oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 47 )

2019 ( 273 )

2018 ( 409 )

2017 ( 414 )

Custom range...

Search Results: 1 - 10 of 240135 matches for " Diana L. Burbano-Martínez "
All listed articles are free for downloading (OA Articles)
Page 1 /240135
Display every page Item
EFECTO DEL GRADIENTE ALTITUDINAL SOBRE ASPECTOS AUTOECOLóGICOS DE ESPELETIA PYCNOPHYLLA ssp. ANGELENSIS CUATREC. (ASTERACEAE) EN EL PáRAMO EL INFIERNILLO (NARI?O-COLOMBIA)
Benavides-Martínez,Iván F.; Burbano-Martínez,Diana L.; Urbano-Apráez,Sandra M.; Solarte-Cruz,María E.;
Actualidades Biológicas , 2007,
Abstract: some autoecological features of espeletia pycnophylla ssp. angelensis cuatrec. such as its demographic structure, population density, spatial pattern of dispersion, production of reproductive structures, adult morphometry and survivorship, were studied in an altitudinal gradient on a dry paramo of nari?o (colombia). hypothesis proposed by other authors about a linear effect caused by the elevation on these variables were completely rejected. the elevation induces an ecoclinal effect on population density, and this density correlates negatively with both production of reproductive structures and adult sizes. these results elucidate an unequivocal effect of density-dependence phenomena on population fitness. the intermediate zone of the altitudinal gradient exhibits a high population density, but on the other hand show reduced corporal adult sizes, minimal production of reproductive structures and the probability of juveniles reaching advanced ages is low. evidently, this intermediate elevation can have favorable ecological conditions for the seedling establishment, wich increments population densities at long term. we propose that other author's generalizations about the influence of elevation on the autoecology of these plants are limited, because the particular life and disturbance stories of paramos and the spatial, ecological and genetic isolating are explicative factors impossible to take away from the context. the demographic structure of the population fitted the logarithmic model, revealing its early regeneration state from the last fire event on 2003 and the similarity of the survivorship curves among every elevation, probed a high demographic stability.
EFECTO DEL GRADIENTE ALTITUDINAL SOBRE ASPECTOS AUTOECOLóGICOS DE ESPELETIA PYCNOPHYLLA ssp. ANGELENSIS CUATREC. (ASTERACEAE) EN EL PáRAMO EL INFIERNILLO (NARI O-COLOMBIA) THE EFFECT OF THE ALTITUDINAL GRADIENT ON AUTOECOLOGICAL FEATURES OF ESPELETIA PYCNOPHYLLA ssp. ANGELENSIS CUATREC. (ASTERACEAE) IN THE PARAMO 'EL INFIERNILLO' (NARI O-COLOMBIA)
Iván F. Benavides-Martínez,Diana L. Burbano-Martínez,Sandra M. Urbano-Apráez,María E. Solarte-Cruz
Actualidades Biológicas , 2007,
Abstract: Se estudió el efecto de la elevación sobre algunos aspectos autoecológicos de la especie Espeletia pycnophylla ssp. angelensis Cuatrec. (Asteraceae), tales como su estructura demográfica, densidad poblacional, patrón de distribución espacial, producción de estructuras reproductivas, morfometría de adultos y supervivencia, en un páramo seco del departamento de Nari o (Colombia). Las hipótesis propuestas por otros autores acerca del efecto lineal que la elevación produce sobre estas variables, fueron completamente rechazadas. La elevación induce un efecto coenoclínico sobre la densidad poblacional y ésta a su vez, se correlaciona negativamente con la producción de estructuras reproductivas y el tama o de los adultos, evidenciándose un efecto inequívoco del fenómeno de la densodependencia sobre el potencial biótico de la población. En la zona intermedia del gradiente, la densidad poblacional es máxima, pero los tama os corporales son reducidos, la producción de estructuras reproductivas es mínima y la probabilidad de que un juvenil alcance edades avanzadas es baja. Evidentemente, esta elevación intermedia estaría presentando condiciones ecológicas favorables para el establecimiento y supervivencia de plántulas, lo que a largo plazo conlleva a un aumento de la densidad poblacional. Se propone que las generalizaciones de otros autores acerca de la influencia de la elevación sobre la autoecología de estas plantas son inverosímiles y limitadas, ya que la historia particular de vida y disturbio del páramo y los aislamientos espaciales, ecológicos y genéticos, son factores explicativos que no pueden aislarse del contexto. Paralelamente, la población se ajustó al modelo demográfico logarítmico, revelando su temprano estado de regeneración frente a la última quema ocurrida en el 2003, y la similitud de las curvas de supervivencia entre todas las elevaciones, probó una alta estabilidad demográfica. Some autoecological features of Espeletia pycnophylla ssp. angelensis Cuatrec. such as its demographic structure, population density, spatial pattern of dispersion, production of reproductive structures, adult morphometry and survivorship, were studied in an altitudinal gradient on a dry paramo of Nari o (Colombia). Hypothesis proposed by other authors about a linear effect caused by the elevation on these variables were completely rejected. The elevation induces an ecoclinal effect on population density, and this density correlates negatively with both production of reproductive structures and adult sizes. These results elucidate an unequivocal effect of density-dependen
ENVASES ACTIVOS ANTIOXIDANTES Y SU EFECTO SOBRE LA CALIDAD SENSORIAL Y LOS COMPUESTOS VOLáTILES EN LECHE ENTERA DESHIDRATADA
SOTO V,Herlinda; PERALTA,Elizabeth; CANO H,Diana M; MARTíNEZ A,Olga L; GRANDA R,Diana M;
Vitae , 2011,
Abstract: milk flavor is highly related with its components, especially with fat content. factors such as light, packaging material and storage conditions can produce lipid oxidation and favor changes in the sensorial characteristics of product. the aim of this study was to evaluate the effect of active packaging with different antioxidants: butylated hydroxyanisole, butylated hydroxytoluene and α-tocopherol, on sensorial quality of whole milk powder. the panel members were trained to recognize the taste and smell of oxidized fat in milk and these results to be correlated with volatile compounds pentanal, heptanal and hexane quantified in milk samples using gas chromatography with solid phase microextraction. sensorial tests showed changes in oxidized fat flavor in milk. the general correlation of these data and volatiles concentration allowed finding a moderate but significant correlation between oxidized fat flavor and the pentanal, hexanal and heptanal volatiles. in general, the active packaging with α-tocopherol-butylated hidroxyanisole and α-tocopherol presented low score in oxidized fat flavor, representing a viable alternative for the conservation of sensorial properties in milk during storage time.
Enfermedad de Marburg como variante de esclerosis múltiple: presentación de un caso atípico
Carvajal,Tomas; Franco,Diana L; Martínez,Adriana; Pe?a,Iván M;
Acta Neurológica Colombiana , 2012,
Abstract: we present a 58 years old woman with multiple sclerosis diagnosed in 2007, she was treated with interferon and methylprednisolone with a stable disease until last year. recently she had had multiple episodes of exacerbations. patient was admitted for a rapidly progressive neurological deterioration. when evaluated the patient had a glasgow scale of 4/15 (best eye response: 2, best verbal response: 1, best motor response: 1). case was evaluated in a medical board, and was considered an atypical marburg variant of multiple sclerosis. she was treated with immunoglobulin and mitoxantrone without clinical improvement. later she developed a distributive shock leading to death.
Discrepancia entre los diagnósticos clínicos y por autopsia en un hospital pediátrico de tercer nivel
Richardson-López Collada, Vesta;Coronel-Martínez, Diana Leticia;
Boletín médico del Hospital Infantil de México , 2006,
Abstract: introduction. the autopsy has been recognized as a useful tool for medical education and for quality improvement, evaluating therapeutic and diagnostic measures. in the last 50 years, the autopsy rates have constantly declined. interestingly, between 1972 and 2002, the discrepancies between clinical diagnoses and autopsy findings haven't diminished, even with all the technological improvements now available. this research enables us to determine the discrepancy rate between our clinical diagnosis and autopsy results, as well as the main diseases that need diagnostic or therapeutic improvements in our hospital. our objectives were: 1. to obtain the discrepancy rate between clinical diagnoses and autopsy findings. 2. to determine the most frequent type of discrepancy, according with the goldman criteria, modified by battle, and 3. to evaluate the possible association of these discrepancies with the number of admissions, length of stay, patient's age and physician's age. material and methods. a retrospective, observational, comparative and transversal study. sample: all cases that had an autopsy between january 1st and december 31th 2004. cases with an incomplete record were excluded. the main variables analyzed were: age, gender, number of admissions and their length of stay, main clinical service, type of autopsy, main clinical and autopsy diagnoses and probable cause of death. results. in the year 2004 there were 209 deaths registered with 62 autopsies (29.7% rate). we found a discrepancy in the main clinical diagnosis in 15 cases (24.6%); and, according with the goldman criteria, modified by battle, we found a class i discrepancy in 5 cases (8.2%) and a class ii discrepancy in 4 cases (6.6%). we didn't find significant statistical differences in patients older than a year compared with patients less than 1 year old. there were no significant differences regarding the number of admissions and their length of stay, or variations the artendiag with the attending physi
Fisiopatología del síndrome de Guillain Barré axonal Physiopathology of axonal acute Guillain Barré syndrome
Beatriz Aguirre L.,Jaime Carrizosa Moog,Diana P. Martínez T.,Juan Guillermo Montoya Ch.
Iatreia , 2002,
Abstract: Se describe la fisiopatología del síndrome de Guillain Barré axonal. Se consideran especialmente cinco aspectos: 1) Agentes etiológicos, específicamente el Campylobacter jejuni. 2) Susceptibilidad genética humana. 3) Mimetismo molecular entre lipopolisacáridos y lipoproteínas. 4) Mecanismo de acción de los anticuerpos antigangliósidos y 5) Hallazgos patológicos. The physiopathology of axonal acute Guillain Barré syndrome is described. Five aspects are considered, namely: 1) Etiologic agents emphasizing on Campylobacter jejuni. 2) Human genetic predisposition. 3) Molecular mimicry between lipopolysaccharides and gangliosides. 4) Mechanisms of action of antiganglioside antibodies and, 5) Pathologic findings.
ENVASES ACTIVOS ANTIOXIDANTES Y SU EFECTO SOBRE LA CALIDAD SENSORIAL Y LOS COMPUESTOS VOLáTILES EN LECHE ENTERA DESHIDRATADA ANTIOXIDANT ACTIVE PACKAGING EFFECT WHOLE MILK POWDER SENSORIAL QUALITY AND PRODUCTION OF VOLATILE COMPOUNDS
Herlinda SOTO V,Elizabeth PERALTA,Diana M CANO H,Olga L MARTíNEZ A
Vitae , 2011,
Abstract: El sabor de la leche está estrechamente relacionado con su composición, especialmente con su contenido graso. Factores como la luz, los materiales de envase y las condiciones de almacenamiento pueden favorecer la oxidación de la grasa y alterar las características sensoriales del producto. El presente estudio buscó evaluar el efecto de los envases activos multicapa con diferentes antioxidantes en su capa más interna: butil hidroxitolueno, butil hidroxianisol, α-tocoferol y una mezcla de butil hidroxianisol-α-tocoferol, sobre la calidad sensorial de la leche entera deshidratada. El entrenamiento de un panel sensorial permitió la evaluación del atributo de sabor oxidado en la leche y la correlación de estos resultados con la producción de pentanal, hexanal y heptanal, cuantificados mediante cromatografía gaseosa usando microextracción en fase sólida. Los análisis sensoriales revelaron cambios en las características de sabor oxidado en las muestras de leche. La correlación general de estos datos y las concentraciones de volátiles cuantificadas permitieron encontrar una correlación moderada pero significativa entre el sabor oxidado y los volátiles pentanal, hexanal y heptanal. En general, los envases activos con butil hidroxianisol-α-tocoferol y α-tocoferol obtuvieron una menor calificaciσn en cuanto a su sabor oxidado y, en consecuencia, representan una alternativa viable para la conservación de las propiedades sensoriales de la leche. Milk flavor is highly related with ITS components, especially with fat content. Factors such as light, packaging material and storage conditions can produce lipid oxidation and favor changes in the sensorial characteristics of product. The aim of this study was to evaluate the effect of active packaging with different antioxidants: butylated hydroxyanisole, butylated hydroxytoluene and α-tocopherol, on sensorial quality of whole milk powder. The panel members were trained to recognize the taste and smell of oxidized fat in milk and these results to be correlated with volatile compounds pentanal, heptanal and hexane quantified in milk samples using gas chromatography with solid phase microextraction. Sensorial tests showed changes in oxidized fat flavor in milk. The general correlation of these data and volatiles concentration allowed finding a moderate but significant correlation between oxidized fat flavor and the pentanal, hexanal and heptanal volatiles. In general, the active packaging with α-tocopherol-butylated hidroxyanisole and α-tocopherol presented low score in oxidized fat flavor, representing a viable alternative
HPLC-ESI-IT-MS/MS Analysis and Biological Activity of Triterpene Glycosides from the Colombian Marine Sponge Ectyoplasia ferox
Jhonny Colorado-Ríos,Diana Mu?oz,Guillermo Montoya,Diana Márquez,Maria-Elena Márquez,Juan López,Alejandro Martínez
Marine Drugs , 2013, DOI: 10.3390/md11124815
Abstract: The marine sponge Ectyoplasia ferox produces antipredatory and allelopathic triterpenoid glycosides as part of its chemical defense repertoire against predators, competitors, and fouling organisms. These molecules are responsible for the pharmacological potential found in the glycosides present in this species. In order to observe the glycochemical diversity present in E. ferox, a liquid chromatography coupled to a tandem mass spectrometry approach to analyse a complex polar fraction of this marine sponge was performed. This gave valuable information for about twenty-five compounds three of which have been previously reported and another three which were found to be composed of known aglycones. Furthermore, a group of four urabosides, sharing two uncommon substitutions with carboxyl groups at C-4 on the terpenoid core, were identified by a characteristic fragmentation pattern. The oxidized aglycones present in this group of saponins can promote instability, making the purification process difficult. Cytotoxicity, cell cycle modulation, a cell cloning efficiency assay, as well as its hemolytic activity were evaluated. The cytotoxic activity was about IC 50 40 μg/mL on Jurkat and CHO-k 1 cell lines without exhibiting hemolysis. Discussion on this bioactivity suggests the scanning of other biological models would be worthwhile.
Estabilización del balón mediante estimulación cardíaca en la valvuloplastía aórtica
Sánchez, Agustín;David, Felipe;Velázquez, Enrique;Yá?ez, Lucelly;Jiménez, Santiago;Martínez, Arturo;Ortegón, José;López, Diana;Lascano, Sonia;Alva, Carlos;
Archivos de cardiología de México , 2005,
Abstract: objective: to evaluate rapid ventricular pacing in balloon aortic valvuloplasty, an initial strategy to achieve balloon stability. material and methods: from september to december 2004, a prospective protocol was started: three male consecutive patients with aortic valve stenosis were treated by this strategy. age of the patients were 13, 6 and 5 years old. all had a bipoplar pacing catheter placed in the right ventricle. invasive systemic pressures were documented with a catheter in the descending aorta. rapid ventricular pacing was initiated at the rate of 150 per minute and increased to a rate required to achieve a drop in systemic pressure by 50%. the balloon was inflated only after the pacing rate was reached and the blood pressure dropped. pacing was continued until the balloon was completely deflated. results: the systolic gradients across the aortic valve before balloon dilatation were 90, 110 and 55 mmhg. the systolic pressures in aorta were 90 and 110 mmhg. the pacing rate to drop the pressure by 50% were 170, 250 and 220 per minute. the pacing time was 15 seconds in all patients. balloon stability at time of inflation was achieved in all cases with no balloon movement. the post-ballooning gradients were 23, 28 and 15 mmhg. angiogram performed post balloon dilatation showed no change compared with the pre-balloning angiogram in aorta: trivial aortic incompetence in the first case and none in the second and third cases. conclusions: rapid ventricular pacing to stabilise the balloon during balloon aortic valvuloplasty seems to be safe and effective and may decrease the incidence of aortic incompetence.
Integración Asistencial de Dos Organizaciones en Catalu?a, Espa?a
Henao-Martínez,Diana; Vázquez-Navarrete,María L.; Vargas-Lorenzo,Ingrid; Coderch-Lassaletta,Jordi; Llopart-López,Josep R.;
Revista de Salud Pública , 2008, DOI: 10.1590/S0124-00642008000100004
Abstract: objective health policies aimed at promoting collaboration amongst providers have led to different initiatives, amongst them integrated healthcare delivery systems (ids); these have been analysed mainly in the usa but hardly so in colombia or spain . this article thus analyses the experience of two ids in catalonia for identifying elements for improvement. methods this was a case-study carried out via individual semi-structured interviews and analysing documents. two ids were selected; a sample of documents and reports providing information on analysis variables were selected for each case. content was analysed via mixed categories and segmentation by cases and topics. results both ids are health-care providing organisations presenting backward vertical integration, having total internal service production and virtual integration of ownership. bsa is funded by providing services whilst ssibe relies on shareholding via capitation pilot test. both have closely coordinated multiple managing bodies and have defined overall strategies orientated towards coordination and efficiency; they differ regarding implementation time. bsa has a divisional structure and ssibe a functional one, organised by transversal areas. clinical coordination is based on standardising processes and abilities, having few mechanisms for mutual adaptation and disparity in the number of instruments implemented. conclusions both organisations presented enabling and hindering factors for clinical coordination which would need changes in internal and external components in order to improve overall efficiency and health care continuity.
Page 1 /240135
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.