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Search Results: 1 - 10 of 407818 matches for " Olga M.; Aristizábal "
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Primer reporte de susceptibilidad del clon de caucho natural FX-3864 a Microcyclus ulei en la altillanura colombiana
García,Ibonne A.; Castro,Olga M.; Aristizábal,Fabio; Tapiero,Aníbal L.;
Revista Colombiana de Biotecnología , 2011,
Abstract: south american leaf blight (salb), caused by microcyclus ulei (anamorph fusicladium macrosporum), is an endemic major disease of the rubber tree (hevea brasiliensis) in america. as well as in other crop systems, its management on rubber plantations relies on plant genetic resistance availability, among other means. fx 3864 is a rubber tree clone widely planted in colombia due to its production capability and disease resistance. during 2010 salb symptoms developed in commercial crops at the meta region of colombia. crop traps located nearby the plantations showed mean disease severity levels of 5.78%. once the causal organism was microscopically confirmed as responsible for the diseased tissue, their origin was characterized by molecular means using 4 microsatellites specific to the rubber tree. the procedure confirmed that fx 3864 was the clone of origin of the leaf tissue. salb occurring over fx 3864 implies the need to redirect crop disease management measures to be followed on the new development areas of rubber cultivation, warning growers about potential hazards of disease incidence.
Primer reporte de susceptibilidad del clon de caucho natural FX-3864 a Microcyclus ulei en la altillanura colombiana
García Ibonne Aidee,Castro Olga M.,Aristizábal Fabio,Tapiero Aníbal L.
Revista Colombiana de Biotecnología , 2011,
Abstract: First report of susceptibility of natural rubber clone FX-3864 a Microcyclus ulei en la altillanuera colombiana Resumen El mal suramericano de las hojas (SALB), enfermedad endémica del caucho (Hevea brasiliensis), es causado por Microcyclus ulei (forma imperfecta Fusicladium macrosporum) y constituye el principal limitante del cultivo en América, área donde el microorganismo patógeno es endémico. En forma semejante al de otros cultivos agrícolas, el manejo de esta enfermedad está condicionado a la disponibilidad de resistencia genética en el hospedero. En razón de su productividad y condición de resistencia genética, el clon FX 3864 ha sido ampliamente plantado en zonas con diferente potencialidad epidémica a la incidencia del SALB en Colombia, particularmente las denominadas de “no escape” a la enfermedad. Durante el 2010, plantaciones con el clon FX 3864 en fase productiva presentaron síntomas de SALB en zonas de escape ubicadas en la altillanura colombiana (departamento del Meta). En parcelas trampa ubicadas en áreas aleda as a los cultivos se estableció que la severidad promedio de la enfermedad alcanzó niveles de 5,78% en este clon. Verificada la causalidad de la enfermedad mediante observaciones al microscopio se procedió a confirmar el origen del material sobre el cual se desarrollaban las lesiones, utilizando marcadores moleculares (4 microsatélites específicos). Los resultados de la prueba permitieron confirmar la susceptibilidad del hasta hace poco resistente clon FX 3864 al SALB en Colombia. Se sugiere tomar en consideración la nueva condición de este clon y, en concordancia, reorientar los programas de fomento del cultivo advirtiendo a los agricultores sobre los riesgos potenciales de ocurrencia de la enfermedad en las nuevas áreas programadas. Palabras clave: SALB, Hevea brasiliensis, Fusicladium macrosporum, cultivo de caucho. Abstract South American Leaf Blight (SALB), caused by Microcyclus ulei (anamorph Fusicladium macrosporum), is an endemic major disease of the rubber tree (Hevea brasiliensis) in America. As well as in other crop systems, its management on rubber plantations relies on plant genetic resistance availability, among other means. FX 3864 is a rubber tree clone widely planted in Colombia due to its production capability and disease resistance. During 2010 SALB symptoms developed in commercial crops at the Meta region of Colombia. Crop traps located nearby the plantations showed mean disease severity levels of 5.78%. Once the causal organism was microscopically confirmed as responsible for the diseased tissue, their or
Características clínicas y videofluoroscópicas de la disfagia orofaríngea en ni os entre un mes y cinco a os de vida. Hospital Universitario San Vicente de Paúl, Medellín, Colombia, 2004 Clinical and videofluoroscopic characteristics of oropharyngeal dysphagia in children aged 1 month to 5 years. A study in Medellín, Colombia, 2004
Olga Francisca Salazar Blanco,Dulfary Serna Aristizábal,Angela Múnera Pineda,María Mercedes M. Mejía Rodríguez
Iatreia , 2008,
Abstract: Objetivo: describir, con base en las evaluaciones clínica y videofluoroscópica, las alteraciones biomecánicas más frecuentes en un grupo de ni os entre un mes y cinco a os de edad, con sospecha clínica de trastorno de la deglución (TD) en el Hospital Universitario San Vicente de Paúl (HUSVP). Metodología: estudio descriptivo de una muestra consecutiva entre enero 1 y diciembre 31 de 2004. La información se obtuvo con una encuesta estructurada. Se analizaron las siguientes variables: edad, sexo, antecedentes personales y evaluaciones clínica y videofluoroscópica de las fases de la deglución. Se hizo análisis estadístico con el software SPSS 11.0. Resultados: se estudiaron 68 pacientes con TD, 40 de ellos (58,8%) varones; a 48 se les hizo videofluoroscopia. Cincuenta y cuatro (79,4%) tenían edades entre 1-24 meses. Treinta ni os (44,1%) tenían diagnóstico de parálisis cerebral; once (16,2%) presentaban anomalías congénitas estructurales de la orofaringe; 57 (83,8%) sufrían de alteraciones gastrointestinales, principalmente rehusar la alimentación y reflujo gastroesofágico. Del total de 68 ni os, 27 (39,7%) tenían historia de neumonía recurrente y 11 (16,2%) presentaban antecedentes de otras condiciones respiratorias. No se encontraron diferencias estadísticamente significativas en la evaluación radiológica de la fase faríngea en los ni os con y sin neumonía recurrente. La sensibilidad de la evaluación clínica de la fase oral fue 90% y la de la fase faríngea, 91,6%. No se encontró concordancia entre los exámenes clínico y radiológico del trastorno de deglución (Kappa 5,6%, intervalo de confianza del 95% (-0,042-0,154). Objective: to describe, based on clinical and videofluoroscopic evaluations, the most frequent biomechanical alterations in a group of children, aged 1 month to 5 years, with the clinical suspicion of swallowing disorders. Methodology: descriptive study of a consecutive sample of 68 patients, between January 1 and December 31, 2004, at a children′s hospital in Medellín, Colombia. Information was obtained by means of a structured survey. The following variables were analyzed: age, sex, personal medical history, and clinical and videofluoroscopic evaluations of the swallowing phases. Statistical analysis was carried out by means of the SPSS 11.0 software. Results: out of the 68 patients 40 (58.8%) were males. Children between 1- 24 months represented 79.4% of the group. Videofluoroscopy was carried out in 48. Thirty children (44.1%) suffered from cerebral palsy; 11 (16.2%) had congenital oropharyngeal anomalies; 57 (83.8%) had gastrointesti
EVALUACIóN DE LA VARIABILIDAD GENéTICA DE CLONES DE CAUCHO NATURAL PRESENTES EN LA COLECCIóN CLONAL DEL INSTITUTO SINCHI, MEDIANTE EL USO DE DESCRIPTORES MORFOLóGICOS
Quesada-Méndez,Isaac; Quintero-Barrera,Lorena; Aristizábal,Fabio A.; Rodríguez-Acu?a,Olga;
Colombia Forestal , 2011,
Abstract: genetic diversity of natural rubber clones of the in sinchi institute’s clone collection was assessed. clones of hevea brasiliensis (willd. ex adr. de juss.) muell.arg., hevea spp. (h. brasiliensis x h. benthamiana), and three more species of hevea genus are a part of the collection. seventy-two materials were characterized with twenty-eight morphological descriptors. they were later used to generate a similarity matrix through the analysis of multi-categorical variables, and to obtain clusters based on the matrix. a low variability between clones of h. brasiliensis and h. spp. was observed, presumably because of the direct descendants of most of the materials from crosses of parental pb 80, pb 5/51, pb 49 and tjir, exception made of clone gu 1410. clustering between some materials product of exclusive cross of pb series, a group between clones descendants of parental clones pb 86, and clustering between descendants of parental clones pb 5/51, were observed. clones from other species of hevea differ from this big group.
Características clínicas y videofluoroscópicas de la disfagia orofaríngea en ni?os entre un mes y cinco a?os de vida. Hospital Universitario San Vicente de Paúl, Medellín, Colombia, 2004
Salazar Blanco,Olga Francisca; Serna Aristizábal,Dulfary; Múnera Pineda,ángela; Mejía Rodríguez,María Mercedes; álvarez Escobar,Paola; Cornejo Ochoa,William; Cabrera Hemer,Dagoberto;
Iatreia , 2008,
Abstract: objective: to describe, based on clinical and videofluoroscopic evaluations, the most frequent biomechanical alterations in a group of children, aged 1 month to 5 years, with the clinical suspicion of swallowing disorders. methodology: descriptive study of a consecutive sample of 68 patients, between january 1 and december 31, 2004, at a children's hospital in medellín, colombia. information was obtained by means of a structured survey. the following variables were analyzed: age, sex, personal medical history, and clinical and videofluoroscopic evaluations of the swallowing phases. statistical analysis was carried out by means of the spss 11.0 software. results: out of the 68 patients 40 (58.8%) were males. children between 1-24 months represented 79.4% of the group. videofluoroscopy was carried out in 48. thirty children (44.1%) suffered from cerebral palsy; 11 (16.2%) had congenital oropharyngeal anomalies; 57 (83.8%) had gastrointestinal alterations, the most frequent of which were gastroesophageal reflux and refusal to feed. in 27 (39.7%) there was history of recurrent pneumonia, and 11 (16.2%) more suffered from other respiratory conditions. no significant differences were found in the radiological evaluation of the pharyngeal phase of swallowing between children with or without recurrent pneumonia. sensitivity of the clinical evaluation was 90% for the oral phase of deglutition, and 91.6% for the pharyngeal phase. there was no agreement between the clinical and radiological evaluations of the swallowing disorder (kappa 5.6, 95% confidence interval (-0.042-0.154).
EDITORIAL
Olga Patricia Nore?a Aristizábal
Hacia la Promoción de la Salud , 2008,
Abstract:
Frecuencia de alelos HLA de clase I y II en una cohorte de pacientes con espondiloartritis provenientes del noroccidente colombiano
Velásquez,Eliana Patricia; Quintero,Julio César; Aristizábal,Beatriz Helena; Rincón,Olga Lucía; Velásquez,Carlos Jaime; Pinto,Luis Fernando; Márquez,Javier Darío;
Biomédica , 2012,
Abstract: introduction. spondyloarthritis is a chronic rheumatic disease that affect the axial skeleton and peripheral joints, along with several extra-articular manifestations. the association with hla-b27 remains one of the strongest known links between these entities and the major histocompatibility complex. however, the global distribution of hla-b27 varies considerably and furthermore, associations with non-hla-b27 genes have been described. objective. the frequency of hla class i and ii was determined in a population of patients with spondyloarthritis with respect to detection in the clinical setting and by radiology. materials and methods. a descriptive, observational, cross-sectional, retrospective and prospective study was conducted in 56 patients from northwestern colombia. each was diagnosed with spondyloarthritis between 2005 and 2008. in each case, alleles were identified for the loci hla class i and ii (hla-b; hladqb1 and hladrb). the frequency of these alleles in the axial, peripheral, extraarticular and radiological manifestations. results.the frequency of hla-b27 was 50% overall, and it was the most frequent allele. the two other alleles were hla.drb4*01 at 35.7% and hla-dqb1*0501 at 28.6%, as detected in each of the clinical and radiological manifestations. a high frequency of hla-b27 and hla-drb4*01 (64.3%) was noted in patients with dactylitis. conclusion. the alleles hla-b27, hla-drb4*01 and hla-dqb1*0501 were common in the different subtypes of spondyloarthritis and were frequent in the specific clinical axial, peripheral and extraarticular clinical manifestations, as well as radiological sacroiliitis.
Virus del papiloma humano, respuesta inmune y cáncer cervical: una relación compleja
Rincón,Olga L; Pareja,Luis René; Jaramillo,Sergio; Aristizábal,Beatriz H;
Revista Colombiana de Obstetricia y Ginecología , 2007,
Abstract: cervical cancer is considered to be a serious public health problem having a high incidence in developing countries. high-risk cervical human papillomavirus (hpv) infection, permanence and replication are closely related to the development of cervical cancer. the immune system is able to control and clear such infection in normal conditions by innate immunity action, activating a cellular response and creating antibodies, mainly directed against virion capsid proteins (l1 and l2). in spite of the host?s entire immune protection machinery, the virus can take evasion strategies, maintaining a reduced number of copies in proliferating base cells and taking advantage of the keratinocyte?s short natural life. this review attempts to show the host?s different immunological mechanisms elicited in response to hpv infection.
Virus del papiloma humano, respuesta inmune y cáncer cervical: una relación compleja Human papillomavirus, immune response and cervical cancer: a complex relationship
Olga L Rincón,Luis René Pareja,Sergio Jaramillo,Beatriz H Aristizábal
Revista Colombiana de Obstetricia y Ginecología , 2007,
Abstract: El cáncer de cuello uterino se considera como un grave problema de salud pública con una alta incidencia en los países en desarrollo. La infección, permanencia y replicación del virus de papiloma humano (HPV, por sus siglas en inglés) de alto riesgo a nivel cervical están relacionadas con el desarrollo del cáncer de cuello uterino. En condiciones normales, el sistema inmune es capaz de controlar y eliminar la infección por acción de la inmunidad innata, la activación de una respuesta tipo celular y la creación de anticuerpos dirigidos principalmente a las proteínas de la cápside del virión (L1 y L2). A pesar de toda la maquinaria de protección inmune del hospedero, el virus posee estrategias de evasión, conservando un número reducido de copias en las células basales proliferantes y aprovechando la corta vida natural del queratinocito. En esta revisión se tratarán los diferentes mecanismos inmunológicos del hospedero en la respuesta a la infección por el HPV. Cervical cancer is considered to be a serious public health problem having a high incidence in developing countries. High-risk cervical human papillomavirus (HPV) infection, permanence and replication are closely related to the development of cervical cancer. The immune system is able to control and clear such infection in normal conditions by innate immunity action, activating a cellular response and creating antibodies, mainly directed against virion capsid proteins (L1 and L2). In spite of the host’s entire immune protection machinery, the virus can take evasion strategies, maintaining a reduced number of copies in proliferating base cells and taking advantage of the keratinocyte’s short natural life. This review attempts to show the host’s different immunological mechanisms elicited in response to HPV infection.
APLICACIóN DE UN MéTODO FLUOROMéTRICO PARA EVALUAR LA PROLIFERACIóN CELULAR EN LíNEAS CELULARES TUMORALES
Escobar M,Linamaría; Aristizábal G,Fabio A;
Vitae , 2010,
Abstract: assessment of in vitro cytotoxicity as a model to explore biological activity of compounds isolated from different sources is the first approached to search molecules with potential anticancer activity. this paper is about how to implement resazurin reduction method as an indirect indicator of cell survival. indeed both optimal resazurin concentration and incubation time were selected on mcf-7, mkn-45, siha, hep-2, ht-29 and hela. next, we compared survival results by using reduction method mtt and staining method srb defined as end-point tests, and resazurin method described as slightly toxic to cells. the comparison of the methods was done in terms of survival rate to evaluate the sensitivity of the lines to doxorubicin hcl, a medicine used in cancer. the methods were compared in terms of percentage survival by evaluating cell line sensitivity to doxorubicin hcl (a drug used in cancer treatment). the results show that resazurin reduction method used in 4.4 μm is applicable to detect significant changes in cell population exposed to cytotoxic molecules in routine testing.
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