promotion and also provide information with a high degree of sophistication and interactivity (stage 2, level 3 of the emica model). a large percentage (75%) of the chilean universities show a high degree of internet technologies adoption, since they have application systems (administrative, academic, promotional, etc.), that support the execution of transactions via the web, therefore, they are in the highest stage of the emica model, transaction processing.
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